SOW 146 eLib.pdf

Statement of Work Task: Lunar Mission Design and Navigation Support Task Order: 146 Task Modification: Mod 4

I. Summary of Changes in this Task Modification

This task modification extends the task period of performance to September 30, 2024 for SubTask 2 and adds GEONS software development scope to both SubTask 1 & 2.

II. Summary of Work This task is designed to provide Flight Dynamics support to the Navigation & Mission Design Branch (Code

595) at GSFC for upcoming projects under the Artemis Campaign Development and Space Communication and Navigation. The two current projects included in this task are EHP Navigation (EVA Human mobility Program) and LunaNav System (LNS).

The EHP program was instantiated in 2022 at NASA Johnson Space Center to oversee and coordinate across three major lunar surface exploration projects: Extravehicular Activity (EVA), Lunar Terrain Vehicle (LTV) and Pressure Rover (PR). The Navigation and Mission Design Branch at GSFC is providing navigation systems support to the EHP program. The support will focus on navigation-related tool development and associated analyses to help defined, assess, and implement adequate lunar surface navigation solutions for Artemis 3, 4, 5 and beyond.

LNS is a SCaN initiative to investigate a global lunar navigation architecture with a phase deployment starting in 2030. LNS is currently in pre-Phase A and has completed a first Mission Design Lab (MDL) study in January 2023 and an Instrument Design Lab (IDL) study in June 2023. A preliminary LNS system concept review occurred on September 21, 2023, and this task mod addresses support priorities following that review.

The contractor shall expect to work in collaboration with NASA as well as NASA’s partners in other government agencies, industry, academia, and other contractors in the accomplishment of the technical objectives of the task. As work results are evaluated or changes to mission trades occur, work priorities may change. The contractor shall be expected to provide timely support of unplanned high-priority actions as circumstances dictate to support EHP and LNS, as negotiated with the TM.

III. Period of Performance The period during which the work for this task shall be performed is between March 31, 2023 and September 30, 2024.

IV. Task Description Task 1. EHP Navigation Systems

1.1 Lunar Surface Traverse Simulation Tool Development

1.2 Lunar Surface Traverse Simulation and Analysis

1.3 GEONS Development and Testing for Surface Navigation Analysis

Subtask 1.1: Lunar Surface Traverse Simulation Tool Development Task Scope: This subtask focuses on surface traverse tool development to be used in the analysis subtask. Some analysis parallel effort may be possible with lower fidelity traverse modeling.

Technical Requirements: In this subtask, the contractor shall:

• Continue development of tool to simulate surface traverse from location A to location B with waypoints on the lunar surfaces.

o The tool shall be built with increasing level of fidelity from ingesting a traverse from a file, to being able to generate a traverse using hi-resolution DEMs.

o The tool shall compute illumination conditions, altitude change and line of-sight to various assets/features/planets/Stars in orbit and on the surface during the traverse.

o The tool shall be able to model sensor observables and associated error model and estimation process to derive an orientation and position solution.

• GEONS Code Update o Identify and provide specification for GEONS code updates needed for surface navigation analysis

Skill Requirements: This subtask requires subject matter expertise in GNC, GNC sensor models and overall software/programming experience. Skill requirements may be negotiated with the TM.

Subtask 1.2: Lunar Surface Traverse Simulation and Analysis Task Scope: This task will perform 4-DOF or 6-DOF analysis of a user on the Moon’s surface with various combinations of observables and under various traverse scenarios.

Technical Requirements: Simulations will cover, but not be limited to, the following scenarios and observables:

• Traverse Scenarios: 1) traverse to multiple waypoints; 2) return to lander 3) Crew separation and rendezvous and 4) vehicle cooperative traverse.

• Navigation Sources Sun/Sun Sensor, Stars/Star Tracker, Inertial Measurement Unit (IMU), Light Detection and Ranging (LiDAR), Camera (Horizon, TRN), lunanet orbital nodes, 3GPP towers

• Traverse area evaluation such as slope, illumination or line -of-sight to lander (This analysis is lower priority as compared to navigation performance evaluation)

For each simulation, various set of metrics will be gathered such position and orientation knowledge errors, time for a fix/updates, instantaneous planned altitude versus actual altitude of the traverse, planned walked distance versus actual walked distance, planned illumination versus actual illumination, planned traverse versus actual traverse due to execution errors, etc. The simulation ground rules and assumptions, analysis procedure along with the expected output, shall be captured by the contractor in a document (presentation or memorandum).

Skill Requirements: This subtask requires a navigation SME with 6-DOF estimation, Earth navigation algorithm background preferably independent of GPS observables.

Subtask 1.3: GEONS Development and Testing for Surface Navigation Analysis

Task Scope: The task will update the GEONS software to enable surface user navigation analysis for systems using LunaNet provider signals and/or an inertial measurement unit.

Task Requirement: This task will cover the following activities:

• Update of GEONS software following GEONS configuration management process to allow acceleration and orientation measurements, including noise standard deviations, to be ingested and considered in the propagation of to propagate a moving surface asset state and covariance

• Update the GEONS math specification and requirements according to the software updates

• Development and execution of unit testing scripts associated with the software updates

• Development and execution of system level testing scenarios associated with the software updates

Skill Requirement: This subtask requires subject matter expertise in GEONS software development as well as sensor & measurement models.

