GPS Carrier Phase Spectrum Estimation for Ionosphere Scintillation Studies

Lei Zhang and Yu Morton

Abstract:	GPS signal carrier phase spectrum is an important measure of ionosphere scintillations. The conventional means of obtaining the carrier phase spectrum is performing FFT of detrended carrier phase estimation generated by the carrier phase lock loop (PLL). The PLL is a feedback system whose outputs are influenced by the system parameters and are not the true representation of the input phase. In this paper, we use simulated GPS signals to demonstrate the distortion of the input carrier phase spectrum by the PLL and receiver noise. An inverse filter and high frequency receiver subtraction method are cascaded following the PLL to restore the original input carrier phase spectrum. The carrier phase spectrum restoration method performance is evaluated using both simulated and real scintillation signals.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	608 - 616
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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