Ballistic Missile Disturbance The Gravitational Fast Approximation Algorithm Research

Revolving around the fast computation of the disturbing gravity of ballisticmissile trajectory this dissertation mainly focuses on the following problems: firstly,analysis and comparison of the existing computing methods of the disturbing gravityare made, according to which the method of point mass model is considered strict andexact and thus is selected as the foundation of subsequent research; secondly, after afull review of the numerical interpolation methods in conunon use, because of itsexcellent property' the cubic isometrical B-spline is chosen to interpolate thedisturbing gravity along some pre-designed trajectory and considered fit fOr the fastcomputation of disturbing gravity along a IIilssile trajectory after the analysis ofresult; thirdly, a finite element interpo1ation method is put forward in this paper, withemphasis laid on the partition of spatial elements and the selection of shaPe functionof element, and consequent result shows that this method is also fit fOr the fastcomPutation of disturbing gravity of IIilssile trajectory; finally, the above methods areintegrated into software so as to be convenient and successive and automatic fOrfurther use.