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DOPPLER RADAR FOR LAND VEHICLES

  • US 3,833,906 A
  • Filed: 02/14/1972
  • Issued: 09/03/1974
  • Est. Priority Date: 02/14/1972
  • Status: Expired due to Term
First Claim
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1. In combination with a land vehicle traveling along a roadway for the vehicle, a system comprising:

  • first generating and doppler detecting means including a diode for generating first high frequency electromagnetic energy and for providing a first doppler signal representative of the difference in frequencies between a returned part of said first high frequency energy and a generated part of said firSt high frequency energy;

    first directing and receiving means including a first horn structure cooperative with said first generating and doppler detecting means for directing at least a portion of said first high frequency energy along a first axis intersecting said roadway and receiving along said first axis a returned part of said first high frequency energy directed along said first axis which is provided to said first generating and doppler detecting means, said first horn structure having an open end directed at said roadway with a first dielectric lens position in said opening and sealingly engaged therewith for protecting said first generating and doppler detecting means, said lens being spaced a predetermined distance from said roadway and having a focal length established in accordance with said distance for focusing said high frequency energy generally at said roadway so as to concentrate said high frequency energy into a restricted area at said roadway;

    second generating and doppler detecting means including a second diode for generating second high frequency electromagnetic energy and for providing a second doppler signal representative of the difference in frequencies between a returned part of said second high frequency energy and a generated part of said second high frequency energy;

    second directing and receiving means including a second horn structure cooperative with said second generating and doppler detecting means for directing at least a portion of said second high frequency energy along a second axis intersecting with said roadway and receiving along said second axis a returned part of said second high frequency energy directed along said second axis, said second axis having a predetermined divergence from said first axis, said second horn structure having an open end directed at said roadway with a second dielectric lens position in said opening and sealingly engaged therewith for protecting said second generating and doppler detecting means, said lens being spaced a predetermined distance from said roadway and having a focal length established in accordance with said distance for focusing said high frequency energy generally at said roadway so as to concentrate said high frequency energy into a restricted area at said roadway; and

    means for accomplishing one of a summation and subtraction of said first and second doppler signals for providing an output signal representative of the one of the sum and difference, respectively, of said first and second doppler signals whereby an operating condition of said vehicle is determinable from said output signal.

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