A Radar Pedestrian Detection Method Based on Time-Frequency Domain Sparse Reconstruction

A sparse reconstruction, pedestrian detection technology, applied in the field of radar signal processing and target recognition, can solve the problem of low radar detection rate, and achieve the effect of improving search accuracy, improving detection accuracy, and easy feature extraction

Active Publication Date: 2021-09-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

Realized the separation of multi-component time-frequency domain aliasing, solved the conditional constraints of time-frequency images on motion feature detection and the problem of low detection rate of radar under complex environmental noise conditions, has good generalization ability, and is convenient for engineering implementation

Method used

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Embodiment Construction

[0060] Definition of Abbreviations and Key Terms

[0061] FFT (Fast Fourier Transform, Fast Fourier Transform)

[0062] CFAR (constant false alarm rate, constant false alarm)

[0063] PRI (pulse repetition period, pulse repetition period)

[0064] OMP (Orthogonal Matching Pursuit, Orthogonal Matching Pursuit)

[0065] SVM (Support Vector Machine, support vector machine)

[0066] The invention proposes a radar pedestrian detection system based on time-frequency domain sparse reconstruction. When a person moves forward, the torso and limbs will swing regularly, that is, the micro-movement of the target presents a micro-Doppler effect in the radar signal. The pedestrian detection system of the present invention is completed by studying the Doppler shift of the radar echo and its phase change law, and combining the sparse signal processing technology.

[0067] In order to make the object, technical solution and advantages of the present invention clearer, the present inventio...

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Abstract

The invention belongs to the technical field of radar signal processing and target recognition, and provides a radar pedestrian detection method based on time-frequency domain sparse reconstruction. Its main purpose is to solve the conditional constraints of time-frequency images on motion feature detection and the low detection rate of radar under complex environmental noise conditions. The main technical solutions include: step 1, the radar is used as a data acquisition device, and the A / D sampling data can be obtained as the radar signal S(t) to be identified; step 2, the A / D sampling data is used for two-dimensional FFT to obtain the distance dimension ‑Speed ​​dimension frequency domain data S(f); step 3, CFAR detection to obtain the motion parameters of the moving target, and at the same time obtain the range gate where the moving target is located; step 4, take out the range gate data S where the moving target is located n (f), perform sparse reconstruction processing; step 5, perform feature extraction on the reconstructed moving target signal; step 6, determine the category of the target through the target decision device.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and target recognition. More specifically, the invention relates to a radar pedestrian detection system based on time-frequency domain sparse reconstruction, which can be used for radar target recognition processing in complex environments. Background technique [0002] Pedestrian detection technology has broad application prospects in automotive assisted driving, intelligent monitoring, intelligent transportation, and home service robots. At the same time, pedestrian detection does not exist in isolation, it is closely related to issues such as pedestrian tracking, behavior analysis, gesture recognition, scene segmentation, etc., and has high scientific research value and commercial value. [0003] As a non-contact life detection technology, radar is less affected by light and has high detection accuracy. It can detect and locate targets all day, all weather, and at a long distanc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
Inventor 王章静余月琴缪显涵汪呈智杨伦龙吴兆亮
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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