Patent ID: 8456359
Filing Date: 2013-06-04
Classification: G01S,H03M

Abstract:
1. A method of communicating satellite observable information from a global navigation satellite system (GNSS) apparatus comprising: determining at the GNSS apparatus which satellites in a constellation of satellites have been continuously tracked over at least two time periods to identify satellites which have been continuously tracked over a first time period of the at least two time periods, and to identify satellites which have been continuously tracked over a second time period of the at least two time periods; determining an elevation value for each satellite which has been continuously tracked over the first time period; transmitting from the GNSS apparatus a message which does not include the elevation values of all of the satellites which have been continuously tracked over the at least two time periods, but the message does include one elevation value of the satellites which have been continuously tracked over the first time period, and wherein: the one elevation value is the elevation value of the lowest satellite which has been continuously tracked over the first time period; and the message comprises a first indicator in a first portion of the message specifying whether at least a second portion of the message includes master and minor continuous tracking information.