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US Patent 7868820 Ionosphere modeling apparatus and methods

Patent 7868820 was granted and assigned to Trimble navigation, Ltd. on January, 2011 by the United States Patent and Trademark Office.

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Patent abstract

Methods and apparatus which characterize the ionospheric error across a network of GNSS reference stations are presented. The method relies on dual-frequency phase measurements in a geometry-free linear combination. The data are filtered for ambiguities and the characteristic parameters of the ionosphere. In combination with filter results from other combinations of phase measurements (ionosphere free combination), the physically-based model provides rapid and reliable ambiguity resolution.

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