In order to improve measurement precision of three-axis accelerometer

establish error model based on its error source and producing mechanism; through analysis on error model

point out that output trajectory of threeaxis accelerometer accords with ellipsoid hypothesis

an ellipsoid fitting method is put forward to determine error model and realize accelerometer error compensation. Three-axis accelerometer is strapdown installed to three-DoF turntable for error calibration and compensation

and experimental results show that the maximum and minimum absolute error of accelerometer can be reduced about 100 times and the accelerometer precision can reach 10- 3m / s2. The method is simple and feasible because of its low attitude requirements for gathering data

in addition

the compensation effect is remarkable.