| A Study on Performance Improvement Method of Fixed-gain Self-alignment on Temperature Stabilizing State of Accelerometers |
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Inseop Lee |
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The 3rd Research and Development Institute, Agency for Defense Development |
| 가속도계 온도안정화 상태에서 고정이득방식 자체정렬의 성능개선 방법에 대한 연구 |
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이인섭 |
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국방과학연구소 제3기술연구본부 |
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| Abstract |
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For inertial navigation systems, initial information such as position, velocity and attitude is required for navigation. Self-alignment is the process to determine initial attitude on stationary condition using inertial measurements such as accelerations and angular rates. The accuracy of self-alignment is determined by inertial sensor error. As soon as an inertial navigation system is powered on, the temperature of accelerometer rises rapidly until temperature stabilization. It causes acceleration error which is called temperature stabilizing error of accelerometer. Therefore, temperature stabilizing error degrades the alignment accuracy and also increases alignment time. This paper suggests a method to calculate azimuthal attitude using curve fitting of horizontal control angular rate in fixed-gain self-alignment. It is verified by simulation and experiment that the accuracy is improved and the alignment time is reduced using the proposed method under existence of the temperature stabilizing error. |
| Key Words:
Self-alignment, Temperature Stabilizing Error, Inertial Navigation System, Curve Fitting |
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