Abstract
There are many factors which may influence the performance of GPS antennas. These include differences in the design of the antennas, manufacturing variability between antennas of the same model, the material which surrounds the antenna (including the antenna mount and radome), and the frequency range over which the antenna is used. As part of an ongoing program of antenna measurement, we have characterized a large number of GPS antennas in the anechoic chamber at the Goddard Space Flight Center in a variety of configurations. This paper examines the effect of reflectors under the antenna, the effect of radomes as a function of frequency, the effect of the preamplifier, and the influence of antenna design. These effects can lead to vertical displacements of the antenna phase centers from a few millimeters to several centimeters.
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