Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1984-01-31
1986-04-08
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
340902, 343 171R, 324 77CS, H04B 1700, G01R 2316, G01S 728
Patent
active
045817693
ABSTRACT:
A radar warning receiver includes means for distinguishing pulsed or continuous fixed frequency radar signals emanating from a radar transmitter from variable frequency signals such as those radiated from a nearby superhomodyne receiver. This invention includes a superheterodyne receiver having a local oscillator that is repeatedly varied in frequency over a range of frequencies sufficiently large and at a rate fast enough to cause any signals within an input range of frequencies to be detected by a sensitive, limited bandwidth detector. If an input signal is fixed in frequency, that signal will be detected at the same time during successive sweeps of the local oscillator, and a correlated output will be generated; otherwise, an uncorrelated output will be generated. If the number of correlated outputs equal or exceed the uncorrelated outputs detected, then an alarm is provided. Even when the receiver of this invention is receiving signals from a superhomodyne receiver, if a fixed frequency signal is detected for a predetermined number of consecutive sweeps of the local oscillator, then an alarm, indicating the presence of that fixed frequency signal, is again provided.
REFERENCES:
patent: 4118666 (1978-10-01), Bernstein
patent: 4313216 (1982-01-01), Jaeger et al.
Grimsley Richard L.
Valentine Michael D.
Bookbinder Marc E.
Cincinnati Microwave, Inc.
Telesz Jr. Andrew J.
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