Precise Instantaneous Network Positioning … Inverse Network RTK and Position Server

Yehuda Bock, Jeff Fayman, David Honcik, Paul de Jonge and Lydia Bock

Abstract:	We describe a server/client software suite (RTD Pro/Rover) that supports precise instantaneous network (“PIN”) positioning, based on Geodetics Epoch-by- Epoch™ technology, over TCP/IP and serial communication links. PIN positioning is a network-based real-time methodology, not requiring multi-epoch initialization and re-initialization inherent in RTK surveying and existing network RTK methods. In conventional terms, PIN positioning performs instantaneous network RTK. That is, at each epoch of observations PIN positioning provides an instantaneous constrained network adjustment, using raw data from the local receiver and raw data (not corrections) from multiple reference stations. The RTD server/client supports two unique methods for performing PIN positioning, a direct and inverse approach, which are described in this paper. The direct approach is client heavy and server-light, while the inverse approach is client-light and server-heavy. One of the advantages of the direct approach is that RTD Rover, although especially designed to work with the RTD Pro server, is also compatible with other network RTK software available in the marketplace, or it can be used to collect reference (base) station data (via TCP/IP) from base stations operating autonomously. Some of the advantages of the inverse approach include lighter CPU and bandwidth requirements at the rover. In addition, it allows the TCP/IP streaming of instantaneous network positions to other applications through the RTD Position Server function. RTD Rover is platform independent and does not require in-receiver RTK, allowing the use of legacy equipment. RTD Rover makes use of TCP/IP or RS- 232/Bluetooth communications to field receiver, reference stations and data controllers, such as Carlson SurvCE. We analyze the performance of PIN positioning in terms of precision and robustness in the presence of outliers, with an example from RTD Rover tests in New Zealand. We demonstrate the utility of the RTD Position Server with an example of seismic monitoring in Japan.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	2564 - 2571
Cite this article:	Bock, Yehuda, Fayman, Jeff, Honcik, David, de Jonge, Paul, Bock, Lydia, "Precise Instantaneous Network Positioning … Inverse Network RTK and Position Server," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 2564-2571.
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