GPX-2 Spacecraft

Novel test-bed for Commercial Off-the-Shelf (COTS) differential global positioning systems (dGPS).

Technology demonstration mission that will provide a novel test-bed for Commercial Off-the-Shelf (COTS) differential global positioning systems (dGPS) that will enable future on-orbit assembly, docking, and formation-flying small satellite missions. While on-orbit, it will assess the capability of unmodified, multi-frequency COTS dGPS receivers. One receiver will operate as a base reference as well as assess absolute position accuracy from an on-orbit COTS receiver.

Table (missing from the paper) contains the temperature values for temperatures on 1 August 2022, about a month after launch, and then for 22 December 2022, almost 6 months after launch. This captures the temperatures experienced by the spacecraft during a time of low solar flux and a time of high solar flux.

Following the launch, the thermal model was modified with temperature measurements placed in locations near the actual flight thermistors. This allowed for evaluating predictions from the thermal model that would match with the flight thermistors. Cases were run with orbital parameter matching ephemeris data collected form the NORAD database that tracks all satellites on the day that the on-orbit temperatures were collected for 1 August 2022. The temperatures that were collected from orbit are within the range predicted from the thermal model.

• CTIM FD
• GPX-2
• Gunsmoke-L
• MISR-B
• NACHOS 2
• Recurve
• Slingshot-1