Secret Depth Sounder.
DEPARTMENT OF THE NAVY WASHINGTON D C
Pagination or Media Count:
The method of measuring depth of a body of water comprising the steps of recording 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. Author
- Acoustic Detection and Detectors