Maneuvering Target Detection Method Based on Time-Frequency Analysis

Abstract

The present invention provides a maneuvering target detection method based on time-frequency analysis, comprising the following steps: acquiring a radar echo signal of a sky-wave radar within a first position range as a first radar echo signal, wherein the radar echo signal contains a maneuvering target Echo: Phase transformation is carried out to the first radar echo signal to obtain the second radar echo signal; by performing matching Fourier transform on the instantaneous frequency change rate of the maneuvering target to the second radar echo signal at different times respectively, Obtain a joint domain based on time and instantaneous frequency rate of change; in the established coordinate system with time and instantaneous frequency rate of change coordinate axes, along the straight line parallel to the time coordinate axis corresponding to different instantaneous frequency rate of change, the Integrating the joint domain to obtain the accumulated energy function of the maneuvering target; judging whether the energy function is less than a preset energy threshold; when the energy function is greater than or equal to the energy threshold, determining that the maneuvering target is within the first position range.

Description

technical field [0001] The invention relates to a sky wave radar maneuvering target detection technology, in particular to a maneuvering target detection method based on time-frequency analysis. Background technique [0002] In the sky-wave over-the-horizon radar, the change of the radial velocity of the maneuvering target will broaden the Doppler spectrum of the target, which makes the detection of the maneuvering target very difficult. For weak and small targets and target detection under short-term coherent accumulation, the target signal-to-noise ratio in the echo is usually very low, so the difficulty of maneuvering target detection is further increased. [0003] At present, sky wave radar maneuvering target detection technology is mainly divided into two categories: [0004] 1. Parameter estimation and phase compensation technology based on polynomial phase model [0005] This technology is to model the target echo as a polynomial phase signal (Polynomial Phase Signa...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the existing maneuvering target detection technology based on time-frequency analysis has a large amount of computation and is easily affected by transient interference.

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