High-speed vehicle detection equipment and range walk correction method

Abstract

The invention relates to a high-speed vehicle detection device and a range walk correction method. The detection device comprises a linear frequency modulation millimeter wave radar detector and a display control device. The linear frequency modulation millimeter wave radar detector comprises an antenna radio frequency unit, a frequency modulation transmit-receive device, an intermediate frequency signal processing module and an information processing module. The information processing module comprises an AD converter, a DSP and an FPGA. The method comprises the following steps: performing pulse compression on an echo baseband signal by adopting a matched filtering method; and carrying out envelope compensation alignment on the signal subjected to pulse compression by adopting a keystone method. The specific implementation method of the keystone is an improved Chirp-Z algorithm, the algorithm changes IFFT operation in a slow time domain to be carried out in a fast time domain, Chirp-Z transformation carried out in the slow time domain is combined, the original two-step operation is combined into one step, and the operation amount is reduced. According to the method, the problem of range walk in the accumulation process is effectively corrected, so that noise suppression of echo signals is realized, the coherent accumulation gain is greatly improved, and the rapid detection capability of the millimeter wave radar is improved.

Description

technical field [0001] The invention relates to the field of radar radio frequency and signal processing, and more specifically relates to a high-speed vehicle detection device and a distance walking correction method, which can be applied to the driving detection of expressway target vehicles. Background technique [0002] In recent years, with the rapid development of intelligent expressway traffic management, the information collection technology of traffic roads is particularly important, and the millimeter wave radar detection system is more widely used in expressway vehicle detection. With the development of VLSI (Very Large Scale Integration) manufacturing process, the cost and volume reduction of microwave and millimeter-wave radar components provides more room for development of millimeter-wave radar detection systems. Linear frequency modulation continuous wave LFMCW (Linear Frequency Modulation Continuous Wave) radar provides an idea for expressway vehicle target ...

AI Technical Summary

Problems solved by technology

When the number of accumulated pulses is large, the calculation amount of Chirp-Z transformation is better than the first two, but generally speaking, the steps are still relatively cumbersome and the calculation amount is relatively large.

[0005] In order to solve the problem of high-speed vehicle detection distance walking, the publication number is CN106405556A, the publication date is 2016-11-02, and the title of the invention is "vehicle target information detection and recognition system and its signal processing method". Vehicle information, a detection method for energy accumulation using a non-coherent accumulation method. This accumulation method has low echo energy accumulation efficiency and poor signal-to-noise ratio; the publication number is CN112924971A, the publication date is 2021-06-08, and the invention name is "One An FPGA-based vehicle detection radar signal processor" uses the CZT method to realize the Keystone transformation, which has a large amount of calculation and is relatively complicated

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