InSAR技术及其在沧州地面沉降监测中的应用

Monitoring land subsidence in Cangzhou region using InSAR technology

随着城市建设的飞速发展,地面沉降危害日益显著,常规的测量方法尽管精度高,但是成本高、采样精度低、测量时间周期长,已经无法满足当今社会的要求。合成孔径雷达干涉测量(InSAR)已成为测量地球表面变化极具潜力的技术,它可以大面积的采样、测量时间短,同时成本也很低。沧州地区至2001年沉降中心累计沉降量已达2236mm。文中介绍用合成孔径雷达干涉测量进行沧州地区地面沉降监测的试验,最后利用InSAR的差分技术得到的沧州地区的地面沉降监测结果,并据此得到一些初步认识。

With development of cities, damage due to land subsidence becomes more and more severe. Although routine measures for determining subsidence have higher accuracy, their costs are very high, their sample density is very low, and their intervals between determinations are very long. Accordingly, routine techniques can- not satisfy the demands of modern society. Interferometric Synthetic Aperture Radar （InSAR） has become the technique in their place, with the most potential. It can sample densely, measure land subsidence in short intervals, and its cost is cheaper. For example, in the region of Cangzhou, land subsidence had amounted up to 2 236 mm in 2001. This paper introduces the essential principles of Interferometric Synthetic Aperture Radar （InSAR） and the processing of InSAR data. In addition, it reports an experimental InSAR land subsidence study in the Cangzhou region. Results of the Cangzhou region study are reported and the utility of the InSAR methodology is discussed.