Maneuvering target detection method based on time-frequency analysis

Abstract

The invention provides a maneuvering target detection method based on time-frequency analysis. The maneuvering target detection method based on time-frequency analysis comprises the following steps that radar echo signals of a sky wave radar in a first position range are obtained as first radar echo signals, wherein the radar echo signals comprise maneuvering target echoes; phase transformation is carried out on the first radar echo signals, and second radar echo signals are obtained; a joint domain based on time and instant frequency change rates is obtained by carrying out matching Fourier transformation related to the instant frequency change rates of a maneuvering target on the second radar echo signals at different moments respectively; in an established coordinate system with the time and the instant frequency change rates as coordinate axes, integration is carried out on the joint domain along a straight line which is parallel to the time coordinate axis and corresponds to different instant frequency change rates, and an energy function of the accumulated maneuvering target is obtained; whether the energy function is smaller than a preset energy threshold value or not is judged; when the energy function is larger than or equal to the energy threshold value, it is determined 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-time coherent accumulation, since the target signal-to-noise ratio in the echo is usually very low, it further increases the difficulty of maneuvering target detection. [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] The technology is to model the target echo as a polynomial phase signal (PPS). Specifically, ...

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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