Accelerometer calibration optimal design based on high-precision three-axis turntable

摘要

The calibration of inertial navigation system is a prerequisite for inertial navigation, calibration results have a direct impact on the quality of inertial navigation accuracy. It is a widely studied and applied technology with high technology maturation that calibrating inertia devices with high-precision rotary. The commonly used method is to estimate gyro parameters based on the rotational angular rate test, and estimating accelerometer parameters according to the multiple posited static test. There is a complete scheme of calibrating inertial navigation system now in the laboratory. However, in airborne gravity measurements, it demands smooth aircraft flight in practical application, while there are only accelerators in the direction to the sky that work. And the measured value of accelerators are oscillated in the vicinity of g as the aircraft swings in small angle. This paper studied the application conditions of the gravity meter, and optimized the design of the original calibration program form laboratory, then modeled and analysis the turntable error in simulation, and then completed the calibration of the accelerometer in [0.5g, g], which further improved the accuracy of accelerometer calibration, especially the accuracy of the scale factor.