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Direction finding interferometer internal calibration system

  • US 4,494,118 A
  • Filed: 08/18/1983
  • Issued: 01/15/1985
  • Est. Priority Date: 08/18/1983
  • Status: Expired due to Fees
First Claim
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1. An internal calibration system for use with a direction finding interferometer having a plurality or receiving antenna elements, a local oscillator, at least one phase meter, and a plurality of channel receiving means associated with each said receiving antenna element, each said channel receiving means including a radio-frequency preamplifier, a mixer connected to both said radio-frequency preamplifier and said local oscillator, and an internal intermediate-frequency amplifier connected to said mixer and one of said at least one phase meter, said internal calibrations system comprising:

  • plural power dividers, each power divider having an input and first and second outputs, each power divider being associated with one of said channel receiving means, the second output of each power divider being operatively connected to the associated of said channel receiving means;

    a master switch operatively connected to said power dividers for directing a calibrate signal to selected of said power dividers;

    a signal source for providing the calibrate signal to said master switch;

    at least one inter-channel transmission line switchably connected to the first output of each of two of said power dividers; and

    secondary switching means associated with each power divider to permit the calibrate signal to bypass said power divider while passing from one of said at least one inter-channel transmission line to the associated channel receiving means.

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