Appendix A LEGS 1 - 3 System Requirements.pdf

Appendix A: LEGS 1, 2, and 3 System Requirements

Req. ID Req. Title Req. Statement Notes

LEGS Sources Sought.001

Earth Orbiting Platform Coverage

LEGS shall provide line-of-sight service coverage to platforms between 36,000 km and 2,000,000 km.

Sought.002

Antenna modes of Operation

LEGS shall track mission platforms in manual, ephemeris-driven, and RF-driven modes of operation for all receive signal bands supported by a given asset.

Sought.003

Antenna RF beam collimation

LEGS assets supporting Ka-band shall have beam peaks for all supported bands collimated to within +/- 3dB of the narrowest beam peak.

Sought.004 Autotrack Handover

LEGS shall support automatic autotrack handovers between supported bands of each asset.

Sought.005

Autotrack Band Selection

LEGS shall be capable of allowing configurable preferences for autotrack bands for a given pass or mission configuration.

Sought.006

Return Link Acquisition and Re-acquisition Time

LEGS shall provide signal acquisition times and signal reacquisition times defined in Table D-1 for ≥90% probability of acquisition at the required C/No values for the worst-case required BER (see CCSDS 130.1-G-3), measured from the time the signal is present at the Antenna to the time the following actions have occurred:

1. Carrier synchronization,

2. Symbol synchronization,

3. Viterbi decoder synchronization, if applicable,

4. Derandomizer synchronization, if applicable,

5. Block code synchronization, if applicable,

6. Frame synchronization, if applicable,

7. Data polarity ambiguity resolution, if applicable,

8. Data channel ambiguity resolution, if applicable.

Sought.007

Return Link Frequency Uncertainty

LEGS shall, at return link acquisition, support the following carrier frequency acquisition ranges for the bands supported by a given LEGS asset:

X-Band: ± 500 kHz Ka-Band: ± 1.8 MHz

Sought.008

Unpowered Flight Doppler Dynamics

LEGS shall meet its specified signal acquisition and tracking performance for the following unpowered flight dynamics:

Range Rate: ≤12 km/s Range Acceleration: ≤15 m/s² Range Jerk: ≤ 0.02 m/s³

Sought.009

Powered Flight Signal/Doppler Dynamics

LEGS shall meet its specified signal acquisition and tracking performance for the following powered flight dynamics:

Range Rate: ≤15.0 km/s Range Acceleration: ≤50.0 m/s² Range Jerk: ≤ 2.0 m/s³

Sought.010

Forward Service Break Lock

LEGS shall provide a break-lock function which is used to break the forward service signal lock when it is suspected that the customer transponder has false locked.

Sought.011

Return Link Symbol Slippage

LEGS shall provide, for the Ground Station Symbol Synchronizer, a mean time between cycle slips in the symbol clock recovery loop of either ≥90 minutes or ≥10¹⁰ clock cycles, whichever is greater (but maximum time 6 hours if 10¹⁰ not reached for extreme low data rates), for the C/No and BER performance as follows:

a. Uncoded and convolutional encoding:

C/No required for 10⁻⁵ BER

b. LDPC and Turbo encoding: C/No required for 10⁻⁵ BER Note: This requirement applies for transition densities of at least 40% for NRZ symbols and any transition density for bi-phase symbols

Sought.012

Return Link Carrier Cycle Slippage

LEGS shall provide Ground Station Carrier mean time between cycle slips in the carrier tracking loop of ≥90 minutes for the greater of 27.5 dB-Hz or 3 dB below the C/No that produces the worst-case required BER operating point.

Sought.013 C/No Variation

LEGS downlink services shall accommodate an input C/No variation of 6 dB, at a rate not to exceed 10 dB/sec, without losing carrier lock or symbol lock, assuming 6 dB drop is not below the carrier slip and cycle slip C/No.

Sought.014

Number of Simultaneous Forward Links

LEGS shall simultaneously provide one forward link per frequency band supported by an antenna asset.

Sought.015 Transmit Polarization

LEGS shall provide independently selectable transmit Left Hand Circular Polarization (LHCP) or Right Hand Circular Polarization (RHCP) for each of the specified bands supported by a LEGS asset.

Sought.016 Transmit Emissions

LEGS shall meet NTIA regulations as defined in ITU Redbook Section 5.6 for transmitter in-band and out-of-band spurious and emission mask at the required EIRP for each transmit signal.

Sought.017

Forward Link Doppler Compensation

LEGS shall provide user selectable (enable/disable) Doppler compensation to the forward link based on provided vectors.

