VLF radio position location system

Details VLF radio position location system VLF radio position location system

1976-10-22

1978-05-02

Birmiel, Howard A.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343103, 343112D, G01S 130, G01S 514

Patent

active

040878163

ABSTRACT:
A low frequency radio position location system for aircraft or other vehicles for operating in conjunction with ground stations transmitting at a first VLF radio frequency which is shifted in frequency by a small amount to a second frequency at fixed intervals with the shifting being carried out coherently with a defined transition point at the frequency signal is made up of an RF receiver and amplifier, a phase-locked loop for providing a continuous output frequency signal precisely locked to the first frequency, a detector for deriving a signal at the modulation frequency, a phase comparator for comparing the phase relationship of the derived modulation frequency signal to the phase relationship of the output frequency signal and the second frequency signal. The derived modulation frequency signal and its phase information is then available for providing distance and position information in relation to the ground stations.

REFERENCES:
navigation, vol. 21, No. 2, Summer 1974, pp. 117-133.
Western Electric Eng., vol. 16, No. 4, Oct. 1972, pp. 2-7.

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