| 摘要 |
<p>The invention relates to horizontal directional drilling systems (14), in particularly guidance systems therefore. Such guidance systems, according to the invention comprise at least one of the sensors: fiber optic gyroscope (18,20,21), ring laser gyroscope, micro-electromechanical system and rate sensor (25). A microcontroller (9) is present for receiving and processing data from sensors at the drill head. The microcontroller (9) comprises neural fuzzy control logic for processing the data from the sensors at the drill head. Data from the microcontroller are sent to a surface based computer via radio-waves. The user interface in the computer (4) displays azimuth, tilt, and inclination angles of the drill head on the display device. The use of fiber optic gyroscopes and ring laser gyroscopes allows the display of true North and actual and desired tracks on the display device. Means are present for determining a reliability figure for data dependent on integrated signals from rate sensors and such reliability figures are displayed on the display device. <IMAGE></p> |
