Automatic detection of GPS SA base value for HFOM
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United States of America Patent
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Aug 4, 2009
Grant Date -
Feb 1, 2007
app pub date -
Jul 29, 2005
filing date -
Jul 29, 2005
priority date (Note) -
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Abstract
An apparatus and method for detecting the type of Selective Availability (SA) engine in a Global Positioning System (GPS) receiver. The apparatus reverse computes a User Equivalent Range Error (UERE) value and filters it. The filtered value is run through a hysteresis to determine the GPS engine type. The engine type determination is used to adjust values used by other systems.
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