Attachment G-2-418-XO-IRD-0043_V_1_4.pdf

Effective Date: September 19, 2023 418-XO-IRD-0043 Responsible Organization: GeoXO Flight Project/Code 418 Baseline Version 1.4

To verify the correct version of this document, please contact the GeoXO Series Configuration Management Office.

Geostationary Extended Observations (GeoXO) SS to Ground Located Command, Control, & Communications

(SS-C3S) IRD

Signature page

Prepared by:

Electronically approved by:

01/21/2022

Thomas W. Kenney Date GeoXO Flight Project, Systems Engineer NASA GSFC, Code 418

Reviewed by:

02/03/2022

Steven W. Bidwell Date GeoXO Flight Project, Mission Systems Engineer NASA GSFC, Code 599

02/04/2022

Alexander Krimchansky Date GeoXO Program, Mission Systems Engineer NASA GSFC, Code 590

Electronically approved by: 01/25/2022 Kevin M. Mcmahon Date GeoXO Ground, Mission Systems Engineer NASA GSFC, Code 416

Approved by:

02/10/2022

Jason Hair Date GeoXO Flight Project, Project Manager NASA GSFC, Code 418

/GeoXO Flight Project Spacecraft

C3SIRD

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and Communications (SS-C3S) Interface Requirements Document (IRD)

Version: 1.4 Printed by: rkhoover Printed on: Monday, September 25, 2023

No filter applied.

No sort applied.

Generated from DOORS 9.7.2.4

Contents

1 1Introduction

1.1 1General GeoXO Description

1.1.1 1Mission Objectives

1.1.2 1Mission Description

1.2 2Ground Located - Command, Control, and Communications Segment (C3S) Scope

1.3 2Applicable Documents

1.4 3Requirements Terminology

2 4GL-C3S and Interface Description

2.1 5General C3S Interface Requirements

2.2 5On-station Coverage Requirements

2.3 5NTIA Compliance

2.4 5Power Flux Density Limits

2.5 5Reserved (CCR-X00162)

2.6 5Long Term Frequency Stability

2.7 5Short Term Frequency Stability

2.8 6Unwanted Emissions

2.9 6Spacecraft Intermodulation

2.10 6Simultaneous Operation of ORTT&C Functions and Command and Telemetry

2.11 6Error Free Ground Test Requirements (CCR-X00245)

2.12 7C3S Ground Antenna Axial Ratio and Polarization Isolation

2.13 7SFCG Spectrum Mask

3 8Spacecraft Raw Data Channel RF Interface

3.1 8General Raw Data Requirements

3.1.1 8Raw Data Requirements Summary

3.1.2 8Link Margin Requirement

3.1.3 8Downlink Atmospheric Loss

3.1.4 8Downlink Pointing Loss

3.1.5 9Raw Data Bit Error Rate

3.2 9Raw Data Transmit Downlink

3.2.1 9Downlink Center Frequency

3.2.2 9Raw Data Downlink Bandwidth

3.2.3 9Raw Data Downlink Modulation

3.2.4 9Raw Data Downlink EIRP

Project: GeoXO Flight Project Spacecraft Module: C3SIRD Baseline Version: 1.4

Contents ii

3.2.5 9Maximum Radiated Power toward Adjacent Spacecraft (CCR-X00219)

3.2.6 9Spacecraft Downlink Coverage

3.2.7 9Raw Data Link Polarization

3.2.8 9Raw Data Rates

3.2.9 9Raw Data Link Forward Error Correction Coding

3.2.10 10Data Randomization

3.2.11 10Raw Data Unwanted Emissions

3.2.12 10Phase Noise Requirement

3.2.13 11Raw Data Format

3.3 11Raw Data Downlink Receive Parameters

3.3.1 11Required Receive Eb/No.

