Microclimate Radar Interferometry Atmospheric Correction
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Solution Overview
Problem
Ground-based radar interferometry measurements suffer from errors due to varying atmospheric conditions, which affect the speed of radar waves and introduce inaccuracies in monitoring surface movements.
Innovation Solution
Identifying microclimates across a surface and using sensors to determine atmospheric conditions within each microclimate, allowing for atmospheric corrections to be applied to radar interferometry measurements, thereby reducing errors and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ground based radar interferometry measurements are performed across a surface, then surface movement monitoring is achieved, but measurement accuracy deteriorates due to atmospheric conditions affecting radar wave speed
Solution Approach 1:
The patent divides the measurement surface into multiple micro-climates with distinct atmospheric characteristics. Sensors are deployed within each micro-climate to capture local atmospheric conditions (temperature, pressure, humidity). This local measurement approach allows for spatially varying atmospheric corrections to be applied to different portions of the radar interferometry measurements, thereby maintaining measurement accuracy across heterogeneous atmospheric conditions.
Solution Approach 2:
The patent introduces atmospheric sensors as intermediary devices that measure atmospheric conditions within each micro-climate. These sensors act as mediators between the radar system and the atmosphere, providing data about the medium through which radar waves propagate. The atmospheric correction values derived from sensor measurements serve as intermediaries to compensate for atmospheric effects on radar wave speed, thereby improving measurement accuracy.
2Measurement precision
If atmospheric corrections are determined for each micro climate, then measurement accuracy is improved, but device complexity increases due to multiple sensors and correction calculations
Solution Approach 1:
The patent segments the measurement area into discrete micro-climates, each with its own atmospheric characteristics. This segmentation allows the complex problem of atmospheric correction over a large heterogeneous area to be divided into multiple simpler sub-problems, where each micro-climate can be characterized and corrected independently using local sensor data.
Solution Approach 2:
The patent changes the approach from using a single uniform atmospheric correction value for the entire measurement area to using multiple spatially varying correction values corresponding to different micro-climates. This parameter change from global to local correction values allows the system to adapt to varying atmospheric conditions across the measurement surface, improving accuracy while managing complexity through systematic organization.
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
This approach enhances the accuracy and reliability of radar interferometry measurements by accounting for varying atmospheric conditions, providing more precise estimates of radar wave speed and reducing measurement errors.
Implementation Method 1
One source of error in radar interferometry measurements is the delay of radar waves propagating through air. In a vacuum, the waves travel at the speed of light, but in the air, the waves travel at a speed less than the speed of light. The speed in air is dependent on atmospheric conditions (e.g., temperature, pressure, humidity).
Data Source
AI summary
A method for monitoring movement of a surface using ground based radar interferometry measurements includes identifying micro climates on the surface and determining boundaries of the micro climates on the surface. One or more first sensors are arranged at a measurement site for measuring first atmospheric conditions at the measurement site. One or more additional sensors are arranged in each of the micro climates for measuring atmospheric conditions in the micro climates. An atmospheric correction is determined for each of the micro climates. The atmospheric correction for each micro climate is based on the first atmospheric conditions at the measurement site and the atmospheric conditions at the micro climate. The ground based radar interferometry measurements are performed across the surface, and the ground based radar interferometry measurements within the boundary of each micro climate are corrected using the atmospheric correction for the micro climate.