Pulse Doppler Radar and Beamforming Method Based on Pattern Search Algorithm

Abstract

The present invention proposes a pulse Doppler radar and a beamforming method based on a pattern search algorithm, including: S1: measure the radar receiving gain of the front-end array of the radar phased array according to different azimuth angles and elevation angles, and obtain different array element receiving antennas Direction diagram; S2: Initialize numbers and beamforming coefficients, design different search step sizes, determine basis vectors for different search directions, and initialize convergence conditions; S3: Determine and beamforming coefficient objective function by sum beam distribution characteristics; S4: Solve sum beam The generation coefficient corresponds to the objective function value, and judges whether the objective function meets the convergence condition; S5: Use different step lengths and base vectors to obtain different sum beamforming coefficients and corresponding objective function values, and select the sum beamforming coefficient that minimizes the objective function value as the final The result is output. The invention synthesizes ideal and channel antenna patterns through a mode search optimization method.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a pulse Doppler radar based on a pattern search algorithm and a beam forming method. Background technique [0002] Radar is radio detection and ranging. As the name implies, one of the basic functions of radar is target detection. When the radar completes the digital beamforming function, it is generally assumed that the front-end of the radar phased array has completed the calibration of the amplitude and phase consistency of each array element, that is, there is no difference in amplitude and phase between each array element, but in actual engineering applications, Due to the inconsistency of the manufacturing components or manufacturing processes of each array element, the echo amplitude and phase of each array element will have certain differences. Under the condition of amplitude and phase differences, if the traditional "sum beam" forming method is used, the synthesized The ...

AI Technical Summary

Problems solved by technology

When the radar completes the digital beamforming function, it is generally assumed that the front-end of the radar phased array has completed the calibration of the amplitude and phase consistency of each array element, that is, there is no difference in amplitude and phase between each array element, but in actual engineering applications, Due to the inconsistency of the manufacturing components or manufacturing processes of each array element, the echo amplitude and phase of each array element will have certain differences. Under the condition of amplitude and phase differences, if the traditional "sum beam" forming method is used, the synthesized The beam may have the problem of asymmetry of the main lobe and attenuation of the main lobe gain

The attenuation of the main lobe gain will lead to the attenuation of radar detection power, and the asymmetry of the main lobe will lead to a decrease in the accuracy of subsequent radar angle measurement. "Has important engineering application value

Images