3.3.2 11WCDAS and CBU Phase Noise

3.3.3 11RESERVED

4 12Housekeeping Telemetry Link Requirements

4.1 12Housekeeping Telemetry General Requirements

4.1.1 12Housekeeping Requirements Summary

4.1.2 12Link Margin Requirements

4.1.3 13Downlink Atmospheric Loss

4.1.4 13Downlink Pointing Loss

4.1.5 13Contingency Telemetry Antenna Coverage

4.1.6 13Telemetry Antenna Coverage for 4 and 100 ksps Links

4.1.7 13Housekeeping Telemetry Polarization

4.1.8 13Housekeeping Telemetry Bit Error Rate

4.2 13Housekeeping Telemetry Transmit RF Interface

4.2.1 13Downlink Center Frequency

4.2.2 13Telemetry Downlink EIRP

4.2.3 14Housekeeping Telemetry Rates

4.2.4 14Telemetry Forward Error Correction Coding

4.2.5 14Telemetry Data Randomization

4.2.6 14Telemetry Data Format

4.2.7 14Telemetry Modulation

4.2.8 14Telemetry Phase Noise Requirement

4.2.9 14Telemetry Switchable On-Off

4.3 14Telemetry Receive Parameters

4.3.1 14Required Receive Eb/No

4.3.2 15WCDAS and CBU Receive Phase Noise

5 16WCDAS/CBU Command Uplink Interface Requirements

Contents iii

5.1 16Command Uplink General Requirements

5.1.1 16Command Uplink Requirements Summary

5.1.2 16Link Margin Requirements

5.1.3 17Uplink Atmospheric Loss

5.1.4 17Uplink Pointing Loss

5.1.5 17Contingency Mode Command Receive Coverage

5.1.6 17WCDAS and CBU Command Uplink Bit Error Rate

5.2 17WCDAS and CBU Command Uplink Transmit Interface

5.2.1 17WCDAS and CBU Command Uplink EIRP

5.2.2 18WCDAS and CBU Command Uplink Polarization

5.2.3 18WCDAS and CBU Command Uplink Phase Noise

5.2.4 18WCDAS and CBU Command Uplink Frequency and Stability

5.3 18Spacecraft WCDAS and CBU Command Receive Requirements

5.3.1 18Spacecraft Command Receive G/T

5.3.2 18Spacecraft Command Receive Polarization

5.3.3 18Spacecraft Command Rates

5.3.4 18Spacecraft Error Detection Coding

5.3.5 18Spacecraft Command Data Randomization

5.3.6 19Spacecraft Command Data Format

5.3.7 19Spacecraft Command Data Modulation

5.3.8 19DELETED

5.3.9 19Spacecraft Receive Dynamic Range

5.3.10 19Command Receiver Not On-Off Switchable

5.3.11 19System Protection

6 21Orbit Raising, Tracking, Telemetry, and Command (ORTT&C) Requirements

6.1 21ORTT&C General Command, Telemetry, and Tracking Parameters

6.1.1 21ORTT&C Antenna Coverage

6.1.2 21ORTT&C Polarization and Coverage

6.1.3 21ORTT&C Modulation Indexes

6.1.4 22NEN and DSN Compatible

6.1.5 22ORTT&C Command Link Requirements for Ground and Spacecraft

6.1.6 22Command Link Margin Requirement

6.1.7 23Uplink Atmospheric Loss

6.1.8 23Uplink Pointing Loss

6.2 23ORTT&C Uplink Command Parameters

6.2.1 23ORTT&C Uplink Frequency and Stability

6.2.2 23ORTT&C Uplink EIRP

Contents iv

6.2.3 23ORTT&C Phase Noise Requirement

6.3 23ORTT&C Command Receive Requirements

6.3.1 23ORTT&C Command Receive G/T

6.3.2 24ORTT&C Uplink Command Modulation

6.3.3 24ORTT&C Uplink Command Rates

6.3.4 24ORTT&C Uplink Coding

6.3.5 24ORTT&C Command Data Randomization

6.3.6 24Command Data Format

6.3.7 24ORTT&C Uplink BER Requirements

6.3.8 24DELETED

6.3.9 24ORTT&C Receiver Not On-Off Switchable

6.3.10 24System Protection

6.4 25ORTT&C Spacecraft Downlink Telemetry Requirements

6.4.1 26ORTT&C Downlink Frequency and Coherence Modes

6.4.2 26ORTT&C Telemetry Switchable Off-On

6.4.3 26ORTT&C Downlink Data Modulation

6.4.4 27ORTT&C Telemetry Phase Noise Requirement

6.4.5 27Link Margin Requirement

6.4.6 27Downlink Atmospheric Loss

6.4.7 27Downlink Pointing Loss

6.4.8 27ORTT&C Downlink BER Requirements

6.4.9 27ORTT&C Downlink Telemetry Rates

6.4.10 28ORTT&C Telemetry Forward Error Correction Coding

6.4.11 28ORTT&C Telemetry Data Randomization

6.5 28ORTT&C Ground Station Telemetry Receive Parameters

6.5.1 28ORTT&C Ground Receive G/T and Spacecraft EIRP

6.5.2 28Required Receive Eb/No

6.5.3 28ORTT&C Ground Receive Phase Noise Requirement

6.6 28ORTT&C Tracking Link Requirements

6.6.1 28ORTT&C Tracking Link Description

6.6.2 29ORTT&C Tracking Channel ON and OFF

6.6.3 29Switching Between the Coherent and Non-coherent Modes

6.6.4 29ORTT&C Simultaneous Command, Telemetry, and Tracking

6.6.5 29ORTT&C Coherency State for Contingency

6.6.6 29ORTT&C Tracking Bandwidth

6.6.7 29The ORTT&C Downlink C/No

7 30Abbreviations and Acronyms

Contents v

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ID

C3SIRD1

C3SIRD2

C3SIRD3

C3SIRD4

C3SIRD5

C3SIRD6

C3SIRD7

C3SIRD8

C3SIRD9

Object Number

1.1

1.1.1

1.1.1.0-1

1.1.2

1.1.2.0-1

1.1.2.0-2

1.1.2.0-3

1.1.2.0-4

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

1 Introduction

1.1 General GeoXO Description

1.1.1 Mission Objectives

Primary Mission Objectives:

a) To maintain GeoXO mission continuity and quality in environmental observations in the 2030-2050 timeframe

b) To provide enhanced environmental data products

c) To improve services and data being provided to Users

d) To be responsive to technology infusion to meet evolving User needs

1.1.2 Mission Description

The mission of the GeoXO System will be to acquire and disseminate environmental data from a near-equatorial Earth orbit at geosynchronous altitude (i.e., a geostationary orbit). This includes the Earth's surface and atmosphere. The major functions of the GeoXO System are to support the Imager (GXI), Lightning Mapper (LMX), Infrared Sounder (GXS), Atmospheric Composition (ACX), Ocean Color (OCX). Another function of the GeoXO System is to support terrestrial and oceanographic Data Collection Platforms (DCPs).

The GeoXO satellite will be launched from Cape Canaveral, FL. The government will be responsible for all ground networks, and communications required for performing the launch and orbit raising activities. All launch and orbit raising activities will be performed from the NOAA Satellite Operations Facility (NSOF) in Suitland, MD. Once geostationary orbit is achieved, all activities will be performed using the Wallops Command and Data Acquisition Station (WCDAS) at Wallops, Virginia as the primary ground station and a Consolidated Backup (CBU) facility at Fairmont, West Virginia.

The GeoXO operational constellation will provide coverage from three locations, one at approximately 75° west longitude and the second at 105° west and the third at approximately 137° west longitude. One or two satellites may be maintained as on orbit spares positioned at approximately 92° west or 94° west longitude. Post launch test and checkout activities will nominally be conducted at 88° west longitude. The satellites may be operated anywhere between 5° west and 148° west. During the transition to the GeoXO satellite series, the operational constellation may contain GOES-R satellites and incumbent satellites that have not yet been de-orbited.

The satellites will be commanded throughout their mission lifetime from the NOAA Satellite Operations Control Center (SOCC) located at NSOF with the ground station radio frequency (RF) interface located at the WCDAS or the CBU. The satellite health and safety telemetry streams are received by the WCDAS/CBU and ground relayed to the SOCC for processing and monitoring. The raw sensor data will be received by the WCDAS/CBU, processed, and distributed via the NESDIS Common Cloud Framework.

The WCDAS/CBU also receives all data collection platform reports automatically through the Data Collection Platform Reports (DCPR) transponder.

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ID

C3SIRD10

C3SIRD11

C3SIRD12

C3SIRD13

C3SIRD14

Object Number

1.2

1.2.0-1

1.2.0-2

1.3

1.3.0-1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

1.2 Ground Located - Command, Control, and Communications

Segment (C3S) Scope

The interface supports the communication of data between the SS and the ground located command, control, and communications segment (GL-C3S). Consequently, this Interface Requirements Document (IRD):

a) Identifies required command, control, and communications (C3S) links from the Spacecraft to the GL-C3S

b) Establishes functional and performance requirements related to these communication links.

The GeoXO system interfaces included in this document are for the RF interfaces between the GeoXO Spacecraft and Ground Support Equipment elements of the GL-C3 Segment, including support provided by the launch network ground stations. The communication link interfaces between the GeoXO Spacecraft and the Data Collection System (DCS) auxiliary communication (transponder) service are found in the associated

IRD.

1.3 Applicable Documents

The following documents form a part of the requirements to the extent referenced herein.

1. Manual of Regulations and Procedures for Federal Radio Frequency Management, National Telecommunications and Information Administration, (NTIA), January 2021 Edition.

2. ITU Limits for power flux density from space stations, ITU Radio Regulations, Chapter VI, Article 21, Section 5, 2020 Edition.

3. DELETED

4. DELETED

5. Recommendation for Space Data Systems Standards TM Synchronization and Channel Coding, Blue Book, CCSDS 131.0-B-4, April 2022.

