In this paper,the method for estimating valid almanac for the GPS satellites is introduced,and for the r eceived GPS signals how the Doppler shift components impact the satellites signa ls acquisition time are analyzed.

• 本文主要讨论了GPS星有效历书的推算和接收机接收到的GPS信号的载波多普勒频移各组成部分对接收机的星捕获时间的影响 .