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Method and apparatus for monitoring vehicular traffic

  • US 5,075,680 A
  • Filed: 09/14/1990
  • Issued: 12/24/1991
  • Est. Priority Date: 09/14/1990
  • Status: Expired due to Fees
First Claim
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1. An apparatus for counting an and analyzing air traffic comprising at least one individual type of aircraft generating sound and conducting one of a plurality of possible flight operations at an airport comprising:

  • radar means for generating and propagating radar radiation of a predetermined wavelength to be directed towards a target and for converting any doppler-shifted radar radiation reflected by said target into first electronic signals corresponding to said reflected doppler radiation;

    reflector means having a focus for directing said radar radiation generated by said radar means toward target air traffic conducting flight operations and for receiving reflected doppler radar radiation reflected by said target air traffic and simultaneously for receiving sound generated by said air traffic conducting flight operations wherein said reflector means further comprises;

    a parabolic primary reflector having an aperture located at its center through which radar radiation may pass, operated at its focus as to sound, and operated in a Cassegrainian mode as to radar radiation, for directing radar radiation towards a target aircraft and for simultaneously receiving reflected doppler radiation and sound; and

    a hyperbolic sub-reflector having a front surface and a rear surface located between said primary reflector and the focus of said primary reflector, for directing radar radiation emanating from said aperture in said primary reflector toward said primary reflector and for directing received reflected doppler radiation from said primary reflector toward said aperture in said primary reflector, said hyperbolic sub-reflector being constructed as to be transmissive of sound;

    microphone means for converting said received sound into a second electronic signal corresponding to said received sound; and

    analyzer means for analyzing said first and second electronic signals to determine a plurality of parameters of said air traffic conducting flight operations at said airport.

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