6. Recommendation for Space Data Systems Standards TC Synchronization And Channel Coding, Blue Book, CCSDS 231.0-B-4, July 2021.

7. Radio Frequency and Modulation Systems-Part1: Earth Stations and Spacecraft, Blue Book, CCSDS 401.0-B-31, February 2021.

8. Protection Criteria for Deep-Space Research, Recommendation ITU-R SA.1157-1, January 1, 2006.

9. DELETED

10. DSN Telecommunications Link Design Handbook, 810-005, Rev E, subsection 203, Rev. D Sequential Ranging, February 5, 2021.

11. Near Earth Network (NEN) Users’ Guide, 453-NENUG Rev 5, September 16, 2020.

12. Space System Protection Standard, NASA-STD-1006, Baseline, October 29, 2019.

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ID

C3SIRD14

C3SIRD15

C3SIRD16

Object Number

1.3.0-1

1.4

1.4.0-1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

13. SFCG Efficient Spectrum Utilisation for Space Research Service (Category A) and Earth Exploration-Satellite Service on Space-to-Earth links, Recommendation SFCG 21-2R4, August 4, 2015.

14. Security Requirements for Cryptographic Modules, NIST.FIPS.140-3, March 22, 2019.

15. Recommendation for Block Cipher Modes of Operation, NIST SP 800-38D, November 2007.

16. Advanced Encryption Standard (AES), NIST FIPS 197, November 26, 2001.

(CCR-X00162) (CCR-X00186)

1.4 Requirements Terminology

The following requirements terminology is used throughout this document:

The use of “shall” designates a requirement that must be met.

The use of “will” designates a statement of fact or intention of the government.

The use of “may” designates that permission has been granted by the government.

The term “(TBD)” means, “to be determined” and is used when no value is available with subsequent study needed to obtain it.

The term “(TBR)” means “to be refined/reviewed” for a value that is subject to review for appropriateness and is subject to revision. The vendor is liable for compliance with the information marked “TBR” as if the “TBR” notation did not exist.

The “Spacecraft contractor’s ICD” is synonymous with the RF Spacecraft to ground ICD.

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ID

C3SIRD17

C3SIRD18

C3SIRD19

C3SIRD20

C3SIRD21

Object Number

2.0-1

2.0-2

2.0-3

2.0-4

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

2 GL-C3S and Interface Description The GeoXO Space Segment to GL-C3S interfaces described in this IRD are for the RF interfaces between the Spacecraft and the WCDAS and CBU for the:

Spacecraft Raw Data Channel Downlink which multiplexes all GeoXO instrument data and telemetry (telemetry is duplicated from the telemetry link), and is described in section 3, Housekeeping Telemetry Data Link, described in section 4, and Command Data Link, described in section 5.

Orbit Raising, Tracking, Telemetry, and Command (ORTT&C) providers such as the NASA Deep Space Network (DSN), NASA [Near Space Network (NSN), Near Earth Network (NEN)], and Swedish Space Corporation (SSC) Space U.S. (formerly known as the Universal Space Network (USN)) provide the support during the launch and orbit raising mission phases. The WCDAS/CBU support the on-station and storage mission phases. The performance, functional and interface requirements required to support the ORTT&C links are described in section 6.

For reference the CDAS are located at:

WCDAS:

Latitude: 37 degrees, 56 minutes, 43.7 seconds, north Longitude: 75 degrees, 27 minutes, 41.8 seconds, west

CBU:

Latitude: 39 degrees, 26 minutes, 1.1 seconds, north Longitude: 80 degrees, 11 minutes, 36.0 seconds, west

The contingency mode referred to in this IRD is the same as the Spacecraft safe hold mode.

The housekeeping telemetry referred to in this IRD is the same as CDA telemetry. (CCR- X00186)

Information Rate (IB) The number of bits into the encoder or the number of bits out of the decoder, given in units of bits per second (bps) in a CCSDS transfer frame with Communications Link Transmission Unit overhead.

Transmission Bit Rate (TB) The number of bits transmitted in a given time frame, given in bits per second.

Overhead Rate (OR) The number of bits required to encode and synchronize the information bits at the baseband level in a given time frame prior to modulation or after demodulation. This includes, but is not limited to, bits required to implement encoding, synchronization, and any other additional bits inserted after encoding. The TB, IB, and OR are related by:

TB = IB + OR

Transmission Rate (TS) The transmission rate is the rate of symbols used in the modulation scheme employed

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ID

C3SIRD21

C3SIRD22

C3SIRD23

C3SIRD24

C3SIRD25

C3SIRD26

C3SIRD27

C3SIRD28

C3SIRD29

C3SIRD30

C3SIRD31

C3SIRD32

C3SIRD33

C3SIRD34

C3SIRD35

C3SIRD36

Object Number

2.0-4

2.1

2.1.0-1

2.1.0-2

2.2

2.2.0-1

2.3

2.3.0-1

2.4

2.4.0-1

2.5

2.5.0-1

2.6

2.6.0-1

2.7

2.7.0-1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD) for transmission of the bits and is given in symbols per second (sps).

Bits to Symbol Ratio (BSR) The ratio of bits to symbols. For Binary Phase Shift Keying (BPSK) modulation the BSR is 1 bit per symbol. For Offset Quadrature Phase Shift Keying (OQPSK) the BSR is 2 bits per symbol. The TS, TB, and BSR are related by the following equation:

TS = TB / BSR

2.1 General C3S Interface Requirements

Communications Standards will be compatible with the Consultative Committee for Space Data Systems (CCSDS) recommendations, in particular frame markers and frame headers, to the extent that they can be applied without conflict with other requirements of this document.

All C3S links shall simultaneously meet all of their requirements under worst case operational conditions over the life of the satellite, at edge of coverage, and over the full dynamic uplink power range and with DCS operational.

2.2 On-station Coverage Requirements

The on-station Spacecraft performance requirements shall be met for all links to and from the primary WCDAS and CBU stations located at the Wallops, Virginia and at Fairmont, West Virginia respectively.

2.3 NTIA Compliance

The C3S links shall comply with all NTIA requirements for geostationary Spacecraft operating at L-, S-, and X-band frequencies [Applicable Document 1].

2.4 Power Flux Density Limits

The downlink PFD values for the C3S links shall conform to the ITU regulations RR-21 section 5[Applicable Document 2] and be incorporated into the Spacecraft contractor's Interface Control Document (ICD).

2.5 Reserved (CCR-X00162)

Reserved (CCR-X00162)

2.6 Long Term Frequency Stability

The C3S downlink frequency changes due to the satellite shall be less than 1x10-7 for the Raw Data link, 20x10-6 for the ORTT&C telemetry link, and less than 1x10-7 for the housekeeping telemetry link under all conditions over the life of the satellite.

