Detailed technical information
Both the “engineering model” and the “flight model” of the satellite were developed and built by INVAP S.E., CONAE’s main contractor for this mission, which also was in charge of testing the vehicle at its premises in Bariloche, province of Río Negro.
SAC-A On board Instruments
- Differential Global Positioning System (DGPS)
- Panchromatic Camera
- Solar Panels
- Data communication, transmission and processing system
The communications system comprised: the link to and from earth for the transmission of telemetry, the command reception and the transmission of gathered images and magnetic data.
The SAC-A carried an array of four antennas for the GPS system, one antenna on S Band to connect with its operational base, and one more antenna in Very High Frequency (VHF). The two latter antennas were also suitable for transmitting telemetry as well as receiving commands.
The power supply was provided by NiCd batteries which delivered 36 watts, and GaAs deployable solar panels. SAC-A orbit, with its features of circularity (eccentricity less than 5%), plane inclination of 51.6º and an altitude of 389 km, were very suitable for the purpose of obtaining images of Argentina and rest of the globe. Through the planned orbit, it was ensured that the period of useful life of the satellite would be at least six months, time enough to test and qualify all subsystems on board and to achieve the objectives of the mission.