Patent ID: 9274227
Filing Date: 2016-03-01
CPC Classification: G01S

Claim Text:
1. A global navigation satellite system (“GNSS”) positioning method, comprising the steps of: transmitting a GNSS radio signal comprising a navigation message that is transmitted as a sequence of frames; including a plurality of subframes within each frame, wherein each subframe contains a first set of ephemeris and clock correction data sufficient for computing a satellite position and a satellite clock error; including a second set of ephemeris and clock correction data within each subframe, more compact than the first set of ephemeris and clock correction data, but sufficient for computing said satellite position and said satellite clock error to a lesser degree of accuracy; and including at least two copies of the second ephemeris and clock correction data within each subframe, such that a timing difference between two consecutive copies does not exceed 70% of a subframe duration.