Testing of a Field Portable GPS (Global Positioning System) Geodetic Receiver.
DEFENSE MAPPING AGENCY HYDROGRAPHIC/ TOPOGRAPHIC CENTER WASHINGTON DC
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DMA, in cooperation with the USGS and NOAA, is sponsoring the development of a Global Positioning System geodetic receiver which is capable of observing up to four satellites simultaneously by sampling segments of broadcast signals from different satellites in a time-mulitplexing sense using a simple dual frequency channel. The receiver system was designed to measure the geodetic coordinates of points to an accuracy of one meter and to provide first-order estimates of baselines of up to several hundred kilometers in length. In addition, the receiver can support positioning and attitude determination of geophysical survey platforms under low dynamic conditions. Four receiver units have been used in extensive laboratory and field tests. Static positioning tests were designed to determine system performance. These tests have provided data for analysis of point and relative positioning over baselines between 30 meters and 100 kilometers in length. Another series of dynamic tests was designed to evaluate system performance in varying dynamic environments. Tests at the Yuma Proving Ground, AZ, used both a jeep and helicopter as platforms, with a laser positioning system for dynamic reference. Tests by the Naval Oceanographic Office in Bay St. Louis, MS, used a 36-foot motor launch as a platform, with a set of trisponders used as the reference system.