Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1982-09-21
1985-02-19
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
455165, 455 67, 375 10, H04B 1700
Patent
active
045010200
ABSTRACT:
A method and an apparatus for surveilling RF signals, the apparatus comprising a receiver for receiving RF signals at a selectively variable reception frequency and converting any signal received at that frequency to a predetermined IF signal, a sampling circuit for sampling the IF signal and providing output signals representative of a plurality of predetermined properties of the received signal; a circuit for comparing the representative output signals against a plurality of sets of reference signals each of which is representative of a particular modulation type and providing a first output indicative of the type of modulation of the received signal when the representative signals substantially match the set of reference values of one of the modulation types and a second output indicative of an unidentified received signal when the representative signals do not match any of the sets of reference signals.
REFERENCES:
patent: 3736510 (1973-05-01), Wu
patent: 3771059 (1973-11-01), Butler et al.
patent: 4166980 (1979-09-01), Apostolos et al.
patent: 4227255 (1980-10-01), Carrick et al.
patent: 4270217 (1981-05-01), Baker
"Modulation Analyzer FAM for 55 kHz Through 1.36 GHZ" by Burkhart et al., 1980.
IEE Symposium Paper Entitled "Microprocessor Control Structure"; Apr. 16-18, 1980.
"Ceres-a Computer-Aided Radio Monitoring and Surveillance System"; S. Faulkner, International Defense Review 3/1977, pp. 503-506.
Her Majesty in Right of Canada
Ng Jin F.
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