Design of Navigation and Control Law for Great Circle Flight Path

With increasing the application of the Unmanned Air Vehicles(UAV),the precision trajectory of UAV is critical.Two kinds of flight courses can be scheduled.One is straight line or curve on the local plane.The other is the great circle flight path on the earth surface.The great circle flight path studies little because of complex comparatively,so,in this paper,the dynamical model of an UAV is presented,the navigation algorithm of great circle flight path is derived in detail,and the law of control is designed.In addition,the effect of navigation under the gust disturbance is analyzed.The results of simulation show that the navigation precision is higher and the cross-distance deviation is smaller.The new algorithm and designed meets the need of actual great circle flight path.