SOW 128 eLib.pdf

Statement of Work Task: Roman Attitude Ground System Task Order: 128 Task Modification: 4

I. Summary of Changes in this Task Modification

This task modification extends the Period of Performance (POP) and specifies the work to be completed on FDSS-3 Task 128 thru October 31, 2024

II. Summary of Work The objective of this task is to provide technical support for the development of the Roman Space Telescope (Roman) Attitude Ground System (AGS). The task is designed to get the appropriate support from the contractor to help the technical/task monitor (TM) define, develop and document the requirements, architecture, and software design specifications, and operation of the system. The Roman AGS will utilize a customized version of the Multi- Mission Three Axis Stabilized Spacecraft System (MTASS) Government off-the-shelf (GOTS) software. This software is referred to as the Attitude Ground System Software (AGSS) and is typically made of two operational systems: real-time attitude determination system (RTADS) and the attitude determination system (ADS) for offline attitude work. The work during this task period of performance (POP) will be to support the TM in definition of the Roman AGS requirements, design of the overall Roman AGS, including interfaces with other Roman project elements and subsystems. Task work will include development and testing of the software modules for a functional software system, including definition of the generic MTASS software modules to meet the Roman requirements and modifications to the existing MTASS software suitable for the Roman mission. These software modules shall be suitable for integration and deployment on the Roman Mission Operations Center (MOC) computer systems in anticipation of a functional and tested AGSS delivery (AGS Release 2.0) to be delivered to MOC per schedule in section V.

III. Period of Performance The period of performance of this task is from March 27, 2020 thru October 31, 2024. The period during which the work for this task modification shall be performed is from November 1, 2022 thru October 31, 2024.

IV. Subtask Description

a. Subtask 1: Requirements, Design Definition, and Analysis

i. The task personnel shall assist the TM in refining the requirements, design specifications, test plan, and internal/external interfaces of the AGS as part of the Roman Ground System.

ii. Provide technical support to the TM in the detailed design development of the AGS. The support shall include definition of all generic AGS MTASS, as well as Roman mission-specific, modules and system architecture required to meet Roman AGS requirements. This technical support will help the TM properly allocate or map the AGS requirements to the generic and Roman mission-specific MTASS software modules.

iii. In consultation with the TM, the task personnel shall perform AGS analyses, as negotiated with TM, to support the Roman AGS development.

b. Subtask 2: System Development and Software Support

i. In consultation with the TM, task personnel shall configure and support the deployment and setup of the AGSS. This includes appropriate generic MTASS utilities, which when integrated with the Roman mission-specific utilities, will comprise a functional Roman AGS software system to be delivered as “AGS Release 2.0”. This release will incorporate and update all functionalities associated with AGS Release 1.0 (completed and delivered in prior POP) including telemetry ingest and processing, data adjustment, attitude sensor calibration utilities, definitive attitude determination, AGS trending, and other utility functions (e.g. ephemeris ingestion) as required for the functionality necessary to meet the AGS requirements for MOC Build 2.0.

ii. In consultation with the TM, task personnel shall configure and support the deployment and setup of the AGSS. This includes appropriate generic MTASS utilities, which when integrated with the Roman mission-specific utilities, will comprise a functional Roman AGS software system to be delivered as “AGS Release 2.0”. This release will include ingest of SOC predicted Attitude Profile, RTADS, predicted attitude generation, ingestion of Solar Radiation Pressure (SRP) Report, attitude targeting and slew planning utilities, ingestion of FDOA Orbit Maneuver Params, attitude target generation, system momentum management utilities, Fuel Mass product ingest, Momentum Management Plan and Momentum & Maneuver Param generation, attitude-related constraint checking, updates to all functionality delivered in AGS Release 1, and other utility functions as required for the functionality necessary to meet the AGS requirements for MOC Build 2.0.

AGS Release 2.0 will be delivered in this POP, as specified in sec V. Table of Deliverables.

iii. In consultation with the TM, task personnel shall provide assistance in the overall AGS software design, which will include coding, analysis, and pertinent testing, of Roman mission-specific utilities of the MTASS required for both real-time and offline ground attitude work. The work under this task shall focus on the AGSS development items, as listed below:

1. RTADS data interface unit (DIU) and ADS telemetry processor (TP) functionalities of the MTASS for processing of real-time and offline/playback telemetry data from the Roman spacecraft, respectively. The work on common telemetry processor during this POP will include requirements, design, and coding since this functionality is required for AGS Release 2.

2. RTADS utility to perform attitude determination and related attitude performance monitoring functions in real time using telemetry acquired through a real-time DIU. RTADS shall provide a set of real-time updated graphical and tabular data displays of attitude estimates, attitude residuals, and attitude sensor parameter data sufficient to facilitate rapid assessment of the Roman attitude system performance.

3. ADS ground-based attitude determination, ephemeris ingestion, definitive attitude, validation, and trending utilities to perform validation of onboard Roman attitude solutions and related parameters using independently computed attitude solutions from available attitude sensor telemetry. The work on ADS ground-based attitude determination, ephemeris ingestion, definitive attitude, validation, and trending utilities during this POP will include updates as need to AGS Release 1 to provide full functionality.

4. Slew planning utility, including attitude constraint checking utilities, required to produce all Roman AGS attitude products and support the planning and modeling of all Roman attitude commands and slews.

5. Attitude sensor calibration utilities to provide fully functional system for calibration of required Roman attitude sensors. The work on Attitude sensor calibration utilities during this POP will include updates as needed to AGS Release 1 to provide full functionality.

6. Attitude Predication and Constraint checking utilities for each type of mission-specific attitude command or slew. Predictions include constraint checking (e.g. Sun avoidance and Star Tracker Occultation checks).

