Target detection method of auxiliary vehicle driving radar

Abstract

The invention discloses a target detection method of an auxiliary vehicle driving radar. The method comprises steps that an emission waveform mode of the radar is determined to be a multi-order frequency stepping continuous wave MS-FSCW, one integral MS-FSCW waveform comprises two parts of an upper frequency sweeping segment and a lower frequency sweeping segment, and signals of each frequency sweeping segment are composed of multiple frequency stepping dot frequency continuous wave signals arranged in an alternative mode; MS-FSCW emission waveform parameters of the radar are determined, waveform parameters are determined according to a largest distance measurement scope, a largest speed measurement scope, distance measurement precision and a system detectable smallest signal to noise ratio, and the waveform parameters comprises frequency sweeping band width, a frequency sweeping period, a sampling rate, the quantity of frequency stepping continuous wave signals and initial frequency difference among the frequency stepping continuous wave signals; an MS-FSCW emission signal echo of the radar is processed to acquire a target distance and the speed information. Through the method, distance and speed detection blind zones caused by transceiving leakage can be reduced, and target distance measurement and speed measurement precision is improved.

Description

technical field [0001] The invention belongs to the technical field of radar information, in particular to a target detection method of a vehicle-mounted auxiliary driving radar. Background technique [0002] In recent years, the automobile industry has been highly developed, and the frequency of traffic accidents brought about by it is also increasing year by year. Therefore, traffic safety issues have attracted our enough attention. The vehicle-assisted driving radar can effectively monitor the surrounding environment of the vehicle in real time and give timely warning of potential dangers, thereby reducing the probability of traffic accidents at the source and providing a guarantee for driving safety. [0003] In the design of vehicle-mounted assisted driving radar, the design of transmission waveform is particularly critical. It will not only affect the detection performance of the radar, but also affect the complexity of signal processing in a multi-target working envi...

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Problems solved by technology

In addition to the above-mentioned advantages, this waveform has two problems: First, compared with the LFMCW waveform, under the same SNR condition, the ranging and speed measuring accuracy of the MFSK waveform is poor, mainly because the noise affects the target spectrum. The phase estimation of the line has a great influence, and when the signal-to-noise ratio of the target echo is low, the measurement accuracy of the MFSK waveform is low; Spectrum line, when the target echo spectrum subject to distance-velocity coupling is located near zero frequency, it is difficult to be detected, which makes the MFSK waveform have a detection blind zone subject to distance-velocity coupling

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