CDAS 20m 天线分系统设计

THE DESIGN OF CDAS 20m ANTENNA SUBSYSTEM

ＣＤＡＳ天线分系统主要由天线机械结构、馈电网络、天线控制及微机监控几部分组成。天线采用２０ｍ卡塞格伦式天线，馈源为波纹喇叭，多模单脉冲自跟踪方案；利用轴角编码器构成伺服位置环；由三相可控硅功放及伺服直流电机驱动天线；双电机克服齿隙影响；天线具有多种工作方式，操控方便；监控微机对系统统一监控并完成故障实时在线检测功能。

This paper introduces the configuration,characteristics and system design of the antenna subsystem,which meets relevant requirements of the Command and Data Acquisition Station (CADS) of FY2 China′s first geostationary meteorological satellite.CDAS antenna subsystem mainly consist of antenna mechanical Structure,feed network,antenna control unit (ACU) and monitoredcontrol (MAC).This antenna is a 20m modified cassegrain antenna,its feed is a corrugated horn,and adopts multiplemoulding autotrack monopulse method.The servo position loop consists of the angle encoder.Antenna is driven by 3phase SCR and servoDC motor.The backlash is eliminated by using dualmotor.ACU has multipleoperation modes and is easy controlled.ACU monitors working parameters and status of system,and detects the errors online.