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):

• Huntley, William P.
• Swanick, David J.

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:

• *RADAR
• ACOUSTIC SIGNALS
• AMPLITUDE
• BROADBAND
• COMPARATORS
• DETECTORS
• HEARING
• INPUT
• LIGHT EMITTING DIODES
• OSCILLATION
• OUTPUT
• PATENT APPLICATIONS
• PULSE RATE
• PULSE SPACING MODULATION
• RADIOFREQUENCY
• RADIOFREQUENCY AMPLIFIERS
• RESPONSE
• SIGNALS
• THRESHOLD EFFECTS
• THRESHOLDS(PHYSIOLOGY)
• VISUAL SIGNALS

Subject Categories:

• Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE