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ANTENNA ARRAY FOR AIRCRAFT NAVIGATION SYSTEM

  • US 3,836,970 A
  • Filed: 05/19/1972
  • Issued: 09/17/1974
  • Est. Priority Date: 06/08/1971
  • Status: Expired due to Term
First Claim
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1. An aircraft navigation antenna system for simultaneously covering two synchronous satellites of a satellite navigation system comprising:

  • an electronically phase-controlled antenna array with a plurality of individual radiators which are mounted on the aircraft and which can be controlled for the production of several mutually independent, differently directed beams at an operational frequency by phase controlling the feed to the different radiators with a Butler matrix consisting of a pair of feed lines with inductances in series and phase rotation members across said feed lines and wherein the number of inputs corresponds to the number of individual radiators so that the maximum number of mutually independent selectable beam directions coincides with the number of radiators; and

    a computer carried on said aircraft with a memory in which is stored a known flight path and said computer connected to said Butler matrix to select the correct beam directions during the flight by switching to the correct inputs of said Butler matrix.

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