Research On Trajectory Optimization & Guidance Of Hypersonic Vehicle's Boost Stage

Based on the background and requirements,following the development of hypersonic vehicles,this dissertation studies the vehicles research,trajectory optimization & guidance algorithms of boost-phase.For the hypersonic vehicles characteristics,the dissertation does a survey of the air-breathing hypersonic cruise vehicles & boost-glide hypersonic vehicles of US army particularly,then summaries and analyses the trajectory optimization & guidance technology.The hypersonic vehicle concludes boost,climb,cruise & dive phases,the boost phase is the first phase,at the end of boost phase,the vehicle need to match the boost-climb switch window,so we particularly do a research on it.By ignoring the earth rotating and non-spherical,a kinetics model in position reference frame is built.Then a trajectory optimization of boost phase is proposed.SQP is a well recognized method for trajectory optimization,but it 's sensitive to initial value while has a poor fitness to complicated issue.So an initial value guess method based on orthogonal experimental design is proposed,it can give a reliable initial value for SQP.In actual flight,vehicles must consider the constraints such as overload,dynamic pressure,controlling etc,combined all the constraints we simulate to validate the orthogonal experimental & SQP method's adaptability.While the way mentioned is some complicated for trajectory optimization,and not friendly for engineering application,So a artificial memory-based optimization is given to optimize the boost-phase's trajectory.To solve complicated optimization problems,the artificial memory-based optimization(AMO)with global convergence is constructed based on memory principles.AMO is proved to be a promising way to trajectory optimization.In the boost phase,there are full of interferences which have very strong influence,this requires a high qualified guidance.To find a pragmatic guidance method for hypersonic vehicle's boost phase,an guidance methods investment is given about popular research in recent years,but barely is suitable.In the article,a guidance law based on feedback linearization is studied,it belongs to standard trajectory guidance,and can follow the trajectory well,the simulation shows it 's credible and applicable.