Pointing error calibration method for sum and difference channels of antenna
A pointing error and calibration method technology, which is applied in the field of aerospace measurement and control, can solve the problems of antenna tracking accuracy out of tolerance, and achieve the effects of improving accuracy, reducing antenna tracking error, and eliminating pointing error
Active Publication Date: 2016-06-22
UNIT 63756 OF PLA
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[0005] In order to solve the problem of correcting the antenna pointing error by using the radio star-based antenna pointing correction method in the prior art, the antenna tracking accuracy will exceed In order to solve the poor problem, a method for calibrating the pointing error of the antenna and the poor channel is proposed
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[0041] The present invention selects the sun or a satellite in synchronous orbit as the signal source of the sum-difference channel without tower calibration, adopts antenna raster scanning combined with three-dimensional pattern imaging technology to obtain the three-dimensional pattern of the sum-difference channel respectively, and adopts a precision measurement algorithm for the amount of misses based on elliptic curve fitting, respectively. The sum and difference patterns are centered respectively. The specific implementation steps are as follows:
[0042] (1) Set the antenna scanning range and scanning speed according to the antenna performance index and the sampling rate of the antenna system angle.
[0043] (2) Calculate the azimuth step amount, fix the azimuth angle, and perform scanning step calculation from top to bottom (or from bottom to top) in pitch.
[0044] (3) When the pitch scans from the bottom (or top), the azimuth is stepped by the calculated azimuth ste...
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The invention discloses a pointing error calibration method for sum and difference channels of an antenna. The method comprises the following steps: firstly, setting a certain scanning range and a certain scanning speed according to antenna parameters by using a grating scanning technology, and controlling an antenna to perform grating scanning to respectively acquire real-time angle and power data of sum and difference channels of the antenna to form a three-dimensional directional diagram of the antenna; secondly, respectively capturing the angle data of the sum and difference channels within a certain power range by using two threshold values to generate azimuth pitch two-dimensional elliptical curves; and finally, fitting the acquired elliptical curves of a sum and a difference according to the principle of least squares by using a wild value culling method, and positioning the center to obtain target-missing quantities of the sum and difference channels to calculate corresponding pointing errors of the sum and difference channels. The method is applicable to both the field of astro observation and the field of spaceflight test control. According to the pointing error calibration method for the sum and difference channels of the antenna, the antenna tracking error is reduced, and the equipment tracking precision is improved.
Description
technical field [0001] The invention relates to a method for calibrating the pointing error of an antenna and a difference channel, in particular to a tower-free calibration of the pointing error of a sum and difference channel by a monopulse antenna in the field of aerospace measurement and control using a source such as a synchronous orbit satellite or the sun. Background technique [0002] Antenna pointing correction is widely used in the field of radio astronomy observation. Through pointing correction, the main beam of the astronomical telescope can be accurately directed to the observed celestial body, which can ensure that the antenna can receive the strongest observation signal. [0003] In the field of radio tracking and measurement, monopulse antennas are usually designed with two channels, the sum channel is used to receive artificial satellites or cooperative target downlink signals for information demodulation processing, and the tracking channel is used to reali...
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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 李玉瑄刘光平周涤宇梁波黄春平邱德敏邵军飞陈华李波孙凯李燕
Owner UNIT 63756 OF PLA