PPT Slide

? Each antenna type has a unique phase pattern

? Each antenna type has a unique set of constants

? GPS antennas must be calibrated

? Mixing uncorrected antenna types can produce errors of up to 10 cm in the vertical component

? NGS is at the forefront in relative field calibration of GPS antennas

? NGS maintains a calibration database with parameters for 88 antenna types (03-26-01)

GPS Antenna Phase Pattern Calibrations

http://www.grdl.noaa.gov/GRD/GPS/Projects/ANTCAL

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