Phase Centers of GPS IIF Modernization L-Band Antenna

Chang Choi

Abstract:	The phase centers of the GPS IIA L-Band Subsystem (LBS) antenna were simulated by A. W. Love of Boeing and were measured by G. L. Mader of NOAA. Mader measured the phase center by receiving signals from GPS II A satellites on orbit with a GPS IIA Engineering Development Unit (EDU) placed on the top of a building at Boeing, Seal Beach CA. The LBS antenna is a 12 element helix array. The differences between the phase centers by these two methods were large. On the GPS IIF-M program, antenna pattern tests of LBS array antenna were first performed at Point Mugu’s compact antenna range. This data was used to predetermine the extent of the phase center location spread over the LBS frequency band. Then at Rancho Bernardo, CA COI (Composite Optics, Inc) compact range, the phase center measurements of the GPS IIF-M LBS antenna were refined using Point Mugu results. In our measurements, we found that Love’s analytical estimation was closer to our IIF-M measurements of phase centers than those determined by Mader at the L1 frequency.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	241 - 244
Cite this article:	Choi, Chang, "Phase Centers of GPS IIF Modernization L-Band Antenna," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 241-244.
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