Attachment D - PRAD.pdf

Effective Date: February 10, 2022 418-XO-PRAD-0037 Responsible Organization: GeoXO Flight Project/Code 418 Baseline Version 1.0

Geostationary and eXtended Observations (GeoXO) Payload Resources Allocation Document (PRAD)

Signature page

Prepared by:

Electronically approved by:

01/24/2022

Alan D. Reth 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

02/03/2022

Michelle P Rizzo Date GeoXO Flight Project, Observatory Manager

Approved by:

02/10/2022

Jason Hair Date GeoXO Flight Project, Project Manager

/GeoXO Flight Project Systems Engineering

PRAD

418-XO-PRAD-0037, RM Version, Geostationary eXtended Observations (GeoXO) Payload Resources Allocation Document (PRAD)

Version: 1.0 Printed by: rkhoover Printed on: Wednesday, February 16, 2022

No filter applied.

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Generated from DOORS 9.7.2.4

Contents

1 1Scope

1.1 1Overview

1.2 2Requirements Terminology

2 3Documents

2.1 3Applicable Documents

2.2 3Reference Documents

3 4Instrument Mass Allocation

3.1 4GeoI Instrument Mass Allocation

3.2 4GeoS Instrument Mass Allocation

4 5Instrument Power Allocation

4.1 5GeoI Instrument Power Allocation

4.1.1 5GeoI Instrument Average Operational Power

4.1.2 5GeoI Instrument Maximum Operational Power

4.1.3 5GeoI Instrument Average Survival Power

4.1.4 6GeoI Instrument Maximum Survival Power

4.2 6GeoS Instrument Power Allocation

4.2.1 6GeoS Instrument Average Operational Power

4.2.2 6GeoS Instrument Maximum Operational Power

4.2.3 7GeoS Instrument Average Survival Power

4.2.4 7GeoS Instrument Maximum Survival Power

5 8Instrument Data Rate Allocation

5.1 8GeoI Instrument Data Rate Allocation

5.2 8GeoS Instrument Data Rate Allocation

6 9Instrument INR Allocation

6.1 9GeoI Instrument INR

6.1.1 9GXI INR Allocation

6.1.2 9LMX INR Allocation

6.1.3 10OCX INR Allocation

6.2 10GeoS Instrument INR Requirements

6.2.1 10GXS INR Allocation

6.2.2 11ACX INR Allocation

Project: GeoXO Flight Project Systems Engineering Module: PRAD Baseline Version: 1.0

