Method and apparatus for estimating GPS time

提供了一种从非GPS定时信息中提供GPS时间估计值的方法，其中非GPS定时信息存在于基站(BS1)发送到第一移动通信设备(MS1)的通信信号中，该方法包括步骤：(i)在一个第二移动通信设备(MS2)中，接收存在于基站所发送通信信号中的相应的非GPS定时信号；(ii)在第二移动通信设备(MS2)的一个GPS接收机(23，24)中，获取至少一个到达一个到GPS卫星的伪距，以及获取GPS时间的第一估计值；(iii)导出在步骤(i)中接收到的定时信号的接收与在步骤(ii)中得到的GPS时间估计值之间的关系；以及(iv)从第一移动通信设备(MS1)接收的非GPS定时信息以及从步骤(iii)中导出的关系中计算GPS时间的第二估计值。 A method of providing an estimate of GPS time from non-GPS timing information present in communications signals transmitted from a base station (BS1) to a first mobile communications device (MS1) is provided comprising the steps of (i) in a second mobile communications device (MS2), receiving corresponding non-GPS timing signals present in communications signals transmitted by the base station; (ii) in a GPS receiver (23, 24) of the second mobile communications device (MS2), obtaining at least one pseudorange to a GPS satellite (GPS SV) and obtaining an first estimate of GPS time; (iii) deriving a relationship between the receipt of timing signals received in step (i) and the estimate of GPS time obtained in step (ii); and (iv) from the non-GPS timing information received by the first mobile communications device (MS1) and the relationship derived in step (iii), calculating a second estimate of GPS time.