GNSS RTK Networks and Their Benefits
If it is required to monitor any movements within a network, it is also possible to arrange for the positions of the antennas to be computed automatically at regular intervals.
A Case Study of GNSS Reference Station Network in Bahrain
This section of paper studies a practical example of a Network of GNSS reference stations which would cover the whole Geographical Area of Kingdom of Bahrain. The system is built around Leica Spidernet GNSS reference station software, Leica GRX Pro 1200 GNSS receivers, CISCO Routers and T1/E1 ISDN telephony solution from Batelco. The purpose of this network is to provide RTK corrections to all registered users to achieve 1 cm level accuracy in position and 2 cms in height throughout the Kingdom and use it for land registry and titling purpose.
Site Server Component
Site server application in Spider Net is responsible for managing and controlling Individual GPS reference station site including single base RTK transmission from these sites. The functionality included in site server component is listed below:
- Site Map: Gives you a graphical overview of the status and configuration of all the sites belonging to your server.
- Site: Create, edit, view and delete such sites. Start and stop logging and RTK transmission.
- Sensor: Configure sensor settings, such as logging, RTK, meteorological and tilt sensors, and upload them to the sensor. Start and stop logging and RTK transmission.
- Raw Data Status: View the real time connection status of the configured sites.
- File Products: Define the creation of data files, e.g. RINEX, Leica MDB files, Leica QC (quality check) files and event logs.
- RT Products: Create real time correction streams for RTK rovers.
- Positioning Products: Create baselines for real time positioning between two sites.
Network Server Component
The Network Server Component in Spider Net is responsible for getting the data streams from the individual reference station sites via Site Server and compute the network correction by assigning sites to Cluster Server and forming the cells (as per the Master Auxiliary Approach of RTCM 3.0) or by Automatic Cells using the Rover NMEA positions. Some the main components are given below:
- Net Configuration: Provides an interface to configure all settings related to network processing and output of network RTK corrections. Here administrator can assign the Site Servers to the network and then these sites can be assigned to Cluster Servers and configuration of cells.
- RT Products: Enables network correction information, individualized network corrections and single site RTK corrections to be transmitted to users in the field using any of the supported communication media.
- Map View: Provides location based information of all rover user on the network server
- Rover Status: Provides a list of all rover user on the network server and also in the map view. You can disconnect a user with just a mouse click.
- Sat Status: Displays the cluster (NAL) status for each satellite and each site.