Analysis On Intersection Conditions Of Interruptting A Hypersonic Vehicle

Nearspace hypersonic target with high speed and high maneuvering ability is very difficult to be detected and intercepted.Due to the influence of the side window detection,the intersection conditions should meet the constraints of the overload range of the interceptor under the condition of asymmetric field of view.Meanwhile,the influences of the random error of the target maneuvering and the detection error of the seeker are different under different intersection conditions.Therefore,considering the random error,it is necessary to analyze the intersection conditions of interception.In this thesis,the background of this thesis is the interception of the nearspace hypersonic target,and an analysis and design problem of the intersection conditions are considered.First,the coordinate systems and their relations is given,and the relative motion model is established in the inertial line of sight coordinate system.The mathematical description of the side window constraint is given,which provides foundation for the later modeling and analysis.Secondly,the interceptor reachability region under the asymmetric field of view is calculated.The new roll angle and angle of attack are defined.A new angle constraint equation is deduced,based on which,the analysis model is established and the relationship between the intercepting ability,the angle of rotation and the angle of attack are analyzed.Then the interceptor overload interval constraint is obtained that is available for intersection between the flight vehicle and target.Furthermore,based on the relative motion model and the available overload interval at the beginning of the intersection,the method of calculation the reachable area of the interceptor is proposed at a certain time.Thirdly,considering the difficulty braught from the nonlinearity and randomness of the model,the analysis of the intersection angle constraint based on the decision tree is carried out.The relative motion model of introducing the intersection angle is established.Fourthly,a decision tree-based anaysis method is proposed to extract the intersection condition rules from the model.The analysis results are analyzed mainly considering the intersection angle constraint.The influences of the cutoff angle and the velocity ratio of the intersection angle on the intercept process are analyzed.The changing rule of the flight vehicle with different intersection conditions is verified.The correctness of the analysis result is verified by simulations.Finally,a complete multi-constraint intersection conditions is designed.Several basic ways of intersection are given and the feasibility of them is analyzed respectively.Based on the analysis of the demand of the intersection,the feasible solution of the lateral intersection condisions design and the vertical intersection conditions design are deduced for design.The effectness of the result is analyzed by simulation at last.