Taylor, Scott (2008) Development and testing of a portable GNSS network solution using the magellan propark3. [USQ Project]
With increasing development and expansion of Continuously Operating Reference Station (CORS)networks, globally and at home such as Sydnet, Global Navigation Satellite System users have greater options of utilizing reference station networks to receive correction data and undertake Real Time
surveys without the need of supplying their own base station. A large majority of GNSS built today are
equipped with built in mobile technology which utilize bidirectional communication including Internet
based cellular connections. With increasing coverage of wireless internet, users will be able to utilize
this technology in more places than they could ever before.
The ProMark3 RTK GNSS receiver transmits correction data via a conventional 0.5 watt UHF radio. This allows a working range of up to 1.5km in open areas and 0.3 – 0.7km in urban built up areas. Unidirectional communication such as UHF also has its limitations including line of sight
requirements, transmitter power, broadcasting antenna height limitations, reliability of the link and governmental restrictions such as licensing and operational limitations. Alternative options for
receiving correction data are made available within the ProMark3’s onboard software, which include Networked Transmit of RTCM via Internet Protocol (NTRIP) and Direct Internet Protocol (DIP). These methods can extend that working range to 10km which is the recommended limit for RTK surveying. Built in wireless technology is not present in the ProMark3 however the user can still connect using a separate web enabled phone with Bluetooth technology. The advantage with this option is that the phone can be still used whilst you work, giving you even greater flexibility.
This research project will explore the performance of the ProMark3 using Direct IP. Two different portable base reference stations to broadcast corrections will be designed. They include an office based and field based system. A rigorous testing regime will be conducted to explore the achievable range using Direct IP, the repeatability of position on an established baseline and the time taken to achieve a fixed solution at certain distances. The final part of this project will discuss the application of the technology to the surveying industry, particularly issues of reliability, cost and quality control.
The use of CORS as an alternative to receiving correction data is improving work turn around time and field efficiencies, improving security as only one GPS is being utilized and offering survey firms the chance to experiment with this technology without a large expense upfront.
The concept of a portable Direct IP station will allow users to operate privately run reference station
networks from the office or the field. The benefit of a portable base station is that you can disassemble
the base quickly and take it anywhere you decide to work. This will allow the operator and other users the chance to access data in areas not serviced by CORS and create opportunities for surveyors wanting to experiment with this alternate technology. The future may see an increasing amount of private CORS setup operating within existing government run networks, offering users even greater choice to access spatial data.
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|Item Type:||USQ Project|
|Item Status:||Live Archive|
|Faculty / Department / School:||Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information|
|Date Deposited:||12 Nov 2009 02:13|
|Last Modified:||02 Jul 2013 23:29|
|Uncontrolled Keywords:||GNNS network; magellan propark3|
|Fields of Research :||09 Engineering > 0909 Geomatic Engineering > 090906 Surveying (incl. Hydrographic Surveying)|
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