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http://dx.doi.org/10.5139/JKSAS.2009.37.5.502

Fault Detection Method of Laser Inertial Navigation System Using FFT  

Yoo, Hae-Seong (국방과학연구소)
Kim, Cheon-Joong (국방과학연구소)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.37, no.5, 2009 , pp. 502-510 More about this Journal
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 0.1deg/sec. The lock-in region is generated by the imperfect mirrors in RLG. To avoid the lock-in region, sinusoidal motion which is called dither motion is applied on RLG. Therefore without the fault in LINS, the dither motion must be measured by RLG/accelerometer. In this paper, we propose the method to detect the fault of LINS through checking out whether or not the dither motion is always measured by RLG/accelerometer using the Fast Fourier Transformation(FFT) on the real time. The feasibility of the fault detection method proposed in this paper is verified through the stationary and van test.
Keywords
RLG; LINS; Dither Motion; Fault Detection;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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