Moving Object Imaging with Doppler-Aware Scattering Functions
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Solution Overview
Problem
Imaging a moving object in a measurement area using measurement data of scattered waves is challenging due to the Doppler effect, which complicates the analysis of wave properties and makes it difficult to achieve high accuracy.
Innovation Solution
An imaging device that includes a plurality of transmitters and receivers, along with an information processing circuit, derives a scattering field function and an imaging function that account for the Doppler effect by using the velocity vector of the object, allowing for accurate imaging by reflecting the change in wavenumber of the scattered wave.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging methods using scattered waves are applied to moving objects, then the imaging process becomes complex due to the Doppler effect, but imaging accuracy deteriorates
Solution Approach 1:
The patent changes the parameter representation by introducing a velocity vector parameter to characterize object motion. The scattering field function is reformulated to include velocity-dependent terms, transforming the problem from analyzing complex time-varying wave patterns to evaluating a structured function with explicit velocity parameters, thereby improving imaging accuracy while managing complexity
Solution Approach 2:
The patent introduces an intermediary scattering field function that mediates between the raw scattered wave measurements and the final image reconstruction. This function incorporates Doppler effect corrections through velocity vector integration, serving as an intermediate processing step that simplifies the overall imaging algorithm while maintaining high accuracy
2Measurement precision
If the Doppler effect is ignored in scattered wave analysis, then the analysis process is simpler, but imaging accuracy of moving objects deteriorates
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing the scattering field function for various velocity vectors before actual imaging. This preprocessing step creates a lookup table or pre-computed database that can be quickly referenced during imaging, reducing real-time processing time while maintaining accuracy through proper Doppler compensation
3Reliability
If traditional inverse problem methods are used for moving objects, then the mathematical formulation remains the same, but solution reliability deteriorates due to Doppler-induced phase errors
Solution Approach 1:
The patent applies dynamics by making the scattering field function explicitly dependent on the velocity vector of the object. Instead of using static imaging formulations, the algorithm dynamically adjusts the field function parameters based on measured or estimated object velocity, thereby compensating for Doppler-induced phase errors and improving solution reliability for moving targets
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 device enables high-accuracy imaging of moving objects by deriving scattering and imaging functions that account for the Doppler effect, thereby improving the precision of object imaging in the measurement area.
Implementation Method 1
a plurality of transmitters 101 that respectively transmit a wave to a measurement area; a plurality of receivers 102 that respectively receive a scattered wave of the wave from the measurement area
Implementation Method 2
the Doppler effect causes a difference between the properties of waves transmitted to the measurement area and the properties of scattered waves received from the measurement area
Data Source
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AI summary
An imaging device (100) includes: a plurality of transmitters (101) that each transmit a wave to a measurement area; a plurality of receivers (102) that each receive a scattered wave of the wave from the measurement area; and an information processing circuit (103) that images an object in the measurement area using measurement data of the scattered wave. The information processing circuit (103): derives a scattering field function using the measurement data and a velocity vector of the object; derives an imaging function that is defined using an amount output from the scattering field function in response to inputting an imaging target position into the scattering field function; and images the object in the measurement area using the imaging function. The information processing circuit (103) reflects in the scattering field function that the wavenumber of the scattered wave changes due to the Doppler effect corresponding to the velocity vector.