Frequency modulation continuous wave anti-collision radar target detection method under strong interference condition

Abstract

The invention provides a frequency modulation continuous wave anti-collision radar target detection method under the strong interference condition. The advantages of single-passage target receiving, angle measurement and anti-collision radar miniaturization of a time division multiplexing receiving passage, and the advantage of greater zero depth inhibition strong interference formed by the self adaptive wave beams in the interference direction under the interference existence condition without influence on target detection at the same time are sufficiently merged, and the goal of miniaturized anti-collision radar target detection under the interference existence condition is realized. Compared with the prior art, the method provided by the invention has the advantages that the time division multiplexing receiving passage technology is adopted, the calibration problem of magnitude-phase inconformity between multiple passages and a frequency generating module of the multiple passages can be reduced, and the miniaturization and the practical use of the anti-collision radar can be realized. The self adaptive wave beam forming technology is adopted, when the electromagnetic work environment of the anti-collision radar is clear, the target detection can be fast realized, the signal interference noise ratio of useful signals is realized, and the target detecting capability of the useful signals is realized.

Description

technical field [0001] The present invention relates to a frequency modulation continuous wave (FMCW) anti-collision radar target detection method under strong interference conditions, in particular to a miniaturized frequency modulation continuous wave (FMCW) anti-collision radar using time division multiplexing array signal processing and adaptive beamforming algorithm under radio frequency interference conditions Search for targets, suppress and suppress interference and directional interference, enhance target signal-to-interference-noise ratio (SINR), and improve target detection probability. Background technique [0002] With the number of automobiles increasing year by year in our country and the road traffic safety problem becoming more and more prominent, it is urgent to find a suitable active anti-collision device for automobiles to ensure driving safety. Research on the millimeter wave radar collision avoidance system has begun at home and abroad. This is because ...

AI Technical Summary

Problems solved by technology

When many vehicles are equipped with frequency modulation continuous wave anti-collision radar in the same frequency band or when the electromagnetic environment is relatively complex, there will be a large amount of radio frequency interference, which will cause serious electromagnetic wave cross-interference of the anti-collision radar, so that under the condition of extremely low signal-to-interference-noise ratio (SINR) Useful target detection and information extraction become difficult

[0004] At present, in order to effectively detect targets under the condition of electromagnetic wave cross-interference, Li Jun proposed to use adaptive digital beamforming technology to suppress the influence of strong interference and radio frequency interference on useful signals, but for automotive anti-collision radar, the cost is its One of the determinants of commercialization, multiple arrays means a rapid increase in costs

Xie Sudao proposed to introduce the Costas code into the transmit signal design. This method starts from the perspective of transmit waveform design; An Hongliang proposed to use the triangular wave LFMCW with random slope as the transmit waveform of the radar, but the above two methods will cause the complexity of the frequency module. It also means that the cost rises and the volume weight increases

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