Satellite communication forward feed link Doppler frequency difference elimination method and system
A technology of Doppler frequency difference and feeder link, which is applied in the field of Doppler frequency difference cancellation in the forward feeder link of satellite communication, can solve the problem that the Doppler frequency difference cannot be eliminated, and reduce the load complexity. , The effect of reducing the amount of equipment and the method is simple and easy to implement
Active Publication Date: 2018-10-19
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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Problems solved by technology
For the forward feed link transmission with only one ground transmitting station, the Doppler frequency difference between the channels transmitted through the ground transmitting station can be eliminated by increasing the pilot frequency, but multiple ground transmitting stations communicate with satellites Doppler shift cannot be eliminated in this way
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Embodiment
[0035] Embodiment: This embodiment takes two ground transmitting stations, a ground transmitting station 2 and a ground transmitting station 3, and a ground control center 1 as examples. The ground control center 1 includes an amplitude-phase weighting processor 11; the ground transmitting station 2 includes a frequency division multiplexer 21 and a ground transmitting antenna 22; the ground transmitting station 3 includes a frequency division multiplexer 31 and a ground transmitting antenna 32; the satellite includes Two sets of identical equipment correspond to two ground transmitting stations, and the satellite terminal 4 includes on-board receiving antenna 41 and on-board receiving antenna 46 of corresponding signal processing channels, demultiplexer 42 and demultiplexer 47, analog Quadrature downconverter 43 and analog quadrature downconverter 48, pilot receiver 44 and pilot receiver 49, local oscillator synthesizer 45 and local oscillator synthesizer 410, the common part ...
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The invention relates to a satellite communication forward feed link Doppler frequency difference elimination method. According to the method, ground transmitting stations modulate corresponding N / M channel signals and pilot signals to different frequency points, perform frequency division multiplexing to obtain FDM signals, send the FDM signals to a satellite; at a satellite end, de-multiplexingis performed on the FDM signals in corresponding signal processing channels through local oscillation signals in the channels so as to obtain corresponding N / M channel signals, the N / M channel signalsin the corresponding signal processing channels are down-converted to zero intermediate frequency through the local oscillation signals, so that N / M pairs of zero-intermediate-frequency IQ signals can be obtained; and therefore, the problem of the feed link transmission problem of a ground beamforming-based satellite system through a plurality of ground transmitting stations can be solved; and the plurality of ground transmitting stations can jointly perform beamforming. The Doppler frequency difference elimination method of the present invention is simple and easy to implement; and the equipment capacity of the whole system is decreased, and load complexity is decreased.
Description
technical field [0001] The invention relates to a method and a system for eliminating Doppler frequency difference of a satellite communication forward feed link. Background technique [0002] In a multi-beam satellite communication system based on ground beamforming, the beamforming amplitude-phase weighting processing of each forward channel signal corresponding to the on-board feeder is completed at the ground transmitting station, and then the data of multiple forward channels are usually divided by frequency The multiplexing method synthesizes a wideband frequency division multiplexing (frequency division multiplexing, FDM) signal and transmits it to the satellite through the forward satellite-ground feeder link. When the number of channels is large and a single ground transmitting station cannot complete the transmission, two or more ground transmitting stations are required to transmit the channel signal to the satellite synchronously. After the satellite receives th...
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IPC IPC(8): H04B7/185H04L5/00
CPCH04B7/18508H04B7/1855H04L5/0048
Inventor 王庆华吴瑞荣黄蕾张正宇
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST