水平重力异常对惯性定位定向系统定位精度影响分析

Analysis of the Influence of Horizontal Gravity Anomaly on the Positioning Accuracy of Inertial Positioning and Orientation System

对于高精度定位定向系统而言,其零速修正定位精度受到行驶路线中水平重力异常变化的影响。从惯性导航误差机理、零速修正原理等方面理论分析水平重力异常对定位定向系统定位误差的影响,得到其误差传递公式。为验证误差传递公式的准确性,在重力异常试验区内进行了实物验证,验证了水平重力异常对定位定向系统定位精度的影响机理,通过重力异常补偿实现了在重力异常区域水平定位误差小于1m。为今后进一步提升定位定向系统定位精度提出了新思路。

For the high-precision positioning and orientation system,its zero-speed correction positioning accuracy is affected by the abnormal change of horizontal gravity in the driving route.The influence of horizontal gravity anomaly on the positioning error of positioning and orientation system is analyzed theoretically from the aspects of inertial navigation error mechanism and zero speed correction principle,and its error transfer formula is obtained.In order to verify the accuracy of the error transfer formula,the physical verification was carried out in the gravity anomaly test area,and the influence mechanism of horizontal gravity anomaly on the positioning accuracy of the positioning and orientation system was verified.Through gravity anomaly compensation,the horizontal positioning error in the gravity anomaly area was less than 1 m.It puts forward a new idea for further improving the positioning accuracy of the positioning and orientation system in the future.