2.7 Short Term Frequency Stability

The C3S short term frequency changes due to the Spacecraft shall be less than 1x10-11 for one second and 1x10-10 for ten seconds for the Raw Data link; less than 5x10-10 for one second and 5x10-9 for ten seconds for the ORTT&C telemetry link; and less than 1x10-11 for one second and 1x10-10 for ten seconds for the housekeeping telemetry link.

Page 8 of 31 Printed Monday, September 25, 2023

ID

C3SIRD50

C3SIRD51

C3SIRD52

C3SIRD53

C3SIRD54

C3SIRD55

C3SIRD56

C3SIRD57

C3SIRD58

C3SIRD59

C3SIRD60

C3SIRD61

Object Number

3.1

3.1.0-1

3.1.1

3.1.1.0-1

3.1.2

3.1.2.0-1

3.1.3

3.1.3.0-1

3.1.4

3.1.4.0-1

3.1.4.0-2

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

3 Spacecraft Raw Data Channel RF Interface

3.1 General Raw Data Requirements

The Raw Data link is a primary data link that includes all the multiplexed data from the instruments and telemetry to the NOAA data acquisition sites.

3.1.1 Raw Data Requirements Summary

The Raw Data link requirements are summarized in Table C3SIRD54.

Table C3SIRD54: Raw Data Summary Link Requirements Spacecraft Transmit Requirement

Frequency Band 8210 TBR MHz Freq Band: 8025- 8400 MHz

EIRP Contractor specified (dBm)

Antenna coverage to WCDAS and CBU Polarization Linear N-S Bandwidth 350 MHz

Information data rate 340 Mbps Note (389 Msps coded symbol rate*(7/8))

FEC code Rate 7/8 LDPC Modulation OQPSK Raw Data Format NRZ-L Coded BER 1x 10-12

Ground Receive Minimum Receive G/T 35 dB/K Polarization Linear N-S

(CCR-X00162)

3.1.2 Link Margin Requirement

A link margin of 1 dB for elevation angles 10 deg, and 3 dB for elevation angles > 10 deg over the life of the satellite and over the coverage region shall be required.

(CCR-X00186)

3.1.3 Downlink Atmospheric Loss

The Spacecraft shall meet all of its performance requirements with a downlink atmospheric attenuation loss of 12.0 dB (based on 99.99% one-way annual availability including scintillation at 6 deg elevation).

3.1.4 Downlink Pointing Loss

The Spacecraft shall meet all of its performance requirements with a pointing loss of

1.0 dB for the WCDAS and CBU receive antennas.

The satellite transmit pointing loss will be determined by the contractor and incorporated into the Spacecraft contractor's ICD.

Page 9 of 31 Printed Monday, September 25, 2023

ID

C3SIRD62

C3SIRD63

C3SIRD64

C3SIRD65

C3SIRD66

C3SIRD67

C3SIRD68

C3SIRD69

C3SIRD70

C3SIRD71

C3SIRD72

C3SIRD73

C3SIRD74

C3SIRD320

C3SIRD75

C3SIRD76

C3SIRD77

C3SIRD78

C3SIRD79

C3SIRD80

C3SIRD81

C3SIRD82

Object Number

3.1.5

3.1.5.0-1

3.2

3.2.1

3.2.1.0-1

3.2.2

3.2.2.0-1

3.2.3

3.2.3.0-1

3.2.4

3.2.4.0-1

3.2.4.0-2

3.2.5

3.2.5.0-1

3.2.6

3.2.6.0-1

3.2.7

3.2.7.0-1

3.2.8

3.2.8.0-1

3.2.8.0-2

3.2.9

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

3.1.5 Raw Data Bit Error Rate

The coded BER (bit error rate) at the minimum Eb/No shall be less than 10-12.

3.2 Raw Data Transmit Downlink

3.2.1 Downlink Center Frequency

The Spacecraft shall meet all of its performance requirements when transmitting to WCDAS and CBU receivers with a center frequency of 8210 TBR MHz.

3.2.2 Raw Data Downlink Bandwidth

The Spacecraft Raw Data downlink bandwidth shall be no more than 350 MHz. (CCR- X00162)

3.2.3 Raw Data Downlink Modulation

The Spacecraft Raw Data downlink modulation shall be OQPSK.

3.2.4 Raw Data Downlink EIRP

The Spacecraft shall meet all of its performance requirements when transmitting to WCDAS and CBU antennas with a clear sky G/T (at 5° elevation angle) as low as 35.0 dB/K.

The EIRP required for this will be determined by the contractor and incorporated into the Spacecraft contractor's ICD.

3.2.5 Maximum Radiated Power toward Adjacent Spacecraft

(CCR-X00219)

The Spacecraft X-band communications shall have less than -60 dB W/Hz of Raw Data spectral power density over an off-axis 5o half-angle cone in the direction of adjacent geosynchronous satellites in the 135o ± 0.3o West longitude slot. (CCR-X00219)

3.2.6 Spacecraft Downlink Coverage

The GeoXO Spacecraft shall meet its performance requirements when transmitting to the WCDAS and CBU.

3.2.7 Raw Data Link Polarization

The Raw Data link shall meet all of its performance requirements when transmitting to WCDAS and CBU antennas with switchable linear polarization aligned to a satellite with linear N-S polarization.

3.2.8 Raw Data Rates

The Raw Data link information rate shall be 340 Mbps.

The transmission rate, Ts, shall be 389 Coded Msps.

3.2.9 Raw Data Link Forward Error Correction Coding

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ID

C3SIRD83

C3SIRD84

C3SIRD85

C3SIRD86

C3SIRD87

C3SIRD88

C3SIRD89

Object Number

3.2.9.0-1

3.2.9.0-2

3.2.10

3.2.10.0-1

3.2.11

3.2.11.0-1

3.2.12

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

Transfer frames shall use the Low-Density Parity-Check Coding format for the Raw Data downlink as described in CCSDS 131.0-B-4 sections 7 and 8 [Applicable Document 5].

Note: The code blocks do not need to align with the transfer frames since high data rate transfer frames are generally longer than the codeword message size. (CCR-X00162)

The Raw Data shall be processed as shown below and formatted according to CCSDS 131.0-B-4 [Applicable Document 5]. (CCR-X00162)

3.2.10 Data Randomization

The Raw Data shall be randomized using a Pseudo-Random Noise sequence described in CCSDS 131.0-B-4 [Applicable Document 5]. (CCR-X00162)

3.2.11 Raw Data Unwanted Emissions

The spectral power flux density in the Raw Data downlink in the 8.40 GHz to 8.45 GHz band shall comply with the Recommendation of ITU-R SA.1157-1, Table 5 Protection criteria for deep-space research [Applicable Document 8].

3.2.12 Phase Noise Requirement

Page 11 of 31 Printed Monday, September 25, 2023

ID

C3SIRD90

C3SIRD91

C3SIRD92

C3SIRD93

C3SIRD94

C3SIRD95

C3SIRD96

C3SIRD97

C3SIRD98

C3SIRD99

Object Number

3.2.12.0-1

3.2.13

3.2.13.0-1

3.3

3.3.0-1

3.3.1

3.3.1.0-1

3.3.2

3.3.2.0-1

3.3.3

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

The Raw Data downlink shall have a phase noise of less than 2° RMS when measured from 10 kHz to the modulation symbol rate.

