In order to better adapt to the high dynamic, high maneuver and large acceleration characteristic of hypersonic vehicle, the integrated navigation system of gyroscope free strapdown inertia! navigation system (GFSINS), GPS and celestial navigation system(CNS) is proposed in this paper. For this program, a nine-accelerometer configuration scheme is designed firstly, and a angular velocity calculation approach combining with kalman filter is presented which can enhance the accuracy of angular velocity; Then a federated filtering structures based on two sub-filters including GFSINS/CNS and GFSINS/GPS is designed, and the global optimal estimation is obtained in the main fliter which improves the accuracy by utilizing a vector information assignment for federated filtering algorithm. Lastly , the simulation is carried out and the results show that adopting the GFSINS/GPS/CNS integrated navigation for hypersonic vehicle is available.
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