METHOD OF IMPROVING SATELLITE REACQUISITION PERFORMANCE FOR INTEGRATED GP/1G NAVIGATIONAL SYSTEMS

摘要

A method of reacquiring a satellite signal within an integrated GP/IG navigation system (100) comprising s a GPS unit (102) and an IG unit (104). The system detects a loss of synchronization between satellite signal timing code and a reference timing code, whrein position data is received from the IG unit (104) and representative of an estimated position of the navigation system (100). The system includes a DSP unit (112), which estimates a distance from the navigation system (100) to the satellite (106), as a function of the position data, and derives an initial delay from the distance. The DSP (112 delays the reference timing code, with respect to a satellite signal timing code, by an offset delay until the satellite timing code is synchronized with the reference timing code.