| Project/Area Number |
16360434
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Tokyo University of Marine Science and Technology |
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Principal Investigator |
MIYAMOTO Yosinori Tokyo University of Marine Science and Technology, Faculty of Marine Science, Associate Professor, 海洋科学部, 助教授 (80251685)
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| Co-Investigator(Kenkyū-buntansha) |
UCHIDA Keiichi Tokyo University of Marine Science and Technology, Faculty of Marine Science, Assistant Professor, 海洋科学部, 助手 (50313391)
FURUSAWA Masahiko Tokyo University of Marine Science and Technology, Faculty of Marine Science, Professor, 海洋科学部, 教授 (60281002)
KAKIHARA Toshiharu Tokyo University of Marine Science and Technology, Faculty of Marine Science, Professor, 海洋科学部, 教授 (50114913)
MING Fan chun Tokyo University of Marine Science and Technology, Faculty of Marine Science, Assistant Professor, 海洋科学部, 助手 (10311664)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2006: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2005: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2004: ¥7,800,000 (Direct Cost: ¥7,800,000)
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| Keywords | Underwater positioning system / Short base line / Phase difference / Ultra sonic / Digital signal processing / Wireless LAN |
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| Research Abstract |
The pulse of an ultrasonic transmitter (pinger) was received by four wide bands hydrophones, and the underwater positioning system of the SBL (Short Base Line) system that measures a 3-dimensional underwater position on real time was developed. The signal from hydrophone was made to take into high speed ADC (Analog Digital Converter, sampling frequency is 80MHz) via a preamplifier. The reference signal (the complex number signal) of quadrature detection was generated by DDS (Direct Digital synthesizer). Received signals were demodulated to baseband (100kHz) using the multiplication of the complex number signal and the ADC output. The receiving time difference was calculated using cross correlation from the signal after demodulation. It became possible to measure the receiving time difference of the received signal from pinger by the resolution of 0.01msec. Four circuits of detection and digital filtering were established in FPGA (Field Programmable Gate Array). However, arrangement of hydrophones influences the positioning accuracy of pinger. Examination of DOP (Dilution Of Precision) by arrangement of hydrophones was also performed.
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