Sought.018

Transmit Inhibit Mask

LEGS shall implement a configurable forward RF signal transmit inhibit mask within which transmission is automatically prohibited.

Sought.019 Forward Latency

LEGS shall begin to radiate a forward link data to a user mission platform within 125 ms of its receipt at the local boundary of the ground station network provided the message queue is empty at time of receipt.

Sought.020

Forward Link Data Rate-Metering and Buffering

LEGS shall rate-meter and buffer received forward link data.

Sought.021 Idle Patterns

LEGS shall insert a configurable idle sequence pattern in frame data before modulation when no forward data frames are available from the external system, with configuration options that include (1) an idle sequence of alternating "ones" and "zeros", and (2) Idle Transfer Frames in accordance with CCSDS 732.0-B-3, AOS Space Data Link Protocol.

Sought.022

Forward Link Gain Flatness (Signal Distortions)

LEGS shall meet the following transmit gain flatness constraints, as applicable for the bands supported by a given asset:

a. X-Band: ≤ 0.8 dB P-P over center frequency ± 10 MHz

b. Ka-Band: ≤ 0.8 dB P-P over center frequency ± 40 MHz

Sought.023

Forward Link Phase Nonlinearity (Signal Distortions)

LEGS shall meet the following transmit phase nonlinearity constraints, as applicable for the bands supported by a given asset:

a. X-Band: ≤ 8.6 degrees P-P over center frequency ± 10 MHz

b. Ka-Band: ≤ 8.6 degrees P-P over center frequency ± 40 MHz

Sought.024

Forward Link Phase Noise (Signal Distortions)

LEGS shall meet the following transmit phase noise constraints, as applicable for the bands supported by a given asset:

a. X-Band:

1 Hz to 10 Hz: 6 deg RMS 10 Hz to 100 Hz: 3 deg RMS 100 Hz to 1 kHz: 2.5 deg RMS 1 kHz to 10 MHz: 2.5 deg RMS

b. Ka-Band:

1 Hz to 10 Hz: 10 deg RMS 10 Hz to 100 Hz: 5 deg RMS 100 Hz to 1 kHz: 5 deg RMS 1 kHz to 40 MHz: 2 deg RMS

Sought.025

Forward Link AM/PM (Signal Distortions)

LEGS shall meet the following transmit AM/PM constraints, as applicable for the bands supported by a given asset:

a. X-Band: ≤ 10 deg/dB

b. Ka-Band: ≤ 7 deg/dB

Sought.026

Forward Link SNR (Signal Distortions)

LEGS shall provide a transmit signal to noise ratio (SNR), of ≥ 42 dB for all transmit bands supported by a given asset.

Sought.027 Receive Polarization

LEGS shall independently receive simultaneous Left Hand Circular Polarization (LHCP) and Right Hand Circular Polarization (RHCP) at each receive service band supported by a given LEGS asset.

Sought.028

Return Service BER Performance – Implementation Loss

LEGS shall provide an implementation loss within ≤2.0 dB of theoretical Eb/No [Energy per Bit (Eb) to Spectral Noise Density (No)] for a given coding scheme and BER for an input signal with AWGN, ground system distortions, and user mission distortions that are compliant with the LEGS SRD Appendix Tables A-1 (X-band), and A-2 (Ka-band). See CCSDS 130.1-G-3 for theoretical BER performance of coding schemes. Implementation loss is limited to theoretical BER performance values from 10⁻⁵ to 10⁻⁹, as applicable for a specific coding scheme.

Sought.029 LEGS Packet Loss

LEGS forward and return data packet loss between the modem and the LEGS system boundary shall not exceed 0.0005%.

Sought.030

Return Delivery Latency

LEGS shall introduce one-way latency for return data services from receipt at the antenna of the end of the input frame or block to when the end of the output of the same frame or block is made available to the local boundary of the ground station network of no greater than 1 second.

Sought.031

Time Tagging Accuracy

LEGS shall time tag customer downlink data for the following data rates with an error of:

< 125 kbps: ±25% of the data bit period ≥ 125 kbps: ±2 microsecond Tagging occurs upon reception of the last bit, after demodulation, decoding, and synchronization, in Earth Received Time (ERT) relative to Coordinated Universal Time (UTC) in compliance with the CCSDS standard specified in Time Code Formats (CCSDS 301.0-B-4).

Tagging occurs on detected data frames in Earth Received Time (ERT) relative to Coordinated Universal Time (UTC) in compliance with the CCSDS standard specified in Time Code Formats (CCSDS 301.0-B-4), and as defined for Earth- Receive-Time IAW the CCSDS 911.1, 911.2, and 911.5.

