基于天通卫星的天线精确对星角度算法改进

基于板载惯导模块的高精确度接收机提供的定位信息和姿态信息，通过旋转坐标系的方法，推导出地理坐标系下天线对星角度，并对现有的天线对星数学模型进行改进，引入地球卯酉圈曲率半径和天线高度，提高了地理坐标系下天线指向角度的精确度。另外，引入姿态信息，建立载体坐标系下天线对星角度模型，减少载体姿态变化带来的影响。最后通过仿真实验表明，改进的算法在一定程度上提高了对星角度的精确度。

Improvement of precision alignment algorithm for antenna based on Tiantong Satellite

Based on the positioning information and attitude information provided by the high-precision receiver with the inertial navigation module, through the space rotation coordination system method, the satellite angle in the geographic coordinate system is deduced, and the existing antenna-satellite mathematical model is improved. The radius of curvature of the earth''s ring and the height of the antenna are introduced, which improves the accuracy of the antenna pointing angle in the geographic coordinate system. In addition, the attitude information is introduced, and the antenna-satellite angle model in the carrier coordinate system is established to reduce the influence of the carrier attitude. Finally, the simulation results show that the improved algorithm model can improve the accuracy of the antenna pointing angle to some extent.