摘要
在卫星导航定位、天基无源定位等航天器系统构建中,需要星座具有统一的时间频率系统,即卫星间实现时间与频率同步。在分析系统对星间时间与频率同步需求的基础上,提出了在星间建立双向单程测距链路,利用伪码测量获取的星间伪距、载波测相获取的星间伪距变化率联合处理出时差、频差的算法,克服了一般双向比对方法中需要不断调整星间时差的不足,工程实现星间时差测量标准不确定度可优于1 ns,星间基准频差测量标准不确定度可优于1×10-11。
In satellite navigation positioning system or dual-satellite passive location system by time difference of arrival（TDOA） and frequency difference of arrival（FDOA） information.It is necessary for creating clock synchronization system in satellite constellation.That is realizing inter-satellite time and frequency synchronization.In this paper,on the basis of the time and frequency synchronization requirement,a design scheme by dual one way ranging in satellites is put forward and realized.This paper proposes a new algorithm on computing inter-satellite time difference and frequency difference by using pseudo-range from pseudo code measurement and pseudo-range rate from carrier phase.This algorithm can overcome the disadvantage of normal processing algorithm that needs adjust time continually.The engineering realization demonstrated the uncertainty of time difference measurement can be less than 1ns and the uncertainty of frequency difference measurement can be less than 1×10^-11.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2010年第4期1110-1117,共8页
Journal of Astronautics
关键词
卫星导航定位
天基无源定位
时差
频差
时频系统
星间链路
Satellite navigation positioning system
Passive location
Time difference
Frequency difference
Time and Frequency System
Crosslink