Sought.032

Return Channel Time Delay

LEGS shall make available, to each supported mission, Return Channel Time Delay (RCTD) values for each supported service configuration, with sufficient precision and accuracy to maintain the accuracy of ERT time tags specified in LEGSa.3.2270.

< 125 kbps: ±25% of the data bit period ≥ 125 kbps: ±2 microsecond

Sought.033 Test Loops

LEGS shall support short and long loop test loops, including uplink and downlink test loops, for all bands supported by a given LEGS asset.

Sought.034

Forward Link Modulation Inhibit

LEGS shall provide a capability to inhibit modulation of any Uplink Service carrier through a command.

Sought.035 Axial Ratio

LEGS shall provide an axial ratio of less than or equal to 1 dB for each polarization (RHCP and LHCP) across the frequency ranges of all transmit and receive bands supported by the given asset.

Sought.036

RF Performance in Spectral Environment

LEGS shall meet return service performance with all forward services operating at the defined EIRP and the RF interference signals present at the antenna received input.

Sought.037

Return Link Data Buffering

LEGS shall buffer return data to account for external network latency and latency variability impacts.

Sought.038

VCID Frame Filtering

LEGS shall provide a configurable capability to filter CCSDS Virtual Channel (VC) frames from the downlink baseband data stream.

Sought.039 Network Monitoring

LEGS shall monitor status and performance parameters of LEGS site equipment/systems.

Sought.040

Network Control and Configuration

LEGS shall control and configure all network assets, including autonomous configuration and automatic subsystem fail over for unattended operations.

Sought.041

Schedule-driven Operations

LEGS shall perform schedule driven system configuration and execution of scheduled pass support.

Sought.042

Scheduling Responsiveness

LEGS shall be capable of executing a new or modified scheduled services within 5 minutes of receipt of the schedule information, assuming no other services are active.

Sought.043 Schedule Validation

LEGS shall validate schedule messages received within 3 seconds of receiving a schedule message, where schedule validation includes checks on message format and content compliance, conflicts with existing schedule, system capability, and inter-service time constraints.

Sought.044

Acquisition Data Processing

LEGS shall process received acquisition data to support execution of signal acquisition, antenna pointing, and Doppler measurement/compensation functions.

Sought.045

Pre-event Service Set-up Time

LEGS shall configure operational equipment for an upcoming service within a time not to exceed:

(1) 5 minutes if setup includes antenna pointing

(2) 2 minutes if setup does not include antenna pointing.

Sought.046

Post-event Return to Idle State Time

LEGS shall return operational equipment to defined idle state configuration within:

(1) 5 minutes of the end of a scheduled event if returning to the idle state includes antenna stow,

(2) 2 minutes of the end of a scheduled event if returning to the idle state does not include antenna stow.

Sought.047

Real-Time System Reconfiguration

LEGS shall begin reconfiguration of an ongoing service for a predefined set of service parameters within 30 seconds of receiving a validated reconfiguration request.

Sought.048 Station Logging

LEGS shall provide logging of all operator, system, and automated data entries, data modifications, and faults.

Sought.049

Scheduled Services Anomaly Notification

LEGS shall provide notifications to defined external systems of anomalies affecting LEGS scheduled services.

Sought.050

Status/Performance Data Time Tagging

LEGS shall time stamp collected status and performance data with UTC (USNO) with an accuracy ≤10ms and a resolution of ≤1ms.

Sought.051

Operator Schedule View

LEGS shall provide an interface that gives LEGS operators the ability to query and view LEGS operational schedules.

Sought.052 Operator Interface

LEGS shall provide an interface to operators that provides situational awareness, allows monitoring of equipment status, and permits control of equipment configurations.

Sought.053

Operator Remote Access

LEGS shall provide access to the remote operator interface commensurate with all applicable standards in NPR 2810.1F governing remote access and user authentication.

Sought.054

Operator Manual Scheduling

LEGS shall provide operators with the appropriate credentials the capability to manually enter schedule requests.

Sought.055

Operator Support for Human Spaceflight

LEGS shall provide active, dedicated operator support for all scheduled events involving human spaceflight for the duration of the event.

Sought.056

Automation For Staffing Approach

LEGS shall include automation to support being staffed 8 hours per day, Mon-Fri, to support routine uncrewed mission operations.

Sought.057

LEGS Automated Alarm Notifications

LEGS shall provide automated alarms and notifications to designated operators to support and enable operator response to anomalies.

Sought.058

Ground Station data and information analysis and reporting

LEGS shall provide the ability for operators to retrieve, analyze and trend system functionality and performance using logged ground data.

