Patent ID: 9645247
Date: 2017-05-09
CPC Classifications: G01S,G04R

Claim:
1. A method for estimating the coordinated universal time (UTC), the method comprising: receiving, by a satellite navigation receiver, first global navigation satellite service (GNSS) signals broadcast by a satellite of a GNSS that encode a first time of week (TOW) value; estimating a first week number (WN) value and a first relationship between the UTC and a reference time of an onboard clock of the satellite (OFFSET) from time parameter values stored at the satellite navigation receiver; and determining a first estimate of the UTC based on the first TOW value, the first WN value, and the first OFFSET value; wherein prior to receiving the first GNSS signals, the method further comprises: receiving second GNSS signals that encode a second TOW value, a second WN value, and a second OFFSET; determining that a GNSS connection for the satellite navigation receiver has been lost; and in response to determining that the GNSS connection has been lost, storing the second TOW value, the second WN value, and the second OFFSET at a non-volatile memory; wherein the second TOW value, the second WN value, and the second OFFSET stored at the non-volatile memory are utilized to determine the time parameter values stored at the satellite navigation receiver.