How it works

Real-Time Accuracy

RTK Freedom Network utilizes Geo++® GNSMART procedures to offer the first and only system in the world which offers the possibility of total coverage of homogeneous absolute positioning to centimeter accuracy in real-time. RTK Freedom Network allows users the freedom to use all modern RTK rovers without being restricted to a specified hardware brand requirement.

For the user, this translates to user friendly software that, for the first time, makes it possible to make very accurate measurements. No knowledge of the internal structure of the GNSMART system is necessary. Users receive observations free of systematic errors, which enable them to determine absolute positions with a homogeneous and high standard of accuracy using a single mobile instrument. It is possible for the first time to make very accurate measurements in relation to a high order reference frame without local connecting observations.

 State of the System

The simultaneous adjustment and complete modeling of multi-station observations allows the determination of orbit errors, ionospheric and tropospheric delays as well as the reduction of multipath effects. Antenna phase center variations (PCV) are corrected by using calibrated antennas. This enables the use of different antenna types within a network. Beside the above mentioned state parameters GNSMART contains a complete model for satellite receiver clocks. This allows GNSMART to completely model the absolute state of the system with carrier phase accuracy. Through this, future requirements are fulfilled in an optimal sense (expansion to regional and global networks, higher accuracy or new applications).

Central or Decentral

Networks are organized in a central or decentral manner. In the central configuration, all observations are simultaneously processed in a computing center. The software model GNREF are configured to run at the remote reference station or in the computing center. The decentral configuration allows the estimation of state information on every reference station utilizing the observation of neighboring stations. Any combination of central or decentral concept is possible with RTK Freedom Network.

Real-Time or Postprocessing

Reference information is made available to the user through the following accepted international standardized interfaces:

• RTCM (Version 2.x or 3.x) for real-time applications
• RINEX for postprocessing applications

The additional information from the network processing is supplied as FKP or VRS.

GNSMART Applications:

• Extensive reference station networks for total coverage of an area
• Applications for providers of wide-area or linear infrastructure, including energy distribution, railways, roads, pipelines, etc.
• Surveying for wide-area or linear projects which exceed the range of RTK systems
• Hydrography and other precise positioning offshore
• Construction plant control for road building and utilities' networks
• Atmospheric science Weather forecast
• And many others

Click for complete documentation on Geo++ GNSMART