Radar detector
First Claim
1. A radar detecting system comprising:
- antenna means for receiving radar signals;
sweep generator means for producing a sweep signal comprising a cyclical frequency-swept signal over a predetermined range of frequencies and at a predetermined rate;
mixer means coupled with said antenna means and said sweep generator means for mixing said sweep signal and said radar signals to form IF output signals;
bandpass filter means coupled with said mixer means for passing ones of said IF output signals which have frequencies within a predetermined frequency band;
detector means for detecting said IF output signals passed by said bandpass filter means during each cycle of said sweep signal and responsive thereto for producing corresponding output pulses; and
control circuit means coupled with said detector means and responsive to a pair of said output pulses being produced for each of at least three successive cycles of said sweep signal and to both the first pulse and the second pulse of each of said pairs occurring at the same time intervals respectively relative to the corresponding cycle of said sweep signal for producing a warning signal.
1 Assignment
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Accused Products
Abstract
A radar detecting system comprises an antenna for receiving radar signals, a sweep generator for producing a sweep signal over a predetermined range of frequencies and at a predetermined rate and a mixer for mixing the sweep signal with the received radar signal for producing intermediate frequency (IF) signals. A bandpass filter passes only those IF signals within a predetermined frequency band and a detector responds to the IF signals passed by the bandpass filter by producing corresponding output pulses. A control circuit is responsive to a pair of output pulses being produced for each of three successive cycles of the sweep signal and to both the first pulse and the second pulse of each pair of pulses occurring at the same time intervals respectively relative to the corresponding cycle of the sweep signal for producing a warning signal. An alarm circuit comprises a signal strength detector for producing a DC signal having an amplitude which varies in a predetermined fashion in accordance with the level of the received signal and a voltage-to-frequency converter reponsive to the DC signal for producing an alarm signal alternating between a first level and a second level at a frequency which varies in a predetermined fashion in accordance with the amplitude of the DC signal.
35 Citations
15 Claims
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1. A radar detecting system comprising:
- antenna means for receiving radar signals;
sweep generator means for producing a sweep signal comprising a cyclical frequency-swept signal over a predetermined range of frequencies and at a predetermined rate;
mixer means coupled with said antenna means and said sweep generator means for mixing said sweep signal and said radar signals to form IF output signals;
bandpass filter means coupled with said mixer means for passing ones of said IF output signals which have frequencies within a predetermined frequency band;
detector means for detecting said IF output signals passed by said bandpass filter means during each cycle of said sweep signal and responsive thereto for producing corresponding output pulses; and
control circuit means coupled with said detector means and responsive to a pair of said output pulses being produced for each of at least three successive cycles of said sweep signal and to both the first pulse and the second pulse of each of said pairs occurring at the same time intervals respectively relative to the corresponding cycle of said sweep signal for producing a warning signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- antenna means for receiving radar signals;
Specification