Method of position fixing active sources utilizing differential

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

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343112C, G01S 302

Patent

active

043509843

ABSTRACT:
A method of position fixing an active transmitter source. At least two passive receivers are utilized to position fix at least one active transmitter source by obtaining the difference of the doppler frequencies received at the passive receivers, the receivers being tuned to the transmitter frequency. This differential doppler frequency is processed together with navigational information relative to the passive receiver positions at selected measurement intervals along a given measurement path of receiver movement, in order to fix the unknown position of the active transmitter source.

REFERENCES:
patent: 2968034 (1961-01-01), Cafarelli, Jr.
patent: 3155937 (1964-11-01), Grimm et al.
patent: 3242487 (1966-03-01), Hammack
patent: 3445847 (1969-05-01), Hammack
patent: 3706096 (1972-12-01), Hammack

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