Hybrid network station frequency hopping parameter blind estimation method based on STFT-SPWVD

Abstract

The invention discloses a hybrid network station frequency hopping parameter blind estimation method based on short-time Fourier transform (STFT) and smooth pseudo Wigner distribution (SPWVD), which is used for solving the problems of low frequency hopping parameter estimation precision and high complexity under the condition of low signal-to-noise ratio in the prior art. According to the implementation scheme, the method comprises the following steps of firstly, transforming an antenna receiving signal into a time-frequency domain by using the short-time Fourier transform, and carrying out the adaptive noise reduction processing on the time-frequency signal so as to improve the anti-noise performance of a system; secondly, carrying out fine estimation on the frequency through a K-means mean value clustering algorithm; then extracting the time-frequency information according to the finely estimated frequency to obtain the time-hopping coarse estimation; and finally, carrying out fine estimation on a hopping moment by adopting the smooth pseudo Wigner transformation and a corrected truncation threshold. According to the method, the complexity is reduced, the frequency resolution isincreased, the estimation precision of the frequency hopping moment is improved, and the method can be used for the parameter estimation of the frequency hopping signal in a complex electromagnetic environment.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a method for estimating parameters of frequency hopping signals, which can be used for parameter estimation of frequency hopping signals in complex electromagnetic environments. Background technique [0002] Because the frequency hopping signal has the characteristics of strong anti-interference and anti-fading ability, low interception rate and easy realization of multiple access networking, it is widely used in the field of wireless communication, and it also poses a severe challenge to communication countermeasures and investigations. The parameter estimation is A key step in the detection of frequency hopping signals. [0003] The carrier frequency hopping technology of frequency hopping signals has been more and more applied in the field of frequency hopping communication and reconnaissance. Due to the strong anti-jamming ability of frequency hopping ra...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a STFT-SPWVD-based blind estimation method for frequency hopping parameters of hybrid network stations, to solve the problem that the above-mentioned prior art does not consider the frequency conversion time of the actual communication system and the hybrid networking mode, which is not easy for engineering implementation, and The estimation accuracy of frequency hopping signal parameters is low, and the estimation complexity is high.

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