一阶扩展差分方法在测站GPS时间误差修正中的应用

摘要

By introducing and analyzing the principle about Global positioning system ( GPS ) time measured ,time error measured and time error eliminated by difference method, the idea which lessens time error and improves time precision is proposed by applying to two GPS receivers in TT&C station. Based on the above idea, the extended first-order difference model is put forward. By using this method, accurate GPS time for TT&C system can be calculated and the time difference of any two TT&C subsys-tems in station can be synchronized.%分析了全球定位系统(简称GPS)时间测量原理、时间测定误差和差分误差消除模型，给出了在航天测控站两套GPS授时系统应用一阶差分方法，即站间单差定位方法，减小误差，提高时间准确度的思路方法，并提出了多站站间单差定位的一阶扩展差分模型。该模型可以用来获取测站多套GPS授时系统的精确时间和任意2个系统时钟同步误差比对。