Radar Image Phase Rotation to Suppress Reflected-Signal Overlap
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Solution Overview
Problem
Radar image processing devices struggle to suppress reflected signals with non-zero phase differences between different radio wave receiving points, leading to overlapping signals in a pixel.
Innovation Solution
A radar image processing device that calculates phase shift components and phase differences between radar images, rotates pixel phases based on calculated amounts, and computes differences between corresponding pixel values to suppress unwanted signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase difference calculation is performed between radar images taken at different radio wave receiving points, then reflected signals with zero phase difference can be suppressed, but reflected signals with non-zero phase difference cannot be suppressed
Solution Approach 1:
The patent introduces a phase rotation amount parameter that is calculated based on the phase difference between radar images. By dynamically adjusting the phase rotation amount according to the calculated phase difference, the system can suppress reflected signals regardless of whether their phase difference is zero or non-zero, thus resolving the limitation of the conventional method
Solution Approach 2:
The patent implements a feedback mechanism where the phase difference is calculated from the radar images, and this calculated phase difference is then used to determine the phase rotation amount. This feedback loop enables the system to adapt to different phase difference conditions and suppress reflected signals effectively in various scenarios
2Manufacturing precision
If multiple reflected signals are present in one pixel due to layover, then signal overlap occurs, but calculating phase differences does not eliminate all overlapping signals
Solution Approach 1:
The patent applies different phase rotation amounts to different pixels based on their specific phase difference characteristics. By tailoring the phase rotation to the local phase difference conditions of each pixel, the system can effectively suppress reflected signals and improve signal purity in pixels with multiple overlapping signals
Data Source
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AI summary
A radar image processing device (10) includes a phase difference calculating unit (23) for calculating a phase difference, which is the difference between the phases, with respect to the radio wave receiving points different from each other, of each of a plurality of reflected signals present in one pixel, and the rotation amount calculating unit (31) that calculates each of the phase rotation amounts in a plurality of pixels included in the second radar image from the respective phase differences, in which the difference calculating unit (32) rotates the phases in the plurality of pixels included in the second radar image on the basis of the respective rotation amounts, and calculates a difference between pixel values of pixels at corresponding pixel positions among the plurality of pixels included in the first radar image and the plurality of pixels obtained by the phase rotation included in the second radar image.