Sought.059

Service Accounting Reports - Generation

LEGS shall provide the ability for operators to generate offline Service Accounting Reports to document the performance of the system that occurred during provisioning of customer support.

Sought.060

Service Accounting Reports - Retention

LEGS shall retain logged service accounting input data online for a minimum of one year.

Sought.061

Schedule External Interface

LEGS shall receive schedule messages from the external Schedule System.

Sought.062

Schedule Validation External Interface

LEGS shall provide a schedule validation response to the external Schedule System for each schedule message received.

Sought.063

Unused Time External Interface

LEGS shall provide unused time messages to the external Schedule System.

Sought.064

In-service Reconfiguration Request External Interface

LEGS shall receive in-service reconfiguration requests.

Sought.065

In-service Reconfiguration Validation Interface

LEGS shall provide a validation response for each in-service reconfiguration request received.

Sought.066

Event Status and Performance Data Interface

LEGS shall provide a defined set of event status and performance data to external systems.

Sought.067

Ground Station Health and Status Interface

LEGS shall provide ground station health and status information, to include notifications of any resource changes that impact the ability to deliver any services that are scheduled, to external systems.

Sought.068 Site Weather Data

LEGS shall provide site weather data to external users and LEGS operators for each antenna asset under LEGS MCS control.

Sought.069

Acquisition Data External Interface

LEGS shall interface with the Acquisition/Tracking Data System, via the SCaN Program Operations Cloud environment, to receive acquisition data.

Sought.070

Tracking Data Message Interface

LEGS shall interface with the Acquisition/Tracking Data System, via the SCaN Operations Cloud environment, to send radiometric data.

Sought.071

Offline Access to Tracking Data

LEGS shall provide archived tracking data from the LEGS sites will be stored in the SCaN Operations cloud environment. This stored data will be provided to FDF upon request.

Sought.072

Externally Accessible Browser Portal

LEGS shall provide an externally accessible secure browser-based portal to view information related to the ground station, to include:

a. Schedule timeline with associated activities.

b. Station Status.

c. In-service status.

d. Weather data.

Sought.073

Externally Accessible Browser Portal – User Actions

The externally accessible secured browser-based portal shall be able to initiate actions authorized for external users, to include the ability to:

a. Manage schedule activities.

b. Export schedule to a standard format.

c. Submit in-service reconfiguration requests.

Sought.074

Use of the SCaN Operations Cloud (SPOC) environment

LEGS sites shall utilize the SCaN Operations Cloud environment for data transport and storage when feasible

Sought.075

Connections to the SCaN Operations Cloud environment

AWS Direct Connect will be used to connect to the SCaN Operations Cloud environment

Sought.076

Return Service Data External Interface

LEGS shall interface with the SCaN Operations Cloud environment to send return data.

Sought.077

Forward Service Data External Interface

LEGS shall interface with the SCaN Operations Cloud environment to receive forward data.

Sought.078

Schedule Data External Interface

LEGS shall make validated scheduled Activities available to external users.

Sought.079 CP External Interface

LEGS shall follow the requirements in the SCaN-CP IRD when using NASA Communications Program (CP) Network services.

Sought.080

ICAM External Interface

LEGS shall follow the requirements in the SCaN-ICAM IRD in using NASA ICAM services.

Sought.081

Timing and Frequency Reference Interface

LEGS shall interface with an external time and frequency reference system.

Sought.082

Mission Voice Interface

LEGS shall interface to the enterprise mission voice system.

Sought.083

LEGS Node Inherent Availability

LEGS shall provide an inherent availability of 0.99 measured over any 10,000 hour period for a given service.

Sought.084

LEGS Node Operational Availability

LEGS shall provide an operational availability of 0.99 measured over any 10,000 hour period for each service.

Sought.085 Environmental

LEGS shall meet the operational performance and survivability characteristics necessary for the defined environmental conditions of each site.

Sought.086

Operational Wind Conditions

LEGS shall meet all operational performance during sustained winds of up to 48 km/hr (30 miles/hr) with gusts of 72 km/hr (45 miles/hr)

Sought.087 Wind Survivability

LEGS shall survive winds of 130 km/h (81 miles per hour [mph]) winds in any position and 205 Km/h (128 mph) in stow without structural damage.

Sought.088

Service Life - Electrical and Mechanical

LEGS shall have electro-mechanical, electronic, and electrical components that are sustainable for > 15 years from the ORR date for that site, where sustainment includes all activities to service, repair, or upgrade station equipment without diminishing available functionality or increasing power, space, and cooling needs.

