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http://dx.doi.org/10.12673/jant.2020.24.5.374

Real-time Calculation of Geoid Applicable to Embedded Systems  

Kim, Hyun-seok (Agency for Defense Development)
Park, Chan-sik (Department of Control and Robotics Engineering, Chungbuk Natioinal University)
Publication Information
Journal of Advanced Navigation Technology / v.24, no.5, 2020 , pp. 374-381 More about this Journal
Abstract
In order to improve the vertical position accuracy, the advantages of GPS and barometric altimeter are combined and used, but in order to fuse the two sensors, the geoid altitude must be compensated. In this paper, we proposed a technique that can calculate geoid altitude in real time even in low-cost embedded systems applied to drones or autonomous vehicles. Since the reference EGM08 is determined by a polynomial of the 2160th order, real-time calculation is impossible in the embedded system. Therefore, by introducing a linear interpolation technique, the amount of calculation was increased, and the storage space was saved by 75% by using the integer geoid height as a grid point. The accuracy of the proposed technique was evaluated through simulation, and it was confirmed that the accuracy of the maximum error is -1.215 m even in the region where the geoid change is rapid.
Keywords
Real-time geoid calculation; Bi-linear interpolation; Inverse distance weighted interpolation; EGM2008; Embedded system;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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1 D. H. Kim, B. R. Yun, S. H. Lee and W. J. Lee, "Improvement of altitude measurement algorithm based on accelerometer for holding drone's altitude," KIPS Transactions on Software and Data Engineering, Vol. 6, No. 10, pp. 473-478, Oct. 2017.   DOI
2 L. W. Kim, K. H. Choi, J. H. Lim, W. J. Yoo and H. K. Lee, "Improving GPS vertical error using barometric altimeter," Journal of Advanced Navigation Technology, Vol. 20, No. 1, pp. 29-36, Feb. 2016.   DOI
3 M. S. Han, "Improvement of filtering method of digital pressure sensor for drone altitude measurement," The Journal of Korean Institute of Intelligent Systems, Vol. 27, No. 6, pp. 537-542, 12. 2017.   DOI
4 H. Yoo, S. B. Chun, C. B. Kwon, Y. J. Lee, G. I. Jee, H. S. Jun and J. M. Joo, "Altitude estimation improvement in DGPS using barometric altitude sensors," Journal of The Korean Society for Aeronoutical & Sciences, Vol. 34, No. 1, pp. 89-94, Jan. 2006.
5 N. H. Kim, C. H. Park, "A barometric altitude sensor and GPS altitude system fusion by using kalman filter," in Proceeding of the 36th Institute of Electronics Engineers of Korea(IEEK), Jeju: Korea, pp. 549-551, Jul. 2013.
6 National geospatioal-intelligence agency software and coefficients for WGS 84 geoid undulation computations by harmonic yynthesis. Available: https://earth-info.nga.mi l/GandG/wgs84/gravitymod/egm2008/egm08_wgs84.html.
7 W. Luo, M. C. Taylor and S. R. Parker, "A comparison of spatial interpolation methods to estimate continuous wind speed surfaces using irregularly distributed data from England and Wales," International Journal of Climatology, Vol. 28, pp. 947-959, 2008.   DOI
8 I. Ashraf, S. J. Hur and Y. W. Park, "An investigation of interpolation techniques to generate 2D intensity image from LIDAR data," IEEE Access, Vol. 5, pp. 8250-8260, 4. 2017.   DOI
9 J. M. Ahn and I. H. Park, "An assessment on the hydraulic characteristics of a multi-dimensional model in response to measurement resolution and spatial interpolation methods," The Journal of Korean Institute of Intelligent Systems, Vol. 2, No. 1, pp. 43-51, 3. 2012