Off-Board Positioning using an Efficient GNSS SNAP Processing Algorithm

D. Rosenfeld, E. Duchovny

Abstract:	A method is described for off-board positioning using an efficient algorithm for processing GNSS snapshots. Snapshot data (SNAP) is generated using a digital baseband snapshot receiver. The described method is advantageous for emerging applications such as geotagging, data logging and tracking, and results in lower power consumption, better time-to-first-fix (TTFF) and higher accuracy than traditional real-time navigation receivers. The described method separates data capture, which must be performed in real-time, from processing, which may be performed in a distributed manner. Distributed processing is conducted using an efficient GNSS signal processing algorithm. This reduces processing time for the off-board solution while enabling high sensitivity measurements. The method also enables dynamic selection between an off-board GNSS solution and an on-board GNSS solution. This is achieved by utilizing a host-based solution architecture that enables a host-selectable mode of operation. Operating mode may either be automatically selected by the system to fit operating conditions, or may be manually selected by the user. There are various applications in which there is an advantage to using the off-board method or a hybrid on/offboard solution. The main advantages of the off-board method are lower power consumption required on the capture device and very short TTFF. The applications that may benefit the most from using the off-board method are those that do not require real-time position output such as tracking devices and multimedia geotagging applications. A prototype system, in which the off-board positioning method is utilized, has been built and verified. Initial testing of the system demonstrates accurate and consistent positioning results in various environments and conditions.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	1088 - 1093
Cite this article:	Rosenfeld, D., Duchovny, E., "Off-Board Positioning using an Efficient GNSS SNAP Processing Algorithm," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 1088-1093.
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