System and method for frequency domain correction of global navigation satellite system pseudorance measurements in receivers having controlled reception pattern antennas
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United States of America Patent
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Apr 10, 2012
Grant Date -
Oct 6, 2011
app pub date -
Mar 30, 2010
filing date -
Mar 30, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Global Navigation Satellite System (GNSS) pseudorange measurements must be compensated for receiver hardware and directionally dependent antenna errors to obtain desired accuracies for high precision GNSS positioning applications. The problem of pseudorange measurement errors resulting from directionally dependent group delays is not an issue in Fixed Reception Pattern Antenna (FRPA) GNSS sensors. However, for the complex case of a GNSS receiver employing a controlled reception pattern antenna (CRPA) and dynamic beam steering, the multiplicity of combinations of antenna element outputs makes compensation of directionally dependent antenna induced errors more difficult, as the simple subtraction that might be used for FRPA compensation does not work with a CRPA. Example embodiments provide for frequency domain correction of GNSS pseudorange measurements in CRPA receivers. The correction takes place in the signal processing of the satellite signals, after they have been converted to the frequency domain, but before they are formed into beams for the respective satellites.
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