|Differential GPS (DGPS) is the first ever tagging and hole identification method using Differential Global Position System.
High Accuracy DGPS (Differential Global Positioning System)
The DGPS is a high accuracy (sub 3.28 feet / one meter), new addition to the CE4 Commander blasting system. The market leading CE4 Commander system has been further enhanced with the DGPS technology to accurately detect blast hole positions.
High accuracy differential GPS will revolutionize the deployment and tagging of the 4G detonators for surface mining. Potential human error with regards to incorrect blast hole identification or incorrect delay assignment is practically eliminated.
What is the difference between regular GPS and Differential GPS?
GPS technology uses standalone receivers where the location is directly calculated but is also prone to errors such as satellite orbit errors, multi-path errors and clock errors. As a result, GPS can gain a nominal accuracy of 32 – 50 feet (10 – 15 meters).
Therefore, normal GPS accuracy is not suitable for blast hole positioning. This is why Detnet has developed a user-friendly Differential-GPS (DGPS) system which is fully integrated with the CE4 Tagger and Commander system. The system provides sub one-meter accuracy for accurate blast hole tagging/logging.
The accuracy in DGPS is achieved by using a reference receiver (Commander) at a known (surveyed location) position that broadcast correction data to one or more rovers (Taggers). The rovers then adjust their ‘perception’ of where they are using the correction data from the reference station.
With using DGPS in “plan mode”, drill rig blast hole GPS coordinates is transferred to ViewShot 3D to do the final blast design timing sequence. The blast plan & timing sequence is then downloaded onto the DGPS tagger ready for tagging on the bench in “Plan Mode”.
Alternatively, if drill rigs are not equipped with GPS accurate blast hole coordinates can now be logged by the DGPS tagger on the bench and then be transferred to the ViewShot 3D to provide for an accurate layout of the blast hole positions used in the blast design.
Future application of this technology*
Dyno Nobel continues to strive towards excellence in electronic initiation. As a world leader in our field, we aim to deliver world-class safety, the latest technology and consistent quality; resulting in improved loading and fragmentation, to ensure mining becomes more sustainable today and into the future.
*This technology is in the design/development phase and currently not available to end users.