InSAR Critical Deformation Angle Measurement for Coal Mine Subsidence
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Solution Overview
Problem
Conventional methods for measuring the angle of critical deformation in coal mining areas suffer from low accuracy and inefficiency, making it difficult to monitor and predict surface movement and deformation in real time, thereby hindering effective prevention and handling of geological disasters.
Innovation Solution
An InSAR-based measurement method using small baseline subset interferometric synthetic aperture radar to acquire mining surface deformation images, perform two-dimensional decomposition, and calculate incline, curvature, and horizontal deformation parameters, combined with a probability integral method to determine critical deformation angles, utilizing a computer system for data analysis and visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional methods (leveling measurement, GPS, total station) are used to observe surface subsidence, then measurement data can be obtained, but the detection range is limited and the cost is high
Solution Approach 1:
The patent replaces conventional mechanical measurement systems (leveling measurement, GPS, total station) with InSAR technology. InSAR uses satellite-based radar interferometry to measure surface deformation, eliminating the need for complex ground-based measurement networks and expanding detection coverage to large areas without proportionally increasing system complexity
Solution Approach 2:
The patent creates a virtual copy of the ground surface deformation field through InSAR imaging. By generating synthetic aperture radar images that capture surface movement, the system can observe and measure deformation characteristics without physically being present at every measurement point, thus expanding detection range while maintaining measurement capability
2Area of stationary object
If D-InSAR technology is used to monitor subsidence, then large-scale deformation data can be obtained, but phase decorrelation occurs and continuous time-series data cannot be provided
Solution Approach 1:
The patent performs preliminary image calibration and coherence optimization before actual deformation measurement. By pre-processing the SAR images to ensure high coherence between adjacent images and establishing reliable phase relationships in advance, the system prevents phase decorrelation during subsequent time-series analysis, enabling continuous monitoring
Solution Approach 2:
The patent implements a feedback mechanism that continuously monitors the coherence quality of InSAR images during time-series analysis. When phase decorrelation is detected, the system automatically adjusts processing parameters or selects alternative image pairs to maintain data continuity, ensuring reliable long-term deformation monitoring
3Measurement precision
If conventional methods are used to calculate angle of critical deformation, then measurements can be obtained, but accuracy is low and efficiency is poor
Solution Approach 1:
The patent replaces conventional mechanical measurement and manual calculation methods with automated InSAR-based computational analysis. By using satellite imagery and digital signal processing algorithms, the system automatically extracts deformation characteristics and calculates critical deformation angles, significantly improving both accuracy and efficiency compared to traditional field measurement methods
Solution Approach 2:
The patent transitions from two-dimensional ground-based measurements to three-dimensional spatial deformation analysis. By incorporating vertical subsidence, horizontal displacement, and temporal evolution into a unified InSAR framework, the system achieves more accurate critical deformation angle calculation while processing data more efficiently through automated algorithms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method provides high-precision, efficient monitoring of surface deformation, enabling timely prediction and prevention of geological disasters by accurately determining critical deformation angles and boundaries.
Implementation Method 1
small baseline subset interferometric synthetic aperture radar
Implementation Method 2
synthetic aperture radar
Data Source
AI summary
The present invention discloses an InSAR-based measurement method and system for angle of critical deformation in a coal mining area, and relates to the technical field of geological disaster prevention and control of mountainous coal mines, comprising: acquiring a mining surface deformation field image using a small baseline subset interferometric synthetic aperture radar; and drawing profile lines along the strike direction and dip direction of the coal seam respectively in the mining surface deformation field image. The method provided by the present invention has the advantages of improving time resolution and reducing phase noise.