ApplicationNo. 06/648537 filed on 09/06/1984
US Classes:342/20Detection of surveilance
ExaminersPrimary: Tarcza, Thomas H.
Assistant: Hayes, Donald E. Jr.
Attorney, Agent or Firm
International ClassG01S 7/02 (20060101)
AbstractA 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.