一种船载天线跟踪卫星的方法

A method for the ship-board antenna to track satellites

为了实现船载天线与同步通讯卫星的通讯 ,根据坐标变换原理和实际使用要求 ,提出了数引闭环、电平开环的跟踪方法 .该方法根据卫星和轮船的位置 ,直接计算出天线的指向角度 ,依据此角度值形成直流电平 ,控制天线伺服执行系统 ,使天线指向卫星 .经理论分析 ,其跟踪指向误差为± 1.6 5°,经实验测试 ,其跟踪指向误差为± 3.4° ,满足± 6°的跟踪指向精度要求 .如果在计算中考虑航偏、卫星漂移等因素 ,并提高计算速度 ,还可以提高天线的跟踪指向精度 .

In order to achieve the communication between the ship board antenna and the synchronous communication satellite, a method by the digital guiding closed loop and level open loop tracker is presented. On the basis of the principle of coordinate transformation and the requirement for practical use. By this method, the pointing angle of antenna can be directly calculated in the light of a satellites and the ships position. Then according to this angle, the DC level is formed to control the servo executive system which makes the antenna point to the satellite. Its tracking pointing error is reduced to ±1.65° by theoretical analysis and ±3.4° by experimental verification. The requirement for tracking pointing precision which is within ±6° is satisfied. In addition, if the course offset and satellite excursion are considered in the calculation and the operation speed is increased, the tracking pointing precision can be raised even more.