Accession Number : ADD009721

Title :   Simultaneous Signal Detector for an Instantaneous Frequency Measurement Receiver.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Tsui,James B Y ; Shaw,Rudy L ; Caschera,Joseph

Report Date : 22 Jun 1982

Pagination or Media Count : 7

Abstract : This report describes an apparatus for use in conjunction with an instantaneous frequency measurement (IFM) receiver, for detecting the presence of two or more RF signals, differing in frequency, between the onset of the first RF signal pulse and the completion of the frequency encoding strobe. High frequency sample and hold circuits detect the level of the video upon stabilization of the leading edge of the first received pulse. Thereafter, comparators monitor both the video and sampled levels to detect defined differences therebetween. Monitoring ceases at the termination of the frequency encode strobe. Ambiguities in the encode frequency are detected by comparator unbalances, which actuate the inputs to a logic OR gate. The output of the OR gate is connected to a logic AND gate, whose other input changes in level upon the termination of the encode strobe. The output of the AND gate latches an alarm, signalling the IFM receiver that the frequency measurement is ambiguous.

Descriptors :   *Patents, *Frequency meters, *Radar interception, NOR gates, Nand gates, Radar signatures, Radar pulses, Frequency, Gates(Circuits)

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE