摘要
卫星群延时间参数(Timing Group Delay,TGD)表征了卫星不同频率信号通道之间的延迟偏差,一般作为重要的信息在卫星导航系统的广播星历中播发给用户.由于不同卫星导航系统广播星历中的钟差定义的不同,卫星TGD参数的含义也有所差异,用户在利用广播星历进行定位授时中必须正确理解并使用广播星历卫星钟差与各个频率信号的TGD改正参数.本文针对GPS和北斗卫星导航系统(BDS),分别使用无电离层组合和单频观测对TGD参数在定位中的影响进行计算和分析,通过比较分析指出了目前北斗广播星历中的TGD可能存在一些问题需要进一步调查.
Timing Group Delay（TGD） refers to the delay bias between different frequency signal channel of satellite,and general transmit to users look upon as important information through the broadcast ephemeris of satellite navigation system.Because definitions of clock offset are not the same in different satellite navigation system,meaning that the TGD parameter also vary,therefore,when users make use of the broadcast to positioning and timing,they must have a deep understanding of broadcast clock offset and TGD correction parameter in each frequency.In this paper,we analyse the impact of TGD parameter on single point positioning for GPS and beidou satellite system（BDS） using the ionosphere-free combination and single-frequency observations,respectively.Through a comparative analysis,it shows that currently the TGD in BDS broadcast may have some problems needing for further investigation.
出处
《湖北民族学院学报（自然科学版）》
CAS
2015年第1期109-113,116,共6页
Journal of Hubei Minzu University(Natural Science Edition)
基金
国家自然科学基金项目(41404010)
