GOMS information supplied at CGMS 1991 (Co-ordination Group for Meteorological Satellite) ---- Space System with Geostationary Meteorological Satellite (GOMS) VNIIEM (The All-Union Research Institute of Electromechanics) NPO Planeta Moscow Nov, 1990 1 System outline, status and plans 1.1 System Outline The space system includes a geostationary operational meteorological satellite (GOMS) located in orbit at the stationary point over 76 degrees East. The ground data receiving and processing complex consists of the main data receiving and processing (Moscow) and the regional receiving and processing centres (Tashkent and Khabarovsk). 1.2 Status and Plans The first GOMS flight model is completed and undergoes ground qualification tests. The satellite is scheduled to be put into orbit bu the carrier rocket "Proton" for the end of 1991 or the beginning of 1992. The ground centre equipment has been installed and the system debugging is carried out now. 2. Space system objectives - To acquire, in real time, television images of the Earth surface and cloud cover within a radius of 60 degrees at the sub-satellite point in the visible and IR regions of the spectrum. - To measure temperature profiles of the Earth of the Earth surface (land and ocean) as well as cloud cover. - To measure radiation state and magnetic field of the space environment at the geostationary altitude. - To transmit via digital radio channels television images, temperature and radiation and magnetometric information to the Main and Regional data receiving and processing centres. - To acquire the information from Soviet and International data collection platforms (DCPs) located in the GOMS radio visibility and to transmit the obtained information to the main and regional data and processing centres - To retransmit the processed meteorological data in the form of facsimle or alphanumerical information from the receiving and processing centres to the independant receiving stations via the satellite. - To provide the exchange of high-speed digital data (retransmissions via the satellite) between the main and regional centres of the USSR State Committee for Hydrometeorology. - To call for the data collection platforms to transmit the information to the satellite. 3. Satellite and Equipment characteristics. Satellite mass - 2,400 kg Including payload - 800 kg Satellite orientation - Three axis, to the Earth and along the velocity vector with the error not more than 2 arc minutes Angular velocity stabilization accuracy - not more than 0.0001 deg/sec Power - not less than 1500 W (average, per day) including payload power consumption up to 900 W. Lifetime - not less than 3 years 3.2 Information on system components and their characteristics 3.2.1 Scanning television radiometer (STR) Spectral bands - visible 0.46-0.70 micrometre - infra-red 1 10.5-12.5 micrometre - infra-red 2 6-7 micrometre (beginning with GOMS 2) Number of scan lines per frame - visible 8000 - infra-red 2500 IFOV - visible 31.5 microradian - infra-red 160 microradian Ground resolution - visible 1.25 Km - Infra-red 6.50 Km The imaging session frequency is not less than 30 minutes and the lenght of one take (frame time) is 15 minutes. Direct data transmission rate is 2.56 Mbps 3.2.2 Radiation-measuring and magnetometry system The system is designed to control the penetrating radiation spectra and density in the near-Earth space and the Earth magnetic fiels state. The system records the following heliogeophysical information (HGI) - the density of electron fluxes with energies in four bands from 0.04 MeV to 1.7 MeV. - the density od alpha particles with energies from 5 MeV to 12 MeV. - intensity of galactic cosmic radiation with energies greater than 600 MeV. - solar X-ray radiation intensity with energies from 3 keV to 8 keV. - intensity of solar UV radiation in four wave bands up to 1300 mm. - magnetic induction vector component quqntities along the three axis with +/- 180 nT inteval. 3.3.3 Satellite communication links characteristics Radio channels 1 and 2. Transmission of television images and heliogeophysical information from the satellite to the receiving and processing centres (RPC) Frequencies 1685 MHz and 7465 MHz respectively Data rate 2.56 Mbps Radio channel 3. Transmission of information from fixed and mobile data collection platforms (DCPs) to the satellite in the band 401 to 403 MHz. Transmission of data is possible through 33 international and 100 Soviet channels at rates of 100 bps. Radio channels 4 and 5. Transmission of the information obtained from DCPs to the receiving and processing centres via the satellite. Frequencies 1697 +/- 1 MHz and 7482 +/- 1 MHz Radio channels 6 and 7. Transmission of facsimile information in standard WEFAX format and alphanumerical data from receiving and processing centres to the satellite. Frequencies 2155 +/- 1.5 MHz and 8155 +/- 1.5 MHz Data rate 1200 bps Radio channel 8. Retransmission of facsimle and alphanumerical data from the satellite to independent receiving stations in the band 1691+/-1.5 MHz. Radio channel 9. Transmission of high-speed digital information from RPC to the satellite. Frequency 8190 +/- 5 MHz Data rate up to 0.96 Mbps Radio channel 10. Transmission of high-speed digital information from the satellite to the RPC. Frequency 7465 +/- 2.5 MHz Data rate up to 0.96 Mbps Radio channel 11. Calling for DCP from the satellite Frequency 469 +/- 1 MHz Radio channel 12. Transmission of DCP request from RPC to the satellite Frequency 2110 +/- 1 MHz 3.2.4 Data receiving and transmission modes Channels 1 and 2 operate 24 to 48 times per day and each session lasts for 15 minutes Channels 3, 4 and 5 operate unde the command to call for the DCP information Channels 6, 7 and 8 operate continuously. Channels 9 and 10 function in the interval when channels 1 and 2 are not active. Channels 11 and 12 operate when needed