IGI - Integrated Geospatial Innovations

  • Holding GPS Position Not a Dead Option

    RailMapper

    Dead reckoning has been used by aviators, marine vessels and surveyors as a navigation solution for centuries. This process of estimating a position by advancing a known position using course, speed, time and distance to be traveled can be a valuable tool when GPS is an issue. But, alone it is prone to error. As the saying goes "You're dead, if you don't reckon right." Enter technology. Terrestrial Mobile LiDAR Scanning (TMLS) where advancements in GPS satellite navigation and inertial navigation systems provide accurate positioning it is still on the basis of the surveyor's dead reckoning. Dead reckoning implies estimation and inaccuracy; however the concept is a sound process when coupled with well control TMLS technology. Dead reckoning, using the roll, pitch and yaw data from the IMU (inertial measurement unit), aids traditional GPS navigation via intelligent algorithms based on a vehicle's distance and directional changes during GPS signal interruption. When there is no GPS, the system relies on the IMU and DMI (distance measuring instrument) for short periods of time...

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