Development of Trawl Monitoring System ( 1 ) - Distance Measuring System between Trawl Doors -

트롤 모니터링 시스템의 개발에 관한 연구 ( 1 ) - 트롤 전개판의 전개 간격 계측 시스템 -

  • Published : 1997.09.01


We make an ultrasonic system as a trial to measure the distance between trawl doors, and carried out a water tank ($24{\times} 24$m, water depth 1 m) experiment for confirming the practical use of the system in October 1996. This system calculates the distance between the pinger (50 kHz) and the transponder (50 kHz/70 kHz) attached each one on the trawl door by measuring the time-difference of receiving with two channels receiver on the trawler. This paper assums that both the length of the warp from the stern to the trawl door is same. At results the system shows a good relation between the distance and the time-difference of receiving while the location of the pinger is moved in variously in the water tank, and it was found that the method of measuring techniques on the prototype system could be applied to the measurement of the trawl door opening in the field experiment.



  1. Systems & Control Encyclopedia Telemetry, Underwater Mitson, R. B.;Madan G Singh(ed.)
  2. Underwater acoustic positioning systems Milne, P. H.
  3. Japan. Bull. Korean Fish. Tech. Soc. v.28 no.4 Ultrasonic tracking of movements of Striped Jack (Caranx delicatissimus) in the Nunoura Bay Shin, H. O.
  4. J. Japan. Inst. Nav. v.83 Guidance of ROV using multiple pingers of a single frequency Shin, H. O.;E. Hamada;H. Suzuki;Y. Koike
  5. Bull. Korean Fish. Tech. Soc. v.30 no.4 Development of the underwater telemetry system to monitor the behavior of fish (Ⅰ), (Ⅱ), (Ⅲ) Shin, H. I.;D. J. Lee;H. O. Shin;W. W. Lee;J. Y. Ahn
  6. Bull. Korean Fish. Tech. Soc. v.27 no.3 Miniaturization pinger for biotelemetry Shin, H. O.;E. Hamada