3.2.13 Raw Data Format

The Spacecraft shall meet all of its performance requirements for a Raw Data downlink transmitting with NRZ-L format as required by the LDPC code.

3.3 Raw Data Downlink Receive Parameters

The Raw Data will be received at WCDAS and the CBU.

3.3.1 Required Receive Eb/No.

The Spacecraft shall meet all of its performance requirements when transmitting to a Raw Data receiver which requires an Eb/No of 6.7 dB (including 2.3 dB ground implementation loss but not including Spacecraft implementation loss) to achieve the required BER.

3.3.2 WCDAS and CBU Phase Noise

The Spacecraft shall meet all of its performance requirements when transmitting to WCDAS and CBU receivers with less than 2° RMS of phase noise when integrated from 1 kHz to a frequency equal to the modulation symbol rate.

3.3.3 RESERVED

Page 12 of 31 Printed Monday, September 25, 2023

ID

C3SIRD100

C3SIRD101

C3SIRD102

C3SIRD103

C3SIRD104

C3SIRD105

C3SIRD106

Object Number

4.0-1

4.1

4.1.1

4.1.1.0-1

4.1.2

4.1.2.0-1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

4 Housekeeping Telemetry Link Requirements This section describes the operational, storage, and contingency housekeeping telemetry link requirements during on-station and storage mission phases for normal and contingency modes. The housekeeping telemetry downlink will consist of Spacecraft and instrument engineering data, health and safety information, and command receipt verification.

4.1 Housekeeping Telemetry General Requirements

4.1.1 Housekeeping Requirements Summary

The housekeeping telemetry link requirements are summarized in Table C3SIRD104.

Table C3SIRD104: Housekeeping Telemetry Summary Link Requirements Spacecraft Transmit Requirement

Center frequency 1692.7 TBR MHz BW = 200kHz

EIRP Contractor specified (dBm)

Polarization Contractor specified Telemetry low transmission rate (symbol rate including coding)

4 ksps

Telemetry low information rate (bit rate prior to coding)

3.4375 kbps

Telemetry high transmission rate (symbol rate including coding)

100 ksps

Telemetry high information rate (bit rate prior to coding)

85.9375 kbps

Format NRZ-M Modulation BPSK Coding Reed-Solomon block code

(252,220) with I=1 Antenna coverage To WCDAS and RBU Coded BER 1x10-7

Ground Receive Polarization (G/T) Minimum Receive G/T (On-station and Storage Mission Phases; Normal and Contingency Modes)

RHCP (TBR)

26 dB/K

4.1.2 Link Margin Requirements

The Spacecraft shall meet all of its housekeeping telemetry requirements with the link margins specified in Table C3SIRD106 for the transmission rates shown, over the life of the satellite and over the coverage region.

Page 13 of 31 Printed Monday, September 25, 2023

ID

C3SIRD106

C3SIRD107

C3SIRD108

C3SIRD109

C3SIRD110

C3SIRD111

C3SIRD112

C3SIRD113

C3SIRD114

C3SIRD115

C3SIRD116

C3SIRD117

C3SIRD118

C3SIRD119

C3SIRD120

C3SIRD121

C3SIRD122

C3SIRD123

Object Number

4.1.2.0-1

4.1.3

4.1.3.0-1

4.1.4

4.1.4.0-1

4.1.4.0-2

4.1.5

4.1.5.0-1

4.1.6

4.1.6.0-1

4.1.7

4.1.7.0-1

4.1.8

4.1.8.0-1

4.2

4.2.1

4.2.1.0-1

4.2.2

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

Table C3SIRD106: Housekeeping Telemetry Minimum Margin Requirements

Modes On-Station Phase Storage Phase

Normal 4 ksps 6 dB 3 dB Normal 100 ksps 3 dB 3 dB

Contingency 4 ksps 2 dB 2 dB

(CCR-X00186)

4.1.3 Downlink Atmospheric Loss

The Spacecraft shall meet all of its performance requirements with a downlink atmospheric attenuation loss of 2.0 dB (based on 99.99% one way annual availability including scintillation).

4.1.4 Downlink Pointing Loss

The Spacecraft shall meet all of its performance requirements with a pointing loss of

0.5 dB for the ground antenna.

The satellite transmit pointing loss will be determined by the contractor and incorporated into the Spacecraft contractor's ICD.

4.1.5 Contingency Telemetry Antenna Coverage

In the contingency mode the housekeeping telemetry link shall provide continuous coverage over greater than 95 % of the 4 pi steradians for transmissions from the Spacecraft.

4.1.6 Telemetry Antenna Coverage for 4 and 100 ksps Links

The housekeeping telemetry downlink coverage for both 4 and 100 ksps links shall include the WCDAS and CBU.

4.1.7 Housekeeping Telemetry Polarization

The Spacecraft housekeeping telemetry polarization shall be RHCP TBR and incorporated into the Spacecraft contractor's ICD.

4.1.8 Housekeeping Telemetry Bit Error Rate

The BER (bit error rate) at the minimum Eb/No shall be less than or equal to 10-7 for the 3.4375 kbps and the 85.9375 kbps telemetry information rates.

4.2 Housekeeping Telemetry Transmit RF Interface

4.2.1 Downlink Center Frequency

The downlink center frequency for the housekeeping telemetry shall be 1692.7 TBR MHz.

4.2.2 Telemetry Downlink EIRP

Page 14 of 31 Printed Monday, September 25, 2023

ID

C3SIRD124

C3SIRD125

C3SIRD126

C3SIRD127

C3SIRD128

C3SIRD129

C3SIRD130

C3SIRD131

C3SIRD132

C3SIRD133

C3SIRD134

C3SIRD135

C3SIRD136

C3SIRD137

C3SIRD138

C3SIRD139

C3SIRD140

C3SIRD141

C3SIRD142

C3SIRD143

Object Number

4.2.2.0-1

4.2.2.0-2

4.2.3

4.2.3.0-1

4.2.3.0-2

4.2.4

4.2.4.0-1

4.2.5

4.2.5.0-1

4.2.6

4.2.6.0-1

4.2.7

4.2.7.0-1

4.2.8

4.2.8.0-1

4.2.9

4.2.9.0-1

4.3

4.3.1

4.3.1.0-1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

The Spacecraft shall meet all of its performance requirements when transmitting to ground antennas with a clear sky G/T (at 5° elevation angle) of 26.0 dB/K or greater.

The EIRP required for this will be determined by the contractor and incorporated into the Spacecraft contractor's ICD.

