HORIZONTAL DIRECTIONAL DRILLING SYSTEM INCLUDING SONDE POSITION DETECTION USING GLOBAL POSITIONING SYSTEMS

摘要

A locator system (104) for determining a location of a drill head, comprising: a locating device (222) including a global positioning system (GPS) configured to determine a location of a sonde (108) associated with a drill head; characterized by a controller (202) configured to: receive a first location (912) of the sonde as deteremined by the locating device; receive a second location (912') of the sonde subsequent to the first location as determined by the locating device; refine the second location based on known information associated with the drill head (914, 1008); and refine the first location based on the refined second location and the known information associated with the drill head.