Achieving Sub 20 cm Autonomous Positioning Accuracy Using Nexteq PAD Dual-frequency Receivers

Y. Zhang, S. Lee, C. Chen

Abstract:	This paper will introduce Nexteq Navigation’s recently released Precise Autonomous Dual-frequency (PAD) GPS receiver products. Nexteq’s PAD products are extensions of its previous Precise Autonomous Single-frequency (PAS) products and is a simplified and cost-effective alternative to current real-time PPP products on the market, with benefits including no initialization time and no need of subscription for precise orbit and clock corrections. The development is focused on innovations for shortening the initialization time and reducing the dependence on the precise orbit and clock corrections, which are the inherent weakness of traditional PPP. Nexteq’s PAD products have achieved instant sub 20cm stand alone GPS positioning accuracy with freely available SBAS corrections, which makes them outstanding candidates for all kinds of applications requiring precise position solutions and at unprecedented system simplicity and cost-effectiveness. Nexteq PAD products currently include rigid enclosures like the PAD110 and PAD116 products, and the OEM board PAD115 for system integration, and are available for ordering. Testing results showed that Nexteq’s PAD receivers powered by Nexteq’s Freedom technology can readily achieve sub 20 cm positioning accuracy once SBAS corrections are available. Nexteq’s PAD receivers also have outstanding repeatability in harsh environments, including under dense canopy or near tall buildings. This exceptional performance is appealing to applications working in challenging environments.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	1918 - 1925
Cite this article:	Zhang, Y., Lee, S., Chen, C., "Achieving Sub 20 cm Autonomous Positioning Accuracy Using Nexteq PAD Dual-frequency Receivers," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 1918-1925.
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