System and method for monitoring integrity of a global navigation satellite system

摘要

A system and method for monitoring integrity of a Global Navigation Satellite System (GNSS) are provided. Integrity of a GNSS location is assessed based on a comparison of the GNSS location with one or more locations received from at least one other GNSS. Integrity of the GNSS location is also assessed based on a comparison of the GNSS location with one or more locations obtained from signals generated by one or more known located emitters. Integrity of the GNSS location is also assessed based on a comparison of the GNSS location with historical data, which may include contextual information of recent GNSS locations of a user equipment, measurements made by an inertial navigation system of the user equipment, and prior measurements made by the user equipment during similar paths. An integrity warning is outputted when one or more of the integrity assessments indicate a loss of integrity of GNSS.

主权项

1. A navigation user equipment system for providing highly available integrity monitoring of a GNSS, the system comprising:
a navigation user equipment, wherein the navigation user equipment is configured to assess integrity of a GNSS location obtained from the GNSS against one or more locations obtained from at least one other GNSS, and wherein the navigation user equipment is further configured to assess integrity of the GNSS location against locations obtained from signals generated by one or more known local fixed emitters, and wherein the navigation user equipment is further configured to assess integrity of the GNSS location based on historical data, wherein the historical data comprise at least one of measurements made by an inertial navigation system of a user equipment or prior measurements made by the user equipment during similar paths, and wherein the navigation user equipment is further configured to output an integrity warning when one or more of the integrity assessments indicate a loss of integrity of the GNSS; a first communication interface configured to receive fixed emitter information and the historical data from a centralized database, wherein the first communication interface is further configured to load the received fixed emitter information and historical data into the user equipment prior to transiting a path; and a second communication interface configured to receive navigational data of the user equipment, wherein the second communication interface is further configured to load the navigational data of the user equipment after transiting a path into the centralized database to update the historical data.