Study Of Reentry Guidance Technology For Class-HGB Aircraft

Hypersonic reentry aircraft generally refers to the reentry aircraft whose speed is5times higher than that of the sound. Due to its advantages of high precision and highspeed, the hypersonic aircraft is widely favored. At the beginning of this century, inorder to maintain and consolidate its position as the world first military power, theUnited States proposed "global prompt strike" concept and accelerated the research inthe field of hypersonic technology, in order to obtain the new breakthrough. Reentryguidance is one of the key technologies in the development of the hypersonic aircraft,thus it has a great significance.This paper carries out the research on the reentry guidance technology for thehypersonic vehicle based on an863project; the research object selected is theclass-HGB aircraft, which is the scale model of the hypersonic glide HGB of the AHWprojects successfully implemented in the United States,2011.Firstly, the related development status and key technologies of the hypersonicvehicles are researched; besides, the research status of the reentry guidance technologyis reviewed. Then the dimensionless reentry kinetic model is established, which lays thefoundation for the further research. Secondly, the attack angle profile is selected basedon the previous work, the reentry corridor based on the H-V profile is designed with thecombination of the reentry process and terminal constraints, and on this basis, the sizeof the boundary size of the only control amount, e.g. roll angle, is calculated. Then,the research on the reentry guidance of the class-HGB aircraft is conducted with themethods of the standard track and numerical prediction-correction, providing thecorresponding guidance law. Finally these two guidance laws are simulated andvalidated respectively with the same simulation examples. The results indicate that: theby comparing the guidance precision racking method: both the LQR tracing methodbased standard trajectory guidance law and numerical predictor-corrector reentryguidance law have high guidance precision, besides, the predictor-corrector reentryguidance law can relieve the drop of the motor ability induced by relatively small liftdrag ratio of the class-HGB aircraft, thus it can be regarded having strong adaptabilityand robustness.