4.2.3 Housekeeping Telemetry Rates

The housekeeping telemetry rate shall be selectable by ground command to be either low transmission rate 4 ksps (symbol rate including coding) corresponding to low information rate 3.4375 kbps (bit rate prior to coding) or high transmission rate 100 ksps (symbol rate including coding) corresponding to high information rate 85.9375 kbps (bit rate prior to coding).

The coded housekeeping telemetry transmission rate shall be 4 ksps for the contingency mode.

4.2.4 Telemetry Forward Error Correction Coding

The Forward Error Correction (FEC) code for the 4 and 100 ksps telemetry links shall be a Reed-Solomon Code (255, 223) shortened according to CCSDS recommendations by 3 bytes to (252, 220), with an interleave depth of 1 for the telemetry link as defined by Section 4.3 and 8.4 in CCSDS 131.0-B-4 [Applicable Document 5]. (CCR-X00162)

4.2.5 Telemetry Data Randomization

The telemetry data link shall be randomized using a PRN sequence described in CCSDS 131.0-B-4 [Applicable Document 5]. (CCR-X00162)

4.2.6 Telemetry Data Format

The telemetry data format shall be NRZ-M.

4.2.7 Telemetry Modulation

The telemetry modulation for the 4 and 100 ksps links shall be BPSK.

4.2.8 Telemetry Phase Noise Requirement

The downlink telemetry signal shall have a phase noise of less than 5.0 RMS when integrated from 30 Hz to greater than 100 kHz.

4.2.9 Telemetry Switchable On-Off

The telemetry downlink shall be switchable on and off by ground command.

4.3 Telemetry Receive Parameters

4.3.1 Required Receive Eb/No

The Spacecraft shall meet all of its performance requirements when transmitting to a telemetry receiver which requires an Eb/No of 9.0 dB (including 2.3 dB ground implementation loss but not including Spacecraft implementation loss) to achieve the required BER.

Page 15 of 31 Printed Monday, September 25, 2023

ID

C3SIRD144

C3SIRD145

Object Number

4.3.2

4.3.2.0-1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

4.3.2 WCDAS and CBU Receive Phase Noise

The Spacecraft shall meet all of its performance requirements when transmitting to WCDAS and CBU receivers with less than 1.5° RMS of phase noise when integrated from 10 Hz to a frequency equal to the modulation symbol rate.

Page 16 of 31 Printed Monday, September 25, 2023

ID

C3SIRD146

C3SIRD147

C3SIRD148

C3SIRD149

C3SIRD150

Object Number

5.1

5.1.1

5.1.1.0-1

5.1.2

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

5 WCDAS/CBU Command Uplink Interface Requirements

5.1 Command Uplink General Requirements

5.1.1 Command Uplink Requirements Summary

The WCDAS/CBU Command Uplink data link requirements are summarized in Table

C3SIRD149.

Table C3SIRD149: WCDAS/CBU Command Uplink Summary Link Requirements

WCDAS/CBU Uplink Transmit

Requirement

Center frequency 2034.200 MHz Freq Plan: BW = 128 kHz

EIRP

Contingency mode Normal mode

105 dBm 88 dBm at 4 ksps 95 dBm at 64 ksps

Polarization Normal and Contingency modes

RHCP

Command Low Transmission Rate (symbol rate including coding)

4 ksps

Command Low Information Rate (bit rate prior to coding)

3.50 kbps

Command High Transmission Rate (symbol rate including coding)

64 ksps

Command High Information Rate (bit rate prior to coding)

56.00 kbps

Modulation BPSK Coding BCH Format NRZ-M

Spacecraft Receive Receive G/T Contractor specified (dB/K) Polarization Contractor specified

BER

5.1.2 Link Margin Requirements

Page 17 of 31 Printed Monday, September 25, 2023

ID

C3SIRD151

C3SIRD152

C3SIRD153

C3SIRD154

C3SIRD155

C3SIRD156

C3SIRD157

C3SIRD158

C3SIRD159

C3SIRD160

C3SIRD161

C3SIRD162

C3SIRD163

Object Number

5.1.2.0-1

5.1.3

5.1.3.0-1

5.1.4

5.1.4.0-1

5.1.4.0-2

5.1.5

5.1.5.0-1

5.1.6

5.1.6.0-1

5.2

5.2.1

5.2.1.0-1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

The Spacecraft shall meet all of its CDAS/CBU command requirements with the link margins specified in Table C3SIRD151 for the transmission rates shown, over the life of the satellite and over the coverage region.

Table C3SIRD151: WCDAS/RBU Command Minimum Margin Requirements

Modes On-Station Phase Storage Phase Normal 4 ksps 6 dB 2 dB Normal 64 ksps 2 dB N/A

Contingency 4 ksps 2 dB 2 dB

(CCR-X00186)

5.1.3 Uplink Atmospheric Loss

The Spacecraft shall meet all of its performance requirements with an uplink atmospheric attenuation loss of 2.5 dB (based on 99.99% one-way annual availability including scintillation).

5.1.4 Uplink Pointing Loss

The Spacecraft shall meet all of its performance requirements with a pointing loss of

0.5 dB for the WCDAS and CBU transmit antennas.

The satellite receive pointing loss will be determined by the contractor and incorporated into the Spacecraft contractor's ICD.

5.1.5 Contingency Mode Command Receive Coverage

The Spacecraft S-band antennas for the contingency mode command receive links shall provide continuous coverage over greater than 95 % of the 4 pi steradians angle for transmissions to the Spacecraft.

5.1.6 WCDAS and CBU Command Uplink Bit Error Rate

The BER (bit error rate) after decoding shall be 10-5 for the 3.50 and 56.00 kbps command rates.

5.2 WCDAS and CBU Command Uplink Transmit Interface

5.2.1 WCDAS and CBU Command Uplink EIRP

The Spacecraft shall meet all of its performance requirements with the uplink EIRP from WCDAS or CBU specified in Table C3SIRD163 for the transmission rates shown.

Table C3SIRD163: WCDAS/RBU Command Uplink EIRP

Modes On-Station Phase Storage Phase Normal 4 ksps 88 dBm 105 dBm Normal 64 ksps 95 dBm N/A

Contingency 4 ksps 105 dBm 105 dBm

Page 18 of 31 Printed Monday, September 25, 2023

ID

C3SIRD164

C3SIRD165

C3SIRD166

C3SIRD167

C3SIRD168

C3SIRD169

C3SIRD170

C3SIRD171

C3SIRD172

C3SIRD173

C3SIRD174

C3SIRD175

C3SIRD176

C3SIRD177

C3SIRD178

C3SIRD179

C3SIRD180

Object Number

5.2.2

5.2.2.0-1

5.2.3

5.2.3.0-1

5.2.4

5.2.4.0-1

5.3

5.3.1

5.3.1.0-1

5.3.2

5.3.2.0-1

5.3.3

5.3.3.0-1

5.3.3.0-2

5.3.4

5.3.4.0-1

5.3.5

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

5.2.2 WCDAS and CBU Command Uplink Polarization

The Spacecraft shall meet its performance requirements for WCDAS and CBU uplinks with RHCP for the on-station and storage mission phases for both normal and contingency modes.

