Precise point positioning (PPP) is a powerful technique that is of great interest in the Global Navigation Satellite Systems (GNSS) community. PPP algorithms compute an absolute position with accuracy at the centimeter level using a few hours of pseudorange and carrier phase data from a single GNSS receiver. The technique relies on the availability of precise satellite orbit and clock information, and on removing or modeling all errors due to satellite, receiver, Earth, and atmospheric effects down to the centimeter level.
PPP techniques are not limited to static datasets; future plans for WIPPS include extending the service to accommodate kinematic datasets (this is why we call it "WIPPS" rather than "WIPPPS"). Another likely future improvement to WIPPS will be the accommodation of other GNSS data (GLONASS, Galileo, others) beyond GPS alone.
The applications that run behind the scenes in WIPPS were developed by leveraging ARL:UT's open source GPS Toolkit (GPSTk). The GPSTk provides platform independent libraries and a suite of applications that help solve processing problems associated with GPS. The interested reader is invited to peruse the GPSTk web site and especially the list of publications detailing work that has been supported by the GPSTk, including a number of papers on PPP.
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