Resilient ephemeris decoding of gnss satellite information

A method, comprising:

• in a positioning system:
• decoding first ephemeris data of a satellite in a Global Navigation Satellite System (GNSS) satellite constellation;
• estimating a first position of the satellite based on the decoded first ephemeris data, wherein the satellite is estimated to be at the first position at a first time-instant;
• estimating a deviation between the estimated first position of the satellite and a position where the satellite is expected to be at the first time-instant;
• determining the estimated deviation to be above a threshold;
• excluding use of the estimated first position of the satellite in a position fixing operation of the positioning system based on the determination;
• decoding second ephemeris data of the satellite based on the exclusion;
• estimating a second position of the satellite based on the decoded second ephemeris data,
• wherein the satellite is estimated to be at the second position at a second time-instant;
• and
• controlling a position filter of the positioning system to use the estimated second position of the satellite in the position fixing operation.

A non-transitory computer-readable medium having stored thereon, computer-executable instructions which, when executed by a positioning system, causes the positioning system to execute operations, the operations comprising:

• decoding first ephemeris data of a satellite in a Global Navigation Satellite System (GNSS) satellite constellation;
• estimating a first position of the satellite based on the decoded first ephemeris data, wherein the satellite is estimated to be at the first position at a first time-instant;
• estimating a deviation between the estimated first position of the satellite and a position where the satellite is expected to be at the first time-instant;
• determining the estimated deviation to be above a threshold;
• excluding use of the estimated first position of the satellite in a position fixing operation of the positioning system based on the determination;
• decoding second ephemeris data of the satellite based on the exclusion;
• estimating a second position of the satellite based on the decoded second ephemeris data,
• wherein the satellite is estimated to be at the second position at a second time-instant;
• and
• controlling a position filter of the positioning system to use the estimated second position of the satellite in the position fixing operation.