Communications: directive radio wave systems and devices (e.g. – Radar ew – Detection of surveilance
Patent
1997-09-12
1998-12-22
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar ew
Detection of surveilance
455227, G01S 740
Patent
active
058524177
ABSTRACT:
A radar detector suppresses nuisance alerts due to detection of a third harmonic of a common LO signal of other radar detectors by detecting a second harmonic of the offending LO signal. If a detected radar signal in the K.sub.a band is of a frequency within a suspect range corresponding to possible third harmonic spurious LO signals, a determination is made as to whether a potential alert blocking signal around the second harmonic of a nominal 11.55 Ghz signal is also present. In the illustrated embodiment, the second harmonic alert blocking signal which is checked has a frequency which is 2/3 the frequency of the detected K.sub.a signal .+-. a guard band of, for example .+-.40 Mhz, and is within a range of frequencies from about 22.813 Ghz to about 23.8 Ghz. If no blocking signal has been detected within about 10 seconds before or within three sweeps after detection of the K.sub.a band signal in the suspect range, the detected K.sub.a band signal is reported. If a blocking signal is detected, the signal strength of the detected K.sub.a band signal is examined relative to the signal strength of the blocking signal. If the K.sub.a band signal strength is greater than a reporting threshold and also is greater than the signal strength of the blocking signal by a minimum threshold, the detected K.sub.a band signal is reported. Otherwise the detected K.sub.a band signal is treated as a nuisance signal generated by a nearby radar detector and suppressed.
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Groth Clarence Richard
Scholl Stephen Ray
Valentine Michael David
Sotomayor John B.
Valentine Research, Inc.
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