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Method and apparatus for remotely calibrating a phased array system used for satellite communication using a unitary transform encoder

  • US 5,677,696 A
  • Filed: 07/07/1995
  • Issued: 10/14/1997
  • Est. Priority Date: 07/07/1995
  • Status: Expired due to Term
First Claim
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1. A method for remotely calibrating a system having a plurality of N elements, N being a positive integer number, said method comprising the steps of;

  • coherently generating a calibration signal and a reference signal having a predetermined spectral relationship between one another;

    applying to each respective one of said plurality of N elements the calibration signal;

    providing an encoder for encoding the calibration signal applied to each respective one of said plurality of N elements to generate a set of encoded signals, said encoder comprising a unitary transform encoder based upon entries of a predetermined unitary transform matrix T;

    transmitting the set of encoded signals and the reference signal to a remote location;

    coherently detecting the transmitted set of encoded signals at the remote location;

    decoding the coherently detected set of encoded signals to generate a set of decoded signals; and

    processing the set of decoded signals for generating calibration data for each element of said system.

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