GNSMART is based on the procedures known as GNSS-SMART (Global Navigation Satellite System – State Monitoring And Representation Technique).

With any GNSS (currently GPS or GLONASS), high resolution observations are made, but in practice these are still affected by numerous sources of error (satellite orbit errors, ionospheric and tropospheric effects). The complete system including its error sources can always be considered to be in a dynamic state. GNSS-SMART comprises the monitoring of the state of the whole system including regional atmospheric effects, together with its presentation and delivery to the user for the purpose of position determination with the highest accuracy, reliability and availability, both in real-time and by post-processing.


From the user’s point of view, in contrast to conventional procedures, no knowledge of the internal structure of the GNSMART system is necessary. By means of the reference data supplied by GNSMART, the user receives observations free of systematic errors, which enable him to determine absolute positions with a homogeneous and high standard of accuracy using a single mobile instrument. Thus it is possible for the first time to make very accurate measurements in relation to a high order reference frame without local connecting observations.

The Practical Realization GNSMART

GNSMART is the Geo++ realization of GNSS-SMART. It contains all necessary software components for the monitoring and representation of the system state of GPS and GLONASS. Monitoring is achieved by means of reference stations (monitoring stations) which, with a spacing of 50 km or more, can provide complete coverage of reference data to enable position fixing with centimeter accuracy in real-time.

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