High Pulse Repetition Frequency Radar Early Warning Receiver.
Abstract
A ten db coupler receives an RF input signal and transmits an attenuated signal through a wideband/narrow band select switch to an RF amplifier. The signal is next processed through an RF amplitude detector. A comparator then receives the signal and generates a pulse in response to signals exceeding a predetermined threshold. A pulse stretcher then eliminates excessive pulses due to noise or other signal oscillations that exceeded the comparator's threshold. A circuit comprising a retriggerable monostable and an OR gate determine if the pulses received exceed a pulse repetition frequency threshold. A ripple counter then eliminates unwanted signals by resetting if a predetermined number is not reached in a specified time. A unique audio signal is then generated if the desired signal is detected. the output signal is audible even though the input signal is of a frequency above the normal hearing threshold. Also a visual signal is provided by a light emitting diode. Keywords: Patent applications. (rh)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 04, 1989
- Accession Number
- ADD014655
Entities
People
- David J. Swanick
- William P. Huntley
Organizations
- United States Department of the Navy