GOLDS-UFSC: validate the payload and its interfaces

GOLDS-UFSC is a UFSC SpaceLab mission designed to validate INPE’s Environmental Data Collector, or EDC, using a platform derived from FloripaSat 1. Its mission documentation also describes technology and radiation experiments and amateur-radio relay goals. The broader GOLDS collection system and this individual demonstration mission are different levels of the architecture. They should be connected in the learning map without being merged into a single spacecraft identity.

INPE’s October 2026 catalog calls a related UFSC-led development project EDC-UFSC: a FloripaSat 1-based satellite and ground segment — open definition for testing the Environmental Data Collector. UFSC’s project-agreement record separately names GOLDS-UFSC development and EDC testing. These documents connect the institutions, payload — open definition and platform lineage. They do not justify treating every FloripaSat-2 or Catarina flight as the same spacecraft. Here both documented project names are covered together, while exact flight configurations remain distinct. SpaceLab’s legacy floripasat2-doc repository name likewise does not establish an exact alias for every later flight.

The June 2023 design report includes a March 2022 laboratory test of EDC boards. Initially, the command interface — open definition did not return expected responses. Investigation identified a problem with the signal’s low logic level and considered interference from a shared RS-485 interface. A temporary software change disabled that interface, while the report recommended a more appropriate flight-board solution. The test also decoded the supplied radio packets successfully under its stated setup.

This is a useful troubleshooting lesson because silence on one interface did not establish that every part of the receiver was broken. The team separated command handling from the radio chain and examined the signal at an intermediate boundary. A successful test after a change should retain the board and software versions so the result can be reproduced. A temporary workaround and a verified flight configuration — open definition are not interchangeable descriptions.

Trace one packet through the system

For an original exercise, suppose a receiver decodes 100 known test packets but its control computer records only 92. The missing eight require investigation along the handoff and storage path; the receiver result alone cannot establish complete delivery. Compare identifiers and timestamps at each boundary to locate where the records diverge. Keep the test stimulus known, so the expected result does not depend on guessing what was transmitted.

Laboratory evidence also has environmental limits. Cable-connected radio tests do not reproduce every orbital propagation condition, and a planned validation — open definition mission does not prove that it has flown. The GOLDS-UFSC documentation is valuable precisely because it exposes methods, intermediate findings and remaining work. Build a simple verification table with the input, observation point, expected output and unresolved conditions. That habit turns a promising payload into a system whose performance another team can meaningfully assess.