Self-adaptive waveform design method for improving millimeter wave radar detection estimation performance

Abstract

The invention discloses a self-adaptive waveform design method for improving millimeter wave radar detection estimation performance, belongs to the field of signal processing, and aims to solve the problem of relatively low millimeter wave radar target detection performance caused by limited platform space and transmitting power in automatic driving. The method comprises the following steps: firstly, based on an FMCW signal, establishing a millimeter wave phased array detection model; secondly, constructing emission waveform parameter constraints considering the distance and the speed resolution by analyzing the relationship between the distance and the speed resolution and the emission waveform parameters; then, based on a maximum output SCNR criterion, establishing a transmitting waveform parameter and receiving weight joint optimization model with distance and speed resolution constraints so as to improve millimeter wave radar target detection and distance and speed resolution performance; finally, solving, by the proposed method, the complex nonlinear optimization problem based on an alternating iteration method. By means of the invention, transmitted waveform parameters and receiving weight can be adaptively adjusted to improve target detection performance and meet distance and speed resolution requirements at the same time.

Description

technical field [0001] The invention belongs to the field of radar signal processing, and in particular relates to a joint design method of millimeter-wave radar waveform parameters and receiving rights under the constraints of distance and velocity resolution, which is used to improve the detection probability of millimeter-wave radar targets. Background technique [0002] In recent years, with the rapid iteration of the automotive industry, millimeter-wave radar has gradually become an indispensable sensor for autonomous driving due to its advantages of low cost, high precision, and good stability. Millimeter-wave radar transmits programmable signals to free space through the transmitter, and the receiver receives the echoes of targets and other objects, and then processes the obtained echoes based on relevant signal processing methods to perceive environmental information. It can be seen that the transmission signal runs through the whole process of environmental informat...

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Problems solved by technology

[0004] Aiming at the problem of low target detection performance of millimeter-wave radar caused by limited platform space and transmission power in automatic driving, the present invention proposes the following technical solution: an adaptive waveform design method for improving the detection and estimation performance of millimeter-wave radar, including the following steps: Step 1: Establish a millimeter-wave phased array detection model based on the FMCW signal; Step 2: Analyze the relationship between the distance and velocity resolution and the transmit waveform parameters, and construct the transmit waveform parameter constraints considering the distance and velocity resolution; Step 3: Based on the maximum output SCNR Criteria, establish a joint optimization model of transmitting waveform parameters and receiving weights with distance and velocity resolution constraints, and obtain complex nonlinear problems about optimization variables; Step 4: Solve the obtained complex nonlinear problems alternately and iteratively, and obtain optimal transmitting waveform parameters and receive right, and the corresponding output SCNR

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