What is SmartNet Aus?

SmartNet Aus is basically a 24/7, accurate, reliable, robust, traceable and repeatable National GPS Network solution, based on a common datum, for the entire positioning community of Australia. Users of SmartNet Aus can expect centimetre level Network RTK accuracies, through to sub-metre DGPS; or raw data for post processing.

SmartNet Aus is the first nationally available commercial GNSS (Global Navigation Satellite System) Network based on raw data from various GNSS networks throughout Australia. This network currently comprises around 100 sites, with an additional contribution of over 100 sites by the Victorian government to be offered from early November.

Who can use it?

Anyone with any make of GPS receiver that can accept RTK or DGPS corrections broadcast by GSM or GPRS (general packet radio). So whether you own a Leica Geosystems, Trimble, Topcon or another make of GPS receiver you are able to gain access to the service via mobile phone technology.

What are the correction formats?

Leica Geosystems, jointly with other RTCM members, has developed and driven the Master Auxiliary Concept (MAC), the future of networked RTK and the basis of the newly approved RTCM 3.1 network RTK messages. Up until now there have been no official internationally accepted standard for network RTK corrections. Today SmartNet Aus already uses these official correction standards.

Standard formats include: RTCM 3x - RTCM 2.3 - DGPS 2.3 (9,2)

What is the RTK (Real Time Kinematic) accuracy?

Assuming the standard GPS RTK protocols and best practice methods are employed for maximum precision i.e. good satellite coverage, good geometry of precisions, low multipath environments etc, SmartNet Aus typically achieves an RTK rms accuracy of 1-2 cm horizontal and 2-3 cm height, in Australia.

What Coordinate system is used?

The GDA94 coordinate system is used throughout the network.

What is GPRS and it‘s coverage?

General Packet Radio Services (GPRS) is a mobile data service on the various 2G and 3G cellular communications networks.  GPRS is one of the latest advancements in mobile data and one of the key reasons why it is now possible to deliver a Network RTK service. It is a GSM Packet Based bearer for the delivery of data services. With GPRS you only pay for the amount of data that you download rather than the duration of the connection.

GPRS providers specify their coverage by a) population and b) Landmass; typically these figures are 99% and 90% respectively. Coverage maps are normally available from the provider’s web site.

Users also have the possibility of using dual sim card phones or adding dual sim slot extensions, so that they have the ability to switch between providers and have maximum coverage and availability between the network providers, such as Telstra, Optus, Vodafone etc

What is a CORS network?

CORS stands for Continuously Operating Reference Station. A CORS network is a network of reference stations that receive positioning signals from GPS/GNSS satellites, and broadcasts RTK corrections. They work together to provide extremely accurate RTK corrections (down to +/- 2 centimeters) for GPS/GNSS receivers. Base stations are typically placed 50 to 70km apart, and all feed into the network over an internet connection where dedicated software (Leica Spider) manages the feeds to compute a position for the user in the field. They are different to stand alone base stations, in that a user can move between baser stations seamlessly, and the RTK corrections are more accurate.