Assignee
Filed
Jan 8, 1969
Granted
Jun 1, 1999
Location
Abstract
An underwater combination of a passive and an active acoustic mechanism issed to detect and locate a surfaced or submerged object or target. The passive mechanism utilizes a pair of separated hydrophones to detect an object. The hydrophones are then followed by bandpass filters according to the frequency of interest and the outputs thereof correlated to locate the object. A positive correlation output indication initiates the active acoustic mechanism which then verifies the detection of an object by transmitting a pulse sonar. The output of a transducer responsive to the reflected pulse sonar is then analyzed to indicate whether the detected object is surfaced or submerged and whether the detected object is approaching, departing or stationary.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Oct 28, 1981
Rescinded
Dec 1, 1997
Duration
16 years, 1 month
Record Details
- Patent number
- US 5909409
- Application
- 04791538
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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