Correcting frequency errors in frequency difference of arrival geolocation systems
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United States of America Patent
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Oct 24, 2017
Grant Date -
Apr 17, 2014
app pub date -
Oct 15, 2013
filing date -
Oct 15, 2012
priority date (Note) -
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Abstract
A frequency correction for frequency difference of arrival geolocation of transmitted target signals may be provided. A frequency of a target signal may be determined at a first collector based upon a first reference timebase source. A frequency of the target signal may be determined at a second collector based upon a second reference timebase source. An observed frequency of a reference carrier signal based upon the first reference timebase source may be determined at the second collector based upon the second reference timebase source. A relative timebase error between the first collector and the second collector may be calculated based upon a difference between the intended frequency of the reference carrier signal and the observed frequency of the reference carrier signal. A corrected frequency difference for the target signal may be calculated based upon the relative timebase error and a proportional scaling factor.
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