Transmitter location system for frequencies below HF

Details Transmitter location system for frequencies below HF Transmitter location system for frequencies below HF

1972-04-26

1991-12-17

Wallace, Linda J.

Communications: directive radio wave systems and devices (e.g.,

Directive

Position indicating

342147, 342444, 342450, G01S 302

Patent

active

050737848

ABSTRACT:
Differential phase measurement techniques and apparatus for accurately loing unknown transmitters over great distances at radio frequencies below HF. A network of separated, time- and phase-synchronized, pairs of receiving stations having vertical whip antennas and having a known base-line geometry with respect to each other are used to accurately measure VLF phase differentials. The measured phase differences are compared against theoretical calculated values to provide highly accurate transmitter location information.

REFERENCES:
patent: 2976530 (1961-03-01), Werner et al.
patent: 3118141 (1964-01-01), Bailey

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