tailieunhanh - Báo cáo hóa học: "Research Article Multiple Interference Cancellation Performance for GPS Receivers with Dual-Polarized Antenna Arrays Jing Wang and Moe"

vResearch Article Multiple Interference Cancellation Performance for GPS Receivers with Dual-Polarized Antenna Arrays Jing Wang and Moe | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 597613 13 pages doi 2008 597613 Research Article Multiple Interference Cancellation Performance for GPS Receivers with Dual-Polarized Antenna Arrays Jing Wang and Moeness G. Amin Center for Advanced Communications College of Engineering Villanova University Villanova PA 19085 USA Correspondence should be addressed to Moeness G. Amin moeness@ Received 21 June 2007 Revised 31 March 2008 Accepted 25 June 2008 Recommended by Kostas Berberidis This paper examines the interference cancellation performance in global positioning system GPS receivers equipped with dualpolarized antenna arrays. In dense jamming environment different types of interferers can be mitigated by the dual-polarized antennas either acting individually or in conjunction with other receiver antennas. We apply minimum variance distorntionless response MVDR method to a uniform circular dual-polarized antenna array. The MVDR beamformer is constructed for each satellite. Analysis of the eigenstructures of the covariance matrix and the corresponding weight vector polarization characteristics are provided. Depending on the number of jammers and jammer polarizations the array chooses to expend its degrees of freedom to counter the jammer polarization or and use phase coherence to form jammer spatial nulls. Results of interference cancellations demonstrate that applying multiple MVDR beamformers each for one satellite has a superior cancellation performance compared to using only one MVDR beamformer for all satellites in the field of view. Copyright 2008 J. Wang and M. G. Amin. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION GPS is a satellite navigation system used in localization navigation tracking .

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