摘要
垂线偏差数据对于提高惯性导航精度具有重要意义,阐述了使用重力场球谐模型计算水平重力扰动的方法,使用EGM2008重力场球谐模型计算水平重力扰动,并将其与美国国家地理空间情报局提供的全球2.5′×2.5′垂线偏差网格数据进行对比,验证了所述水平重力扰动计算方法的正确性。将水平重力扰动计算结果用于航空、车载惯性导航数据离线处理,结果表明EGM2008模型计算的水平重力扰动可用于补偿惯性导航;将水平重力扰动计算结果用于长航时船载惯性导航数据离线处理,结果表明惯性导航精度最大提升1.5 n mile,平均提升0.8 n mile。
Vertical deflection can be used to improve the performance of inertial navigation system. The calculation method of vertical deflection based on harmonic model is described. EGM2008 is used to calculate vertical deflection. Comparison between the calculation result and 2.5′×2.5′DOV grid data from NGA verifies the validity of the described calculation method. Through the airborne and terrestrial strapdown inertial navigation calculation, it is shown that the gravity disturbance from EGM2008 can be used to improve the position accuracy of inertial navigation system, and the maximum and average location accuracies of inertial navigation system are increased by 1.5 n mile and 0.8 n mile, respectively, in the long- time shipborne test.
作者
铁俊波
吴美平
蔡劭琨
张开东
练军想
TIE Jun-bo1, WU Mei-ping1, CAI Shao-kunl, ZHANG Kai-dongl, LIAN Jun-xiangl(College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, Chin)
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2017年第5期624-629,共6页
Journal of Chinese Inertial Technology
基金
国家自然科学基金项目(61603401)
国土资源部航空地球物理与遥感地质重点实验室青年创新基金课题(2016YFL06)
关键词
惯性导航
重力扰动
重力场球谐模型
垂线偏差补偿
inertial navigation
gravity disturbance
gravity harmonics model
compensation for vertical deflection