Task 2. LunaNav System

2.1 Constellation and Mission Design

2.2 Navigation Analyses

2.3 GEONS Development and Testing for Surface Navigation Analysis

Subtask 2.1: Constellation and Mission Design

Task Scope: This subtask focuses on constellation design and associated orbits to meet global lunar or extended coverage with specific performance metrics such as, but not limited to, GDOP and constellation maintenance delta-velocity. The current task scope will be limited to the deliverables listed in Task 2 deliverable unless directed otherwise by the TM.

Technical Requirements: In this subtask, the contractor shall further investigate constellation and orbits which meets LunaNav System requirements including but not limited to:

• Orbit optimization & metrics definition for the multiple nodes in the distributed system:

o Constellation contact analysis and modelling, including intra-constellation through inter-satellite links, as well as constellation links to users in the service volume;

o Constellation design and assessment tool development, as needed.

• Constellation and Orbit Station keeping design

• Delta-V budget analysis and overall maneuver operations concept

• Maneuver effect on constellation service and intersatellite link availability and metrics

Skill Requirements: This subtask requires subject matter expertise in mission design for cis-lunar and lunar orbits. Overall GNC experience and overall spacecraft systems knowledge and experience are strongly desired. Experience with FreeFlyer and Python are required. Experience with EMTG is also valuable for the transfer trajectory design. Skill requirements may be negotiated with the TM.

Subtask 2.2: Navigation Analysis Task Scope: This subtask focuses on navigation and engineering analysis support on the navigation of the LunaNav System spacecraft nodes, the monitor segment, and the user in the service volume.

Technical Requirements: In this subtask, the contractor shall perform the following activities:

• Assess expected individual constellation node navigation performance depending on the available observables. Observables may include data sets from direct to Earth metric tracking (1-way uplink and 2-way), OpNav (limb/centroiding and/or terrain relative navigation), lunar surface elements, weak-signal Earth-based GNSS, accelerometers, star cameras, and intersatellite crosslinks.

• Assess expected user navigation performance for different constellation configurations, including available time & frequency references, different observable sets, orbit or location options, and maneuvers or attitude changes.

• Determine navigation performance improvements from adding surface navigation assets, with documented assumptions on asset parameters.

and scenarios, along with test result report.

Navigation Performance for the updated Mission Design Lab #1 constellation configuration for surface user (Presentation)

January 15, 2023 Assumes the code update is completed by December 21, 2023. Establish navigation performance for a user on the Moon surface. This work is dependent on the GEONS software update in Deliverable above.

Space Vehicle (SV) Navigation Performance using SV-to-SV Crosslink Measurement

December 30, 2023

Space Vehicle (SV) Navigation Performance using Two-Way Time Transfer

January 15, 2024 A GEONS code update may be needed for this analysis.

Document ops con/use case and GEONS modifications required for simultaneous estimation of orbiting constellation and surface monitor & control assets

January 30, 2024

Perform simultaneous estimation analysis of LNS orbital SV and surface assets

TBD This analysis is dependent on the GEONS modification required and associated level of effort.

Table of Milestones for Task 2

Milestone Due Date

Description

PPBE26 Budget Process Feb 15, 2024 Analysis from task informs system requirements and functionality needed to define budget.

VI. Management Approach

2.4 Staff Allocation, Expertise, and Skill Mix

The contractor shall staff this work item with the appropriate skill mix and staffing level for the work.

2.5 Configuration Management

Systems and documents will be covered under the EHP Configuration Management Plan.

2.6 Facilities

Appropriate IT devices to support the analyses, specification development, and report development are required. It shall be the contractor’s responsibility to provide and set up local workstations and network connections at the contractor’s off-site facilities as required, and to install any required tools and utilities on the contractor’s equipment.

2.7 Risk Management and Best Practices

The contractor shall manage schedule, cost, and technical risk through monitoring and reporting of progress and performance metrics, identifying issues well in advance of negative consequences, recommending corrective action to the TM, and implementing corrective actions with the compliance of the TM.

2.8 Performance Metrics N/A

2.9 Government Furnished Facilities, Equipment, Software and Other Resources

The Government will provide account and passwords to government-furnished workstations where existing versions of various relevant software packages shall be maintained. It shall be the contractor’s responsibility to complete any GSFC required security-related training courses.

VII. Travel There is no non-local travel for this SOW.

VIII. Work Location This work shall be performed primarily at the contractor’s facility, but the contractor may be required to perform some work at the Goddard Space Flight Center.

IX. Reporting Requirements The contractor shall report status in person or via teleconference to the TM or designated alternates on a monthly basis. Reports shall include informal presentation of interim results, status of development activities, and action item status. The contractor shall provide all reports at least one day in advance of the monthly meeting via email, and maintain an email distribution list with the concurrence of the TM. The contractor shall also support the TM in the preparation of status reviews for internal and external funding agencies. The contractor shall comply with any and all additional requests for status meetings and reports. The contractor shall deliver all documents in portable document format (PDF) electronic form to the GSFC NMDB online library, as directed by the TM.

X. Security Requirements This task shall comply with IT security requirements as documented in the FDF IT security plan for all systems located in the FDF. FDF systems shall be maintained under the FDF Sustaining Engineering Task. Systems located outside of the FDF shall be covered under the Code 590 security plan and the Code 590 sustaining engineering support or the contractor sustaining engineering support depending on system location.

XI. Rights REQUIRED: The contractor shall adhere to the RIGHTS IN DATA – special works (FAR 52.227-17) as modified by NFS 1852.227-17. OR

REQUIRED: The contractor shall adhere to the RIGHTS IN DATA – general (FAR 52.227-14) as modified by NFS 1852.227-14, Alternates II and III.

XII. References