Velocity ambiguity resolution angle measurement method for vehicle-mounted LFMCW radar

Abstract

The invention discloses a velocity ambiguity resolution angle measurement method for vehicle-mounted LFMCW radar, belongs to the signal processing technology, and particularly relates to the velocityambiguity resolution and radar virtual aperture direction of arrival measurement technology. According to the invention, velocity ambiguity resolution and MIMO radar virtual aperture angle measurementprocessing are carried out in one frame of signal, a two-transmitting four-receiving radar system is taken as an example, a radar transmitting end transmits linear frequency modulation continuous wave signals with different slope durations and the same bandwidth by using a time division multiplexing technology, and a radar receiving end simultaneously receives signals reflected by two transmitting antennas through an object by using four receiving antennas. Echo signals are subjected to frequency mixing, low-pass filtering and analog-to-digital conversion and finally enter a digital signal processor DSP. 2D-FFT and two-dimensional constant false alarm detection are performed in the DSP, then resolution of velocity ambiguity and phase compensation are conducted, and finally MIMO radar virtual aperture angle measurement processing is carried out, thus realizing the purpose of the invention. The method has the effects of reducing the signal processing time and improving the radar data rate.

Description

technical field

[0001] The invention belongs to the signal processing technology, and in particular relates to the speed fuzzy resolution technology and the MIMO radar virtual aperture measurement wave direction of arrival technology. Background technique

[0002] 77G vehicle-mounted millimeter-wave radar is more and more applied to automotive driving assistance systems due to its advantages such as large bandwidth, short wavelength, high detection accuracy, and small size. The basic working process of the system radar is that the transmitter generates a fast ramp mode LFMCW waveform, that is, a high-frequency constant-amplitude continuous wave whose transmission frequency changes linearly with time, also known as a sawtooth wave. The target echo signal is mixed with the transmitted local oscillator signal, and then filtered, and the obtained beat baseband signal contains the distance, speed and angle information of the target, and the target can be measured by the beat base...

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