机载卫星通信天线的步进跟踪应用

机载卫星通信天线采用步进跟踪方法是为了解决单脉冲跟踪天线网络复杂和校相不稳,以及程引时惯导漂移导致天线指向偏差等问题而设计的;机载卫星通信天线步进跟踪方法是在程序引导基础上的步进跟踪,即伺服控制系统根据惯导、星位和飞机经纬度计算天线指向,并叠加步进跟踪以保证天线精确跟踪卫星。由于步进跟踪是时段控制,天线跟踪精度不高,一般能达到1/6半功率波束宽度以上精度。实际使用中,当机载存在惯导较大漂移时天线仍能长时间稳定跟踪卫星,这说明机载卫星通信天线程引基础上的步进跟踪方法可行有效。

Application of Step Tracking Algorithm for Airborne Satellite Communication Antenna

In order to solve the problems such as antenna network complexity and phase calibration instability in mono-pulse tracking and pointing deviation due to inertial navigation system drifts error in program guidance tracking,the step tracking algorithm is designed and adopted in airborne satellite communication antenna. The step tracking method of airborne satellite communication antenna is based on program guidance tracking,that is to say,the servo control system calculates the antenna pointing according to inertial navigation system,satellite position,longitude and latitude of airplane and the step tracking method is aided to ensure that the antenna can track satellite accurately. Because of time period control in step tracking,the antenna tracking accuracy is low,which can be up to 1 /6half power beam width usually. In practice,if the antenna is still able to track satellite stably when inertial navigation system drifts error is larger,it indicates that program guidance aided with step tracking method in airborne satellite communication antenna is available.