SAR Signal Processing Using 3D Steady-State Image Reconstruction
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Solution Overview
Problem
Existing technologies fail to correctly detect changes from a steady state in SAR images due to variations in imaging conditions, leading to false detections and inability to generate a complex image showing the steady state suitable for SAR image analysis, particularly in urban areas with height differences and layover phenomena.
Innovation Solution
A signal processing system and method that generates a simulated SAR image using three-dimensional information on intensity and phase, reconstructing a steady state suitable for the imaging conditions of the SAR image to be analyzed, allowing for accurate change detection by correlating phase information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simulated SAR image is generated using three-dimensional information reconstructed from observed SAR images, then the accuracy of change detection is improved, but the device complexity and processing time increase
Solution Approach 1:
The patent performs preliminary reconstruction of three-dimensional information from observed SAR images before generating the simulated SAR image. This preliminary action creates a steady-state reference model that can be reused for multiple change detection operations, improving accuracy while managing complexity through pre-processing.
Solution Approach 2:
The patent introduces three-dimensional information as an intermediary between observed SAR images and the simulated SAR image. This intermediary representation captures the steady-state characteristics in a form that can be transformed into different imaging conditions, enabling accurate change detection without directly comparing complex raw images.
2Reliability
If three-dimensional information is reconstructed using observed SAR images to generate a simulated SAR image, then the reliability of steady state representation is improved, but the loss of time in processing increases
Solution Approach 1:
The reconstruction of three-dimensional information is performed as a preliminary step that captures the steady-state characteristics once, which can then be reused for generating simulated images under different imaging conditions. This reduces repeated processing time while maintaining reliability.
Solution Approach 2:
The patent creates a simulated SAR image as a copy or representation of the steady state based on reconstructed three-dimensional information. This simulated image serves as a reference model that can be generated quickly once the three-dimensional reconstruction is complete, reducing processing time for multiple comparisons.
3Measurement precision
If phase information is incorporated into the SAR image analysis, then the measurement precision of change detection is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The patent uses three-dimensional information as an intermediary that simplifies the handling of phase information. By reconstructing the steady state in three-dimensional space with phase components, the system avoids directly processing complex phase data in the image domain, reducing measurement difficulty while maintaining precision.
Solution Approach 2:
The patent replaces direct mechanical comparison of complex SAR image phases with a transformation-based approach using three-dimensional information. This substitution converts the difficult phase comparison problem into a more manageable simulation and correlation process in the three-dimensional representation space.
Data Source
AI summary
The signal processing system 20 includes generation means 21 which generates a simulated SAR image, which is a complex image showing a steady state suitable for an imaging condition of a SAR image to be analyzed using a three-dimensional information, which is data with information on an intensity and a phase at a three dimensional position under the steady state reconstructed using an observed SAR image of an area taken by a SAR and the imaging condition of the SAR image to be analyzed.