L和C波段雷达干涉数据矿区地面沉降监测能力分析

雷达成像的波长、入射角、地面分辨率等参数严重影响着SAR差分干涉测量地面沉降的监测能力和精度,论文通过理论推导和矿区实际沉降差分干涉相位模拟,从监测到的最大沉降梯度和沉降量、保相能力、对微小沉降的敏感程度等方面对L和 C波段雷达干涉数据的矿区地面沉降监测能力进行分析;精化双轨D-InSAR数据处理的流程、方法和相应参数,使用ALOS PALSAR和ENVISAT ASAR数据获取济宁某矿区2009年12月到2010年02月期间更为精确的矿区地面沉降结果,并对沉降结果进行详细比较和系统分析.理论推导、相位模拟和真实数据实验都表明,相对于C波段的雷达干涉数据而言,L波段雷达干涉数据具有较强的保相能力,能够更好地降低失相干和相位不连续性的影响,更容易监测到沉降梯度和沉降量较大的矿区地面沉降,但对微小矿区地面沉降的敏感程度较低.

Analysis of capabilities of L and C-band SAR data to monitor mining-induced subsidence

The wavelength, incidence angle and ground resolution and other radar imaging parameters seriously affect the capability and accuracy of SAR differential interferometric measurements to monitor land subsidence. A detailed comparative analysis of L and C-band SAR interferometric data to monitor mining-induced subsidence is implemented using theoretical derivation and differential interferometric phase simulation of the actual mining subsidence, including the largest monitored subsidence gradient and magnitude, phase maintaining capacity, sensitivity to minor subsidence and other properties. The data processing procedures and methods of two-pass D-InSAR are further refined to more accurately investigate subsidence magnitude, amount, distribution, area and other subsidence information of the coalfields of Jining in North China using ALOS PALSAR and ENVISAT ASAR image data during December 2009 to February 2010. And the monitored subsidence results of the study area are compared in detail and systematically. Theoretical derivation, simulated phase and data experimental results show that compared to the C-band ENVISAT ASAR, the L-land ALOS PALSAR data have a stronger phase maintaining capacity, can reduce the impact of decorrelation and phase discontinuity and are easier to monitor mining land subsidence with larger gradient and magnitude. However, it is less sensitive on the tiny mining land subsidence.