Pulse Doppler radar based on mode search algorithm and beam forming method

Abstract

The invention provides a pulse Doppler radar based on a mode search algorithm and a beam forming method, and the method comprises the steps: S1, measuring radar receiving gains of a front end array plane of a radar phased array according to different azimuth angles and pitch angles, and obtaining receiving antenna directional diagrams of different array elements; S2, initializing numbers and wavebeam generation coefficients, designing different search step lengths, determining base vectors in different search directions, and initializing convergence conditions; S3, determining a sum beam generation coefficient objective function according to the sum beam distribution characteristics; S4, solving a target function value corresponding to the beam generation coefficients, and judging whetherthe target function reaches a convergence condition or not; and S5, obtaining different sum beam generation coefficients and corresponding target function values by using the different step lengths and the base vectors, and selecting the sum beam generation coefficient enabling the target function value to be minimum as a final result to be output. According to the invention, an ideal and channelantenna pattern is synthesized 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

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