Sought.089

Service Life - Antenna and Facility

LEGS shall have a serviceable life expectancy of > 30 years from the ORR date for that site for the antenna, structures, and facilities.

Sought.090

Logistics and Sparing Support

LEGS shall provide on-site sparing and logistics support to meet the required Aₒ and Service Restoration.

Sought.091 Asset Maintenance

LEGS shall allow authorized physical and logical access necessary to perform preventative and corrective maintenance activities.

Sought.092

Restoration of Service

LEGS shall restore service within one hour for 95% of all service outages when averaged over a period of one year.

Sought.093 Failover Performance

LEGS shall automatically detect a failure and execute a failover to recover redundant service capabilities within 10 seconds. This excludes antenna failures, and other failures where redundancy does not exist.

Sought.094

Operator Failover Enable

LEGS shall allow operators to enable or disable automated failover on a per service basis (forward, return, tracking) for each frequency band supported.

Sought.095 Fault Alerts

LEGS shall provide operators notification of faults in a manner that distinguishes fault criticality.

Sought.096 Fault Detection LEGS shall detect faults which would cause customer service degradations or outages.

Sought.097

Operator Manual Failover

LEGS shall allow operators to initiate a manual failover on a per service basis (forward, return, tracking) for each frequency band supported.

Sought.098 Security Functions

LEGS shall be compliant with all applicable NASA standards governing IT, physical, and personnel security per NPR 2810.1F, in turn following the NIST Risk Management Framework (RMF) as guided by the FIPS- 199 system categorization.

Sought.099 Authentication

LEGS shall be capable of local high-availability multi-factor authentication (MFA) of users to access LEGS resources.

Sought.100

Detect and Report Cyber-Security Incident

LEGS shall provide automated means to detect an active cyber-security incident configurable in near-real time through continuous monitoring and alert system operators immediately after detection occurs.

Sought.101

Certificate Network Access

LEGS shall employ certificate-based network access control to authenticate known devices and disallow connections from unidentified sources.

Sought.102

Malicious Code Detection

LEGS shall detect malicious code being introduced into its information processing components.

Sought.103 Safety

LEGS shall comply with all applicable safety requirements detailed in NASA Procedural Requirement, NPR 8715.3, NASA General Safety Program Requirements, and any location-specific safety regulations as listed in the Applicable Documents listing in the SRD.

Sought.104

RF Radiation Protection

LEGS shall comply with the Goddard Space Flight Center (GSFC) Procedure Requirements (GPR) Radio Frequency Radiation Protection NASA GPR 1860.3C.

Sought.105

Software Assurance and Safety

LEGS shall comply with NASA-STD- 8739.8, Software Assurance and Software Safety Standard., were applicable

Sought.106 Operational Software

LEGS shall include only software that complies with NPR 7150.2D, NASA Software Engineering Requirements.

Sought.107

Concurrent support of Test, Maintenance, and Operations

LEGS shall provide sufficient equipment and facilities to support testing and maintenance involving the operational system without impacting operations, for test and maintenance activities that are not related to the antenna.

Sought.108

Mission Voice Capability

LEGS shall support voice communications with other authorized NASA Institutional elements.

Sought.109

Future Mission Processing Support

LEGS shall provide modular, reconfigurable, and/or extensible signal processing capabilities to enable the addition of new modulation and encoding combinations, upgrades to and the addition of signal processing equipment, and expansion of signal processing connections.

Sought.110 Simulation

LEGS shall provide simulation capabilities necessary to support testing and operator training.

Sought.111

Timing and Frequency Reference

LEGS shall use an external time and frequency reference for distribution to ground station equipment that meets the frequency signal quality and time signal synchronization characteristics defined in Table 5.6-1 of 458-REQ-0002.

Sought.112 Collimation System

LEGS shall provide a collimation capability at all supported bands that, at a minimum, supports tests for antenna alignment, calibration, different polarization, and antenna tracking.

Sought.113 Antenna Location

LEGS antenna locations shall be known to an accuracy of 2 cm horizontal and 3 cm vertical.

Sought.114

Ground Readiness Network Tests

LEGS shall configure and execute services in support of scheduled forward and return ground readiness network test events.

Sought.115 CP Services

LEGS shall use available CP Network services to support ground-to-ground network communications capabilities except when a CP Network service is not feasible or desired.

Sought.116 ICAM Services

LEGS shall use NASA’s ICAM services for identity and account management, authentication, directory services, and public key infrastructure.

Sought.117

Operator Training and Certification

LEGS shall enable operator training and certification without impacting ongoing operations.

