- GSAT01XX: IOV satellites
- GSAT02XX: FOC satellites
SV ID (PRN) : Space Vehicle (SV) Identifier is the Galileo satellite ranging code identifier. ‘E’ is the Galileo system constellation indicator.
Cospas-Sarsat ID: Satellite ID code number is a unique 3-digit number allocated by Cospas-Sarsat for each operating, SAR-equipped satellite, comprised between 400 and 499 for Galileo (as defined in document C/S A.002, https://cospas-sarsat.int/en/documents-pro/system-documents)
Operating Mode: The Galileo SAR Repeater (SARR) can operate in two gain and two bandwidth modes. The operational modes include the Normal (90 kHz) and Narrow (50 kHz) bandwidth modes, as well as the possibility to operate with adjustable Fixed Gain (FGM) or Automatic Level Control (ALC) mode. The operational modes of the SAR Repeater are therefore:
1. ON mode
- ALC (Automatic Level Control): The transponder gain is self-regulated to ensure stable EIRP (Equivalent Isotropically Radiated Power). The operational gain is automatically adjusted to obtain a predefined power at the output of the SAR transponder. Thus the values are:
- ALC90: 90 kHz BW (Normal bandwidth mode, preferred and default mode)
- ALC50 : 50 kHz BW (Narrowband mode)
- FGM (Fixed Gain Mode): The transponder gain is set by tele command in a 30 dB range, with nominal step of 1 dB. The range is adjusted so that when the transponder is in the 90 kHz bandwidth mode, and at the input of the repeater there is only thermal noise, the nominal output power of 7 dBW is achieved for a gain step of 22 dB. Then, the overall gain of the SAR repeater in the reference gain setting in FGM (including the gains of the receiving and transmitting antennas) is around 182 dB at the edge of coverage.
- FGM90: 90 kHz BW (Normal bandwidth mode, preferred and default mode)
- FGM50 : 50 kHz BW (Narrowband mode)
2. STANDBY mode: SAR repeater is powered up, but Radio Frequency (RF) power is OFF.
3. OFF mode: SAR instrument not powered up.
The following table summarises the available options:
Wideband filter and automatic level control (WFA)
Narrowband filter and automatic level control (NFA)
Wideband filter and fixed gain (WFG)
Narrowband filter and fixed gain (NFG)
|OFF||Both Stand-By and OFF modes|
No SAR instrument on-board
FLS (Forward Link Service) Operational Status: The FLS Operational Status reflects the SAR Transponder availability for the Search and Rescue Mission. The following are the values considered:
- NOT APPLICABLE (N/A): the satellite is not fitted with a SAR instrument on-board.
- UNDER TESTING (UT): the SAR instrument is undergoing in-orbit testing.
- INITIAL OPERATIONAL CAPABILITY (IOC): the SAR instrument is commissioned by the Galileo Programme and used in Operations, but the commissioning report is not yet approved by Cospas-Sarsat.
- FULLY OPERATIONAL (F): SAR instrument commissioned by both the Galileo and Cospas-Sarsat Programmes.
- OFF: SAR instrument turned off.
RLS (Return Link Service) Operational Status: The RLS Operational Status reflects the satellite availability to support the Return Link Service. The following are the values considered:
- USABLE: satellite is operational and contributing to the service provision.
- NOT AVAILABLE: satellite is not operational and it is not contributing to the service provision (NAGU issued prior to Service Declaration).
- NOT USABLE: satellite is not operational and it is not contributing to the service provision (NAGU issued after Service Declaration).
- TESTING: satellite may be used only for testing purposes.
- UNDER COMMISSIONING: satellite is under In-Orbit Test (IOT) phase.