Method for measuring target azimuth angle by using vehicle-mounted radar and vehicle-mounted radar

Abstract

The invention discloses a method for measuring a target azimuth angle by using a vehicle-mounted radar and a vehicle-mounted radar. According to the method and the vehicle-mounted radar, spatial domain echo signals are obtained according to the received echo signals of a target; an original spectral peak position corresponding to the peak value of an original spatial spectrum obtained according tothe spatial domain echo signals is determined; a to-be-estimated spatial spectrum angle range interval is determined based on the original spectral peak position; a to-be-estimated spatial spectrum angle is set; a preset APES algorithm is adopted for the angle so as to obtain the estimation result of a target spatial spectrum; and the target azimuth angle of the target is estimated based on the estimated spectral peak position of the target spatial spectrum. According to the method, the to-be-estimated spatial spectrum angle range interval is obtained through fast Fourier transform, so that the value range of the original to-be-estimated spatial spectrum angle can be narrowed; a Q matrix in the preset APES algorithm is obtained only according to a sample correlation matrix, so that the Qmatrix does not transform along with the to-be-estimated spatial spectrum angle; and inversion operation needs to be performed on the Q matrix once, and therefore, the calculation of super-resolutionangle measurement can be realized in a short time.

Description

technical field [0001] The invention relates to the technical field of vehicle radar, and more specifically, relates to a method for measuring the azimuth angle of a target by vehicle radar and the vehicle radar. Background technique [0002] Vehicle radar has become an irreplaceable sensor choice in intelligent driving solutions because of its good speed measurement ability for targets and good penetration ability for rain and fog. In order to achieve accurate two-dimensional positioning of the target, the vehicle-mounted radar needs to measure at least the distance between the target and the radar (that is, the slant distance) and the angle between the line between the target and the center of the radar relative to the direction of the center of the radar beam (that is, the azimuth of the target). [0003] At present, the commonly used target azimuth measurement scheme is: the vehicle radar uses N (N>1) antennas to receive the echo signals of the target; the echo signal...

AI Technical Summary

Problems solved by technology

Traditional super-resolution algorithms such as MUSIC, CAPON, and ESPRIT usually require multiple snapshots of radar data to perform angle measurement calculations, while vehicle-mounted radars have high data rate requirements and require the use of single snapshot data to complete angle measurement calculations. Not applicable

Although single-shot super-resolution algorithms such as the APES algorithm can use a single snapshot of the radar data to estimate the spatial spectrum, due to the large amount of calculation, it usually exceeds the computing power of the radar chip and cannot meet the real-time requirements of the vehicle radar.

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