Differential Global Positioning Systems
by Rick Lister and Keith Crone Advisors: Dr. Jim Sennott and Mr. Dave Senffner Accurate navigation has been a concern of man since the first sailors
took to the seas. The Global Positioning System (GPS) is the latest navigational
tool available. However, there are many sources of error present in this
system. These include satellite clock bias, satellite location error, ionospheric
disturbance, and multipath distortion. The largest of these error sources,
satellite clock and satellite location, are purposely introduced by the
military to presumably prevent precise navigation by unfriendly forces
and terrorists. Differential GPS, however, allows the elimination these
sources of error. Corrections are made in software using the ranging data
provided by two separate receivers. The error sources common to both receivers
are determined and then removed. Software developed includes the differential
correction generator as well as an iterative scheme for updating the corrected
position.
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