| 摘要 |
<p>Methods and apparatus are provided for measuring distance from an instrument origin to each of a plurality of points in an environment. Laser pulses are emitted along a measurement axis at successive displacements about the origin. The emission time of each pulse is time-shifted relative to a fixed rate. The time shift corresponds to an index (1430) of a repetitive sequential pattern. Received pulses are detected at respective arrival times. For each received pulse: a current apparent distance (1410) is determined, a measured delta distance (1425) is calculated, a range interval (interval 0, interval 1, ..., interval n) is assigned by comparing the measured delta distance (1425) with an expected delta distance (1435, 1455, 1475) synchronized with the index (1430) of the latest emitted pulse, the current apparent distance (1410) is defined to be a true measured distance for any received pulse assigned to a first time interval (interval 0), otherwise the current apparent distance (1410) is defined to be a false measured distance. The false measured distance may be corrected to obtain a true measured distance by adjusting for the corresponding time shift and adding an offset corresponding to the assigned range interval (interval 1, ..., interval n).</p> |
