基于EGM2008重力场球谐模型的水平重力扰动计算方法

发布时间：2018-10-26 13:12

【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。
[Abstract]:The perpendicular deviation data is of great significance for improving the accuracy of inertial navigation. This paper expounds the method of calculating horizontal gravity disturbance by using the spherical harmonic model of gravity field and the horizontal gravity disturbance by using the spherical harmonic model of EGM2008 gravity field. Compared with the global 2.5'脳 2.5 'vertical deviation grid data provided by the National Geospatial Intelligence Agency of the United States, the proposed method is proved to be correct. The calculation results of horizontal gravity disturbance are used in aeronautical and vehicle-borne inertial navigation data off-line processing. The results show that the horizontal gravity disturbance calculated by EGM2008 model can be used to compensate inertial navigation. The calculation results of horizontal gravity disturbance are applied to the off-line processing of ship inertial navigation data during long voyage. The results show that the maximum accuracy of inertial navigation is 1. 5 n mile, and the average lift is 0. 8 n mile..
【作者单位】：国防科技大学机电工程与自动化学院;
【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)
【分类号】：TN96

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