Patent ID: 8310395
Filing Date: 2012-11-13
Classification: G01S

Abstract:
1. A method of amending navigation data of a global navigation system comprising a plurality of space vehicles that transmit information to at least one device for position detection; wherein: each space vehicle has at least one clock; and the impact of space vehicle navigation data anomalies, including clock frequency jumps, on the at least one device for position detection is reduced by a ground mission segment performing the steps of 1a) receiving navigation signals from a space vehicle; 1b) estimating a prediction of a clock phase offset of a clock signal sent from the space vehicle, and storing this prediction in a memory; 1c) computing at a current measurement and monitoring epoch (t 1d) obtaining an earlier computed phase offset difference (d 1e) deriving a difference (Δ 1f) comparing the difference (Δ 1g) generating an integrity risk signal if the difference (Δ 1h) transmitting the integrity risk signal to the at least one device for position detection of the global navigation system.