Compact transmission of GPS information using compressed measurement record format
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United States of America Patent
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Oct 4, 2011
Grant Date -
Apr 8, 2010
app pub date -
Feb 20, 2009
filing date -
Oct 3, 2008
priority date (Note) -
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Abstract
A format for providing messages among GNSS apparatus includes providing a message identification block and a message body. The message identification block includes information specifying a message length and a message type block specifying a message type. Rather than sending all data from one apparatus to another, ambiguous observation data is sent to conserve bandwidth. At the sender a deconstruction of GNSS code and carrier observations using knowledge of the signal structure and constellation geometry, together with simplifications of atmospheric models, allows removal from the observation data of that information which can be implicitly understood or recreated by the recipient. This enables only the necessary information to be packed for transmission to the recipient.
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