Research on inertial information aided GPS tracking loop in high dynamic environment

GPS signal will generate the doppler frequency offset and its higher derivative when the precision guided weapon, such as missile rocket and so on, are in flight. The common tracking loop cannot track the signal steady, so that the receiver is likely to lose lock the signal and even to lose the ability of positioning and navigation. In order to track the signal steady in high dynamic environment, a method of the inertial information aided GPS tracking loop is given. The method provides the dopplor frequency offset aid for the tracking loop with the predicted frequency. The experiment results show that the method can meet the dynamic requirement of 50g missile acceleration with respect to the satellite and overcome the dynamical stress effect markedly. GPS receiver has the better ability of tracking dynamically.