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Design of a Compact GPS/MEMS IMU Integrated Navigation Receiver Module for High Dynamic Environment

고기동 환경에 적용 가능한 소형 GPS/MEMS IMU 통합항법 수신모듈 설계

  • 정구용 (단암시스템즈 기술연구소) ;
  • 박대영 (단암시스템즈 기술연구소) ;
  • 김성민 (단암시스템즈 기술연구소) ;
  • 이종혁 (단암시스템즈 기술연구소)
  • Received : 2021.01.12
  • Accepted : 2021.02.18
  • Published : 2021.02.28

Abstract

In this paper, a GPS/MEMS IMU integrated navigation receiver module capable of operating in a high dynamic environment is designed and fabricated, and the results is confirmed. The designed module is composed of RF receiver unit, inertial measurement unit, signal processing unit, correlator, and navigation S/W. The RF receiver performs the functions of low noise amplification, frequency conversion, filtering, and automatic gain control. The inertial measurement unit collects measurement data from a MEMS class IMU applied with a 3-axis gyroscope, accelerometer, and geomagnetic sensor. In addition, it provides an interface to transmit to the navigation S/W. The signal processing unit and the correlator is implemented with FPGA logic to perform filtering and corrrelation value calculation. Navigation S/W is implemented using the internal CPU of the FPGA. The size of the manufactured module is 95.0×85.0×.12.5mm, the weight is 110g, and the navigation accuracy performance within the specification is confirmed in an environment of 1200m/s and acceleration of 10g.

본 논문에서는 높은 동특성 환경에서 동작이 가능한 GPS/MEMS IMU 통합항법 수신모듈을 설계 및 제작하고, 그 결과를 확인하였다. 설계한 모듈은 RF 수신부, 관성측정부, 신호처리부, 상관기, 항법 S/W로 구성된다. RF 수신부는 저잡음증폭, 주파수 변환, 필터링, 자동이득조절 기능을 수행하고, 관성측정부는 3축 자이로스코프, 가속도계, 지자기센서가 적용된 MEMS급 IMU로부터 측정 데이터를 수집하여 항법S/W로 전달하는 인터페이스를 제공한다. 신호처리부 및 상관기는 FPGA 로직으로 구현하여 필터링 및 상관 값 계산을 수행하고, FPGA 내부 CPU를 사용하여 위성항법, 통합항법 S/W를 구현하였다. 제작된 모듈의 크기는 95.0 × 85.0 × 12.5 mm 이고, 무게는 110g을 확인하였으며, 동적성능 1200m/s, 가속도 10g의 환경에서 규격 이내의 항법정확도 성능을 확인하였다.

Keywords

References

  1. D. H. Titterton and J. L. Weston, Strapdown inertial navigation technology, 2nd ed. United Kingdom, UK: The Institution of Electrical Engineers, 2004.
  2. P. Aggarwal, Z. Syed, A. Noureldin, N. El-Sheimy, MEMS-based Integrated Navigation, Boston, MA, USA: Artech House, 2010.
  3. H. S. Kim, S. J. Baek, and Y. C. Cho, "Improving INS/GPS integrated system position error using dilution of precision," Journal of Advanced Navigation Technology, Vol 21, No. 1, pp. 138-144, Feb. 2017. https://doi.org/10.12673/jant.2017.21.1.138
  4. S. J. Baek, "A design of the IMM filter for improving position error of the INS/GPS integrated system," Journal of Advanced Navigation Technology, Vol. 23, No. 3, pp. 221-227, Jun. 2019.
  5. J. D. Park, M. W. Kim, H. S. Kim, J. Y. Lee and H. K. Lee, "Lever arm error compensation of GPS/INS integrated navigation by velocity measurements," Journal of the Korean Society for Aeronautical and Space Sciences, Vol. 41, No. 6, pp.481-487, May. 2013. https://doi.org/10.5139/JKSAS.2013.41.6.481