Correlator-based multipath detection technique for a global positioning system/ GNSS receiver.
Amani, Elie Djouani, Karim De Boer, Jean-RĂ©mi Kurien, Anish Vigneau, Willy
Amani, Elie
Djouani, Karim
De Boer, Jean-RĂ©mi
Kurien, Anish
Vigneau, Willy
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Abstract
Multipath (MP) is one of the main sources of errors in obtaining precise positioning using global navigation satellite systems (GNSSs) and continues to be extensively studied. In this study, a fast Fourier transform-based MP detection technique
is proposed. The detector is formulated as a binary hypothesis test under the assumption that the MP exists for a sufficient time frame that allows its detection. The detection is based on the quadrature arm of the early-minus-late correlator output (QEmL) for a scalar tracking loop or on the quadrature (QEmL) and/or in-phase arm (IEmL) for a vector tracking loop, using an observation window of N samples. Performance analysis of the proposed detector is done on multiple-ray (up to around 50) MP signals acquired from the MP environment simulator developed by the German Aerospace Centre (DLR in German). Both scalar and vector tracking schemes are used. The application of the detection test to exclusion of MP contaminated satellites from the navigation solution calculation significantly improves positioning accuracy as well as vector tracking performance. This detection technique can be extended to other GNSSs such as GLONASS, Galileo, and Compass with minor adjustments.
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Date
2018-03-24
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Publisher
Wiley Institution of Engineering and Technology (IET)
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Keywords
Multipath (MP), German Aerospace Centre, Global navigation satellite systems (GNSS)