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Radar apparatus

  • US 6,067,048 A
  • Filed: 02/11/1999
  • Issued: 05/23/2000
  • Est. Priority Date: 02/12/1998
  • Status: Expired due to Term
First Claim
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1. A radar apparatus comprising a transmitting antenna and a receiving antenna, said receiving antenna being an array antenna having a plurality of antenna elements, said radar apparatus being adapted for carrying out the forming and scanning of an antenna beam of said receiving antenna according to a digital beamforming operation, and each of said plurality of antenna elements being comprised of a plurality of elemental antennas so as to have a predetermined directional pattern,wherein a synthetic pattern of the directional pattern of each of said antenna elements and a directional pattern of said transmitting antenna has a depressed shape of relative power at an angle where a grating lobe of said receiving antenna appears, and said forming and scanning of the antenna beam of said receiving antenna is carried out under the assumption that each of said antenna elements has a non-directional pattern, and a directional angle of a main beam is obtained by correcting an angle of the main beam computed under said assumption with a correction value previously determined according to the computed angle.

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