Initializing method of mobile satellite communication antenna

Abstract

The invention relates to an initializing method of a mobile satellite communication antenna. According to the method, the mobile satellite communication antenna provided with a low-cost inertia navigation system can fast align a satellite and accurately estimate an initial course angle of the low-cost inertia navigation system. The method comprises the steps of: firstly calculating a satellite searching instruction by utilizing the initial course and gesture information of the low-cost inertia navigation system, then controlling a pitch axis and a polarization axis of the antenna to rotate according to calculated pitch instruction angle and polarization instruction angle; controlling an azimuth axis to scan between 0 and 360 degrees at a constant speed, and finding out an accurate course instruction angle through a satellite beacon recognition technology; accurately estimating the initial course angle error of the low-cost inertia navigation system by utilizing three-coordinate calculation and an iterative algorithm; finally calculating the satellite searching instruction of the antenna again according to the estimated inertia navigation course and gesture information, and controlling the antenna to rotate according to the instruction angle and accurately align the satellite. After finishing initialization of the antenna by using the method, the antenna can track the satellite in real time with high precision.

Description

technical field [0001] The application relates to an initialization method of a mobile satellite communication antenna, and relates to the fields of automatic control, inertial navigation and mobile satellite communication. The method described in this application can be widely applied to various mobile satellite communication devices, such as vehicle-mounted, ship-mounted, and airborne mobile satellite communication antennas. Background technique [0002] Mobile satellite communication equipment can make the satellite antenna always align with the geosynchronous satellite on the moving carrier, realize high-bandwidth real-time image and data transmission, and have a very wide application prospect in national defense, frontier defense, anti-terrorism, emergency relief, government and other departments. [0003] The mobile satellite communication antenna consists of two parts: the antenna feed system and the servo control system. Antenna feeder system includes antenna surfac...

AI Technical Summary

Problems solved by technology

This solution has high requirements on the inertial navigation system. In order to ensure that the antenna can lock the largest satellite signal, the autonomous north-seeking accuracy of the inertial navigation system must reach more than 0.1°, and the cost of such a high-precision inertial navigation system has far exceeded The cost of the mobile satellite communication antenna itself is unaffordable for most development units and users

In order to effectively reduce the cost, a low-precision vehicle-mounted inertial navigation system must be selected, and the low-precision inertial navigation system cannot autonomously find the north to output the correct heading. Therefore, the antenna cannot obtain accurate star-to-star command angles.

In order to solve the problem of initializing mobile satellite communication antennas based on low-precision inertial navigation, most research and development units currently use antenna azimuth axis 0°-360° scanning and satellite beacon signal peak recognition technology to realize antenna star searching, but it is still not very good. It solves the problem of calculating the initial heading of the inertial navigation system using the auxiliary information of star-seeking, especially when the carrier with the antenna is at a large pitch angle or large roll angle, the heading error of the inertial navigation system estimated by the existing methods is relatively large. Large, so that the tracking performance of the mobile satellite communication antenna is greatly reduced

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