A method and system for estimating range-velocity spectrum of millimeter-wave radar

Abstract

The present invention provides a method and system for estimating the range-velocity spectrum of a millimeter-wave radar. The method includes: acquiring an intermediate frequency signal and sampling the intermediate frequency signal; performing windowing processing and transformation on the sampled signal to construct an autocorrelation matrix; obtaining the The inverse matrix of the autocorrelation matrix is ​​described, and the range velocity frequency spectrum is solved according to the inverse matrix and the principle of minimum variance without distortion. The millimeter-wave radar range-velocity spectrum estimation method and system provided by the embodiments of the present invention utilize the principle of minimum variance without distortion, and effectively suppress the influence of noise and frequency leakage while ensuring that the estimated range-velocity frequency point signal is output without distortion. Compared with the traditional two-dimensional Fourier transform method, it can effectively improve the target signal-to-noise ratio, and the simulation shows that the signal-to-noise ratio can be increased by about 2dB, so it can effectively improve the target detection ability of the millimeter-wave radar.

Description

technical field [0001] The present invention relates to the technical field of radio wave distance measurement and speed measurement, and more specifically, to a method and system for estimating range velocity spectrum of millimeter wave radar. Background technique [0002] With the rapid development of millimeter-wave integrated circuits and the rapid growth of demand in fields such as smart cities, smart transportation, and autonomous driving, millimeter-wave radar sensors are being used more and more widely. The current millimeter-wave radar sensors are mainly divided into two types: continuous wave radar and frequency modulation continuous wave radar, and frequency modulation continuous wave radar has been widely used because of its advantages of both speed measurement and distance measurement. The radar that uses frequency-modulated continuous wave technology to measure the distance and speed of multiple targets in a specific area is the millimeter-wave radar that is wi...

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the millimeter wave radar constructs the range-velocity spectrum by performing two-dimensional Fourier transform on the collected data of multiple chirps, and then uses the peak search algorithm to detect the target. Although this method is convenient to implement, The advantage of simple calculation, but its suppression effect on noise and interference signals is poor, resulting in a low signal-to-noise ratio of the range-velocity spectrum. For targets with long distances or small distances, it is easy to cause the phenomenon of missed detection and false detection of targets, which affects The ability of millimeter-wave radar to detect long-distance or small targets

In order to solve this problem, it is necessary to increase the transmission power of the radar, but this brings disadvantages such as high power consumption and large electromagnetic wave pollution.

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