Strong interference suppression method and system for automotive FM continuous wave radar

Abstract

The invention discloses a strong interference suppression method and system for an automobile frequency modulated continuous wave radar. The method comprises the following steps: determining a bandwidth and a total number of subbands of a radar transmitted signal, controlling the central frequency of a unit generated random subband frequency spectrum according to the radar signal, and determining a time-frequency relation of the random subband frequency spectrum; generating control voltage of a voltage-controlled oscillator according to the time-frequency relation of the random subband frequency spectrum, so as to control the voltage-controlled oscillator to emit a random subband signal; and performing frequency mixing de-sloping treatment on a strong interference signal in a receiving channel according to the random subband signal to enable a strong interference baseband signal to fall into stop band of a low pass filter. The invention further discloses a strong interference suppression system for implementing the method. By the use of the strong interference suppression method and the strong interference suppression system for strong interference suppression for the automobile frequency modulated continuous wave radar, the strong interference signal of the radar can be accurately, stably and effectively suppressed, and the target distance measurement and speed measurement reliability of the automobile frequency modulated continuous wave radar is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile frequency modulation continuous wave radar, in particular to a method and system for suppressing strong interference of automobile frequency modulation continuous wave radar. Background technique [0002] Automotive frequency modulation continuous wave radar has important applications in driver-assisted driving, intelligent vehicle environment perception, driverless driving and other technologies. With the further widespread application of this type of radar in assisting the safe driving of cars, the number of radars increases, and cars equipped with the same radar generate strong interference signals to surrounding radars, resulting in a decrease in the performance of the radar and false targets, and even misjudgment by the car . Therefore, the strong interference suppression of automotive radar is of great significance. [0003] At present, there are mainly antenna beam control methods, mod...

AI Technical Summary

Problems solved by technology

The antenna beam steering method uses the method of digital beam forming to flexibly control the antenna beam pointing to avoid the probability of strong interference; generally speaking, the antenna beam steering method can suppress strong interference to a certain extent, but the hardware cost is large

The method based on transposition frequency does not need to increase the amount of equipment, but the current existing algorithm is not stable

The post-echo processing method needs to know the frequency of the strong interference signal in advance, and use the time-domain notch filter to filter out the strong interference signal, resulting in a significant decrease in the signal-to-noise ratio of the system

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