摘要
利用卫星广播星历,采用坐标旋转修正Sagnac效应,获知信号传播路径;综合考虑Sagnac效应修正和双向伪距离时延差、电离层时延修正、对流层时延修正,对单向传播时延进行建模,提出一种迭代计算卫星双向时间频率传递(TWSTFT)中双向空间传播时延差的方法。利用北斗导航系统中相距3 376 km的两地面站经过位于东经140°的GEO卫星建立的C波段TWSTFT进行2 d实验。实验结果表明:相比于国际权度局推荐的计算方法,该方法能更好地反映实际双向链路的卫星双向传播时延差随卫星运动而改变的情况,并且卫星运动不但使得双向几何距离时延差(包含Sagnac效应修正)出现幅度为0.412 ns、均值偏差为77 ps的日波动,还造成了双向电离层时延差出现最大幅度为0.120 ns、均值偏差为31 ps的日波动,需从双向测量结果中扣除。
An iterative method of non-reciprocity of two-way propagation delay estimation based on signal propagation path determination by coordinate rotation for Sagnac effect correction with the knowledge of the broadcast satellite ephemeris was proposed. Not only the geometry path delay difference （including Sagnac effect correction）, but also the satellite motion effect on ionospheric correction and tropospheric correction were considered. The C-band TWSTFT via GEO satellite at E140° experiment data of two days between two ground stations apart from each other for 3 376 km was analyzed. The results show that this method can better reflect the satellite motion effect on the non-reciprocity of two-way propagation path delay than the normal method introduced by BIPM. The satellite motion induces the diurnal with the amplitude of 0.412 ns and bias of 77 ps in two-way geometry path delay difference, and the diurnal with the maximum amplitude of 0.120 ns and bias of 31 ps in two-way ionospheric delay difference.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第1期117-123,共7页
Journal of Central South University:Science and Technology
基金
教育部新世纪优秀人才支持计划项目(NCET-08-0144)
