Transmitted waveform design method suitable for automotive anti-collision radar, and target detection algorithm

Abstract

The invention discloses a transmitted waveform design method suitable for an automotive anti-collision radar, and a target detection algorithm. The method comprises the following steps: determining asystem of a radar transmitted signal as a multi-order linear frequency keying system; determining parameters of transmitted waveform according to given indicators, wherein the given indicators comprises radar transmitting frequency band, maximum detection distance, maximum detection speed, distance resolution, ranging accuracy, rate accuracy and frequency domain minimum detectable signal-to-noiseratio, and the parameters required for determining one waveform comprise frequency-modulation bandwidth, coherent processing interval, the amount of the LFSK signal, stepping number of each LFSK signal, and initial frequency difference between the LFSK signals; processing the echo data of the transmitted signal, and solving the target distance and speed. The design method disclosed by the invention is moderate in calculated quantity, the detection precision is improved on the basis that the ranging is unambiguous, and the detection dead zone caused by transmitting-receiving leakage is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of radar information, in particular to a transmission waveform design method and a target detection algorithm suitable for automobile anti-collision radars. Background technique [0002] In order to improve the safety performance of automobile driving and reduce the occurrence of traffic accidents, Advanced Driver Assistance System (ADAS) has become a research hotspot. The corresponding braking signal is given to the car, so that the car has the ability of collision warning or autonomous collision avoidance. [0003] Millimeter wave radar has a long detection range and high accuracy, making it a reliable choice for ADAS sensors. The current vehicle-mounted millimeter-wave radars are mainly 24GHz and 77GHz, which are used for rearward assistance and forward detection of vehicles respectively. In terms of waveform selection, existing anti-collision radars generally use Linear Frequency Modulated Continuous W...

AI Technical Summary

Problems solved by technology

However, the result of the detection largely depends on the estimation of the phase difference. Since the value range of the phase difference itself is small, the small error of the phase difference estimation is small when the SNR is not high or the coherent accumulation time is short It will also bring about a more obvious decline in the accuracy of distance and speed measurement.

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