Sought.118 LEGS Facilities

LEGS shall provide and maintain facilities that house LEGS resources in accordance with applicable laws and regulations.

Sought.119

Compatibility Test Capability

LEGS shall provide compatibility test capabilities representative of ground station asset signal processing capabilities to enable compatibility testing with missions

Sought.120

Record and Playback of Data for Testing

LEGS shall provide a capability to record and playback data at IF and baseband as part of a test configuration for all receive signal bands supported by a given asset.

Sought.121

Rules for Design, Development, Verification and Operation of Flight Systems

LEGS shall comply with the rules defined within Rules for the Design, Development, Verification, and Operation of Flight Systems, GSFC-STD-1000 as applicable to the LEGS system.

Sought.122

Coordinate System Standard

LEGS shall use the Earth-centered J2000 inertial coordinate system.

Sought.123

Lunar Surface Coverage

LEGS shall provide line of sight service for the portion of the lunar surface visible from a given LEGS location at all azimuth angles and at elevation angles above 10 degrees.

Sought.124 Cis-Lunar Coverage

LEGS shall have service-capable line of sight to user mission platforms in Near- Rectilinear Halo Orbit (NRHO) at all azimuth angles and at elevation angles above 10 degrees.

Sought.125

Locally record baseband return data AOS frames

LEGS shall record all return link baseband data AOS frames locally at the ground station (referred to as the Line Outage Recording (LOR) function).

Plan is to re-allocate these functions to the

SCaN Operations Cloud Environment

Sought.126

LOR Data Retention Timespan

LEGS shall retain LOR data and make that data available to customers for at least 14 days after the return data was initially recorded. LOR data will be stored in the SCaN Operations Cloud environment.

LEGS Sources Sought.127

Mark selected LOR Data for indefinite retention

LEGS shall provide the ability to identify portions of recorded LOR data for indefinite retention.

LEGS Sources Sought.128

LOR Data Replay to Customer via SLE

LEGS shall provide LOR data via the CCSDS Space Link Extension (SLE) Offline Delivery service.

LEGS Sources Sought.129

Saving LOR Data Via Retrievable Physical Storage Media

LEGS shall, upon customer request, provide stored LOR data in a physical format.

LEGS Sources Sought.130

Providing separately stored LOR data to Customer

LEGS shall provide separately stored LOR data electronically, via the CCSDS SLE Offline Delivery service, and physically via the applicable physical storage media.

LEGS Sources Sought.131

LOR Data Replay Rate to Customer

LEGS shall provide LOR data, at a configurable rate per band (X and Ka), of up to 100 Mbps (without overhead).

LEGS Sources Sought.132

Forward link enabled/disabled at contact startup

LEGS shall initiate each contact with the ability to provide forward link service either enabled or disabled.

Sought.133

Ability to remotely enable/disable station forward link capability

LEGS shall allow the mission customer, during contacts, to enable or disable the station’s forward link service.

Sought.134

Interface to MCC and BCC for Gateway

LEGS shall interface with the SCaN Program Operations Cloud environment mission operations support.

Sought.135

SLE Interface to MCC/BCC for LEGS Real-Time Forward & Return Data

The CCSDS Space Link Extension (SLE) protocol for the exchange of real-time forward and return data with the mission data processing systems.

Sought.136

Simultaneous Frequency Operation

LEGS shall be capable of providing simultaneous X and Ka-band forward and return links.

Sought.137

Multiple Spacecraft Per Antenna (MSPA)

LEGS shall be capable of supporting at least four simultaneous RF return links that are within the antenna beamwidth, in any combination of the X and Ka-band, of which a maximum of 3 can be Ka-band links.

Sought.138

X-Band Effective Isotropic Radiated Power (EIRP)

LEGS shall provide forward services with an EIRP of at least 86 dBW at X-band.

Sought.139

X-Band Forward Frequency Range

LEGS shall provide X-Band forward services in accordance with the frequency range of 7145-7235 MHz.

Sought.140

X-Band Forward Subcarrier Frequency

LEGS shall support forward subcarrier frequencies of 5 kHz to 2 MHz.

Sought.141

Ka-Band Effective Isotropic Radiated Power (EIRP)

LEGS shall provide forward services with an EIRP of at least 89 dBW at Ka-band.

Sought.142

Ka-Band Forward Frequency Range

LEGS shall provide Ka-Band forward range of 22.55-23.15 GHz.

