Multispectral line-based PSK signal two-channel phase difference acquisition method and device

Abstract

The invention relates to a multispectral line-based PSK signal two-channel phase difference acquisition method, which belongs to the technical field of digital signal processing and solves the problemof low two-channel phase difference calculation precision under a low signal-to-noise ratio condition in the prior art. The method particularly comprises steps: PSK signals in two channels are subjected to synchronous AD sampling, wherein the total sampling point number in each channel is N; any one in the two channels is selected as a reference channel, and the robust power spectral density of sampling signals in the reference channel is solved; according to the robust power spectral density of the sampling signals in the reference channel, all phase difference spectral lines within an estimated bandwidth of the sampling signals in the channel are determined; and according to the phase difference spectral lines, the PSK signal two-channel phase difference is solved. A corresponding device is obtained according to the multispectral line-based PSK signal two-channel phase difference acquisition method. The purpose of acquiring the high-precision PSK signal two-channel phase differenceunder the low signal-to-noise ratio condition can be realized. The method is also applicable to a high signal-to-noise ratio condition.

Description

technical field The invention relates to the technical field of digital signal processing, in particular to a method and device for acquiring phase difference between two channels of a PSK signal based on multispectral lines. Background technique The phase difference between the two receiving channels of the same radiation source signal has important applications in the fields of interferometer direction finding, signal synthesis, and phased array antennas. Under the condition of relatively high signal-to-noise ratio, the calculation results of the traditional two-channel signal phase difference based on the maximum spectral line method can generally meet the application requirements. However, under low SNR conditions, the performance of traditional methods drops significantly. The phase difference acquisition technology of multi-channel signals under the condition of low signal-to-noise ratio is a hot research topic at home and abroad. For low signal-to-noise ratio sign...

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Problems solved by technology

In view of the above analysis, the present invention aims to provide a method and device for obtaining phase difference of two channels of PSK signal based on multispectral lines, in order to solve the problem of low accuracy of calculation results of phase difference of two channels under the condition of low signal-to-noise ratio

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