Development of a low-frequency transponder system for penetrator instrumentation
The aim of this project was to create and demonstrate a technique whereby the penetrated depth and position of a model HLW penetrator embedded in deep ocean sediment may be determined, and a communication channel to the penetrator may be established to telemeter parameters measured in-situ. The choice of the frequency of 3.5 kHz for the acoustic link between buried penetrator and ship is justified, based on an acceptable level of signal attenuation in the sediment, an available transducer of moderate size capable of handling the necessary power, and several widely used seismic reflection profiling systems operating at this frequency which can form the shipboard end of the link. By making the penetrator unit a transponder, the penetration depth is obtained directly by the profiler interrogation when the ship is overhead. Using ship navigation whilst manoeuvring within transponder range, the geodetic location of the penetrator can be determined. The penetrator may be relocated long after deployment, for a period of several years, limited essentially by the transponder battery capacity.
Bibliographic Reference: EUR 12779 EN (1991) 147 pp., MF, ECU 8, blow-up copy ECU 18.75
Record Number: 199110290 / Last updated on: 1994-12-02
Original language: en
Available languages: en