Document Type



Virginia Institute of Marine Science

Publication Date



As part of the continental shelf investigations of the Virginia Institute of Marine Science (VIMS) , electronics were developed and tested to track an ocean-current-following (Lagrangian) buoy by the retransmission of Omega navigation signals to a shore station using medium frequency (2 . 398 MHz) ground wave propagation and equal-carrier-upper-sideband modulation . The buoy electronics include sharp clipping and filtering for noise reduction and Omega signal equalization . The carrier and upper sideband are transmitted with equal power to maintain the relative phases of separate Omega station signals on demodulation. The base station is a 2.4 MHz receiver/demodulator feeding a commercial Omega navigation receiver, with minicomputer processing for teletype printout and digital magnetic tape recording. Field trials of this navigation system were performed at VIMS in spring, 1975 .


Oceanographic buoys, Ocean currents -- Measurement

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Oceanography Commons