Anti-interference DS-GMSK receiving method and device suitable for satellite communication

Abstract

The invention discloses an anti-interference DS-GMSK receiving method and an anti-interference DS-GMSK receiving device suitable for satellite communication, and belongs to the technical field of satellite communication. The DS-GMSK has the advantages of a direct sequence spread spectrum system, works in a low signal-to-noise ratio environment, and is high in anti-interference capability; and meanwhile, the characteristics of high GMSK modulation spectrum utilization rate and low out-of-band radiation power are combined, so that the spectrum utilization rate is improved and the out-of-band radiation is reduced while the anti-noise and anti-interference capabilities are enhanced. By using FFT and IFFT operations, the operation efficiency of a capture and demodulation algorithm is significantly improved, and the anti-interference DS-GMSK receiving method suitable for satellite communication is more applicable to implementation of an FPGA platform. The anti-interference DS-GMSK receivingdevice comprises a down-conversion module, a frequency offset compensation module, a code phase tracking adjustment module, a capture module and a dispreading demodulation module. According to the anti-interference DS-GMSK receiving method and the anti-interference DS-GMSK receiving device, the DSSS and the GMSK are combined, the anti-noise and anti-interference capabilities are enhanced, the spectrum utilization rate is improved, the out-of-band radiation is reduced, and the method and the device have a wide application prospect in the field of satellite communication.

Description

Technical field [0001] The invention relates to an anti-interference DS-GMSK (Direct Sequence Spread Spectrum Gaussian Minimum Frequency Shift Keying) receiving method and device suitable for satellite communication, and belongs to the technical field of satellite communication. Background technique [0002] In this era of informationization and globalization, satellite communication is an important and indispensable means of communication. Compared with general civilian communication methods, satellite communication often needs to work in a communication environment with low signal-to-noise ratio and strong interference, and it also has high requirements for confidentiality and anti-interception. [0003] In satellite communications, modulation methods such as BPSK are often used. However, due to the sudden change of carrier phase between symbols in BPSK, the frequency spectrum is broadened, and the power spectrum will produce strong sidelobe components, and the spectrum utilizati...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the anti-jamming DS-GMSK receiving method and device suitable for satellite communication disclosed by the present invention is: combining DSSS and GMSK can enhance the anti-noise and anti-jamming capabilities while improving spectrum utilization, Reducing out-of-band radiation has broad application prospects in the field of satellite communications

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