Patent ID: 6640189
Filing Date: 2003-10-28
Classification: G01C,G01S

Abstract:
A method of reacquiring a satellite signal within an integrated GP/IG navigation system, comprising:detecting a loss of synchronization between a timing code embedded in the satellite signal and a corresponding reference timing code; receiving position data from an inertial guidance unit, the position data being representative of an estimated position of the GP/IG navigation system; estimating a distance value, corresponding to the distance from the GP/IG navigation system to the satellite, as a function of the position data, and deriving an initial delay value from the distance value; and delaying the reference timing code, with respect to the timing code embedded in the satellite signal, by an offset delay value substantially equal to the initial delay value, including incrementally varying the offset delay value (i) until the timing code embedded in the satellite signal is synchronized with the reference timing code, or (ii) until the offset delay value equals a predetermined end limit value.