SUBLORAN-A SONIC UNDERWATER LONG RANGE AID TO NAVIGATION EMPLOYING CROSS -CORRELATION OF FM-CW SIGNALS

Serge Wisotsky and Joseph A. Dolan

Peer Reviewed

Abstract:	THIS UNDERWATER NAVIGATION scheme determines local position by measuring the sonic transit time to the point in question of three difference acoustic programs from three sound sources stationed at three widely separated but know locations. The transit time is identified as the time period that an identical program at the receiver must be delayed from an established schedule in order for it to be synchronized or correlated wit the acoustic program received from the transmitter. For example, if a certain musical phrase is scheduled for time 1100 hours and it is received at the time 1100 hours plus 10 seconds, then the separation between receiver and transmitter is roughly 10 miles. Specifically, this transit time when multiplied by a predetermined value for the acoustic propagation velocity results in the measure of the distance of separation between the sound source and the acoustic receiver. A good value of the sound velocity for the particular area under consideration may be obtained by its measurement between the widely spaced transmitters using the technique described herein.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 13, Number 2
Pages:	148 - 153
Cite this article:	Wisotsky, Serge, Dolan, Joseph A., "SUBLORAN-A SONIC UNDERWATER LONG RANGE AID TO NAVIGATION EMPLOYING CROSS -CORRELATION OF FM-CW SIGNALS", NAVIGATION: Journal of The Institute of Navigation, Vol. 13, No. 2, Summer 1966, pp. 148-153.
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