7. Spacecraft Momentum prediction utility, including development and integration of a high-fidelity model of spacecraft disturbance torques, for the purpose of planning momentum unloading operations.

8. High Gain antenna on-orbit calibration utility. This calibration will be performed by pointing the HGA at a TDRS satellite forward link over a wide range of gimbal angles and with specified offsets while measuring the received power as a function of the gimbal angles and offsets. During this POP task personnel shall define requirements, scope of effort, expected accuracy, and on-orbit resources (such as HGA availability or required data products) necessary to achieve required accuracy. The work on the HGA on-orbit calibration utility will be primarily focused on requirements, design, and some coding since this functionality is required for AGS Release 3 to be delivered in the next POC.

9. Other software modifications for development of a functional AGS system necessary to meet Roman requirements.

iv. In consultation with the TM, task personnel shall provide unit testing of all Roman mission-specific utilities of the MTASS required for both real-time and offline ground attitude work as part of the AGSS. Each unit test will be documented in the manner agreed upon with the TM.

v. In consultation with the TM, task personnel shall provide algorithm design documentation for new Roman mission-specific software items. Task personnel shall present this algorithm design documentation to the AGS team for review prior to completing the development of this item.

vi. In consultation with the TM, after a particular Roman mission-specific software item development is complete, task personnel shall support Code Walkthroughs in adherence with Roman Ground System requirements, which will include review of unit testing.

vii. In consultation with the TM, as negotiated with Roman project personnel, task personnel shall begin work on any AGS software enhancements and/or bug fixes that may be identified during the Roman AGS development in this

POP.

c. Subtask 3: System Testing, Delivery, and Operational Support

i. In consultation with the TM, task personnel shall define system scenario test plans and procedures for the functional AGS software system, in preparation for Factory Acceptance Testing (FAT) of the AGS Release 2.0 software.

ii. In consultation with the TM, task personnel shall define system scenario test plans and procedures for the functional AGS software system, in preparation for MOC site acceptance testing (SAT) of the AGS Release 2.0 software.

iii. The task personnel shall deliver a functional and operational AGS system (AGS Release 2.0), that includes functionality specified in Subtask 2 for AGS Release 2.0, for integration with the MOC computer systems, per the delivery schedule in section V.

iv. In consultation with TM, task personnel shall support pre-delivery AGS testing for AGS Release 2.0. These tests shall fully verify all AGS Level 5 requirements, pertinent to AGS Release 2.0, where verification method has been designed as "test", or by "demonstration" as appropriate.

Documentation of test results will be delivered to MOC computer systems per the delivery schedule in section V. As part of this delivery a test matrix will be included that documents successful test verification and method for all AGS level 5 requirements.

v. In consultation with the TM, task personnel shall, with input from the TM and the Roman project personnel, begin work to support Roman AGS operations planning.

d. Subtask 4: Documentation, Reviews, Task Meetings and Reporting

i. The task personnel shall assist the TM in developing and reviewing any type of required documentation for the Roman AGS and overall Ground System.

The required documentation support for the AGS includes updates to Level 5 AGS requirements and related Level 4 MOC requirements, AGS design specification, Internal MOC ICD, AGS test plan and related sections within Roman ground system test plans, AGS test and operational procedures, Flight Operations Review (FOR) Engineering Peer Review (EPR), or AGS

Walk-through for Mission Operations Review (MOR), Table Top presentations, etc.

ii. Provide support and presentation materials for any internal, Ground System or Project reviews that require AGS participation. In particular, the Flight Operations Review (FOR) Engineering Peer Review (EPR), or AGS Walk-through for Mission Operations Review (MOR).

iii. Participate in meetings related to the Roman AGS development as requested by the TM.

iv. Provide a brief report summarizing the cost, schedule and technical activities during the calendar month, submitted by the 15th day of the succeeding month.

v. Provide the documentation, reports, reviews, memorandums, and analyses on topics and with the delivery dates as requested by the TM or included in section V. Deliverable Items and Schedules

V. Deliverable Items and Schedules At a minimum, the contractor shall deliver the items specified below.

Table of Deliverables

Deliverable Due Date Description

Documentation As requested and negotiated with TM

AGS Requirements, Analysis Reports, Design Specifications, and AGS Test Plans and Procedures, AGS sections to be included in MOC design spec, test plan, and Internal MOC ICD, and presentation materials for Roman AGS Table-top reviews and CDR.

Roman AGS software As requested and negotiated with TM

Roman mission-specific software utilities being developed by the task personnel.

AGS Release 2.0 functional software March 13, 2024 AGSS Fully-Functional Release, including functionality listed in Subtask 2 for this release

AGS Release 2.0 test plan and procedures

March 13, 2024 AGSS Fully-Functional Release, including functionality listed in Subtask 2 for this release

AGS Release 2.0 user’s guide March 13, 2024 AGSS Fully-Functional Release, including functionality listed in Subtask 2 for this release of, technical quality of deliverables, cost control, significant events, innovations and meeting requirements set forth in the SOW.

VIII. 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.

IX. Travel Local travel is expected during this performance period between contractor’s facility and NASA Goddard Space Flight Center in Greenbelt, MD.

X. 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.

XI. 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 coordinated with the TM. Spending will be tracked at the subtask level. The contractor shall provide a separate 533 for each Subtask.

XII. 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.

XIII. Rights REQUIRED: The Contractor shall adhere to the RIGHTS IN DATA – general (FAR 52.227-14) Alternate II (2007 and Alternate III (2007), as modified by NFS 1852.227-14 (APR (2015).

XIV. References