Abstract
A Doppler tracking system has been developed to enable continuous real-time measurement of the motion of suspended hydrophones. The system consists of three bottom-moored CW beacons, a phase detector for each beacon signal, and a computer processing scheme. Displacements as small as 1 cm have been detected in ship-mounted, ship-suspended, sonobuoy-deployed, and bottom-moored hydrophones at ranges up to 10 km. The system was used to coherently phase detect low-frequency acoustic transmissions by using displacement information to correct the Doppler shift due to hydrophone motion; however, its applicability extends to any environment where highly accurate mooring motion must be measured. An analysis of the combined effects of surface and forward volume scattering shows that these phenomena do not compromise the tracking system. Random phase fluctuations in beacon signals attributable to these effects were estimated to be less than 0.2 rad. An analysis of hydrophone motion derived from data obtained during two ocean tests of the system is presented in this paper.
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