Satellite communication gateway station signal demodulation processing board

Abstract

The invention discloses a satellite communication gateway station signal demodulation processing board comprising an intermediate-frequency signal receiver. The intermediate-frequency signal receiver is connected with at least two A / D converters, wherein one A / D converter is directly connected with an FPGA unit, and the rest A / D converters are connected with a DDC (digital down converter). The DDC is connected with the FPGA unit, and the FPGA unit is connected with a DSP unit and a communication interface. The FPGA unit includes a numerically controlled oscillation module, the numerically controlled oscillation module is connected with a cascaded integrator comb filter module, the cascaded integrator comb filter module is connected with a half-band filter module, and the half-band filter module is connected with a channelized poly-phase filter bank module. According to the satellite communication gateway station signal demodulation processing board of the invention, the function of the DDC (digital down converter) is realized by the use of the FPGA, and simultaneous multi-channel signal processing is realized without improving the structure of the processing board as the channelized poly-phase filter bank is arranged in the FPGA unit.

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)

Images