Normal gravity model for inertial navigation of a hypersonic boost-glide vehicle  

作　　者：Kai CHEN Cheng-zhi ZENG Sen-sen PEI Wen-chao LIANG 

机构地区：[1]School of Astronautics,Northwestern Polytechnical University,Xi’an,710072,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2022年第1期55-67,共13页浙江大学学报（英文版）A辑（应用物理与工程）

摘　　要：The normal gravity model of a hypersonic boost-glide vehicle in near space is studied in this paper with the aim of alleviating the influence of the gravity model error on the precision of the inertial navigation system(INS)during flight.First,a spherical harmonic model of the Earth’s gravitational field is introduced and the normal gravity of the Earth is derived from it.Then,the coordinate transformation needed for the application of the gravity model to the near-space navigation algorithm is formulated.Subsequently,the gravity disturbance in near space and the impact of J_(2)and J_(4)gravity truncation errors are analyzed.Finally,different normal gravity models and different precisions of inertial measurement unit(IMU)are exploited to simulate the near-space navigation algorithm.Based on this,the influence of the independent and combined effects caused by the interference factors is analyzed,and the applicable conditions of the normal gravity model are discussed.

关 键 词：Hypersonic boost-glide vehicle Inertial navigation system(INS) Normal gravity Gravity disturbance 

分 类 号：V249.3[航空宇航科学与技术—飞行器设计] V448