A broadband radar multi-mode moving target coherent accumulation detection method and device

By using a multimodal moving target coherent accumulation detection method, the problem of low signal-to-noise ratio caused by target energy dispersion in broadband radar is solved, achieving efficient detection of moving targets with varying acceleration and improving detection capabilities.

CN117368875BActive Publication Date: 2026-07-21NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Filing Date
2023-10-10
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In broadband radar, the target energy is dispersed in different range cells, resulting in a low signal-to-noise ratio, making it difficult to detect targets with varying acceleration. Furthermore, the computational complexity of high-dimensional search is high, making it impossible to effectively detect weak targets.

Method used

A multimodal moving target coherent accumulation detection method is adopted. The radar echo is demodulated and pulse compressed, the motion parameters are estimated by short-time fractional Fourier transform, a phase compensation function is constructed to compensate for the influence of target motion, and coherent accumulation is performed to reconstruct a one-dimensional high-resolution range image.

Benefits of technology

It effectively improves the signal-to-noise ratio of the target echo, reduces computational complexity, enables effective detection of targets with variable acceleration, and improves detection capabilities.

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Abstract

A kind of broadband radar multi-modal moving target coherent accumulation detection method and device, after radar echo is demodulated and pulse compression, the two-dimensional time domain pulse compression signal of observed target is obtained;Two-dimensional time domain pulse compression signal is carried out distance symmetry transformation, and the autofocusing term of two-dimensional time domain pulse compression signal is extracted;Short time fractional order Fourier transform is used to estimate the motion parameter in autofocusing term;According to motion parameter, the instantaneous distance of multi-modal moving target in accumulation time is reconstructed, the phase compensation function is multiplied with two-dimensional time domain signal to compensate the motion influence of multi-modal moving target;After the motion influence of multi-modal moving target is compensated, two-dimensional time domain signal after the motion influence of multi-modal moving target is Fourier transformed along slow time to realize coherent accumulation, and the one-dimensional high-resolution range image of range expansion target is reconstructed.The present application can effectively improve the echo signal-to-noise ratio of broadband radar, and improve the detection ability to mobile target.
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