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This table contains examples of downlink frequency assignments; Satellite Frequency Band Terra: 8212.5 MHz: 8175-8215 MHz METEOROLOGICAL-SATELLITE SERVICE Earth exploration-satellite service Aqua: 8160 MHz: 8025-8175 MHz: Earth exploration-satellite service NOAA 17,18 1707 MHz 1700-1710 MHz: Meteorological-satellite service: ERS-2 (High rate ...
A radio link from an earth station at a given location to a space station, or vice versa, conveying information for a space radiocommunication service other than for the fixed-satellite service. The given location may be at a specified fixed point, or at any fixed point within specified areas.
The GSAT-7A, with a mission life of 8 years, is also equipped with the payload of 10 Ku band transponders, [6] which offers several advantages over c-band, such more powerful satellite uplink and downlink signals, smaller antennas, and non-interference of communication signals with terrestrial microwave systems. Payload: [11] [12] [13]
The frequency differences observed are due to different Doppler shift resulting from relative satellite motion and differences in the translation frequencies of the two satellite channels. Channel translation frequencies and downlink Doppler shift and delay can be calibrated out of the measurements by observing transmitters of known location ...
The Lunar Communications Relay Unit (LCRU) on the Lunar Rover (Apollo 15, 16, 17) had its own downlink frequency (to avoid interference with the LM) but shared the LM's uplink frequency as it did not implement a coherent transponder. Separate voice subcarriers were used on the common S-band uplink, 30 kHz for the LM and 124 kHz for the LCRU, so ...
The satellite in turn, will be receiving the uplink signal at a higher frequency than normal so the ground station's transmitted uplink frequency must be lower to be received by the satellite. After the satellite passes overhead and begins to move away, this process is reversed.