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Apparatus and method for controlling array antenna comprising a plurality of antenna elements with improved incoming beam tracking

  • US 5,585,803 A
  • Filed: 08/29/1995
  • Issued: 12/17/1996
  • Est. Priority Date: 08/29/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus for controlling an array antenna comprising a plurality of antenna elements arranged so as to be adjacent to each other in a predetermined arrangement configuration, the apparatus comprising:

  • transforming means for transforming a plurality of received signals received by said antenna elements of said array antenna into respective pairs of quadrature baseband signals, respectively, using a common local oscillation signal, respective quadrature baseband signals of the pairs of quadrature baseband signals being orthogonal to each other;

    in-phase putting means, comprising a noise suppressing filter having a predetermined transfer function, said in-phase putting means using a predetermined first axis and a predetermined second axis which are orthogonal to each other and a transformation matrix for putting in phase received signals obtained from each two antenna elements of each combination of said plurality of antenna elements being expressed by a two-by-two transformation matrix including(a) second data on said second axis proportional to a product of a sine value of a phase difference between the received signals obtained from said each two antenna elements of each combination, and respective amplitude values of the received signals thereof, and(b) first data on said first axis proportional to a product of a cosine value of a phase difference between the received signals obtained from said each two antenna elements of each combination, and respective amplitude values of the received signals thereof,said in-phase putting means calculating said first data and said second data based on each pair of transformed quadrature baseband signals, passing the calculated first data and the calculated second data through said noise suppressing filter so as to filter said first and second data and output filtered first and second data, calculating respective element values of said transformation matrix based on the filtered first data and the filtered second data, and putting in phase said received signals obtained from said each two antenna elements of each combination based on said transformation matrix including said calculated transformation matrix elements; and

    combining means for combining in phase said plurality of received signals which are put in phase by said in-phase putting means, and outputting an in-phase combined received signal.

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