Using Network RTK Systems.
Network RTK solutions for use with GPS Surveying Equipment in Britain have been around since Leica launched their Spider Net back in 2006. Since then Trimble (VRS System) and most recently Topcon with their Topcon TopNET service have entered the market of Network RTK Systems.
The main advantage of the using the Network RTK systems is the amount of time saving that can be achieved. There is no need to set up a base station (potentially leaving it vulnerable too) and the co-ordinates are to OS Co-ordinates too.
Getting the Best Results.
But how do you get the best results when using the Network RTK Solutions like Topcons TopNET Service with the Topcon GRS-1
- When setting control stations (ie precise work) you should be observing the control station points for at least 3 minutes. This should be repeated again for another 3 minutes at least 20 minutes later. Increasing the gap between the 3 minute observations to around 45 minutes will yield more accurate results. Trying to increase this gap beyond 45 minutes will increase the accuracy further however the gains are minimal after 45 minutes.
- For Topographical Surveying it is advisable to observe points for a 5 second interval. This is so that the potential for individual co-ordinate variations are kept to a minimum.
- Typically accuracies using the Network RTK solutions are around 10-20mm in plan and 15-30 mm in height.
- When surveying at close to the limits of the Network RTK solution coverage greater care should be taken as there is a greater possibility that the solutions may deviate from the expected performance.
You should also always ensure that your GPS Rover is correctly configured. If you are in any doubt about the configuration of your system you should contact your Surveying Equipment Supplier.