Sought.143

Forward Service Data Rates

LEGS shall support the following forward service symbol rate ranges:

X-Band: 1 ksps to 10 Msps Ka-Band: 2 Msps to 50 Msps

Sought.144

Forward Link Modulation

LEGS shall support the following forward link modulation schemes:

X-Band: PCM/PM/NRZ-L, PCM/PM/Bi- Phase L, PCM/PM/PSK, OQPSK, BPSK, Filtered BPSK, Filtered OQPSK, GMSK Ka-Band: Filtered OQPSK, Filtered BPSK, OQPSK, BPSK, QPSK, GMSK

Sought.145

Forward Link Coding Schemes

LEGS shall provide, at a minimum, the following forward link coding, in compliance with the CCSDS standard specified in Telemetry Synchronization and Channel Coding (CCSDS 131.0-B-3):

1. Uncoded

2. LDPC code, rates 1/2, 2/3, 4/5, each with information block lengths of 1024, 4096, and 16384 bits in compliance with the CCSDS standard specified in CCSDS TC Synchronization and Coding (CCSDS 231.0-B-3).

3. LDPC code, rate 7/8 (8160, 7136), information block length of 7136 bits in accordance with the CCSDS TM Synchronization and Channel Coding

(CCSDS 131.0 B-3).

Sought.146

Forward Link Symbol Formats

LEGS shall support the following forward link symbol formats:

X-Band: NRZ-L, Bi-Phase L Ka-Band: NRZ-L

Sought.147 G/T for X-Band

LEGS shall provide return services with G/T greater than or equal to 39 dB/K over the X-band return frequency range at 5 deg of elevation in clear sky conditions, referenced to the input of the X-band receiver while transmitting in the center of all transmit bands at the maximum EIRP.

Sought.148

X-Band Return Frequency Range

LEGS shall provide X-Band return services in accordance with the frequency range of 8400-8500 MHz.

Sought.149

X-Band Return Subcarrier Frequency

LEGS shall support return subcarrier frequencies of 5 kHz to 2 MHz.

Sought.150 G/T for Ka-Band

LEGS shall provide return services with G/T greater than or equal to 47.5 dB/K over the Ka-band return frequency range at 10 deg of elevation in clear sky conditions, referenced to the input of the Ka-band receiver while transmitting in the center of all transmit bands at the maximum EIRP.

Sought.151

Ka-Band Return Frequency Range

LEGS shall provide Ka-Band return range of 25.5-27.0 GHz.

Sought.152

Return Service Data Rates

LEGS shall support at least the following return service data rate ranges:

X-Band: 1 ksps to 20 Msps Ka-Band: 2.0 Msps to 200 Msps

Sought.153

Return Link Modulation

LEGS shall support the following return link modulation schemes:

X-Band: PCM/PM/NRZ-L, PCM/PM/Bi- Phase L, PCM/PM/PSK, BPSK, QPSK, OQPSK, Filtered BPSK, Filtered OQPSK, GMSK

Ka-Band: BPSK, QPSK, OQPSK, Filtered BPSK, Filtered OQPSK, GMSK, 8PSK

Sought.154

Return Link Decoding Schemes

LEGS shall provide, at a minimum, the coding capabilities below for return link service, in compliance with the CCSDS standard specified in Telemetry Synchronization and Channel Coding

(CCSDS 131.0-B-3):

1. Uncoded

2. Convolutional code, constraint length 7, rate 1/2

3. LDPC AR4JA code rates 1/2, 2/3, 4/5, block sizes of 1024, 4096, and 16384 bits

4. LDPC code rate 7/8 (8160, 7136), block size 8160 bits

5. Turbo code, rates 1/6, 1/4, 1/3, 1/2 (X-band only)

6. Reed-Solomon (RS) (255,223) (including shortened), interleaving depth I=(1,2,3,4,5,8), concatenated with convolutional code, constraint length 7, rate 1/2

7. Reed-Solomon (255,239) (including shortened), interleaving depth I=(1, 2, 3, 4, 5, 8), concatenated with convolutional code, constraint length 7, rate ½ and 5/6.

Sought.155

Return Link Symbol Formats

LEGS shall support the following return link symbol formats:

X-Band: NRZ-L, Bi-Phase L Ka-Band: NRZ-L

Sought.156

PN Range Tracking Services - PN Chip Rates

LEGS shall support PN chip rates up to a nominal 3.2 megachips per second (Mcps) with the exact quantitative maximum chip rate a function of the uplink carrier frequency and l≤16 with values of l stated in Table B-1 of CCSDS 414.1-B-3 and more thoroughly as lCR in Table 1 of Pseudo-Noise and Regenerative Ranging, Deep Space Network, DSN 810-005, 214, Rev B.

