Dimensionality reduction subspace angle measuring method suitable for millimeter wave vehicle-mounted radar

Abstract

The invention discloses a dimensionality reduction subspace angle measuring method suitable for a millimeter wave vehicle-mounted radar. The dimensionality reduction subspace angle measuring method comprises the steps of: firstly, proposing the adoption of a beam domain MUSIC algorithm to reduce computational complexity and memory occupation, and utilizing prior information to optimize a beamforming matrix design; secondly, proposing a new MUSIC estimator, which reflects finer scale information about a signal subspace; in addition, modifying a mathematical expression of a received signal estimation sample covariance matrix for the coherent situation of two adjacent signals under single snapshot, so as to enhance the orthogonality of a noise subspace and the signal subspace and maintain Toeplitz structure. The dimensionality reduction subspace angle measuring method adopts a sub-beam space averaging method, and improves the estimation precision of the sample covariance matrix under thecondition that each sub-beam space is full rank.

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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