Patent ID: 9182495
Filing Date: 2015-11-10
Classification: G01S

Abstract:
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.