Topcon Positioning Systems announced Lazer Zone, a new technology that can be combined with any Topcon RTK GPS system to generate a vertical accuracy to within a few millimeters. Lazer Zone technology incorporates a zone-beam laser transmitter, the PZL-1, that sweeps a 2,000-foot diameter (600 m) area with a 30-foot (10 m) high wall of a unique measuring laser sensor. A compact sensing unit, the PZS-1, is fitted over the top of the range pole. When the PZS-1 sensing unit is combined with a GPS rover, the system will deliver RTK GPS horizontal measuring precision along with milli-meter vertical measuring precision. This combined system, Millimeter GPS, allows multiple GPS rovers to be used simultaneously with a single Lazer Zone transmitter with the vertical accuracy of an optical or robotic instrument, without the restriction of one base instrument with one rover.
Source: Topcon, April 2004