Research On Chaff Cloud Motion Modeling And Echo Signal Simulation Technolog

Chaff jamming is a common jamming mode of air-to-air missiles,and chaff with a certain density or quantity can make air-to-air missile radio fuze explode early or refuse to explode.Fixed-wing aircraft and armed helicopters are the main targets of air-to-air missiles.After the spread of chaff bomb,the wake of fixed-wing aircraft and the wake of helicopter rotor have a great influence on the diffusion process of chaff.Therefore,it is of great significance to study the dynamic characteristics and scattering characteristics of chaff cloud under the action of wake to improve the ability of radio fuze to resist chaff jamming.Based on the anti-chaff jamming technology of radio fuze,this paper focuses on the simulation technology of rotor free wake,the modeling and visual simulation technology of chaff cloud motion under the action of rotor wake,and the simulation technology of chaff cloud echo of radio fuze.The main work of this thesis is as follows:Based on the pseudo-implicit prediction-correction algorithm,the rotor free wake model is established,and the simulation calculation of rotor wake and rotor induced velocity field is realized.Based on the aerodynamic theory and particle system theory,a chaff cloud motion model under the action of helicopter rotor wake is established by combining with the rotor free wake model,and the description of chaff cloud motion process under different densities and different scattering modes is realized.A pulse Doppler radio fuze detection model based on conformal circular array antenna is established.Based on the chaff cloud motion model and radio fuze detection model,the simulation calculation of chaff cloud echo signal when the fuze partially irradiates the chaff cloud under the action of helicopter rotor wake is realized.Based on the C++Builder integrated development environment,the chaff cloud visual simulation and radio fuze echo simulation software under the action of wake is developed.The visual simulation of chaff cloud diffusion process and the simulation calculation of chaff cloud echo signal under different throwing modes and different target conditions are realized.