Vlf radio position location system

Details Vlf radio position location system Vlf radio position location system

G - Physics

01

S

343/85, 343/95

G01S 5/14 (2006.01) G01S 1/30 (2006.01) G01S 11/02 (2006.01)

Patent

CA 1050140

TITLE VLF RADIO POSITION LOCATION SYSTEM Inventors Andrzej Barszczewski Charles D. Hardwick ABSTRACT OF THE DISCLOSURE A low frequency radio position location system for aircraft or other vehicles and adapted 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 said shifting being carried out coherently with a defined transition point at the shifting time, said shifting frequency consituting a modulation frequency signal, comprising: an RF receiver and amplifier, a phase-locked loop for providing a continuous output frequency signal precisely locked to the first frequency, means for deriving a signal at the modulation frequency, phase comparison means for comparing the phase relationship of the derived mo- dulation frequency signal to the phase relationship of the said output frequency signal and the second frequency signal, the said derived modulation frequency signal and its phase information then available for providing distance and position information in relation to said ground station.

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