Trajectory And Guidance Techniques Research Of Space-based Anti Near-space Target

With the ongoing of researching on near-space vehicle, the interrelated techniques research of space-based anti near-space target is strategically meaningful. This dissertation focuses the method of space-based platform anti near-space target. The content is as follows:The counter model of space-based anti near-space target is studied. Taking the stratospheric airship as an example, the characteristic of near-space target is studied. Firstly, the flight and structure characteristic is analyzed, and the military value of low-velocity near-space vehicle is discussed; secondly, two operation mode of space-based platform anti near-space target are formed, and with the analysis on the characteristic of the two modes, the battle scenario is brought forward.The trajectory planning of sub-vehicle striking near-space target is studied. With the beginning of solving bank angle’s optimal control problem, the sub-vehicle’s reentry dynamic equations are formed, the near-optimal control law is derived with the application of quasi-equilibrium glide condition, and the inequality constraints is transformed into the bank angle-velocity profile; the trajectory optimal problem is then transformed into a univariate root-finding problem, and the footprint problem is equivalent to seeking the solutions of a serious of the closest approach to a moving virtual target; the validity of the method is verified with MATLAB simulation.The accurate guidance law of the missile after separation from the sub-vehicle is designed. The dynamic model of guided phase is formed, and the analysis establishes that the change of guidance parameters of proportional navigation has effects to the line-of-sight angle and its rate, based on which a strategy of adaptive updating guidance parameters is designed; the parameters adaptive updating guidance flow is presented, and MATLAB simulation results are used to contrast the two conditions with and without the error interference, the validity and robustness of the adaptive proportion guidance law is verified.