Abstract The estimation method and accuracy of gravity disturbance in local horizontal coordinate system and inertial coordinate system are compared for the strapdown GNSS/INS combined airborne gravity measurement system. The results show that the accuracy of the Kalman filter method based on the acceleration update in the inertial coordinate system is equivalent to the Kalman filter method based on the position and velocity update in the local horizontal coordinate system. However, the former algorithm is simpler. By using the two methods, the mean standard deviation of the gravity disturbance difference of the six repeatlines are 1.21 mGal and 1.27 mGal respectively, with half-wavelength resolution of 7.5 km. For the same lines, the standard deviation of the gravity disturbance difference calculated by the two methods is 0.65 mGal. The gravity disturbance of the repeatlines obtained by the two methods have evident systematic error, which can be obviously reduced by linear compensation according to time. The maximum difference between the lines is reduced from 8.20 mGal, 8.19 mGal to 2.70 mGal, 2.54 mGal respectively, and the mean internal accuracy is increased from 1.21 mGal, 1.27 mGal to 1.06 mGal, 1.10 mGal respectively.
GUO Dong,SUN Zhongmiao,WU Fumei et al. Comparison and Analysis of Airborne Gravity Disturbance in Different Coordinate Systems[J]. jgg, 2018, 38(10): 1068-1072.
GUO Dong,SUN Zhongmiao,WU Fumei et al. Comparison and Analysis of Airborne Gravity Disturbance in Different Coordinate Systems[J]. jgg, 2018, 38(10): 1068-1072.