Parameter Estimation Method of Frequency Hopping Signal Based on Time-Frequency Image Information Extraction of Signal
A time-frequency image and frequency-hopping signal technology, applied in the field of communication, can solve problems such as influence, power fluctuation, and failure
Active Publication Date: 2020-06-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, there are usually various interference signals in the frequency hopping signal received by the receiver, such as fixed frequency signal, frequency sweep signal, random burst signal, etc. When using time-frequency analysis to estimate the parameters of the frequency hopping signal, these Interference can have a large impact and even render the original method useless
Some existing literatures apply the ideas of power spectrum cancellation and mathematical morphology to the parameter estimation of frequency hopping signals, and successfully filter out the noise and interference in frequency hopping signals. However, these methods are only applicable to the frequency of interference signals There is no collision with the frequency of the frequency hopping signal and the power of the fixed frequency interference signal is relatively stable
In view of the fact that the power of the fixed-frequency interference signal fluctuates and the frequency collides with the frequency-hopping signal in the real environment, the existing methods cannot effectively realize the parameter estimation of the frequency-hopping signal
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[0058] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0059] Such as figure 1 As shown, it is a schematic flowchart of the method for estimating frequency-hopping signal parameters based on signal time-frequency image information extraction according to the present invention. A method for estimating frequency-hopping signal parameters based on signal time-frequency image information extraction, comprising the following steps:
[0060] A. Construct the receiving signal model;
[0061] B. Using a morphological method to remove frequency sweep interference, burst interference, and stray noise from the received signal in step A;
[0062] C, the center ...
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The invention discloses a frequency hopping signal parameter estimation method based on signal time-frequency image information extraction. It includes building a received signal model, using morphological methods to remove frequency sweep interference, burst interference, and stray noise from the received signal, and estimating the center of gravity of the processed gray-scale time-frequency image. The time-frequency image is removed from the fixed-frequency interference processing, the time-frequency ridge difference sequence of the processed time-frequency image is extracted and the time-frequency ridge difference sequence is optimized, and the take-off time and jumping time are estimated according to the optimized time-frequency ridge difference sequence The frequency hopping frequency completes the parameter estimation of the frequency hopping signal. The invention can effectively filter out the influence of frequency-sweeping interference signal, random burst interference signal, stray noise and fixed-frequency interference signal with power fluctuation, and realize effective estimation of hopping period, take-off time and frequency hopping frequency.
Description
technical field [0001] The invention relates to the communication field, in particular to a frequency hopping signal parameter estimation method based on signal time-frequency image information extraction. Background technique [0002] As an effective means of anti-jamming communication, frequency hopping communication has been widely used in modern military communication systems. As a third party in non-cooperative communication, frequency hopping signal parameter estimation is a key link in communication reconnaissance. Frequency hopping signal parameter estimation refers to estimating the hopping period, take-off time and frequency hopping of the frequency hopping signal without any prior knowledge. frequency. However, there are various strong interference signals in the actual electromagnetic environment, and the frequency of the interference signal usually collides with the frequency of the frequency hopping signal. In a strong interference environment, how to find a ...
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IPC IPC(8): H04B1/715H04L25/02
CPCH04B1/715H04B2001/7152H04L25/0202
Inventor 吕明李西磊路媛媛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA