Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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An Algorithmic Study on Free-gyro Positioning System( I ) - Measuring Nadir Angle by using the Motion Rate of a Spin Axis -

  • Jeong, Tae-Gweon (Division of Navigation System Engineering, Korea Maritime University) ;
  • Park, Sok-Chu (Division of Marine System Engineering, Korea Maritime University)
  • Published : 2007.12.31
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Abstract

The authors aim to establish the theory necessary for developing free gyro positioning system and focus on measuring the nadir angle by using the motion rate of a free gyro. The azimuth of a gyro vector from the North can be given by using the property of the free gyro. The motion rate of the spin axis in the gyro frame is transformed into the platform frame and again into the NED (north-east-down) navigation frame. The nadir angle of a gyro vector is obtained by using the North components of the motion rate of the spin axis in the NED frame. The component has to be transformed into the horizontal component of the gyro by using the azimuth of the gyro vector and then has to be integrated over the sampling interval.

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References

  1. Farrell, J. and Barth, M.(l999), 'The Global Positioning System and Inertial Navigation', Mcgraw-hill, pp. 44-50
  2. Jekeli, C.(2000), 'Inertial Navigation Systems with Geodetic Applications', Walter de Gruyter, p. 25
  3. Jeong, T. G.(2005), 'A Study on the Errors in the Free-Gyro Positioning System (I)', International Journal of Navigation and Port Research, Vol. 29, No.7, pp. 611-614 https://doi.org/10.5394/KINPR.2005.29.7.611
  4. Jeong, T. G. and Park, S. C.(2006), 'A Theoretical Study on Free Gyroscopic Compass', International Journal of Navigation and Port Research, Vol. 30, No.9, pp. 729-734 https://doi.org/10.5394/KINPR.2006.30.9.729
  5. Park, S. C. and Jeong, T. G.(2004), 'A Basic Study on Position Fixing by Free Gyros', Journal of Korean Navigation and Port Research, Vol. 28, No.8, pp. 653-657 https://doi.org/10.5394/KINPR.2004.28.8.653
  6. Rogers, R. M.(2003), 'Applied Mathematics in Integrated Navigation Systems', 2nd ed., AIAA, pp. 65-66
  7. Titterton, D. H. and Weston, J. L. (2004) , 'Strapdown Inertial Navigation Technology', AIAA, p. 287