卫星群时延特性测量新方案的设计和实现  

Design and Implementation of a Novel Method for Satellite Group Delay Measurement

作　　者：刘彬[1] 刘枫[1] 刘崇华[1] 

机构地区：[1]北京空间飞行器总体设计部,北京100094

出　　处：《航天器工程》2010年第1期77-81,共5页Spacecraft Engineering

基　　金：国家重大科技专项工程

摘　　要：设计并实现了适用于卫星整星综合测试的群时延测量新方案。与传统模拟解调方案相比,此方案对信号采样后直接进行数字信号处理,采用数字解调、估计相位的方式测量群时延,减小了引入的噪声和对信号的畸变,适用于不同卫星的群时延特性测试,省去了时间差测试设备,降低了测试成本。实际测试结果表明,此方案在C频段的测量精度小于1ns,UHF频段的测量精度小于16ns,满足卫星群时延测试要求,为卫星测试的自动化、通用化奠定了基础。This paper gives a novel method for satellite group delay measurement.The method has the characteristics of generalization,automatization,high accuracy and low cost.Compared to conventional analog demodulation,it is based on digital signal sampling,digital demodulation and phase estimation.It reduces noise and signal distortion.It is suitable for various satellite group delay measurements,which exempts from time measuring instruments and reduces test cost.The test results show that the accuracy is 1ns at C band and 16ns at UHF band,which satisfies satellite testing requirements.It makes a contribution to the generalization and automatization of the satellite testing.

关 键 词：卫星测试 FM解调 群时延 

分 类 号：V416[航空宇航科学与技术—航空宇航推进理论与工程]