Contents ii

7 12Instrument-Driven GNC Allocations

7.1 12Attitude Control System Requirements Allocation

7.1.1 12Attitude Control Requirements

7.1.2 12Attitude Knowledge Requirements

7.1.3 12Attitude Rate Error and Latency Requirements

7.2 13Orbit Requirement Allocation

7.2.1 13Orbit Control Requirement Allocation

7.2.2 13Orbit Knowledge Requirement Allocation

8 15Instrument Disturbances

8.1 15GeoI Instrument Exported Disturbances

8.1.1 15GeoI Instrument Torque Allocation

8.1.2 15GeoI Instrument Integrated Angular Momentum Allocation

8.1.3 15GeoI Instrument Angular Momentum Allocation

8.1.4 16GeoI Instrument Bandpass-Filtered Angular Momentum Allocation

8.1.5 16GeoI Instrument Exported Linear Acceleration Bandpass Limits

8.1.6 19GeoI Instrument Exported Linear Acceleration Shock Response Spectra

8.2 20GeoI Instrument Imported Accelerations

8.2.1 20GeoI Instrument Imported Linear Acceleration Bandpass Limits

8.2.2 22GeoI Instrument Imported Linear Acceleration Shock Response Spectra

8.3 23GeoS Instrument Exported Disturbances

8.3.1 23GeoS Instrument Torque Allocation

8.3.2 24GeoS Instrument Integrated Angular Momentum Allocation

8.3.3 24GeoS Instrument Angular Momentum Allocation

8.3.4 25GeoS Instrument Bandpass-Filtered Angular Momentum Allocation

8.3.5 25GeoS Instrument Exported Linear Acceleration Bandpass Limits

8.3.6 27GeoS Instrument Exported Linear Acceleration Shock Response Spectra

8.4 28GeoS Instrument Imported Disturbances

8.4.1 28GeoS Instrument Imported Linear Acceleration Bandpass Limits

8.4.2 30GeoS Instrument Imported Linear Acceleration Shock Response Spectra

9 32Acronyms

Contents iii

Page 1 of 32 Printed Wednesday, February 16, 2022

ID

PRAD1

PRAD2

PRAD3

PRAD4

PRAD5

PRAD6

PRAD7

Object Number

1.0-1

1.1

1.1.0-1

1.1.0-2

1.1.0-3

1.1.0-4

418-XO-PRAD-0037, RM Version, Geostationary eXtended Observations (GeoXO) Payload Resources Allocation Document (PRAD)

1 Scope This document defines instrument resource allocations for the Geostationary Extended Observations (GeoXO) satellite. The resources covered by this document are: mass, power, data rate, image navigation and registration (INR), attitude, orbit, and disturbances.

1.1 Overview

This document, the Payload Resource Allocation Document (PRAD), provides bookkeeping for margin management of spacecraft resources required for GeoXO. The assumed GeoXO constellation as of the writing of this document, known as “Configuration 60,” comprises three National Oceanic and Atmospheric Administration (NOAA) satellites. The GeoXO satellites will be stationed at East, West, and Central locations, where the position designations are relative to the conterminous United States (CONUS). Both the East/West satellites include instruments for visible/infrared imaging, lightning mapping, and ocean color; these satellites are designated “GeoI.” The GeoXO Central Satellite includes instruments for infrared sounding, atmospheric composition, and potentially an instrument from a partner organization; these satellites are designated “GeoS.”

For most requirements covered by this document, the government levies different specification levels on the spacecraft and instruments, with the difference between the two values being held in reserve by the government. The PRAD shows spacecraft, instrument, and government reserve allocations for all such requirements. The reserve amounts documented herein are expressed in engineering units and as a percentage increase from the lower value, except for image navigation and registration (INR), where reserve is a percentage deducted from top-level Government Program Requirements. The government may release a portion of reserve to either or both parties affected by a particular requirement if it appears that existing allocations are not practically feasible.

The government captures instrument allocations from the PRAD in the Performance and Operational Requirements Documents (PORD), General Interface Requirements Document (GIRD) and/or Unique Instrument Interface Documents (UIIDs). Instrument allocations are expressed herein as “will” statements, with the corresponding “shall” statements appearing in other documents. Spacecraft allocation requirements appear in the PRAD, the Spacecraft Functional and Performance Specification (SCFPS), and the

GIRD.

The instruments must meet their performance requirements, given the spacecraft interface characteristics specified in the GIRD and UIIDs. Instruments must meet the instrument exported disturbance requirements specified in the GIRD and UIIDs. The satellite must meet its instrument interface requirements with all instruments operating at UIID instrument exported disturbance levels.

Page 3 of 32 Printed Wednesday, February 16, 2022

ID

PRAD9

PRAD10

PRAD11

PRAD12

PRAD13

Object Number

2.1

2.1.0-1

2.2

2.2.0-1

418-XO-PRAD-0037, RM Version, Geostationary eXtended Observations (GeoXO) Payload Resources Allocation Document (PRAD)

2 Documents

2.1 Applicable Documents

The following documents form a part of this specification to the extent specified herein.

RESERVED

2.2 Reference Documents

The following documents provide reference material for part of this document.

