A GNSS Signal Correlation Using Map-based Partial-time Common Intermediate Frequency Removal Method

맵 기반의 부분시간 공통 중간주파수 제거방식을 이용한 GNSS 신호의 상관 기법

  • 임성혁 (건국대학교 전자정보통신공학과) ;
  • 지규인 (건국대학교 전자정보통신공학과)
  • Published : 2008.07.01


In this paper, we propose the efficient Doppler removal method using map-based partial-time common intermediate frequency removal technique. In the proposed algorithm, the 2-stage carrier removal process was used. First, the component of common intermediate frequency is removed. Next the component of Doppler was removed with averaging and approximation. For the evaluation of the proposed algorithm, The real-time software GPS L1 C/A-code receiver was implemented. When the proposed algorithms are used, 12 tracking channels with 3 track arm(early, prompt, late) is operated real-time on PC using a Intel Pentium-III 1.0GHz CPU. Also, the requirement of memory was less than 2Mbytes. The real-time software GNSS receiver using the proposed algorithms provides the navigation solution with below 10 meter rms error. Especially, in spited of using the various approximations for implementing the algorithms, the high sensitivity capability (able to track the weak signal with -159dBm) was achieved.


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