5.2.3 WCDAS and CBU Command Uplink Phase Noise

The Spacecraft shall meet all of its performance requirements for WCDAS and CBU uplinks with a phase noise of less than 1.5° RMS when integrated from 10 Hz to a frequency equal to the modulation symbol rate.

5.2.4 WCDAS and CBU Command Uplink Frequency and Stability

The uplink center frequency is 2034.20000 MHz and will be maintained to one part in 109.

5.3 Spacecraft WCDAS and CBU Command Receive Requirements

5.3.1 Spacecraft Command Receive G/T

The Spacecraft contractor shall propose the specification value for the Command Receiver G/T as part of the Spacecraft contractor's ICD.

5.3.2 Spacecraft Command Receive Polarization

The Spacecraft receive polarization(s) will be determined by the contractor and incorporated into the Spacecraft contractor's ICD.

5.3.3 Spacecraft Command Rates

The Spacecraft command receiver data system shall be switchable between the low transmission rate 4 ksps (symbol rate including coding) corresponding to a low information rate 3.50 kbps (bit rate prior to coding) and the high transmission rate 64 ksps (symbol rate including coding) corresponding to a high information rate 56.00 kbps (bit rate prior to coding) command data uplinks. The 64 ksps link is required only for on-station mission phase during normal mode.

The Spacecraft command receiver data system shall be 4 ksps for the contingency mode.

5.3.4 Spacecraft Error Detection Coding

The Spacecraft command receiver data system shall process CLTU using BCH code as specified in CCSDS 231.0-B-4 [Applicable Document 6] in the Triple Error Detection (TED) mode and commands with any errors detected will be ignored. (CCR-X00162)

5.3.5 Spacecraft Command Data Randomization

Page 19 of 31 Printed Monday, September 25, 2023

ID

C3SIRD181

C3SIRD182

C3SIRD183

C3SIRD184

C3SIRD185

C3SIRD186

C3SIRD187

C3SIRD188

C3SIRD189

C3SIRD190

C3SIRD191

C3SIRD192

C3SIRD312

C3SIRD314

C3SIRD315

Object Number

5.3.5.0-1

5.3.6

5.3.6.0-1

5.3.7

5.3.7.0-1

5.3.8

5.3.9

5.3.9.0-1

5.3.10

5.3.10.0-1

5.3.11

5.3.11.0-1

5.3.11.0-2

5.3.11.0-3

5.3.11.0-4

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

The Spacecraft command receiver data system shall process randomized command data as specified in CCSDS 231.0-B-4 [Applicable Document 6].

Note: The Telecommand randomizer is different from the Telemetry randomizer. It is applied to the transfer frame prior to the BCH coding, whereas the Telemetry randomizer is applied after the block coding. (CCR-X00162)

5.3.6 Spacecraft Command Data Format

The Spacecraft command receiver data system shall process the 4 ksps and 64 ksps command uplinks received in the NRZ-M format.

5.3.7 Spacecraft Command Data Modulation

The Spacecraft command receiver data system shall process 4 and 64 ksps BPSK command signals directly modulating the command carrier and will follow the guidelines given CCSDS 401.0-B-31 [Applicable Document 7].

5.3.8 DELETED

5.3.9 Spacecraft Receive Dynamic Range

The Spacecraft contractor shall propose the specification value for the dynamic range of the command uplink signal as part of the Spacecraft contractor's ICD.

5.3.10 Command Receiver Not On-Off Switchable

The command receiver shall be permanently enabled.

5.3.11 System Protection

The Spacecraft command receiver data system shall comply with the requirements of NASA-STD-1006 [Applicable Document 12].

Bulk security shall be used.

Note: Here Bulk security means that the entire CLTU with no change to the imbedded transfer frame (no security fields added) needs to be encrypted with authentication.

(CCR-X00162)

The command receiver cryptographic system shall comply with the security requirements of a Level-1 system as defined in NIST.FIPS.140-3 [Applicable Document

14]. (CCR-X00162)

The spacecraft shall decrypt command CLTUs (a CLTU includes the start sequence, BCH codewords, and tail sequence) according to NIST SP 800-38D [Applicable Document 15] using the AES-256 cipher per FIPS-197 [Applicable Document 16].

Note: A CLTU may be segmented and transmitted in multiple encrypted and authenticated data units referred to as secured data units. Each secured data unit will also include an un-encrypted size field, nonce counter and MAC and will be prepended with a synchronization marker. (CCR-X00162)

Page 20 of 31 Printed Monday, September 25, 2023

ID

C3SIRD316

Object Number

5.3.11.0-5

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

The spacecraft shall authenticate each secured data unit containing a CLTU or segment of a CLTU according to NIST SP 800 38D (GCM) [Applicable Document 15] using the nonce counter and Message Authentication Code (MAC) contained in the transmitted secured data unit. (CCR-X00162)

Page 21 of 31 Printed Monday, September 25, 2023

ID

C3SIRD193

C3SIRD194

C3SIRD195

C3SIRD196

C3SIRD197

C3SIRD198

C3SIRD199

C3SIRD200

C3SIRD201

C3SIRD202

C3SIRD203

C3SIRD204

C3SIRD205

C3SIRD206

Object Number

6.0-1

6.0-2

6.0-3

6.0-4

6.1

6.1.1

6.1.1.0-1

6.1.1.0-2

6.1.2

6.1.2.0-1

6.1.2.0-2

6.1.2.0-3

6.1.3

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

6 Orbit Raising, Tracking, Telemetry, and Command (ORTT&C) Requirements

The ORTT&C service will support the launch and orbit raising mission phases. The command, tracking, and telemetry functions will also be used on station. The ORTT&C functions will work independently or simultaneously with the Housekeeping telemetry and WCDAS/CBU command functions.

An ORTT&C provider such as the NASA Deep Space Network (DSN), NASA Near Space Network (NSN), and Swedish Space Corporation (SSC) Space U.S. (formerly known as the (Universal Space Network (USN)), or a combination thereof will provide the primary support during the launch and orbit raising mission phases. The WCDAS/CBU support ORTT&C functions during the on-station and storage mission phases.

In section 6.1 functions common to command, telemetry, and tracking are described first, followed by the command functions common to ground and Spacecraft. Sections

6.2 and 6.3 cover ORTT&C command requirements for the ground and Spacecraft respectively. Sections 6.4 and 6.5 cover ORTT&C telemetry requirements for the Spacecraft and ground respectively. Finally, section 6.6 covers the tracking function.

The ORTT&C telemetry downlink will consist of Spacecraft and instrument engineering data, health and safety information, and command receipt verification. The telemetry data is transmitted from the Spacecraft to the ground, either through the WCDAS and CBU during on–station/ storage mission phases or the NEN/SSC ground stations during launch and orbit raising mission phases.

