National Academies Press: OpenBook

The Global Positioning System: A Shared National Asset (1995)

Chapter: Carrier Phase (Interferometric) GPS

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Suggested Citation:"Carrier Phase (Interferometric) GPS." National Research Council. 1995. The Global Positioning System: A Shared National Asset. Washington, DC: The National Academies Press. doi: 10.17226/4920.
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Page 165

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APPENDIX C 165 Figure C-8 Differential GPS concept. (Courtesy of the Aerospace Corporation) Carrier Phase (Interferometric) GPS In addition to the use of C/A-code, Y-code, or both as measurements of pseudorange for obtaining a position solution, many GPS receivers also measure the L-band carrier phase itself. This enhancement technique can produce very high precision measurements, sometimes as good as 1 to 5 millimeters and, thus, is valuable for high- performance applications. The carrier phase data is used almost exclusively in an interferometric mode, where the phase data from two receivers are processed together to solve for the baseline between them. This eliminates atmospheric errors, and when combined with DGPS, can result in sub-centimeter positioning accuracies.

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The Global Positioning System (GPS) is a satellite-based navigation system that was originally designed for the U.S. military. However, the number of civilian GPS users now exceeds the military users, and many commercial markets have emerged. This book identifies technical improvements that would enhance military, civilian, and commercial use of the GPS. Several technical improvements are recommended that could be made to enhance the overall system performance.

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