Satellite on-board switching system with satellite-to-satellite link

摘要: A Space Division Multiple Access (SDMA) Communications satellite system which utilizes a pair of communications relays having link between them. Each includes plurality receive spotbeam antennas are selectively connected to transmit by an on-board switching matrix under control oscillator. antenna communicates with different geographical zone one or more earth stations. station may communicate all other stations in the including those within field view aboard satellite. In order maintain synchronization satellites, designated reference transmits burst four sequential unique words its view. The is related and back again first where it relayed station. Relative phase drift satellites' respective oscillators detected at as failure detect fourth word. Improper propagation delay due distance variation satellites second third word during predetermined time period. Oscillator corrected changing frequency and/or oscillator through telemetry circuitry facility be adding subtracting path use variable pads remotely controlled signals from facility.