| 摘要 |
<p>Method and system for acquiring a graphical representation of one or more intersection points between a straight line and a surface (23) having a known location and orientation. Transmission from two or more aligned transmission points (12), being in any desired spatial orientation is received in a set of receivers (18). The transmission points (12) lie substantially along the straight line, and each transmission point (12) is separated from its neighboring point(s) (12) by a first fixed distance. The spatial coordinates of at least two transmission points (12) are determined by receiving signals transmitted from these transmission points (12) in the set of receivers (18), and processing the received signals. A at least one characteristic point (24) being colinear with the transmission points (12), and separated from at least one transmission point (12) by a second fixed distance, is determined. The spatial coordinates of this characteristic point (24) are calculated using the spatial coordinates of the two transmission points (12), and the second fixed distance, and the spatial representation of the surface (23) is determined andor calculated. Whenever the straight line and the surface (23) intersect, the spatial coordinates of the intersect point are calculated. A first graphical representation, indicating coincidence between the intersect point and the characteristic point (24), and a second and different graphical representation, indicating lack of coincidence, are displayed on a graphical representation of the surface (23).</p> |
