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UNAVCO 1996 Annual Report

2.2 Improved Measurement Accuracy

A proposal entitled Development of a GPS Calibration System for High-Accuracy Geophysical Applications was submitted to the NSF EAR-IF Program by the Smithsonian Astrophysical Observatory (SAO) on December 30, 1996 with preliminary notice of award on May 21, 1997. The 36 month award of $650,000 represented over two-thirds of the $938,591 requested with the final distribution among collaborative institutions based on review comments and prioritization by the co-Investigators. The collaborators under this grant include SAO, the MIT Department of Earth, Atmospheric and Planetary Sciences (MIT/EAPS), the MIT Haystack Observatory, and the UNAVCO Boulder Facility. First year funding totals $256,200 with SAO as the lead institution and MIT/EAPS, MIT/ Haystack and UNAVCO Boulder performing under subcontracts. Work under the grant will commence in early FY98.

The proposed activities under this grant include: (1) development of algorithms for the determination of multipath from observed GPS signal-to-noise ratios (MIT/EAS - T. Herring); (2) development and construction of an in-situ Multipath Calibration System (SAO - J. Davis and Haystack Observatory - A. Niell), and; (3) laboratory and field measurements of antenna-plus-radome phase patterns and receiver mixing measurements (UNAVCO Boulder Facility - C. Meertens and Haystack Observatory - A. Niell). This multi-institutional approach will result in a series of procedures to completely and quantitatively characterize a GPS antenna/receiver combination within the environment where it is installed at the 1 mm level. Task (1) defined above will emphasize algorithm development and evaluation in FY98 as a prelude to detailed analysis of data from many sites in the following years. Task (2) will focus on detailed technical design and the early construction phase of the MCS in FY98. First year support for Task (3) will include acquisition of data in the field for a variety of antenna, receiver and radome combinations, analysis of the test data, and promulgation of test results. Limited support will be available through this effort to coordinate anechoic chamber antenna tests with Tom Clark at NASA/Goddard and radio frequency interference (RFI) testing through Haystack and the Boulder Facility.

1997 Annual Report - 27 OCT 1997


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