NovAtel's Annual Journal of GNSS Technology Solutions and Innovation

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Page 32 of 51

GNSS-Aided Mining ing in a direct path from one position to the next, which minimizes stress on moving components of the drill machinery. GNSS on Drills Precise positioning and heading are fundamental to successful drilling. NovAtel's Advance® RTK positioning (centimetre-level– Figure 3) is used for positioning of the drill, and its ALIGN® (0.3 degree, 95% for a 3-4 metre antenna separation) for drill heading and measured offsets from the antennas to the drill steel (Figure 4). Heading accuracy is critical, as distance from antennas to drill steel is typically two to three times the distance between the antennas. Generally, every 0.1 degrees of heading error results in 1.75 centimetre of error in the drill steel. Flanders normally uses NovAtel's DL-V3™ high-performance GNSS receiver as the RTK base station to broadcast corrections to the drill-mounted ProPak™-V3s. Typical reference station-to-equipment baselines for real-time kinematic GNSS operations in a mine are 2–10 kilometres or 1.6 to 6 miles. Both types of NovAtel receivers are "off-theshelf" products that incorporate NovAtel's OEMV-3 receiver board. In some cases, a customer's existing base station is used. The solution's precision positioning system includes a single "full feature" ProPak to provide the RTK position and a "heading" Figure 3: RTK horizontal coordinates recorded during the drilling of four holes; real-time data recorded on an operational drill. For more Solutions visit http:/ / 2013 velocity 33

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