星载单通道单脉冲自跟踪系统设计

Design of a Spaceborne Single- channel Monopulse Autotracking System

对中继卫星的捕获跟踪是建立星间数据链路首要前提,星载自跟踪系统有着广泛的应用前景。针对Ka频段波束窄、星载设备小型化要求高等特点,提出了星载自跟踪系统设计方案。方案采用单通道单脉冲方式,利用TE21模馈源技术从天线获取自跟踪信号,通过微波前端模块将信号调制、合并为单通道,然后在捕获跟踪接收机中提取误差角度,实现天线角度的精确跟踪。经过链路分析,证明系统设计有效可行。根据方案研制出原理样机并进行了试验验证,跟踪精度在X、Y方向优于±0.05°,满足星间链路跟踪精度要求。

Capturing and tracking for TDRS( Tracking and Data Relay Satellite) is the primary precondition of establishing the data links between satellites. There are more requirements for the automatic tracking system. In view of the narrow beam in Ka-band and the strict requirement of the pint-sized equipment by satellites,an autotracking system design for satellites is proposed with single-channel monopulse method. In the design,autotracking signals can be obtained by the TE21-mode feed of antenna. The signals are modulated and combined by the microwave front module. Then,error angle can be extracted in the receiver to achieve accurate tracking of the antenna. Link analysis proves that the system design is feasible. The sys-tem prototype is developed and tested. The tracking accuracy in X and Y direction is better than ±0. 05°, which meets the requirement of inter-satellite link.