Communications: directive radio wave systems and devices (e.g. – Radar ew – Detection of surveilance
Patent
1991-01-24
1991-11-26
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Radar ew
Detection of surveilance
G01S 742
Patent
active
050686631
ABSTRACT:
A radar detector for use in a motor vehicle employs amplitude detection to sense the presence of radar signals commonly used to monitor the speed of such motor vehicles. Amplitude signals are generated by down-converting received signals using a series of mixers, one of which is swept to insure signal detection, and compared to a threshold which is controlled such that noise is detected by the comparison on average a selected period of time. Detected amplitude signals must persist for a given period of time before they are considered to be potentially valid radar signals. After passing the first test of persistence, the signals are verified by means of frequency modulating the first of the series of mixers, detecting the frequency modulation and correlating the detected frequency modulation to determine whether the signal is valid and if so, to which radar frequency band the signal belongs. A first embodiment of the radar detector monitors the X band (10.475-10.575 Ghz), the Ku band (13.400-13.500 Ghz), the K band (24.025-24.275 Ghz), and the Ka band (34.200-35.200 Ghz) and a second embodiment monitors all of these radar signal bands plus and expanded Ka band (34.200-35.200 Ghz).
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Nusair Marwan E.
Scholl Stephen R.
Valentine Michael D.
Hellner Mark
Valentine Research, Inc.
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