不同GNSS时段对车载激光扫描影响的实验研究

Experimental Research on the Effects of Different GNSS Sessions in Vehicle-borne Laser Scanning

开展了对同一环境在同一天不同GNSS时段的车载激光扫描实验,通过数据分析研究得到了不同GNSS时段对车载激光扫描的影响程度。结果表明,在树木、建筑物遮挡严重的GNSS信号较弱区域,车载激光扫描需考虑不同GNSS时段的影响;在视野开阔的GNSS信号良好区域,则无需考虑GNSS时段的影响。因此,需要通过卫星星历预报软件或平台提前预知计划作业区域和日期在不同GNSS时段的信号优劣,从而合理规划扫描作业时间,以提高扫描数据的可靠性,对于车载激光扫描作业具有很强的参考意义,值得推广应用。

Through the vehicle-borne laser scanning data in different GNSS sessions on the same day for the same environment,we analyzed and studied the effects of different GNSS sessions in vehicle-borne laser scanning.The result shows that the effects of different GNSS sessions need to be considered if in a poor GNSS signal area blocked by trees and buildings,while the effects of different GNSS sessions don’t need to be considered if in an area with good GNSS signal.We can predict the GNSS signal quality in different sessions of an area in advance to plan the scanning operation time and improve data reliability through satellite ephemeris prediction software or platform.It is of great reference significance and worth promoting for vehicle-borne laser scanning.