Abstract

The Continuously Operating Reference Stations network for NSW (CORSnet-NSW) is a modern positioning infrastructure continuously broadcasting GNSS data. Many networks like this have been developed throughout the world. Having a CORS system enables a user to obtain higher quality coordinates without the need to buy a second GNSS unit. The expanding CORSnet-NSW network, previously known as Sydnet, now boasts Differential GNSS (DGNSS) coverage to 99.5% of NSW’s population.

CORSnet-NSW now offer both single and network DGNSS solutions (that is code only differential GPS/GLONASS) with an advised maximum distance of 150 km from the CORSnet reference station. DGNSS Real-Time allows for DGNSS data streams at 1 second intervals with achievable horizontal accuracies at the sub-metre level. Radio Technical Commission for Maritime Services (RTCM) data streams containing both GPS and GLONASS are sent to any registered user compliant with RTCM version 2.3.

The difference between CORSnet-NSW observed positions and SCIMS position was computed using single reference stations at varying distances as well as network solutions. Comparisons were made as the distance between the rover and the single reference station increased to determine whether there are any differences in accuracy and precision. The results show near to no sign of any degradation in quality as the distances between the two increased. The results indicate a higher quality of both precision and accuracy when obtaining a network solution over that of a single reference station.

Aim

The aim of this thesis is to investigate two features of the CORSnet-NSW real time DGPS service. Firstly, the impact on accuracy and precision of both 2D and 3D results as the distance between the rover and the reference station increases. To measure these results a single rover will be set up on a known SCIMS coordinate and receive data from a selected list from any of the 69 CORSnet-NSW reference stations. Secondly, a comparison will be made between the accuracy and precision of NDGNSS service and the single base DGNS service. The data will be logged every second for 250 seconds in order to investigate any trends apparent in the results.

 
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