南极航空地球物理调查GPS数据后处理方法试验

监测和预测冰盖的行为和演化趋势对于研究未来全球气候及海平面变化具有重要的科学意义。地球物理探测成为极地现场考察中最重要的技术手段并取得巨大成功,而航空地球物理的独特优势成为极地科考最有发展潜力的研究方向。经过多年努力,中国成为第4个拥有极地航空地球物理科学考察能力的国家,并在中国第32次南极考察期间完成东南极伊丽莎白公主地(PEL)数千平方千米的航空地球物理探测任务。对于航空地球物理勘探而言,航空测点定位是首要而基础性的工作,本文针对航空地球物理测量中GPS定位数据后处理工作目标,通过一系列的方法和软件对比试验,评价GPS后处理精度误差和应用效果,在试验基础上开发相应的软件完成GPS数据和各地球物理方法数据的匹配连接,进而总结极地航空地球物理GPS数据后处理工作流程,形成实用化的极地航空地球物理GPS数据后处理方案,对后续工作具有指导意义。

Experiments on post-processing of GPS data in airborne geophysical exploration of Antarctica

It is important to both monitor and predict the behaviors and evolutionary trends of ice sheets in relation to future changes of climate and sea level. Geophysics has particular importance in scientific polar exploration, and the unique advantages provided by airborne geophysical surveys make it an active and promising field of research. China has become the fourth country with a polar airborne geophysical platform, and it has surveyed thousands of square kilometers area of Princess Elizabeth Land, East Antarctica. The objective of this study was to undertake post-processing of GPS data, and to evaluate the accuracy of precise point positioning through comparison experiments. Based on the results of the experiments, we developed software for matching and linking GPS and geophysical data. Then, we summarized a workflow procedure for GPS data processing and we formulated a practical scheme for the post-processing of GPS data acquired during a polar airborne geophysical expedition. The findings of this study can be considered a guiding reference for future related work.