Signal demodulation processing plate for satellite communication gateway station

Abstract

The invention discloses a signal demodulation processing plate for a satellite communication gateway station, including an intermediate frequency signal receiver. The intermediate frequency signal receiver is connected with at least two A / D converters, one A / D converter is directly connected with an FPGA unit, and the rest A / D converters are all connected with a DDC. The DDC is connected with the FPGA unit. The FPGA unit is connected with a DSP unit and a communication interface. The FPGA unit comprises a numerical control oscillation module. The numerical control oscillation module is connected with a cascaded integrator comb filter module. The cascaded integrator comb filter module is connected with a halfband filter module. The halfband filter module is connected with a channelization poly-phase filterbank module. The signal demodulation processing plate for the satellite communication gateway station utilizes the FPGA to achieve the DDC function, and the FPGA unit is internally provided with a channelization poly-phase filterbank, thereby achieving multi-channel signal simultaneous processing on the basis of not increasing the processing plate structure.

Description

technical field [0001] The invention relates to the technical field of satellite mobile communication signal exchange, in particular to a satellite communication gateway signal demodulation processing board. Background technique [0002] Satellite mobile communication is the communication between radio communication stations on the earth (including the ground and the lower atmosphere) using satellites as relays. The satellite acts as a relay station in the air, amplifying the electromagnetic wave sent by the earth station and then sending it back to another earth station. The gateway station is the link formed by the satellite system. The function of the gateway station is mainly to provide the interface between the satellite mobile communication system and the ground fixed communication network and the ground mobile communication network to realize interconnection; control the satellite mobile terminal to access the satellite communication system , and ensure that the sign...

AI Technical Summary

Problems solved by technology

The traditional DDC digital down-converter does not consider the decimation and filtering of bandwidth signals, and the processing bandwidth cannot meet the requirements of broadband multi-channel, and can only configure filters and decimators in limited combinations, resulting in the structure of signal demodulation processing boards in satellite communication gateway stations. increase

In addition, the structure of the dedicated DDC chip is fixed, and the bandwidth cannot meet the demodulation requirements of high-speed data (such as greater than 400Mbps)

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