A Dimensionality-Reduced Subspace Angle Measurement Method Applicable to Millimeter-Wave Vehicle Radar

Abstract

The invention discloses a dimensionality reduction subspace angle measurement method applicable to the field of millimeter-wave vehicle radar target detection, which includes the following steps: firstly, a beam domain MUSIC algorithm is proposed to reduce computational complexity and memory occupation, and a priori information is used To optimize the beamforming matrix design; secondly, a new MUSIC estimator is proposed to reflect the finer scale information about the signal subspace; in addition, for the case where two adjacent signals are coherent under a single snapshot, the modified The mathematical expression of the sample covariance matrix of the received signal is estimated to enhance the orthogonality of the noise subspace and the signal subspace, maintain its Toeplitz structure, and use the method of sub-beam space averaging. Under the condition that each sub-beam space is full rank, Improve the estimation accuracy of the sample covariance matrix.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a dimensionality reduction subspace angle measurement method suitable for millimeter-wave vehicle-mounted radars. Background technique [0002] In recent years, the field of automatic driving has been booming, and automatic cruise, blind spot detection, and forward collision avoidance are all typical application scenarios. The millimeter-wave radar system is an indispensable part of the field of autonomous driving technology. It has good performance in harsh weather environments such as foggy and low light conditions, which is not available in other sensors such as lidar and cameras. . Among them, frequency-modulated continuous wave (FMCW) radar is a millimeter-wave radar system that obtains distance and speed information by frequency modulation of continuous waves. For a long time in the past, the application of FMCW radar was limited to a small range. In the...

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Problems solved by technology

[0008] Purpose of the invention: In view of the above problems, the present invention proposes a dimensionality reduction subspace angle measurement method suitable for millimeter-wave vehicle radar, on the one hand, it meets the requirements of low computational complexity and memory usage, on the other hand, whether it is a single target or Superior angle measurement performance in the case of multiple targets

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