LFMCW signal rapid detection and estimation method

Abstract

The invention belongs to the technical field of radar signal analysis, and discloses an LFMCW signal rapid detection and estimation method. Quasi-coherent accumulation is performed on the LFM part of each period of the same modulation frequency in LFMCW signals according to PFRFT energy so that the signals are enabled to have great energy concentration characteristic in the PFRFT domain, i.e. the PFRFT of the signals has an obvious peak value in two sections. Firstly rapid period fractional order Fourier transform is performed on the linear frequency modulation continuous wave signals, the maximum modulus square of period fractional order Fourier transform act as a target function to establish an optimization model, and the optimization model is solved by using a genetic algorithm so that the optimal parameter estimation of the signals can be obtained. Four-dimensional parameter searching is performed on the PFRFT energy of the linear frequency modulation continuous wave signals by using the genetic algorithm so that detection and estimation of radar weak signals can be realized, the method is especially applied to the design of a signal analysis system of low interception probability radar and thus the theoretical and project application of the PFRFT algorithm can be realized.

Description

technical field [0001] The invention belongs to the technical field of radar signal analysis, in particular to a method for fast detection and estimation of LFMCW signals, that is, to the problem of fast detection and parameter estimation of a class of low interception probability radar signals. Background technique [0002] Weak signal detection and estimation is one of the core issues in the field of radar signal processing and radar countermeasures. Modern radars can improve the detection ability of weak targets through signal processing methods. Among them, the long-time processing method of radar signals is one of the key technologies to improve the power of radars. The essence of long-time radar signal processing is to increase the actual use of signal energy through long-term processing of radar target echo signals, thereby increasing the power of radar and extending the radar's operating distance. For electronic intelligence reconnaissance, low probability of interc...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to improve the existing radar signal detection and estimation method, and propose a fast detection and estimation method for LFMCW signals, which is a fast calculation method of periodic fractional Fourier transform and a four-dimensional parameter space for signal detection and estimation The peak search algorithm solves the difficult problem of LFMCW signal interception and feature extraction, improves the speed and accuracy of radar signal detection and estimation, and improves the ability of electronic reconnaissance to detect and estimate weak signals

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