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Journal of the Korea Institute of Military Science and Technology 2009;12(5):622-635.
Performance Analysis on the Initial Alignment of Laser Inertial Navigation System
Hyun-Seok Kim, Cheon-Joong Kim, Tae-Gyoo Lee
레이저 관성항법장치 초기정렬 성능 분석
김현석, 김천중, 이태규
국방과학연구소
Abstract
Laser Inertial Navigation System(LINS) consists of Ring Laser Gyroscopes(RLG) and accelerometers. RLG has a lock-in region in which there is zero output for input angular rates less than about 0.1deg/sec. The lock-in region is generated by the imperfect mirrors in RLG. To avoid the lock-in region, a sinusoidal motion called dither motion is applied on RLG. Therefore this dither motion is measured by RLG/accelerometer even if at a stop state. In this situation, the performance on the initial alignment of LINS can be degraded. In this paper, we analyze the performance on the initial alignment of LINS theoretically and experimentally. Analysis results include how dither motion, the pre-filter and the corner frequency in alignment loop affects the performance on the initial alignment of LINS.
Key Words: Initial Alignment, Laser Inertial Navigation System, Dither Motion, Sinusoidal Measurement


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