Analysis and Compensation on Static Error of Accelerometer in GFSINS

In the gyro free strapdown inertial navigation system (GFSINS), the precision of system is obviously affected by the static error of accelerometer because accelerometers are used instead of gyroscopes. Firstly, the static error model of accelerometer is built, and the effect of static error for angular velocity calculation in a nine-accelerometer configuration system is given. Then, the accelerometer is tested by single-axis equal position rolling method, and the static error is calibrated by using linear neural network which has simple network structure, rapid convergence speed and no part minimum value. Finally, the dynamic error of accelerometer for GFSINS is compensated. Simulation results show that the calibration error of static coefficients of accelerometer is less than 5% by the new method, and the calculation precision of angular velocity is effectively improved after error compensation.