A Web-Based Real-Time Monitoring System for GNSS Data Quality and Integrity

The single base real-time kinematic (RTK) positioning technique is distance-dependent in terms of accuracy and reliability of the integer ambiguity resolution. The Network RTK (NRTK) technique has been developed to overcome this limitation, so is able to be used over longer distances than is possible with single base RTK whilst maintaining centimetre-level accuracy. This multiple reference station approach provides a precise measurement correction to the RTK positions over long baselines by interpolating errors across the reference receiver network. In order to provide reliable corrections it is necessary for the NRTK service provider to have quality and integrity monitoring mechanisms.