GPS Multipath Parameterization using the Extended Kalman Filter and a Dual LHCP/RHCP Antenna

Ashkan Izadpanah, Cillian O’Driscoll, Gérard Lachapelle

Abstract:	Multipath interference is among the main sources of errors in the code delay estimation process where extra paths are added to the Line-of-Sight (LOS) signal. In this research work, a multipath parameterization technique based on the Extended Kalman filter (EKF) is developed and then tested in an outdoor multipath environment. The algorithm uses the accumulated In-phase and Quadrature phase (I and Q) samples of multiple branches of correlators as measurements to estimate the amplitude, code delay, carrier Doppler and carrier phase parameters of the LOS and embedded multipath (MP) signals. This multipath estimation technique (Kalman multipath technique) is then verified using simulated data from a Spirent GSS 7700 Hardware simulator. The Kalman multipath (KMP) technique is then applied to signals collected from a dual polarized Right Hand Circularly Polarized (RHCP)/Left Hand Circularly Polarized (LHCP) antenna in a real multipath environment. Data sets from this antenna along with the KMP algorithm are then used to characterize the GPS multipath in this real multipath scenario.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	689 - 697
Cite this article:	Izadpanah, Ashkan, O’Driscoll, Cillian, Lachapelle, Gérard, "GPS Multipath Parameterization using the Extended Kalman Filter and a Dual LHCP/RHCP Antenna," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 689-697.
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