1. GeoXO Spacecraft Functional and Performance Specification (SCFPS), 418-XO-

PSPEC-0051

2. GeoXO General Interface Requirements Document (GIRD), 418-XO-GIRD-0041

3. GeoXO Imager (GXI) Unique Instrument Interface Document (UIID), 418-XO-

GXIUIID-0023

4. GeoXO hyperspectral radiometric Sounder (GXS) Unique Instrument Interface

Document (UIID), 418-XO-GXSUIID-0030

5. GeoXO Ocean Color (OCX) Unique Instrument Interface Document (UIID), 418-XO-

OCXUIID-0062

6. GeoXO Lightning Mapper (LMX) Unique Instrument Interface Document (UIID), 418-

XO-LMXUIID-0067

7. GeoXO Atmospheric Composition (ACX) Unique Instrument Interface Document

(UIID), 418-XO-ACXUIID-0072

8. GeoXO Imager (GXI) Performance and Operational Requirements Documents

(PORD), 418-XO-GXIPORD-0024

9. GeoXO hyperspectral radiometric Sounder (GXS) Performance and Operational

Requirements Documents (PORD), 418-XO-GXSPORD-0031

10. GeoXO Ocean Color (OCX) Performance and Operational Requirements Documents

(PORD), 418-XO-OCXPORD-0061

11. GeoXO Lightning Mapper (LMX) Performance Operational Requirements Documents

(PORD), 418-XO-LMXPORD-0066

12. GeoXO Atmospheric Composition (ACX) Performance and Operational Requirements

Documents (PORD), 418-XO-ACXPORD-0071

Page 17 of 32 Printed Wednesday, February 16, 2022

ID

PRAD108

PRAD109

Object Number

8.1.5.0-1

8.1.5.0-2

418-XO-PRAD-0037, RM Version, Geostationary eXtended Observations (GeoXO) Payload Resources Allocation Document (PRAD)

For each instrument, the translational accelerations induced by the instrument at each mount will not exceed the limits specified in the corresponding “UIID Instrument Exported” allocation in Table PRAD109. (Corresponding instrument “shall” statements are in their UIIDs.) The accelerations are those induced by operation of the sensor unit while mounted to a flexible interface. The limits apply to each orthogonal axis after the acceleration is filtered using an eighth-order band pass Butterworth filter with -3dB frequencies at f1 and f2. Note that the filter has a fourth-order roll-off on both sides of the response.

The GeoI Satellites shall limit linear accelerations at each instrument mount such that they are in accordance with the SCFPS column in Table PRAD109, when all instruments are in compliance with all exported disturbance requirements.

Page 32 of 32 Printed Wednesday, February 16, 2022

ID

PRAD155

PRAD156

Object Number

9.0-1

418-XO-PRAD-0037, RM Version, Geostationary eXtended Observations (GeoXO) Payload Resources Allocation Document (PRAD)

9 Acronyms ACX GeoXO Atmospheric Composition instrument cm centimeter g standard gravitational acceleration, 9.80665 m/s2

GeoI GeoXO-Imager/LM/OC satellite GeoS GeoXO-Sounder/AC satellite GeoXO Geostationary Extended Observations GIRD General Interface Requirements Document GXI GeoXO Imager GXS GeoXO Sounder IMF Instrument Mounting Frame INR Image Navigation and Registration kg kilogram LMX GeoXO Lightning Mapper m meter Mbps megabits per second µrad microradian ms milli-second NOAA National Oceanic and Atmospheric Administration OCX GeoXO Ocean Color instrument PORD Performance and Operational Requirements Document PRAD Payload Resource Allocation Document PTR Partner Instrument SCFPS Spacecraft Functional and Performance Specification SRS Shock Response Spectra SSP Sub Satellite Point UIID Unique Instrument Interface Document W Watts

Effective Date: February 10, 2022 418-XO-PRAD-0037 Responsible Organization: GeoXO Flight Project/Code 418 Baseline Version 1.0

Document Change Record (DCR)

CCR GeoXO#: X00056 Rev: Title: 418-XO-PRAD-0037: baseline the PRAD Contract # N/A GOES S/C: GeoXO Effectivity: Spacecraft CCB Status: Approved Doc #: 418-XO-PRAD-0037 CCB Date: 02/10/2022 Doc Version: 1.0 Contract Mod#: N/A DOORs Version: 1.0 Doc Change Date: Feb. 10, 2022 DOORs ID #: 1.0