摘要
影响GPS共视时间比对的一种因素是卫星的位置误差,这个影响程度取决于用户对卫星的观测仰角和用户间的基线长度。当两个用户的仰角大致相同时,卫星位置误差对时间比对的影响与基线长度近似成正比,而与仰角的大小几乎无关。当两个仰角不同时,对于小于2500km的基线,两个仰角之差越小,这种影响就越小。对于5000km以内的基线,无论多大的仰角,时间比对的误差最多相当于卫星位置等价误差(卫星位置误差除以信号传播速度)的四分之一。
A factor affecting the accuracy of GPS common-view time transfer is the satellite position error. The effect extent depends on the elevation and the length of baseline. When the two elevations are the same, a longer baseline increases the effect of the satellite position error on the time transfer, and the effect is approximately proportional to the baseline length. When the two elevations are different, a smaller difference between elevations leads to a smaller effect when baselines is less than 2 500 kin. For a baseline is less than 5 000 km, whatever elevations are used, the time transfer error is no more than a quarter of the satellite position error divided by the speed of light.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2009年第8期968-970,共3页
Geomatics and Information Science of Wuhan University
基金
西安文理学院重点人才基金资助项目(08042002)
关键词
时间比对
GPS共视
基线
仰角
time transfer GPS common view
baseline
elevation
