Method for correcting azimuth beam center of mechanical-sweeping radar based on servo rotating speed

Abstract

The invention relates to the technical field of radar data processing and particularly relates to a mechanical-sweeping radar azimuth beam center correction method based on servo rotating speed. The method comprises the following steps of assuming that a corrected equivalent beam center is an angle before signal processing as an angle after signal processing, and defining an azimuth beam center correction coefficient as alpha, according to angles of a servo before and after signal processing and based on the coherent processing interval and the signal processing time, an equivalent azimuth beam center is calculated, and the specific calculation method is that the equivalent beam center is obtained by weighting an angle of an initial servo of the coherent processing interval and an angle of a servo after signal processing is finished; and the azimuth correction weighting coefficient of the equivalent beam center is calculated based on the coherent processing interval and the signal processing time, so the system angle deviation introduced by the rotation of the antenna in the mechanical sweeping radar can be effectively corrected, and azimuth angle measurement precision is effectively improved.

Description

technical field [0001] The invention relates to the technical field of radar data processing, in particular to a method for correcting the azimuth beam center of a machine-scanned radar based on a servo rotational speed. Background technique [0002] The existing one-dimensional phased-array radar with azimuth machine-scanning and pitching-electrical-scanning systems generally adopts the method of sum-difference ratio-amplitude angle measurement in azimuth to improve the accuracy of angle measurement. However, during the scanning of the azimuth beam, the rotation of the antenna will cause the beam center to change, and the position of the target relative to the beam center will change, that is, within a coherent processing interval (Coherent Processing Interval, CPI), each pulse repeats The position of the target relative to the beam center within the interval (Pulse Repetition Interval, PRI) is different. [0003] For radars that use the sum-difference ratio to measure the...

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Problems solved by technology

[0005] In the formula, is the beam center; is the offset angle of the target relative to the beam center. The offset angle is calculated by the sum and difference ratio. The rotation of the antenna will introduce additional system angle deviation, which will affect the azimuth beam center, thereby affecting the accuracy of azimuth angle measurement.

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