Title: Multiple frequency navigation radar system

Abstract: A navigation system in which a transmitter-antenna combination radiates two independent signals with a known frequency separation there between. These signals are radiated to an antenna on a navigation marker whereby they are received and directed to a non-linear device in which signals at the fundamental frequencies and frequencies that are linear combinations of the two fundamental frequencies are generated. These generated signals are then guided to the antenna and retro-directively re-radiated. The re-radiated signals are received by an antenna at the transmitting location and directed to a receiver wherein the fundamental frequencies and the desired linear combination thereof are detected and processed to provide the locations and identification of the navigation markers.

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Inventors: Isbister, Eric J. (Greenlawn, NY, US)

Application Number: 630553
Filing Date: 1975-11-10
Publication_date: 1977-06-21
Assignee: Sperry Rand Corporation (New York, NY)
Primary Class(es): 342/46 342/6, 342/11
Other Classes:
US Patent Ref:

3798642	Mar, 1974	Augenblick et al	343/6.
3896440	Jul, 1975	Wheeler	343/18.
3944928	Mar, 1976	Augenblick et al	343/6.

Other Refs:
Primary Examiner: Tubbesing, T.H.
Assistant Examiner:
Attorney: Terry; Howard P., Levine; Seymour