Parameter estimation method for frequency hopping signals in frequency hopping non-cooperative communications

A technology of frequency hopping signal and parameter estimation, applied in digital transmission systems, electrical components, modulated carrier systems, etc., can solve the problem of Kay method estimation performance degradation, and achieve good performance and estimation performance improvement.

Inactive Publication Date: 2018-01-19
XIDIAN UNIV
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Problems solved by technology

[0003] To sum up, the problem existing in the prior art is that the estimation performance of the Kay method decreases significantly with the decrease of the signal-to-noise ratio in single-frequency estimation

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  • Parameter estimation method for frequency hopping signals in frequency hopping non-cooperative communications
  • Parameter estimation method for frequency hopping signals in frequency hopping non-cooperative communications
  • Parameter estimation method for frequency hopping signals in frequency hopping non-cooperative communications

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[0044] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0045] Starting from the basic theory of time-frequency analysis, the present invention combines the short-time Fourier transform spectrogram method with the least squares and Zoom-FFT algorithms to estimate the parameters of the frequency-hopping signal. It has good performance in the estimation of , and the estimation performance of hopping frequency is better than Kay method at low signal-to-noise ratio.

[0046] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] like figure 1 As shown, the method for estimating the parameters of...

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Abstract

The invention belongs to the field of electronic countermeasure and communication technologies and discloses a parameter estimation method for frequency hopping signals in frequency hopping non-cooperative communications. The method comprises the steps of performing time-frequency analysis on a received signal to obtain a time-frequency diagram thereof, and taking the maximum frequency value in the time domain from the time-frequency diagram to obtain a time-frequency ridge line; performing first-order difference processing on the time-frequency ridge line to obtain a frequency hopping momentdiagram; selecting a plurality of peak points in the first-order differential frequency hopping moment diagram to fit a straight line, and estimating the hopping speed and hopping time by using a formula according to the straight slope; decomposing the frequency hopping signal into a number of single-frequency signals according to the estimated hop speed and hop time, performing FFT preprocessing,and estimate the frequency of the single-frequency signals in each time slot using Zoom-FFT, and obtaining a frequency hopping pattern after all the frequencies in the hopping period are estimated. The parameter estimation method in the invention has good performance in the estimation of hopping speed and hopping time, and obviously improves the estimation performance of the frequency hopping pattern at a low signal-to-noise ratio as compared with the LS-Kay method.

Description

technical field [0001] The invention belongs to the technical field of electronic countermeasures and communication, and in particular relates to a method for estimating parameters of frequency hopping signals in frequency hopping non-cooperative communication. Background technique [0002] With the rapid development of communication technology, electronic countermeasures have become an important means of combat in modern communications. Communication countermeasures are an important part of electronic countermeasures. Reconnaissance and anti-reconnaissance, interference and anti-interference are constantly being staged between communicating parties and non-cooperating parties. struggle. Frequency hopping communication has been widely used in military and civilian anti-jamming / secret communication fields due to its good anti-interference and anti-interception capabilities, good confidentiality performance, safety and reliability. The main task of frequency hopping non-coope...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/713H04L27/00
Inventor 石磊李小平刘彦明白博文杨敏彭晓
Owner XIDIAN UNIV
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