A Method for Estimating Angle Confidence of Vehicle Millimeter-Wave Radar

Abstract

The invention discloses a method for estimating the angle confidence of a vehicle-mounted millimeter wave radar. The radar acquisition data is subjected to two-dimensional fast Fourier transform and then normalized, and the normalized real data and steering vector are calculated by beam forming. Beam directivity, determine the angle value at which the target is located, construct the steering vector under the angle value according to the angle value and the arrangement of the radar antenna, and perform beamforming calculation on the constructed steering vector and the constructed received snapshot data to obtain For the ideal beam directivity under the angle value, the correlation coefficient is calculated according to the beam directivity obtained from the real data and the ideal beam directivity, and the noise is eliminated according to the threshold value of the correlation coefficient. The method for estimating the angle confidence of the vehicle-mounted millimeter-wave radar, by constructing an ideal signal, compares it with the real signal, and uses the entire information of the waveform to calculate the correlation coefficient, so that the accuracy of the angle confidence is higher.

Description

technical field [0001] The invention belongs to the technical field of vehicle-mounted millimeter-wave radar, and in particular relates to a method for estimating angle confidence of vehicle-mounted millimeter-wave radar. Background technique [0002] With the development of artificial intelligence, automotive electronics combined with artificial intelligence applications have gradually realized the development from L1 to L5, and millimeter-wave radar has a strong ability to penetrate fog, smoke and dust, and has all-weather (except heavy rain) all-day The characteristics of the car are an indispensable part of the direction of autonomous driving, and are widely used in automotive electronics. Millimeter-wave radar has a history of more than 20 years abroad and has entered the fifth generation of development, while domestic millimeter-wave radar was officially launched in 2016, and there is still a big gap in performance abroad. Many aspects are still in the research and ex...

AI Technical Summary

Problems solved by technology

Distance resolution, speed resolution, angle estimation, and angle resolution are important parameters of millimeter-wave radar. Among them, speed and distance are directly reflected from the results of FFT, and angle estimation is calculated by secondary estimation, which is different from the initial calculation. The correctness of the results directly affects the angle estimation, where the angle confidence is the correctness of the response angle estimation; the angle confidence is mainly to evaluate the confidence of the angle direction calculated by the beamforming, which can be calculated by the main and side lobe energy difference, The confidence of the angle is calculated by the angle difference of the main lobe and the half power point of the main lobe, etc., because the radar antenna structure may not be completely arranged in a linear and uniform array, resulting in poor versatility of this method

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