Patent ID: 7869949
Filing Date: 2011-01-11
Classification: G01S

Abstract:
1. A vehicle system in a vehicle, comprising: a position determination module for determining position data of the vehicle using satellite signals received by an earth-based receiver system and an estimated value for error of said satellite signals; and an integrity module for determining an integrity risk for the position data, said integrity risk being derived using time determinations performed by a satellite navigation system; and a warning module for generating a warning signal to prevent, via modules connected to the vehicle system, use of the position data for the vehicle, if a threshold value for the integrity risk for the position data is exceeded; wherein said integrity risk is determined using the estimated value for error in the received satellite signals; for determining position data of the vehicle, said position determination module uses, from among said satellite signals, only satellite signals which, as a whole, have not been transmitted by the earth-based receiver system to the vehicle system as being erroneous; the estimated value for error of said satellite signals is set to be equal to said threshold value; and accuracy of the estimated value for error of said satellite signals is set to be equal to a deviation accuracy transmitted from the receiver system to the vehicle system.