微带天线对GPS卫星的可视性计算方法

在空中高动态飞行的旋转载体内GPS接收微带天线安装于载体内随动平台上是一较佳的选择方案，载体本身和地球是影响该微带天线对GPS卫星可视与否的主要因素。针对此，在坐标转换理论的基础上，结合载体的飞行环境，从理论的角度推导了在载体和地球遮挡下，微带天线对卫星的可视性条件及计算方法；结合GPS卫星在轨位置预测公式和某一载体在某一时间段内的轨道参数，对微带天线对卫星的可视性进行了仿真，给出了载体飞行过程中微带天线可视的卫星。

Computation Method and Simulation of GPS Visibility to Micro-strip Antenna

For the complex and large - scale electronic system, setting up the simulation system in the laboratory is one main part of the system design. Besides, the computation of GPS visibility to the spacecraft is one part of the design for the simulation system. For a fast revolving spacecraft, in order to receive better and reliable GPS wireless information, fixing the micro-strip antenna on the plat controlled by the information of INS is a better scheme, the plat is kept stable or rotating slowly relative to a reference system. Under this case, the earth and the spacecraft are the main factors to keep the spacecraft out of GPS. In this paper, based on the theory of the coordinate transformation, the computation method of GPS visibility to the spacecraft under the shade of the earth and the spacecraft is deduced, and the precondition of GPS visibility is given. The simulation computation model of GPS visibility is presented, and some simulation results of GPS visibility to specific flight time of the spacecraft are given.