MFSK modem based on frequency hopping

Abstract

The invention discloses a MFSK modem based on frequency hopping and relates to a technology capable of effectively increasing a system anti-interference capability in the communication field. In a frequency hopping communication system, a MFSK modulation mode is adopted; characteristics that a symbol rate is low and an anti-interference capability is high in the MFSK modulation mode are used; based on a general MFSK signal, a symbol accumulation function is increased; and through many kinds of technologies of frequency hopping capturing, synchronization maintenance, diversity reception and the like, a high anti-interference function of the communication system is realized. Retention performance and robustness of a frequency hopping system are possessed. The modem is especially suitable for increasing the anti-interference capability of a satellite communication system.

Description

technical field [0001] The invention relates to a MFSK demodulator based on frequency hopping in the wireless communication field, and is especially suitable for being used as a modem based on high-speed frequency hopping application mode in a satellite communication system. Background technique [0002] Due to the characteristics of wide coverage, long communication distance, flexible networking, and superior maneuverability, the application field of satellite communication is becoming more and more extensive. The carrier frequency of satellite communication signals is usually fixed and is vulnerable to target interference from the enemy. Frequency hopping technology has a certain inhibitory effect on target interference and can significantly improve the anti-jamming capability of satellite communication systems. This frequency-hopping time-division multiple access communication The mode puts forward higher requirements on the demodulator. [0003] The invention is mainly ...

AI Technical Summary

Problems solved by technology

[0004] The existing frequency hopping time division multiple access demodulator supports low frequency hopping rate, which can reach up to 1000 hops per second. When the hopping rate increases and the burst becomes shorter, the transmission efficiency decreases accordingly; the frequency hopping bandwidth is narrow, and the widest reach 800MHz, the spread spectrum gain is limited, which limits the anti-interference ability of the frequency hopping communication system; the number of frequency hopping frequency set frequency points is small, the frequency hopping pattern period is short, and it does not have the function of time domain scrambling / descrambling, which limits the frequency hopping communication system Anti-detection and anti-interception capabilities

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