Structure of Coronas-Photon onboard telemetry and command systems
A. Glyanenko
IAF MEPHI, Moscow, Russia
In the talk a structure of onboard data acquisition, preliminary processing and registration of scientific information system and the structure of control for the Coronas-Photon project is discussed. In the Coronas-Photon project some systems for control and data acquisition are used:
- Onboard Complex of Control (OCC) including satellite control devices, satellite onboard computer, onboard time and synchronization system;
- Satellite Telemetry System (STS);
- Scientific Telemetry System (SSRNI);
- Block of control and connections of scientific complex (BUS-FM).
For the control of all scientific devices (SD) of Coronas-Photon the next resources are available:
- Up to 160 pulse commands with duration 0,1-0,3 sec and amplitude that is equals to satellite power;
“dry contacts” – pulse on/off and (switch on)/(switch off) type (OCC→BUS-FM).
- Special commands “shadow/light” and “bad/good’ (location of the satellite in high latitudes or in the SAA region), (OCC→BUS-FM).
- 16-bits digital commands (UKS) to operate by scientific devices (OCC→SSRNI by 1553b-channel).
For data acquisition in Coronas-Photon project the next resources of two telemetry systems are used by SD:
- Satellite Telemetry System (STS) – 131 digital, 34 analogs and 21 thermo-sensors;
- Scientific Telemetry System (SSRNI) with the next possibilities:
- Up to 24 individual information channels for SD with link speed for one channel - 62.5 kbits/s or 125 kbits/s
- Total mass memory up to 1.5 GB, the memory allocation between SD’s is installed according to quotas.
- Additional data from STS throw OCC to SSRNI by 1553b–channel;
- Ground data link with link speed 7.68 Mbits/s or 15,36 Mbits/s at frequency 8,2 GGz (depending on coding algorithm in the link session).
Including into operational network units not only from scientific complex, but all needed units from satellite systems. It is allowed to realize a flexible,
convenient infrastructure for management and data acquisition from scientific equipments and to expand opportunities of experiment.