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Method and apparatus for calibrating phased array receiving antennas

  • US 5,248,982 A
  • Filed: 07/15/1992
  • Issued: 09/28/1993
  • Est. Priority Date: 08/29/1991
  • Status: Expired due to Term
First Claim
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1. A calibrator for calibrating phased array antennas which include a plurality of individual antenna receiving and delay elements, the calibrator comprising:

  • calibration signal generating means for generating first and second separable calibration signals;

    calibration cable means including a calibration signal cable having opposite ends connected to respective outputs of the calibration signal generating means for receiving respective ones of the first and second calibration signals;

    calibration signal injecting means connecting the calibration signal cable to inputs of each of the antenna receiving elements;

    power summing means coupled to outputs of the antenna delay elements;

    delay measurement means coupled to the calibration signal generating means and to the power summing means for measuring calibration signal delays or phase shifts of the first and second calibration signals at outputs of each of the antenna delay elements; and

    computer means coupled between the delay measurement means and the antenna delay elements for summing and averaging the measured signal delays or phase shifts in the first and second calibration signals, and for adjusting the signal delays or phase shifts of selected antenna delay elements in response thereto.

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