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Scanning beam radio navigation method and apparatus

  • US 4,080,600 A
  • Filed: 12/03/1976
  • Issued: 03/21/1978
  • Est. Priority Date: 05/20/1976
  • Status: Expired due to Term
First Claim
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1. A method of providing accurate directional information to an aircraft in any angular position about a predetermined axis over a wide angle sector with respect to a ground station comprisingtransmitting radio guidance signals in a sequence of separate electrically scanned sector signals in limited angle sectors within said wide angle sector,transmitting radio signals in conjunction with each of said separate electrically scanned sector signals to uniquely identify the particular sector,the number of said separate sectors at which electrically scanned sector signals are emitted being sufficient to cover all angular positions within said wide angle sector by the combination of all of the separate electrically scanned sector signals,said radio signals transmitted in conjunction with each of said electrically scanned sector signals to uniquely identify the rotational position of said antenna array being transmitted prior to the transmission of the associated electrically scanned sector signals as a part of an information preamble to the sector signals,the information preamble also including other identifying data distinguishing the wide angle sector angular position function from other functions for which similar signals are transmitted.

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