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Channeling-method-and-apparatus

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Channeling method and apparatus

Details

Inventors: LeGrand, Jesse S.;
Assignee: International Telephone and Telegraph Corporation (Nutley, NJ)
Primary Examiner: Tubbesing; T.H.
Assistant Examiner:
Attorney, Agent or Firm: O'Halloran; John T., Van Der Sluys; Peter C., Ingrassia; Vincent

This relates to a channeling scheme for introducing a new service in the TACAN frequency band which can operate independently of the conventional TACAN system or in conjunction with it. Specifically, the new service is that of providing precision DME for a microwave landing system and for allowing existing TACAN airborne sets, when equipped with an adapter, to utilize new MLS ground beacons. In one channeling scheme, interrogations occur in frequency bands adjacent the standard TACAN interrogation band, and ground transmissions occur in frequency bands presently occupied by X mode reply signals. In a second scheme, which contemplates the use of standard airborne equipment provided with an adapter, interrogations occur within the conventional TACAN interrogation band, and replies occur in the bands now occupied by X mode reply signals.

DETAILED DESCRIPTION It is an object of the present invention to provide a channeling method for introducing a precision DME service in the TACAN band, which service can operate independently of the current TACAN system or in conjunction with it.
According to a broad aspect of the invention, there is provided a method of determining distance between an interrogator and a transponder comprising: transmitting from an interrogator X and Y mode interrogation signals within the TACAN frequency band; receiving said interrogation signals at a transponder; transmitting from said transponder and in response to said interrogation signals X and Y mode phase coded reply signals in the first and fourth quarter of the TACAN frequency band; receiving said reply signals at said interrogator; and processing said reply signals to determine distance between said interrogator and said transponder.
The above and other objects of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

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