6.1 ORTT&C General Command, Telemetry, and Tracking

Parameters

6.1.1 ORTT&C Antenna Coverage

The Spacecraft shall meet its performance requirements when transmitting to and when receiving from ORTT&C ground antennas with elevation angles equal to or greater than 5 degrees during the launch and orbit raising mission phase.

The Spacecraft shall meet its ORTT&C performance requirements when transmitting and receiving using WCDAS/CBU antennas during on-station and storage mission phases in normal and contingency modes.

6.1.2 ORTT&C Polarization and Coverage

The Spacecraft shall meet all of its performance requirements with ORTT&C uplink transmit and downlink receive ground antennas with RHCP.

The contractor will select the Spacecraft receive and transmit polarizations and incorporate these into the Spacecraft contractor's ICD.

In the contingency mode, the Spacecraft shall provide > 75% of 4 pi steradians coverage for the ORTT&C telemetry and command links during the launch and orbit raising, storage, and on-station mission phases.

6.1.3 ORTT&C Modulation Indexes

Page 22 of 31 Printed Monday, September 25, 2023

ID

C3SIRD207

C3SIRD208

C3SIRD209

C3SIRD210

C3SIRD211

C3SIRD212

C3SIRD213

Object Number

6.1.3.0-1

6.1.4

6.1.4.0-1

6.1.5

6.1.5.0-1

6.1.6

6.1.6.0-1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

The carrier modulation indexes shall be determined by the contractor and incorporated into the Spacecraft contractor's ICD.

6.1.4 NEN and DSN Compatible

The ORTT&C links shall be designed within the constraints in Applicable Document 7 for ranging turnaround ratio, modulation types, and data rates. This requirement does not imply capabilities beyond those specified elsewhere in this IRD.

6.1.5 ORTT&C Command Link Requirements for Ground and

Spacecraft

The interface requirements for the ORTT&C command uplink are summarized in Table

C3SIRD211.

Table C3SIRD211: ORTT&C Uplink Requirements ORTT&C Uplink Transmit Requirement

EIRP

Orbit Raising Mission phase, normal or contingency modes

95 dBm at 1 ksps

On-Station and Storage Mission phases, contingency mode

105 dBm at 1 ksps

Storage Mission phase, normal mode 105 dBm at 4 ksps On-Station Mission phase, normal mode 95 dBm at 1 or 4 ksps

Frequency 2036.000 MHz Polarization RHCP Command low transmission rate (symbol rate including coding)

1 ksps

Command low information rate (bit rate not including coding)

875 bps

Command high transmission rate (symbol rate including coding)

4 ksps

Command high information rate (bit rate not including coding)

3.5 kbps

Format NRZ-M Modulation BPSK Coding BCH

Satellite Receive Polarization Contractor specified Coverage (contingency mode) > 75% of 4 pi steradians Command receive Eb/No Contractor specified BER < 1x10-5

(CCR-X00219)

6.1.6 Command Link Margin Requirement

The Spacecraft shall meet its ORTT&C Command requirements with the link margins specified in Table C3SIRD213 for the transmission rates shown over the life of the satellite and over the coverage region required for each mission phase.

Page 23 of 31 Printed Monday, September 25, 2023

ID

C3SIRD213

C3SIRD214

C3SIRD215

C3SIRD216

C3SIRD217

C3SIRD218

C3SIRD219

C3SIRD220

C3SIRD221

C3SIRD222

C3SIRD223

C3SIRD224

C3SIRD225

C3SIRD226

C3SIRD227

Object Number

6.1.6.0-1

6.1.7

6.1.7.0-1

6.1.8

6.1.8.0-1

6.1.8.0-2

6.2

6.2.1

6.2.1.0-1

6.2.2

6.2.2.0-1

6.2.3

6.2.3.0-1

6.3

6.3.1

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

Table C3SIRD213: ORTT&C Command Minimum Margin Requirements

Modes Tracking On-Station Phase

Storage Phase

Orbit Raising

Normal 1 ksps Off or On 6 dB 4 dB 0.5 dB Normal 4 ksps Off or On 4 dB 2 dB N/A

Contingency 1 ksps Off or On 2 dB 1 dB 0.5 dB

(CCR-X00186)

6.1.7 Uplink Atmospheric Loss

The Spacecraft shall meet all of its performance requirements with an uplink atmospheric attenuation loss of 2.5 dB (based on 99.99% one-way annual availability including scintillation) during normal operations in Geostationary orbit (this value may be reduced to 0.5 dB during LOR).

6.1.8 Uplink Pointing Loss

The Spacecraft shall meet all of its performance requirements with a pointing loss of

0.5 dB for the transmit antenna.

The satellite receive pointing loss will be determined by the contractor and incorporated into the Spacecraft contractor's ICD.

6.2 ORTT&C Uplink Command Parameters

6.2.1 ORTT&C Uplink Frequency and Stability

The uplink center frequency from DSN, NEN network, or another provider will be

2036.000 MHz and will be maintained to one part in 109.

6.2.2 ORTT&C Uplink EIRP

The minimum uplink EIRPs are found in Table C3SIRD223.

Table C3SIRD223: ORTT&C Command Uplink EIRP

Modes Tracking On-Station Phase

Storage Phase Orbit Raising

Normal 1 ksps Off or On 95 dBm 105 dBm 95 dBm Normal 4 ksps Off or On 95 dBm 105 dBm N/A

Contingency 1 ksps Off or On 105 dBm 105 dBm 95 dBm

(CCR-X00186) (CCR-X00219)

6.2.3 ORTT&C Phase Noise Requirement

The ORTT&C transmit command uplinks will have a phase noise of less than 1.5 degrees RMS when measured from 10 Hz to greater than the symbol equivalent bandwidth.

6.3 ORTT&C Command Receive Requirements

6.3.1 ORTT&C Command Receive G/T

Page 24 of 31 Printed Monday, September 25, 2023

ID

C3SIRD228

C3SIRD229

C3SIRD230

C3SIRD231

C3SIRD232

C3SIRD233

C3SIRD234

C3SIRD235

C3SIRD236

C3SIRD237

C3SIRD238

C3SIRD239

C3SIRD240

C3SIRD241

C3SIRD242

C3SIRD243

C3SIRD244

C3SIRD245

C3SIRD246

Object Number

6.3.1.0-1

6.3.2

6.3.2.0-1

6.3.2.0-2

6.3.3

6.3.3.0-1

6.3.3.0-2

6.3.4

6.3.4.0-1

6.3.5

6.3.5.0-1

6.3.6

6.3.6.0-1

6.3.7

6.3.7.0-1

6.3.8

6.3.9

6.3.9.0-1

6.3.10

418-XO-IRD-0043, RM Version, Geostationary eXtended Observations (GeoXO) SS to Ground Located Command, Control, and

Communications (SS-C3S) Interface Requirements Document (IRD)

The ORTT&C command receive G/T shall be specified by the…