温变条件下抛物面天线时延特性研究

Research on Time Delay Characteristic of Parabolic Antenna along with Temperature Variety

在卫星导航应用中,设备时延是抛物面天线的重要参数之一,时延的稳定性会影响卫星导航系统的定位、导航和授时业务精度,而工作环境温度是影响天线时延稳定特性的主要因素。从抛物面天线在卫星导航工程应用需求出发,分析抛物面天线的相位中心和设备时延参数,根据天线基本结构和信号传输原理,分光程段、馈源段和馈线段3部分对天线在温度变化条件下的时延特性进行分析研究。分析结果表明,温度变化对滤波器时延的影响是决定天线时延稳定性的重要因素,对GNSS系统抛物面天线结构设计具有指导意义。

Time delay is one of main parameters for a parabolic antenna in Globe Navigation Satellite System （GNSS）.The stability of time delay influences the precision of Position,Navigation and Timing （PNT） services.The temperature is the key fator that influences the characteristic of antenna＇s time delay.According to the requirement of GNSS,the paper analyses phase center and time delay of the parabolic antenna in GNSS,and then studies the characteristic of time delay of parabolic antenna along with temperature variety based on the configuration of parabolic antenna.The analysis result indicates that the effect of temperature variety on filter time delay is key factor of deciding antenna time delay stability.The paper gives the guidance to parabolic antenna structure design and manufacture.