Mobile satellite communication antenna polarization tracking method and tracking system

Abstract

The invention provides a polarization tracking method and tracking system for a mobile satellite communication antenna. The system comprises the satellite communication antenna comprising a receiving antenna and a transmitting antenna which are used for receiving and transmitting orthogonal polarization satellite signals respectively; a polarization isolation degree measurement portion which is used for obtaining and measuring signal levels of the pair of orthogonal polarization signals, calculating the ratio of the obtained signal levels and making a comparison between the ratio and the predetermined threshold value; and a tracking control portion which is used for controlling the antenna to emit and receive polarization angle adjustment synchronously according to the comparison result output from polarization isolation degree measurement portion. The polarization isolation degree measurement portion comprises an orthogonal polarization signal decomposition portion which is used for carrying out decomposing processing to generate a pair of mutually-orthogonal polarization signals according to satellite signals received from the receiving antenna.

Description

technical field [0001] The present invention relates to a polarization tracking method and tracking system of a mobile satellite / microwave communication antenna, in particular to a method and a system for tracking and aligning satellites by performing control based on the polarization isolation of satellite antennas. Background technique [0002] Mobile Communication is the abbreviation of "Moving Satellite Ground Station Communication System". Through the mobile communication system, vehicles, ships, aircraft and other mobile carriers can track satellites and other platforms in real time during the movement process, and continuously transmit multimedia information such as voice, data, images, etc., which can meet various military and civilian emergency communication and mobile conditions Under the needs of multimedia communication. [0003] Compared with the fixed satellite communication system, the key link of the mobile satellite communication system is the fully automat...

AI Technical Summary

Problems solved by technology

[0012] The main problem of the above-mentioned method is that in the case that the antenna cannot self-measure the polarization angle or the polarization angle error, it has to be calculated indirectly, because the relationship between the physical quantity used in the calculation and the polarization angle is too indirect, Or it is not sensitive enough, and the calculated polarization angle or polarization angle deviation cannot be measured and verified in the end, so the measurement error, calculation error, and execution error are difficult to measure, and closed-loop error control cannot be performed, resulting in large errors. It is difficult for the system to achieve high tracking accuracy

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