Time Domain Detection and Splicing Method of Non-Uniform Frequency Hopping Signals

Abstract

The time domain detection and splicing method for non-uniform frequency hopping signals disclosed by the invention can effectively suppress fixed frequency interference and improve the detection probability of frequency hopping signals. The present invention is realized by the following technical solutions: down-converting the signal by using the determined carrier frequency, filtering and preprocessing, smoothing the preprocessed signal data, detecting the frequency hopping signal by using a preset threshold, and detecting the start time of the frequency hopping signal according to the Calculate the frequency hopping gap between adjacent two signals before and after the end time, and estimate the frequency hopping gap adaptively; count all the frequency hopping gaps of the frequency hopping signal; in the estimated frequency hopping gap, take the median of the counted frequency hopping gaps , calculate the absolute value of the difference between all frequency hopping gaps and the median value; screen the statistical frequency hopping gaps according to the precisely estimated frequency hopping gaps, detect the continuity of the frequency hopping signals in turn, and use the non-uniform frequency hopping signal for each frequency hopping The gap time is relatively fixed to splicing non-uniform frequency hopping signals, and the strategy of frequency hopping gap continuity is used for splicing.

Description

technical field [0001] The invention relates to the field of frequency hopping communication signal processing, in particular to a frequency hopping signal detection and splicing method in a complex electromagnetic environment, especially a time domain detection and splicing method for non-uniform frequency hopping signals. Background technique [0002] With the continuous progress and development of technology in the field of communication, people's requirements for modern communication are getting higher and higher. Frequency hopping technology has become a leading technology in the field of communication anti-jamming due to its low interception and high anti-jamming capability, and has been used in all walks of life. Frequency hopping is a commonly used spread spectrum method in wireless communication. If frequency hopping is not used, and the mobile station always works on a fixed frequency, each burst of the entire call may be subject to constant strong interference. ....

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of difficult signal splicing caused by the different duration of each hop of the non-uniform frequency hopping signal in order to solve the problem of difficult signal splicing caused by the difference of the time-frequency diagram of the frequency hopping signal over time in the case of fixed frequency interference. A splicing method for time-domain detection of non-uniform frequency-hopping signals is proposed with high efficiency, high stability, and high real-time performance, which can effectively suppress fixed-frequency interference and improve the detection probability of frequency-hopping signals.

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