Method for reducing interference of ground and isolation belt on automobile millimeter wave radar

Abstract

The invention relates to a method for reducing the interference of the ground and an isolation belt on an automobile millimeter wave radar. The method includes the following steps that: step 1, transmission signals are emitted, and return signals are generated when the transmission signals meet an object; step 2, the return signals are received; step 3, frequency mixing is performed on the returnsignals and local oscillation signals, so that intermediate-frequency signals can be outputted; step 4, distance fast Fourier transformation and Doppler fast Fourier transformation are separately performed on the intermediate-frequency signals; step 5, the distance-Doppler two-dimensional spectrum of the intermediate-frequency signals is obtained; step 6, distance dimension information and speed dimension information at a target position are extracted from the distance-Doppler two-dimensional spectrum, and the distance dimension information is subjected to constant false alarm processing by using a sorting method; step 7, a unit average method is adopted to perform constant false alarm processing on the speed dimension information which has been subjected to sorting method-based constant false alarm processing, so that the detection threshold value of the target position can be obtained; step 8, a final detection threshold value is obtained according to a set false alarm probability; step 9, the peak values of the target position are compared with the final detection threshold value; and step 10, whether a target object exists in the target position is judged.

Description

technical field [0001] The invention relates to a method for reducing radar interference, in particular to a method for reducing interference to millimeter-wave radar by ground and isolation zones during vehicle operation. Background technique [0002] In the traditional radar signal detection, the detection is always carried out in the presence of interference. When the echoes of these interference objects and the target object are mixed together, it will make the judgment of the target object very difficult. Conventional radar systems usually use constant false alarm (CFAR) processing to solve this problem, that is, to filter interference echoes while maintaining a constant constant false alarm probability. However, since the echo of the target is mixed in the clutter environment, if the threshold is set too high, the target will be buried in the strong clutter, causing false alarms, and if the threshold is set too low, it will cause strong clutter It is falsely reported ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the return signal from the ground and the isolation zone interferes with the traditional automotive radar, resulting in missing or false alarms of the return signal of the target object. Methods

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