Monopulse radar directional sensitivity calibration method and device

Abstract

The present invention discloses a monopulse radar directional sensitivity calibration method and device, and relates to the field of radar calibration. The method comprises the steps of: detecting a calibration source through monopulse radar to allow an antenna of the monopulse radar to turn around n preset sample points in order; calculating the antenna angle S1 collected by each sampling point;calculating an actual angle error SEi, and obtaining the detection angle error REi of the monopulse radar; and according to the actual angle errors SEi and the detection angle errors REi at all the sampling points, obtaining the directional sensitivity of the monopulse radar. The monopulse radar directional sensitivity calibration method and device are higher in sampling precision, most help the inspection of the symmetry of the radar directional sensitivity and the actually measured angle errors when the true angle errors are close to 0, and can ensure the smooth completion of the calibrationtask when the servo system speed index does not meet the requirement to cause low sampling precision.

Description

technical field [0001] The invention relates to the field of radar calibration, in particular to a method and device for calibration of directional sensitivity of monopulse radar. Background technique [0002] The directional sensitivity of monopulse radar is divided into azimuth directional sensitivity and pitch directional sensitivity, and these two directional sensitivities need to be determined separately. [0003] The existing method for calibrating the directional sensitivity of monopulse radar is: taking the azimuth directional sensitivity as an example, the monopulse radar tracks a fixed calibration source target with a known position, the azimuth of the calibration source is CenterA, the pitch is CenterE, and the antenna’s Point the pitch to CenterE, and change the azimuth of the antenna from CenterA's -θ A Orientation rotated to θ A direction, where θ A is the monopulse radar azimuth half-beam width, in [CenterA-θ A , CenterA+θ A ], set n sampling points on av...

AI Technical Summary

Problems solved by technology

[0005] However, existing calibration methods have serious problems

Since the servo system that controls the rotation of the monopulse radar antenna is a feedback control system, when the antenna rotates from the initial position to n sampling points in turn according to the predetermined speed, and when it rotates to the final position, its actual movement speed is characterized by slow start and gradual acceleration. , will be greater than the predetermined speed, and then slowly tend to the predetermined speed, and finally the speed will gradually slow down until it stops at the end position. It can be seen that the sampling accuracy of the radar system is not only limited by the accuracy of the angle encoder, but also by the speed transient response of the servo system Influenced by the index and speed accuracy, the antenna angle obtained by the existing calibration method in the calibration process is usually not guaranteed to be the closest to the predetermined sampling point

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