INTUDER TARGET MONITORING SONAR ALARM
Assignee
Filed
Aug 26, 1969
Granted
Sep 25, 1990
Location
Abstract
A system for detecting the presence of intruder targets in an area under ar surveillance and in which the number of normal targets may vary, including the processing of gated time sample receiver signals through a first monitoring circuit having a counter and comparator means to develop output signals representing deviation of actual time sample count from a normal reference count, and through a second monitoring circuit including additional counter and count trigger means for developing an alarm signal responsive to continued deviation of actual count from reference count over several actual counts in a time sequence of counts such that normal variation of target number will not produce an alarm signal.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Mar 12, 1982
Rescinded
May 23, 1990
Duration
8 years, 2 months
Record Details
- Patent number
- US 4959817
- Application
- 04853069
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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