Passive navigation system with frequency coding

Details Passive navigation system with frequency coding Passive navigation system with frequency coding

1976-07-19

1980-02-12

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 171PF, 343 172PC, G01S 9233, G01S 956

Patent

active

041886291

ABSTRACT:
On a vehicle to be navigated, a transmitter for radiating a signal having a plurality of frequencies and a receiver tuned to receive a predetermined harmonic of each of the plurality of frequencies, discriminate between the predetermined harmonics, and determine the range of position markers reradiating each of the predetermined harmonics, with a plurality of passive markers, each having a nonlinear electrical response characteristic and each tuned to reradiate the predetermined harmonic of a different one of the plurality of frequencies when the radiated signal from the transmitter impinges thereon, fixedly mounted at predetermined positions relative to a desired course to be traveled by the vehicle.

REFERENCES:
patent: 2461005 (1949-02-01), Southworth
patent: 3263227 (1966-07-01), Ferry et al.
patent: 3395384 (1968-07-01), Tapply et al.
patent: 3631484 (1971-12-01), Augenblick
patent: 3714653 (1973-01-01), Thor et al.
patent: 3798642 (1974-03-01), Augenblick et al.
patent: 3918056 (1975-11-01), Merrick
patent: 3972042 (1976-07-01), Johnson

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