基于用户和卫星概略位置的信号传播时延估计

Estimation of signal′s propagation delay time based on user and satellite′s coarse positions

辅助长码直捕的一个最重要的先验信息是时间信息,卫星信号传播时延估计是减少时域搜索范围的一个重要方面。针对地面静止用户,给出了基于用户和卫星概略位置的卫星信号传播时延估计算法,并指出用户和卫星位置误差对传播时延的影响可以分离计算。数值计算表明,即使用户和卫星的位置误差均达到1000km,也能将传播时延不确定范围压缩一半。

Time is important information for fast and direct acquisition of military code, and compression of signal＇s propagation delay time uncertainty is an effective means for it. Taking ground stationary user as the subject, calculation and estimation of propagation delay time is studied. It is found that delay time errors caused by position errors of user and satellite could be separated. Simulation results indicate that this algorithm can reduce the uncertainty range to the half even if both the user and the satellite have position errors of 1000km.