Sought.157

PN Range Tracking Services - X-band

LEGS shall provide PN ranging capability as defined in CCSDS 414.1-B-3, Pseudo- Noise (PN) Ranging Systems, on the Command and Telemetry link for X-band.

Sought.158

PN Range Tracking Services - Integration Time

LEGS shall provide PN ranging capability with selectable Integration times in increments of ≤1s from 1.0 second to 60.0 seconds.

Sought.159

Tone Range Tracking Services - X-Band (TBR – defer per

LEGS CR-033,

review with SCaN)

LEGS shall support the capability for transmitting and receiving X-band tone ranging signals (configurable tone capability).

Sought.160

PN Range Tracking Services - Random Error Performance, X-band

LEGS shall meet with a 3.0 dB implementation margin the standard deviation PN range measurement random error performance on the X-band link according to DSN 810-005, 214 Rev B Equation 53.

Sought.161

PN Range Tracking Services - Systematic Error Performance, X-band

LEGS shall provide the standard deviation of PN range error performance of ≤2.0 m, for systematic errors due to the uncertainty of ranging calibration of delay in ground equipment chains and RF paths for X-band.

(Note: Includes range zero set functions and variation over time between range zero set measurements)

Sought.162

Doppler Tracking Services - Random Error Performance, X-band

LEGS shall meet the standard deviation range-rate measurement random error performance on the X-band link according to the following equation (Note: Equation accounts for 3 dB implementation loss. See DSN DSN 810-005, 202 Rev. E, Eqs. 13, 26, 28 for derivation.)

Sought.163

Doppler Tracking Services - Integration Time

LEGS shall provide Doppler capability with selectable Integration times in increments of ≤1s from 1.0 second to 60.0 seconds.

Sought.164

Doppler Tracking Services - Data Formatting, X-band

LEGS shall provide X-band Doppler products as an integrated phase count in accordance with the LEGS External Ground

IRD.

Sought.165

Doppler Tracking Services - X-Band

LEGS shall support X-Band 1-way and 2-way Doppler measurements.

Sought.166

Doppler Tracking Services - Systematic Error Performance, X-Band

LEGS shall provide the standard deviation range-rate systematic error performance of ≤0.25 mm/s on the X-band link, under system conditions that provide a random error performance of ≤0.25 mm/s.

Sought.167

X-Band Doppler and Range Measurement Sampling Precision

LEGS shall provide X-band radiometric measurements with sampling precision of ≤±25ns for each Doppler and Ranging measurement.

Sought.168

Doppler and Range Measurement Time Tag Resolution

LEGS shall provide the X-band Doppler and Ranging measurements with time tag resolution of at least 1.0 ns.

Sought.169

X-Band Doppler and Range Measurement Time Tag Accuracy

LEGS shall provide X-band radiometric measurements with time tagging accuracy of ≤±100ns for each Doppler and Ranging measurement, referenced to the received 1 PPS reference.

Sought.170

Forward Link Frequency Sweep (X- Band)

LEGS shall have the capability to conduct a forward link carrier sweep range and rate as follows for X-Band:

Carrier Sweep Range: ± 1 kHz to ± 500 kHz Carrier Sweep Rate: 1 kHz/s to at least 10 kHz/s (1 kHz/s step size)

Sought.171

Forward Link Frequency Sweep (Ka-Band)

LEGS shall have the capability to conduct a forward link sweep width and sweep rate as follows for Ka-band:

Carrier Sweep Range: ± 1 kHz to ± 2 MHz Carrier Sweep Rate: 1 kHz/s to at least 10 kHz/s (1 kHz/s step size)

Sought.172

X-Band Return Service BER

LEGS shall provide a maximum BER of 10⁻⁵ (Uncoded) and a maximum BER of 10⁻⁸ (LDPC 7/8) for data in the X-Band telemetry channel, referenced to the output of the decoder.

Sought.173

Ka-Band Return Service BER

LEGS shall provide a maximum BER of 10⁻⁵ (Uncoded) and a maximum BER of 10⁻⁸ (LDPC 1/2) for data in the Ka-Band telemetry channel, referenced to the output of the decoder.

Sought.177

Pre-detection Polarization Diversity Combining

LEGS shall provide a selectable (ON/OFF) Pre-detection polarization diversity combining for each frequency band supported by a given LEGS asset.

Sought.178

Mission Data Throughput

LEGS shall provide 1.5 Gbps or greater of simultaneous data throughput for receive and transmit services combined.

Sought.179

Multi-mission Operations

LEGS shall be configurable to simultaneously support the maximum number of events necessary for MSPA, including starting and ending MSPA-related events at different times based on the operational schedule.