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- W2586300324 abstract "The theoretical attenuation and reflection properties of RFsignals at GPS frequencies are first reviewed. The resultsof a series of tests conducted in May 1998 to determinethe performance of Raytheon Systems’ WAAS antennawhen covered with a layer of ice approximately 0.5 inchthick are then presented. This type of testing is necessaryas many of these antennas will be located at remote,unmanned stations and will be required to operateeffectively under cold weather conditions. The effect ofice loading is quantified by observing changes in (1) thesignal-to-noise ratio (SNR), (2) the position errors and (3)the number of cycle slips observed. The 0.5 inch wetsurface ice loading lead to a reduction in SNR of about 3dB, a raw code horizontal differential position rms error increase of 1 m and a significant increase in the numberof cycle slips observed. The 3 dB loss can be explained bythe reflection of GPS signals at the air-ice interface inaddition to attenuation of the signal transmitted throughthe ice. A simple model shows that most of this 3 dB lossis due to reflection. To verify this, further tests wereconducted under colder temperatures in early January,1999 using various ice thicknesses to analyse the effect ofa dry ice surface." @default.
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- W2586300324 date "1999-01-27" @default.
- W2586300324 modified "2023-09-24" @default.
- W2586300324 title "Effect of Ice Loading of a GPS Antenna" @default.
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