Radar detection method and device based on linear frequency modulation continuous waves, radar device and motor vehicle

Abstract

The embodiment of the invention discloses a radar detection method and device based on linear frequency modulation continuous waves, a radar device and a motor vehicle. The radar detection method comprises the steps of acquiring echo signals based on linear frequency modulation continuous waves of a detected target to be detected; according to the echo signal and an emission wave signal generatingthe echo signal, calculating to obtain distance information with the to-be-measured target; calculating azimuth angle information of the to-be-measured target; and obtaining the position informationof the to-be-measured target according to the distance information and the azimuth angle information. The problem of long detection time of speed measurement and distance measurement of a millimeter-wave radar can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of radar detection, in particular to a radar detection method based on chirp continuous wave, a radar detection device based on chirp continuous wave, a radar device and a motor vehicle. Background technique [0002] As of June 2019, the number of motor vehicles in the country has reached 340 million, and it has grown rapidly with the rapid growth of the national economy. Moreover, the number of cars in developed coastal areas is particularly dense. Therefore, it has brought great challenges to road traffic safety management. huge challenge. At present, it is an important means in the field of automobile collision avoidance to rely on electronic sensing equipment to strengthen the active safety warning of automobiles and help drivers avoid possible traffic accidents. [0003] At present, various technologies such as image sensors, ultrasonic radars, lidars, millimeter-wave radars, and infrared sensors can s...

AI Technical Summary

Problems solved by technology

[0006] At present, automotive millimeter-wave radar is mainly based on LFMCW (Linear Frequency Modulated Continuous Wave) waveform, which has excellent performance in single target detection, but has defects such as high false alarms and complex algorithms in multi-target detection.

At the same time, because the calculation method of the beat frequency usually uses the calculation process of FFT (Fast Fourier Transform), however, due to the fence effect, its inherent resolution cannot be improved, which limits the detection accuracy

[0007] In view of the above problems, the existing millimeter-wave radar ranging speed measurement algorithm only needs a complete triangle wave to complete the speed measurement and distance measurement; however, the algorithm has the problem of speed-distance coupling, and the false target is several times the real target.

Considering the hardware limitation of the sampling frequency of the system, a single triangular wave cycle is close to the limit when it takes about 10ms, and the speed distance matching needs about 5 cycles, that is, about 50ms, and the matching in multiple cycles also requires a lot of calculations, resulting in the overall The detection cycle becomes longer

To sum up, millimeter-wave radar has the problem of long detection time for speed measurement and ranging, which is very incomplete for high-speed cars.

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