Title: Secret depth sounder

Abstract: 1. The method of measuring depth of a body of water comprising the steps of ecording the natural ambient noises at the location where the depth is to be measured, projecting the recorded noises back into the surrounding body of water, receiving the reflection of said projected recorded noises, and correlating the reflected noises with the projected recorded noises delayed in time.

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Other info:

Inventors: Johnston, Thomas F. (Silver Spring, MD, US)
Robinson, Aaron Z. (Hyattsville, MD, US)

Application Number: 804053
Filing Date: 1959-04-03
Publication_date: 1978-04-25
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Class(es): 367/100 367/1, 367/113
Other Classes:
US Patent Ref:

2253975	Aug, 1941	Guznellz	343/100.
2688124	Aug, 1954	Doty et al.	343/100.
2800654	Jul, 1957	De Rosa	343/100.
2907400	Oct, 1959	Swafford	343/100.
2981927	Apr, 1961	McKenney	340/3.

Other Refs:
Primary Examiner: Farley, Richard A.
Assistant Examiner:
Attorney: Sciascia; R. S., Branning; A. L.