Accession Number:
ADD014655
Title:
High Pulse Repetition Frequency Radar Early Warning Receiver.
Descriptive Note:
Patent Application, Filed 4 Oct 89,
Corporate Author:
DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s):
Report Date:
1989-10-04
Pagination or Media Count:
8.0
Abstract:
A ten db coupler receives an RF input signal and transmits an attenuated signal through a widebandnarrow 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 comparators 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
Descriptors:
Subject Categories:
- Active and Passive Radar Detection and Equipment