SONIC DETECTION AND TRACKING SYSTEM
Assignee
Filed
Apr 30, 1970
Granted
Jun 18, 1991
Location
HATBORO PA US
Abstract
Two submerged rotatable sets of transmitting and receiving transducers areongitudinally spaced along the side of a river to establish intersecting lateral sonar beams obliquely oriented at opposing 45° angles relative to the primary river current. Each beam can be slewed in opposite directions through 45° to parallel orientation with the current. The outputs of the transducer arrays are passed to respective doppler sonar detection units which produce alarm output signals when the normalized doppler frequency shift within at least one of a plurality of narrow frequency bands in each unit exceeds a predetermined level. The transmitting frequency of each array is varied with rotation of the array. If only one beam detects a target, a control circuit causes the other beam to slew until it acquires the target. With detection by both beams, the position of the target can be computed from the bearing angles of the arrays.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Jul 22, 1982
Rescinded
Nov 8, 1990
Duration
8 years, 3 months
Inventor
- 1HENRY SUTER
Record Details
- Patent number
- US 5025425
- Application
- 05043616
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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