Multi-target detection and calculation method based on FMCW radar waveform and FMCW radar waveform

Abstract

The invention, which belongs to the technical field of millimeter-wave radars, particularly relates to a multi-target detection and calculation method based on an FMCW radar waveform and an FMCW radarwaveform. The designed waveform includes a frequency-modulated wave LFM portion and a constant-frequency wave CF portion. Two groups of distance and velocity information of all possible targets is obtained by echo data of an LF; velocity information of the target is obtained by a constant frequency wave and the two groups of distance and velocity information of the target is screened by using thevelocity information so as to eliminate parts of virtual targets; the two groups of distance and velocity information with virtual targets screened is matched and then the virtual targets are removed; and least squares processing is carried out on the matched target information, thereby improving the distance and velocity precision. The designed FMCW radar waveform combines the advantages of theLFM with advantages of the CF; and the hardware storage space is reduced.

Description

technical field [0001] The invention belongs to the technical field of millimeter wave radar, and in particular relates to a multi-target detection calculation method based on an FMCW radar waveform and an FMCW radar waveform. Background technique [0002] FMCW radar systems have been widely used in health monitoring, non-contact medical care, adaptive cruise. The basic idea of ​​FMCW radar is to use the difference frequency information of the transmitted signal and the received signal to obtain the speed and distance information of the target. Due to the existence of transmission delay and Doppler effect, in the multi-target environment, the traditional FMCW radar has speed-distance coupling, virtual Issues such as high alert rates. For distance-velocity coupling and false alarm rate, there are three main solutions, the scheme based on sawtooth wave modulation, the scheme based on trapezoidal wave modulation and the scheme based on triangular wave modulation. [0003] For...

AI Technical Summary

Problems solved by technology

The disadvantage of the waveform is that due to the unreasonable allocation of bandwidth, it seriously affects the detection accuracy of the system

This article Two-Step Moving Target Detection Algorithm for Automotive 77 GHz FMCW Radar,VTC 2010 Fall,2010,1-5.Design of an FMCW Radar Baseband Signal Processing System for Automotive Application,Journal of Sensors,2016,5(42):308 -312 also proposed improved waveforms, which can achieve the purpose of improving the elimination of false targets in a multi-target environment, but they have problems such as complex pairing algorithms and large amounts of calculations

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