Research On Guidance And Control System Of Low-speed Launched Guided-bomb

The paper put forward a design proposal and conduct a study on the key technology of guidance and control system of low-speed launched guided bomb.Make an assay of force and moment of the guided-bomb,establish dynamics model and kinematics model of the guided-bomb.Write out the relationships among the frame of axes.Process the aerodynamics parameters and shape parameters of the guided-bomb.Establish the pitching channel and roll channel model of the guided-bomb.Establish the atmosphere model and the sonic model.According to the complicate steering engine,make a simplification,come out with a qualified two-stage steering engine model and make a simulation.In consideration of the drawbacks of the uncorrected guided-bomb,make a research of the pitching channel based on the classical control theory and adaptive control theory,make a study of the roll channel based on the classical theory and sliding mode variable structure theory.At last,make a simulation and analyze the result.A guidance law based on constant trajectory inclination angle is applied in order to increase bomb flight range.The gravity PN guidance law,bias proportional navigation guidance law based on terminal impact angle constraint and sliding mode variable structure guidance law with terminal impact angular constraint are all derived,simulated and analyzed in the terminal guidance stage.To ensure smooth instruction variation between different guidance stages,a handing-off guidance law is also designed.The 6-degree-of-freedom flight simulation and analysis on guided-bomb is carried out for stationary target.In actual flight,the guided-bomb will maneuver in pitch,yaw and roll channel at the same time.Simulations show that the design methods accurately satisfies terminal position and impact angle constraint,which confirms the validity of design methods in this paper.