单脉冲自跟踪体制在车载“动中通”的应用

Application of the monopulse tacking system to "communication in moving

根据车载"动中通"在卫星通信中的特点,针对该车载站在移动过程中,天线偏离卫星的情况,研究了单脉冲跟踪体制。由于单脉冲跟踪具有实时性好,跟踪精度高的优点,所以在Ku频段具体应用于车载"动中通"中。阐述了单脉冲自跟踪的原理、系统组成以及系统的具体实现方案。实验测试表明,该系统能够获得较高的跟踪精度和跟踪实时性,能够使天线稳定地对准卫星。

The monopulse tracking system is studied and applied to 'communication in moving'in Ku band. Monopulse tracking, which is based on output error signal of antenna feed system, controls antenna to track a satellite. Five-horn feed of antenna feed system generates sum and difference RF signals reflection angular error. RF signal is converted into 70MHz IF signal by RF processing system. Then azimuth error signal and pitch error signal in the IF signal are separated by IF processing system. At last, the servo system, which is based on the direction and amplitude of difference signal, drives antenna to rotate in real time. The above parts form a closed loop system to complete antenna angle tracking. The experimental result shows that the system has a high tracking precision and operates in real time, and its antenna points to satellite quickly and stably, thus communication in moving is completed.