地面站频率不稳定对航天器跟踪性能影响的分析  

Influence analysis of instable frequency of ground stations on tracking performance of spacecrafts

作　　者：刘海颖[1] 杨宇晓[1] 丁尚文[1] 冯成涛[1] 

机构地区：[1]南京航空航天大学高新技术研究院,江苏南京210016

出　　处：《系统工程与电子技术》2010年第4期816-819,共4页Systems Engineering and Electronics

基　　金：教育部博士学科点专项科研基金(20070287007);南京航空航天大学引进人才基金(4015908331)资助课题

摘　　要：针对地面站的频率标准对航天器跟踪性能影响的问题,采用双向跟踪模式建立了多普勒测速跟踪系统模型。研究了频率标准的确定性和随机性起伏对无线电多普勒测量的影响。分析表明,时间统一系统的不准确和不稳定导致的频率标准不理想,是无线电跟踪测量的主要误差源,进一步推导了Allan方差、取样时间以及电波往返传输时间与地面站系统多普勒测速精度的关系。通过铷、铯、氢原子频率标准的仿真实验,验证了分析方法的有效性。Aiming at the problem of effects for spacecraft＇s tracking performance due to ground station frequency standards,a Doppler velocity tracking model is established based on two-way tracking modes.The effects for Doppler tracking due to the determinative and random deviations of frequency standards are researched,and the analysis illustrates that frequency standards imperfections caused by inaccuracies and instabilities of timing are the primary error sources for radiometric tracking.The relations of Allan variance,averag-ing time and round trip light time are deduced.Finally,the effectiveness is demonstrated by simulations using Rubidium,Cesium and Hydrogen atom frequency standards.

关 键 词：无线电跟踪系统 地面站 航天器 频率基准 ALLAN方差 

分 类 号：V556.1[航空宇航科学与技术—人机与环境工程]