Non-cooperative frequency hopping signal deciphering method

Abstract

The invention provides a non-cooperative frequency hopping signal deciphering method. The non-cooperative frequency hopping signal deciphering efficiency can be obviously improved by using the methodprovided by the invention. The method is realized through the following technical schemes: firstly sampling the frequency band located by a frequency hopping signal through a frequency hopping signaldeciphering circuit, obtaining the spectrum through a FFT fast algorithm, and performing incoherent accumulation on N FFT results; estimating a core parameter of the frequency hopping signal by adopting a frequency hopping point estimation circuit, a hopping speed estimation circuit and a frequency hopping pattern estimation circuit, wherein the frequency hopping point estimation circuit initiallyestimates the signal bandwidth on each frequency hopping point to obtain the hopping speed of the frequency hopping signal, and estimates the frequency point switching moment of the frequency hoppingsignal; recording the frequency hopping points of the signal crossing more than two complete frequency hopping periods according to the time order, and determining the frequency hopping period; performing the de-hopping of the frequency hopping signal by the frequency hopping pattern estimation circuit according to the estimated frequency hopping point, the frequency hopping pattern and the hopping speed, and demodulating the frequency hopping signal according to the estimated parameter, and outputting a demodulation signal.

Description

technical field [0001] The invention relates to a frequency hopping signal deciphering method for quickly deciphering parameters such as frequency hopping signal hopping speed and frequency hopping pattern in a non-cooperative frequency hopping communication system. Background technique [0002] Frequency hopping technology is one of the most effective anti-jamming methods in communication anti-jamming technology. The transmission frequency of the frequency hopping signal using frequency hopping technology changes with time, which is a typical non-stationary signal, and it is difficult to analyze it accurately by pure time domain or frequency domain analysis methods. With the development of modern electronic technology and circuits, frequency hopping communication systems are developing in the direction of broadband frequency hopping, high-speed frequency hopping, and ultra-high-speed frequency hopping, and the frequency hopping patterns are becoming more and more complex. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a frequency hopping signal cracking method that can significantly improve the cracking efficiency and cracking success rate of non-cooperative frequency hopping signals in view of the problems of slow cracking speed and low cracking success rate in the cracking of frequency hopping signals in the prior art method

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