融合三次样条插值的D-InSAR沉陷变形监测技术

传统煤矿开采沉陷形变监测只能获得离散监测点的地表形变量,无法获取沉陷区整体的形变趋势,而D-InSAR技术能够获取整体地表形变信息,但D-InSAR技术需要大量遥感影像数据,否则导致时间失相干性而无法获得连续的形变量。本文针对DInSAR影像数据解译过程中影像数据较少的问题,首先利用D-InSAR技术对淮北矿业集团袁店二矿7225、7226工作面进行了监测分析,获取了几个时间段内整体的下沉形变场;然后提出了采用三次样条插值与D-InSAR技术相结合的开采沉陷监测方法,基于D-InSAR影像上监测点监测值,利用三次样条插值建立了内插反演函数,在已建立函数的基础上得出了其他雷达卫星重访周期内的下沉值;最后将内插反演下沉值与实测水准数据进行了对比分析。结果表明:D-InSAR监测结果能够有效地反映开采沉陷的影响范围,能够较为准确地提取区域地表的形变信息;结合三次样条插值的D-InSAR技术监测结果最大误差和最大相对误差分别为31.5 mm和17%,该方法能有效地解决D-InSAR影像数据缺少的问题。

D-InSAR Deformation Monitoring Technology Based on Cubic Spline Interpolation

Traditional coal mining subsidence deformation monitoring can only obtain the surface shape of the discrete monitoring variables,unable to get deformation trend of subsidence area as a whole,while the D-InSAR technique can obtain the overall surface deformation information.But D-InSAR technique requires a large number of remote sensing image data,otherwise it will lead to loss of coherence time and won' t be able to obtain continuous variables.Based on D-InSAR image data interpretation in the process of image data with fewer problems,this paper first using the D-InSAR technology yuen shop two mine of huaibei mining industry group in 7225, 7226 working face monitoring analysis, obtained several period subsidence deformation field of the whole, and then put forward combined cubic spline interpolation with D-InSAR technique mining subsidence monitoring method, based on D-InSAR imaging of monitoring value on monitoring,using the cubic spline interpolation to establish interpolation inverse function, the function has been established on the basis of other radar satellite revisit cycle sinking value.Finally the interpolation inversion subsidence value and the measured level data were analyzed.The results show that D-InSAR technique can effectively reflect the influence range of mining subsidence,and can extract the deformation information of regional surface accurately.Combining with the cubic spline interpolation of D-InSAR technology monitoring results maximum error and the maximum relative error is 31.5 mm and 17%respectively.The method can effectively solve the problem of the lack of D-InSAR imaging data.