重力/惯性匹配导航空间分辨率同步技术

Spatial Resolution Synchronization Technology of Gravity/Inertial Matching Navigation

重力/惯性匹配导航是一种使用地球重力场信息进行惯导位置匹配校正的组合导航方法。匹配导航中由于重力测量信息与重力数据库信息空间分辨率不同步会造成空间分辨率不同步误差。为抑制匹配导航中出现的空间不同步误差,提出一种空间分辨率同步技术。该技术通过载体运动信息与重力测量算法滤波模型参数计算重力测量信息空间分辨率,并通过二维滤波降低重力数据库分辨率,使重力测量信息与重力数据库信息实现分辨率同步。在对数据库进行空间分辨率修正后,再使用匹配导航算法进行匹配定位。在仿真验证中改进后的匹配导航算法定位精度较传统匹配算法定位精度提高了1.1 nmile。通过空间分辨率同步技术可以提升匹配导航定位精度,为未来重力匹配导航设备发展提供辅助。

Gravity/inertial matching navigation is an integrated navigation method which uses the earth gravity field information to correct the inertial position matching.In matching navigation,the spatial resolution error is caused by the spatial resolution difference between gravity measurement information and gravity database information.In this paper,a spatial resolution synchronization technique is proposed to reduce the spatial unsynchronization error in matching navigation.The spatial resolution synchronization technique calculates the spatial resolution of the gravity measurement information through the carrier motion information and the parameters of the gravity measurement algorithm filtering model,and reduces the resolution of the gravity database through the two-dimensional filtering.The information of gravity measurement is synchronized with the information of gravity database.After the spatial resolution of the database is modified,the matching navigation algorithm is used for matching location.The location accuracy of the improved matching navigation algorithm is 1.1 nmile higher than that of the traditional matching algorithm.The spatial resolution synchronization technology can improve the positioning accuracy of gravity-matched navigation,which will be helpful for the development of gravity-matched navigation equipment in the future.