Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)
- 2004.11a
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- Pages.204-209
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- 2004
Study on an USBL Positioning Algorithm in a Shallow Water Tank in Noisy Conditions
배경잡음이 존재하는 얕은 수조 내에서의 USBL 위치추적 알고리즘 적용 가능성 연구
- KIM SEA-MOON (Ocean Development System Laboratory, KRISO/KORDI) ;
- LEE PAN-MOOK (Ocean Development System Laboratory, KRISO/KORDI) ;
- LEE CHONG-MOO (Ocean Development System Laboratory, KRISO/KORDI) ;
- LIM YONG-KON (Ocean Development System Laboratory, KRISO/KORDI)
- 김시문 (한국해양연구원 해양개발시스템연구본부) ;
- 이판묵 (한국해양연구원 해양개발시스템연구본부) ;
- 이종무 (한국해양연구원 해양개발시스템연구본부) ;
- 임용곤 (한국해양연구원 해양개발시스템연구본부)
- Published : 2004.11.01
Abstract
It is well known fact that acoustic positioning systems are absolutely needed for various underwater operations. According to the distances between their sensors they are classified into three parts: long baseline(LBL), short baseline(SBL), and ultra-short baseline(USBL). Among them the USBL system is widely used because of its simplicity, although it is the most inaccurate. Recently, in order to increase the positioning accuracy, various USBL systems using broadband signal such as MFSK(Multiple Frequency Shift Keying) are produced. However, their positioning accuracy is still limited by background noise and reflected waves. Therefore, there is difficulty in applying the USBL system using MFSK signal in a shallow water with noisy conditions. In order to examine the effect of the noise and wave reflections this paper analyze position errors for various conditions using numerical simulations. The simulation results say that tile SNR must be greater than 20dB and errors in the vertical direction are slightly increased by wave reflections by upper and lower boundaries.
Keywords
- Multi-Frequency Shift Keying (MFSK);
- Ultra Short Baseline(USBL);
- Underwater Vehicle;
- Signal to Noise Ratio;
- Shallow Water Tank
- 다주파수 천이 변조;
- 초단기선;
- 잠수정;
- 신호대잡음비;
- 얕은 수조;