InSAR-based Measurement Method for Angle of Critical Deformation in Coal Mining Area and System

An InSAR-based measurement method for angle of critical deformation in a coal mining area, comprising:

• acquiring a mining surface deformation field image using a small baseline subset interferometric synthetic aperture radar;
• drawing profile lines along the strike direction and dip direction of the coal seam respectively in the mining surface deformation field image, and selecting n target deformation points as monitoring points on the profile lines respectively;
• carrying out two-dimensional decomposition ignoring north-south directional deformation contribution on monitoring point data according to satellite incidence angles and satellite fly directions and azimuth angles, so as to obtain vertical and horizontal deformation values;
• calculating incline, curvature and horizontal deformation parameters with the combination of vertical and horizontal deformation results of two-dimensional decomposition according to a probability integral method;
• and
• drawing a curve chart according to vertical deformation of a target area and parameters above, and acquiring a corresponding angle of critical deformation value in a study scope within 10 mm of vertical deformation with strike and dip profile maps.