Angle measurement method and device for radar target detection

Abstract

The invention discloses an angle measurement method and device for radar target detection, and the method comprises the steps: S1, obtaining an echo signal of a target radar, carrying out the target detection and angle measurement, and obtaining a correlation matrix of a target signal and target information comprising angle information; S2, judging whether the detection trace point is matched witha target track or not, updating a correlation matrix of a target in the track, and if the detection trace point is judged to be matched with the target track, executing the step S3; S3, performing second angle measurement on the target by using the updated correlation matrix to obtain final target angle value output. The device comprises a primary angle rough measurement module, a track matchingand updating module and a secondary angle accurate measurement module. The method can improve the target angle measurement precision in a low signal-to-noise ratio environment, is simple in implementation method, is low in cost, is high in angle measurement precision, and is high in anti-interference performance.

Description

technical field [0001] The invention relates to the technical field of radar target detection, in particular to an angle measurement method and device for radar target detection. Background technique [0002] The radar can realize the accurate measurement of the distance, speed and angle of the target, and realize the accurate positioning of the target, so as to judge the threat degree of the detected target. For example, millimeter wave radar has been widely used in vehicles and UAVs, such as common car forward collision avoidance warning radar, car direction finding and lane change auxiliary radar, UAV obstacle avoidance radar, etc., such as figure 1 Shown is the target detected by the forward collision avoidance radar of the car. In the application of the car radar, the most common one is the continuous wave pulse modulation, that is, the modulated continuous wave signal of multiple cycles is transmitted, and each cycle is T chirp , the emission sequence is as follows ...

AI Technical Summary

Problems solved by technology

[0004] The angle measurement accuracy of the target is related to the signal-to-noise ratio of the target signal and the number of array elements. The signal attenuation is large, and the target signal-to-noise ratio is usually low, which will reduce the angle measurement accuracy, and when the number of array antenna elements increases, the antenna size will increase accordingly, which will increase the cost

[0005] In the prior art, the radar usually uses a single angle measurement method to measure the target angle, that is, after obtaining the multi-element range-velocity two-dimensional FFT matrix, the MUSIC angle measurement algorithm is used to calculate the correlation matrix R=E of the target signal [X·X H ], where E[*] is the statistical average, the angle of the target can be obtained by solving the correlation matrix of the single measurement, and the premise of using the MUSIC angle measurement algorithm above must be based on an accurate estimation of the correlation matrix. In fact, the single measurement correlation The estimation of the matrix is ​​not accurate, and there may be a large error, especially in the case of a weak target signal-to-noise ratio. Because the target signal is weak, the estimation of the noise subspace in the correlation matrix decomposition will be inaccurate, so The accuracy of the above single angle measurement method is actually poor

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