总结和分析了地表形变D-InSAR监测的主要方法和当前所面临的主要问题。针对常规D-InSAR技术中大气相位和低相干区域相位解缠,分别介绍了基于Delaunay三角网的不规则格网解缠方法、累积干涉纹图处理方法(Stack ing Interferogram s)、永...总结和分析了地表形变D-InSAR监测的主要方法和当前所面临的主要问题。针对常规D-InSAR技术中大气相位和低相干区域相位解缠,分别介绍了基于Delaunay三角网的不规则格网解缠方法、累积干涉纹图处理方法(Stack ing Interferogram s)、永久性散射体(PS)技术以及角反射器干涉测量(CR-InSAR)方法,分析了各自的适用条件和优缺点。此外,对有限数据量条件下低相干区域大气相位校正和相干目标识别等问题进行了重点讨论。立足于工程应用需要,分别对D-InSAR测量地表形变的参数要求、测量结果的精度验证、D-InSAR测量值与形变的关系、大区域处理以及形变场时空演变等问题进行了分析和讨论。展开更多
Abstract With low-lifting capability taken into account, a robust guidance law for Mars entry vehicles with low lift-l：o-drag ratios, such as Mars Science Laboratory （MSL）, is presented. Consider the nonlinear term...Abstract With low-lifting capability taken into account, a robust guidance law for Mars entry vehicles with low lift-l：o-drag ratios, such as Mars Science Laboratory （MSL）, is presented. Consider the nonlinear term in the drag dynamic equation and bounded disturbances as a lumped disturbance, and design a linear disturbance observer （DOB） to estimate it. With the consideration of the control input saturation, an innovative sliding surface and a virtual system are introduced to design the guidance law. Analyses of disturbance observer performance and Lyapunov-based transient performance are also presented. It is shown explicit choices of design parameters. Simulation guidance law. that the drag tracking error can be adjustable by results confirm the effectiveness of the proposed展开更多
文摘总结和分析了地表形变D-InSAR监测的主要方法和当前所面临的主要问题。针对常规D-InSAR技术中大气相位和低相干区域相位解缠,分别介绍了基于Delaunay三角网的不规则格网解缠方法、累积干涉纹图处理方法(Stack ing Interferogram s)、永久性散射体(PS)技术以及角反射器干涉测量(CR-InSAR)方法,分析了各自的适用条件和优缺点。此外,对有限数据量条件下低相干区域大气相位校正和相干目标识别等问题进行了重点讨论。立足于工程应用需要,分别对D-InSAR测量地表形变的参数要求、测量结果的精度验证、D-InSAR测量值与形变的关系、大区域处理以及形变场时空演变等问题进行了分析和讨论。
基金co-supported by the National Basic Research Program of China(No.2012CB720000)the National Natural Science Foundation of China(No.61174201)
文摘Abstract With low-lifting capability taken into account, a robust guidance law for Mars entry vehicles with low lift-l：o-drag ratios, such as Mars Science Laboratory （MSL）, is presented. Consider the nonlinear term in the drag dynamic equation and bounded disturbances as a lumped disturbance, and design a linear disturbance observer （DOB） to estimate it. With the consideration of the control input saturation, an innovative sliding surface and a virtual system are introduced to design the guidance law. Analyses of disturbance observer performance and Lyapunov-based transient performance are also presented. It is shown explicit choices of design parameters. Simulation guidance law. that the drag tracking error can be adjustable by results confirm the effectiveness of the proposed
