Title: Mitigation of ionospheric scintillations for GPS signals under geomagnetic storm conditions using LMS adaptive filter

Authors: M. Sridhar; K. Padma Raju; Ch. Srinivasa Rao; D. Venkata Ratnam

Addresses: Department of ECE, KL University, Guntur, 520002, India ' Department of ECE, University College of Engineering, JNTUK, 533033, India ' Department of ECE, University College of Engineering, JNTUK, 533033, India ' Department of ECE, KL University, Guntur, 520002, India

Abstract: Ionospheric scintillation, an effect due to the electron content density irregularities, is one of the various phenomena of ionosphere that causes deep and rapid signal fading. Scintillations not only cause deep signal fading, but also affect GPS/satellite-based augmentation (SBAS) receiver pseudo range and carrier measurements. As India comes under the low latitude region, more care has to be taken for providing ionospheric differential corrections to GPS users. GPS data collected at KL University (Geographic 16.31°N, 80.37°E) Vaddeswaram, India is considered for the analysis. This location falls under the transition zone between the equatorial trough and the anomaly crest in Indian region. In this paper, spectral analysis of amplitude and phase scintillations is carried out during intense geomagnetic storms, occurred during the period 2013-2014. Statistical parameters of the GPS signal such as scintillation index and power spectral density (PSD) are discussed. LMS adaptive filter turns to be the appropriate filter in mitigating the scintillations. These results would be very much useful for developing a suitable model for ionospheric scintillation for the location.

Keywords: ionospheric scintillation; global positioning systems; GPS signals; spectral analysis; total electron content; TEC; S4 index; phase scintillation index; LMS adaptive filter; least mean squares; geomagnetic storms; signal fading; India; power spectral density; PSD.

DOI: 10.1504/IJICT.2016.079957

International Journal of Information and Communication Technology, 2016 Vol.9 No.4, pp.389 - 407

Received: 09 Jun 2014
Accepted: 09 Oct 2014
Published online: 24 Oct 2016 *

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