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Experimental Use of GPS Derived Altitude in Hydrographic Surveys

November 07, 2003 - Abstract

C & C has developed C-Nav, a GPS based worldwide real-time precise point positioning system(1). This system is capable of providing a vertical accuracy of 0.24 +/- 0.04 meters at the 95% confidence level in real time in static testing [2]. The system is also capable of producing vertical accuracy of about 0.19 meters at the 95% confidence level during static testing when post processed with data from a monitoring station ~100 nm (nautical miles) away. These accuracies are sufficient for aiding in determining height above chart datum during a hydrographic survey, provided that additional variables associated with field use do not degrade significant performance. This experiment was performed to see how C-Nav height data could be used during an actual hydrographic survey.

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