Based On A Digital Map Of The Unmanned Fighter Aircraft At Low Altitude Penetration Trajectory Planning Method

It is the key to enhance UCAV's survival probability when it is taking in low altitude penetration mission.It is important for enhancing UCAV'suvival probality to plan an optimal route before flight or in flight. This paper has spreaded its content around this point.At first, this paper presents two-demensional quartic convolution interpolation to smooth digital terrain.It is acquired from that it makes use of that the interpolation function of cubic spline interpolation has a continuous third derivative on the base of two-dementional cubic convolution interpolation.two-demensional quartic convolution interpolation is more precise than two-dementional cubic convolution and simpler than cubic spline interpolation in calculation.It can satisfy real-time route planning of UCAV.Secondly, That how to deal with the threats information in planning route is an difficulty.The traditional methods that the threats information is deemed as terrain like cylinder or conic are not concerned about the primitive terrain. So the conception of LOS(Light Of Sign) is introduced into the equivalent treatment of treat avoidance in order to take account of terrain-shiled affection.Finally,A new genetic algorithm is developed in this paper.Three new arithmetic operators which are introduced into the algorithm are Recording Better, Restoration and Reconstruction.What's more,The known arithmetic operators are also improved in order to expand searching scope. This algorithm has two advantages:1) high converging speed;2) globally-optimal selection.When it is applied to the route planning of UCAV's low altitude penetration mission,most optimal route is acquired but fewer generations have multiplied.