Use of wide area reference receiver network data to mitigate local area error sources
US9989644B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 2016 |
| Grant date | Jun 5, 2018 |
| Priority date | — |
| Expiry date | Oct 28, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system to mitigate errors in GPS corrections and ephemeris uncertainty data broadcast to a vehicle is presented. The system includes reference receivers in a first ground subsystem and a processor. The processor: receives, from reference receivers in a wide area network of reference receivers, satellite measurement data for a first plurality of satellites and receives, from the reference receivers in the first ground subsystem, satellite measurement data and ephemeris data from a second plurality of satellites; evaluate the satellite measurement data to determine if the GPS corrections are degraded by a current ionosphere disturbance activity; determine a current quality metric of the ionosphere; adjust a Vertical Ionosphere Gradient standard deviation sigma-vig; evaluate the ephemeris data to determine if the GPS corrections provided to the vehicle are degraded by ephemeris errors; and establish ephemeris uncertainty to protect integrity based on the evaluation of the ephemeris data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.