Probability-Based Dynamic Calibration Method for Shipborne Satellite Communication Earth Station Tracking Phase

Abstract

The invention proposes a method for dynamically calibrating the tracking phase of a shipborne satellite communication station to improve the tracking performance of a servo system of a shipborne satellite communication station. In a dynamic environment, the azimuth tracking error voltage and the pitch tracking error voltage are generated when the servo system tracks the target. Based on the azimuth error voltage and pitch error voltage, calculate the comprehensive error angle in polar coordinates, compare the comprehensive error angle in the time series to determine clockwise or counterclockwise rotation, count the frequency of clockwise or counterclockwise rotation and calculate the probability of occurrence, and calculate the phase adjustment direction and angle. The invention has high precision of calibration and tracking phase, makes the servo system of the ship-borne satellite communication station work at the optimal phase point, and greatly improves the tracking performance; it does not need to adjust the hardware structure of the ship-borne satellite communication station, which is convenient for implementation and low in cost. The invention can also be applied to other radio equipment or systems that need to adjust the tracking phase, such as ship-borne radar, and has popularization value.

Description

technical field [0001] The invention relates to the technical field of radio tracking, in particular to a probability-based method for dynamically calibrating shipborne satellite communication earth station tracking phase. Background technique [0002] Satellite communication is the most important means for ships to communicate with ships. Due to the shaking of the ship in the ocean environment, the satellite communication earth station needs to use the servo system to realize the satellite pointing of the antenna. The servo system of the shipborne satellite communication station mostly adopts the monopulse tracking system, which has the characteristics of high tracking accuracy and strong anti-interference ability. However, various environmental factors such as temperature and humidity changes will cause changes in the tracking phase of the servo system of the shipborne satellite communication station, resulting in deterioration of cross-coupling and affecting antenna trac...

AI Technical Summary

Problems solved by technology

However, various environmental factors such as changes in temperature and humidity will cause changes in the tracking phase of the servo system of the shipborne satellite communication station, resulting in deterioration of cross-coupling and affecting antenna tracking performance.

[0003] The phase calibration methods commonly used by shipborne satellite communication stations are as follows: manual phase calibration, which needs to be carried out under static conditions, and the accuracy of calibration phase depends on the accuracy of the shipborne satellite communication station's alignment with the target center and the experience of the operator; Based on the automatic phase calibration of the earth pointing, the calibration phase accuracy of this method is low, the error is about 20°, and it is invalid in the case of large dynamics of the ship; RF-assisted phase calibration, this method needs to install a radio frequency transmission source on the shipborne satellite communication station , the reference phase needs to be provided before the phase calibration. Due to the existence of near-field effect, the phase calibration accuracy is low and the repeatability is poor; The system hardware changes greatly and the cost is high

[0004] In a dynamic environment, the traditional shipborne satellite communication station servo system phase calibration method has problems such as poor accuracy, resulting in a large cross-coupling in the servo system, which affects the servo tracking performance

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