NDLI: Positioning Accuracy Improvement With Differential Correlation

Content Provider	IEEE Xplore Digital Library
Author	Schmid, A.
Copyright Year	2007
Abstract	The success of satellite navigation in the mass consumer market will depend greatly on its performance in deep urban and moderate indoor environments. The signal obstructions in these environments lead to low signal-to-noise ratios, which substantially degrade the positioning accuracy of GPS and Galileo receivers. New ranging techniques are required to increase the positioning accuracy to an acceptable level for pedestrian navigation in urban and indoor environments. Differential correlation is such a new ranging technique. It can replace the state-of-the-art noncoherent integration with very little implementation overheads. It improves performance as it utilizes the statistical properties of GPS and Galileo signals. This paper analyzes the resulting positioning accuracy for GPS and Galileo receivers when differential correlation is utilized. The probability density functions for early-late code discrimination with differential correlation are algebraically derived in closed form. The resulting positioning accuracies are presented for signals with binary phase shift keying (BPSK) and binary offset carrier (BOC) modulation in a large variety of reception conditions. The results indicate that differential correlation can replace noncoherent integration for all relevant configurations of GPS and Galileo receivers. It increases the accuracy of the measured receiver-to-satellite distances by 40% to 77% when compared to noncoherent integration.
Sponsorship	IEEE Signal Processing Society
Starting Page	587
Ending Page	598
Page Count	12
File Size	487262
File Format	PDF
ISSN	19324553
Volume Number	3
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Global Positioning System Filtering Matched filters Indoor environments Signal to noise ratio Frequency Binary phase shift keying Spread spectrum communication Delay Fading spread spectrum communications Code acquisition code division multiplexing correlation Galileo Global Positioning System (GPS) pseudonoise coded communication
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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