Abstract
ABSTRACTAccurate determination of depth constitutes one of the critical inputs for a submarine navigation system. The traditional method of basing this determination solely upon a measurement of water pressure demands that a design tradeoff be made between the depth measurement bandwidth (responsiveness) and the degree of rejection of the “noise” component of the pressure signal, arising from surface waves. The technique discussed below comprises a method of overcoming this problem by combining a pressure signal from a piezoelectric transducer with an accelerometer signal from an inertial measurement system. The melding is implemented as a fully digital filter, yielding depth and depth velocity. The algorithm has been incorporated into the design of the DDC Model 6480 retransmission system for the Royal Netherlands Dutch Navy's Walrus class of submarine.
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