Req. 5.3.11.3.3: "Process Attitude Data"

The FSW shall process the attitude information from the SC, in order to include GRB location information in the LAT GRB Alert Message to SC.

Basis (help)

[Derived]

Context (help)

Test(s)

010a: LAT Pointing Calculations

This test shall verify that the SIU FSW can promptly transform pointing vectors reconstructed from event data between the LAT-relative coordinate system and the celestial coordinate system. The transformation shall be based on GPS, attitude, and orbit information provided by the S/C and the event time tag read in with each event. Using simulated events and simulated SC time/attitude data, the test will demonstrate the accurate reconstruction of the Monte Carlo-provided primary particle vector, in celestial coordinates.

012b: Additional Science Processing - Repointing Logic

This test verifies the LAT's internal logic for requesting repointing for LAT-detected GRBs. Verification shall include a variety of scenarios, including repointing enable, different operational modes, and conflicting requests. The test shall verify that the SIU FSW responds to these events properly, forwarding repointing requests to the SC, sending a command indicating the time of GRB detection, and (for a LAT-detected burst alert) issuing a LAT closeout message to the GBM.