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- W307973192 abstract "Abstract : We examine the effects of the rooftop environment on GPS time transfer, in particular the effects of multipath reflections from nearby metallic objects. Three different antenna sites on the roof of the NIST laboratories at Boulder, Colorado, were selected, each with different multipath characteristics that we discuss. Simultaneous tests were conducted at each site with the same model of L1 band GPS receiver, but with different types of antennas. Four different types of active antennas with low-noise amplifiers were used at each site: a patch antenna, a patch antenna with a simple choke ring attached, a quadrifilar helix, and a pinwheel antenna with an aperture coupled slot array design. Results are presented that demonstrate how each antenna performs in each multipath environment, with the time deviation (sigma sub x(tau)) used as a metric. We also discuss the potentially harmful effects on time transfer caused by RF interference from other active GPS antennas located on the same roof." @default.
- W307973192 created "2016-06-24" @default.
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- W307973192 date "2006-12-09" @default.
- W307973192 modified "2023-09-23" @default.
- W307973192 title "Effects of the Rooftop Environment on GPS Time Transfer" @default.
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