SAR Displacement Estimation and Clipping for Flat Surfaces
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Solution Overview
Problem
Current synthetic aperture radar (SAR) systems struggle to accurately measure ground surface displacement over flat surfaces like roads due to weak backscattering, leading to incomplete data and privacy concerns when attempting to output displacement information.
Innovation Solution
A displacement output system that acquires ground surface displacement from SAR, estimates missing values using interpolation or extrapolation, clips data within predefined regions, and outputs only the relevant displacement information to avoid sensitive areas, ensuring complete data coverage while protecting privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SAR measures ground surface displacement using persistent scatterer points, then measurement precision is improved, but flat surfaces like roads cannot be measured due to weak backscattering
Solution Approach 1:
The patent introduces an intermediary estimation process that uses measured displacement values from surrounding points to calculate displacement at points where direct measurement is not possible. This intermediary calculation enables the system to provide displacement data for flat surfaces like roads by inferring values from adjacent measurable areas, thus resolving the limitation of weak backscattering on such surfaces.
2Loss of information
If the system outputs ground surface displacement data, then information completeness is improved, but privacy concerns arise in predetermined regions
Solution Approach 1:
The patent extracts and removes displacement data from predetermined regions where privacy protection is required. By selectively excluding data from these specific areas while maintaining data output for other regions, the system achieves a balance between information completeness and privacy protection, allowing useful displacement information to be provided without exposing sensitive locations.
3Loss of information
If the system estimates displacement at points where measurement is not possible, then data coverage is improved, but reliability of estimated values may be reduced
Solution Approach 1:
The patent applies local quality by providing different types of data with different reliability characteristics for different locations. Measured values from persistent scatterer points maintain high reliability, while estimated values at flat surfaces provide acceptable data coverage with understood limitations. This differentiated approach allows the system to maximize data coverage while maintaining appropriate reliability expectations for each data type.
Data Source
AI summary
A displacement output device according to the present invention includes: a memory; and at least one processor coupled to the memory. The processor performing operations. The operations include: acquiring a first ground surface displacement at a first point from a synthetic aperture radar; estimating a second ground surface displacement at a second point different from the first point using the acquired first ground surface displacement; clipping at least one of the first ground surface displacement and the second ground surface displacement included in a preset first region from the first ground surface displacement and the second ground surface displacement; and outputting at least one of the first ground surface displacement and the second ground surface displacement included in the first region.