Omnistar Survey DGPS Service

Omnistar Geosystems is a differential GPS correction service providing 24-hour accurate and reliable real-time precise positioning on land and in the air in over 40 countries.
The differential signal is transmitted from geo-stationery satellites. Omnistar Survey DGPS corrects some of the errors inherent in any GPS. This system can be used with any Garmin hand-held or mounted unit, or a PDA or computer, and for specific survey, GIS and exploration tasks. Omnistar DGPS achieves accuracies of 3 metres, sub-metre, and down to 10 cm.

Brigalow mapping - nice wildflowers too. Components to use Omnistar DGPS in the field for sub-metre or 3 metre DGPS position

Johnny Appleseed GPS combines Omnistar DGPS backpacks for use with PDAs or computers, or Garmin GPS, and with the Leica field efficient GS20 system suitable for Australia wide applications. Field ready system with ruggedised Nomad PDA and half metre accuracy.

OmniSTAR Pty Ltd has been providing reliable positioning solutions to Australian industry since 1994 and has maintained its position as industry leader through continual research and development into the best, most efficient ways to solve the requirements of different industries. OmniSTAR is one of the most accurate positioning services available in the world today, providing positioning to clients in real time, 24 hours a day. System errors, such as orbit, timing and atmospheric errors, limit the accuracy that can be achieved using the US Global Positioning System satellite service to approximately 10-15 metres.

OmniSTAR - The Global Positioning System More accurate positioning of DGPS is useful in: GIS data collection Asset mapping Utility tagging Environmental monitoring Railway operations Highway and rural road inspections Cadastral surveys Forest management Emergency service assistance Route reconnaissance Aerial observations Photogrammetry control

The OmniSTAR Virtual Base Station (VBS) technology provides users with accurate positioning with a correction message further enhanced for their location. This multiple reference station solution can provide accuracy to within one metre. The OmniSTAR VBS technology uses all reference stations in the vicinity of the receiver and computes a set of enhanced RTCM corrections for the user's position. In this way, the user is provided with corrections without the need to manually select a reference station and is protected from the failure of any single reference station. More information

  Omnistar service includes:
· Field proven service already selected by major manufacturers for inclusion in GIS systems
· Sub-metre, L-Band spot beam solution utilising wide area differential techniques to provide accuracy & reliability
· High immunity to atmospheric, weather and electrical interference
No signal fade as experienced with terrestrial transmitting stations
· Global network of reference stations ensures quality service in all coverage areas
· 24-hour, 365 day monitoring at manned control centres guarantees continuity of service to users
· Precise speed over ground and stable position output·
Flexible system components available with standard PDA, palmtop, laptop or tablet computer, running GIS software, or other Omnistar compatible products including Leica GS20.

How does it work? High quality, precise positioning is achieved via a worldwide network of reference stations, the co-ordinates for which have been carefully established using extensive geodetic observations to ensure system accuracy. Stations are fitted with equipment and back up power supplies to ensure trouble free operation and high levels of reliability. New station in Brisbane, Australia The reference stations pass observed correction data and other status and quality information to network control centres around the world. These provide 24-hour manned monitoring, with extensive quality control procedures to ensure reliable performance.

At the control centres the reference station data is processed and a wide area message and partial corrections generated before being formatted into composite messages for uplink and broadcast. The messages are passed to satellite ground earth stations from where they are uplinked and broadcast over the relevant spot beam satellite. The use of L-Band broadcast and the associated ground facilities has proved extremely reliable in all Thales Survey's global positioning operations. Type Spot beam satellite Frequency L-Band 1.5 GHz Broadcast Data Rate 1200 bits per second Update Rate <5 seconds Message Protocol RTCM SC104 Version 2 Accuracy <1 metre, dependent on GPS receiver chosen

The user receives the wide area signals through a near-omnidirectional antenna attached to a low power, lightweight Omnistar receiver. The receiver is available in OEM or stand-alone form, and an integrated high performance GPS receiver is also an option. Data is output in the industry standard RTCM SC104

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