Unidirectional Amplitude Sensitive Noise Riding Threshold Circuit.
Patent, Filed 30 Jun 89, patented 24 Apr 90,
DEPARTMENT OF THE NAVY WASHINGTON DC
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An RF multiplexer divides an incoming signal from an RF antenna into discrete frequency bands. Each frequency band has its own separate circuit on separate lines to operate on the frequency band and determine if a radar signal is present or if only noise is present on the line. This is done by comparing the incoming signal for magnitude with a DC signal that is generated within the circuit and is proportional to the noise within the frequency band. An indication that any of the signals within the discrete frequency bands exceed the DC signal generated within the same band results in an alarm indication. Keywords Patents, PAT-CL-342-91.
- Radio Communications