Removing biases in dual frequency GNSS receivers using SBAS
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United States of America Patent
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Dec 27, 2011
Grant Date -
Sep 16, 2010
app pub date -
Mar 11, 2009
filing date -
Mar 11, 2009
priority date (Note) -
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Abstract
A method for removing biases in dual frequency GNSS receivers circumvents the need for ionosphere corrections by using L2(P) in combination with either L1(P) or L1(C/A) to form ionosphere-free ranges. A table of biases is stored in microprocessor controller memory and utilized for computing a location using corrected ionosphere-free pseudo ranges. A system for removing biases in dual frequency GNSS receivers includes a dual frequency GNSS receiver and a controller microprocessor adapted to store a table of bias values for correcting pseudo ranges determined using L2(P) in combination with either L1(P) or L1(C/A).
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