Research On Landing Point Calculation And Prediction Of Unpowered Airdrop

Unpowered airdrop on ocean has important value in military and civil research.In this paper,the problem of unpowered precise airdrop in random disturbance environment is studied.The research content of this paper is divided into three parts,focusing on the three requirements of the accuracy,rapidity and safety reliability of the calculation method of unpowered airdrop.Firstly,in order to improve the accuracy of air dropping,this paper carries out research from the following three aspects: the establishment of mathematical model of air dropping,the analysis of precision influencing factors,and random interference compensation.The precise modeling of the three main factors of airdrop(airdrop model,external environment model and target model)is carried out.The key factors affecting the accuracy of airdrop are found out from various factors by using factor analysis method.The compensation calculation method for various random interference errors is designed around various key factors.The method is proved by digital flight simulation through typical examples.The precision of air dropping meets the technical requirements.Secondly,in order to solve the technical contradiction between the rapidity and accuracy of the algorithm comprehensively,this paper applies the intelligent fitting algorithm to the calculation of landing points with large amount of data and wide range of conditions.By using PSO-BP neural network,the formula for calculating the falling point is obtained.The simulation results show that this method not only guarantees the calculation accuracy,but also improves the speed of the algorithm and ensures the real-time online performance of the algorithm.Finally,aiming at the terminal state constraints of airplane launch status,this paper completes flight trajectory planning for airplane through Dubins curve planning method,which satisfies the accuracy error allowance,ensures the high precision and low landing speed of airdrop,and meets the requirements of Engineering application,and Vega Prime is used to design a three-dimensional visual simulation software to animate the airdrop scheme.