2010
DOI: 10.1017/s037346331000038x
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Open Source GNSS Reference Server for Assisted-Global Navigation Satellite Systems

Abstract: Assisted-Global Navigation Satellite Systems (A-GNSS), or Assisted-Global Positioning Systems (A-GPS) in particular, are now commonly accepted as an effective way to reduce the time-to-first-fix (TTFF) in GNSS-unfriendly environments, e.g. in areas of weak GNSS signals. Today's location-based service (LBS) devices such as GPS-enabled mobile phones and personal digital assistants (PDA) rely on A-GPS; however, such commercial devices are equipped with an integrated A-GPS chip that makes customisation very diffic… Show more

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Cited by 9 publications
(3 citation statements)
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“…For outdoor positioning, the Global Satellite Systems (GNSSs) such as American Global Positioning System (GPS) and Chinese Beidou Satellite Navigation System are performing very well. However, GNSSs are not suitable for indoor positioning as the satellite signal propagation can be easily interfered by indoor complex environment [1]. Therefore, other positioning solutions should be implemented for indoor positioning and navigation.…”
Section: Introductionmentioning
confidence: 99%
“…For outdoor positioning, the Global Satellite Systems (GNSSs) such as American Global Positioning System (GPS) and Chinese Beidou Satellite Navigation System are performing very well. However, GNSSs are not suitable for indoor positioning as the satellite signal propagation can be easily interfered by indoor complex environment [1]. Therefore, other positioning solutions should be implemented for indoor positioning and navigation.…”
Section: Introductionmentioning
confidence: 99%
“…For outdoor environments, a Global Navigation Satellite System (GNSS) such as Global Positioning System (GPS) is ideal. However, GPS is not suitable for indoor environments as the satellite signals cannot penetrate walls or roof of buildings [3,4]. Furthermore, when assisted-GPS techniques are used, the position may have errors of tens of meters [5].…”
Section: Introductionmentioning
confidence: 99%
“…Global Navigation Satellite Systems (GNSS) such as Global Positioning System (GPS) provides accurate outdoor positioning solution (several metres accuracy); however, GPS does not have comparable indoor positioning accuracy as the signal from GPS satellites cannot penetrate walls of buildings [1]. Thus, research on indoor positioning is carried out to acknowledge and alleviate the problems regarding conventional method of positioning, Indoor positioning methods are extensively researched and highly on demand.…”
Section: Introductionmentioning
confidence: 99%