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Sensors 2015, 15(6), 12180-12204; doi:10.3390/s150612180

GNSS Space-Time Interference Mitigation and Attitude Determination in the Presence of Interference Signals

PLAN Group, Department of Geomatics Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive, N.W., Calgary, AB T2N 1N4, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 17 April 2015 / Accepted: 20 May 2015 / Published: 26 May 2015
(This article belongs to the Section Physical Sensors)
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Abstract

The use of Space-Time Processing (STP) in Global Navigation Satellite System (GNSS) applications is gaining significant attention due to its effectiveness for both narrowband and wideband interference suppression. However, the resulting distortion and bias on the cross correlation functions due to space-time filtering is a major limitation of this technique. Employing the steering vector of the GNSS signals in the filter structure can significantly reduce the distortion on cross correlation functions and lead to more accurate pseudorange measurements. This paper proposes a two-stage interference mitigation approach in which the first stage estimates an interference-free subspace before the acquisition and tracking phases and projects all received signals into this subspace. The next stage estimates array attitude parameters based on detecting and employing GNSS signals that are less distorted due to the projection process. Attitude parameters enable the receiver to estimate the steering vector of each satellite signal and use it in the novel distortionless STP filter to significantly reduce distortion and maximize Signal-to-Noise Ratio (SNR). GPS signals were collected using a six-element antenna array under open sky conditions to first calibrate the antenna array. Simulated interfering signals were then added to the digitized samples in software to verify the applicability of the proposed receiver structure and assess its performance for several interference scenarios. View Full-Text
Keywords: antenna array receiver; global navigation satellite system (GNSS); interference mitigation; space-time processing antenna array receiver; global navigation satellite system (GNSS); interference mitigation; space-time processing
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. (CC BY 4.0).

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MDPI and ACS Style

Daneshmand, S.; Jahromi, A.J.; Broumandan, A.; Lachapelle, G. GNSS Space-Time Interference Mitigation and Attitude Determination in the Presence of Interference Signals. Sensors 2015, 15, 12180-12204.

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