Scattering Aperture Imaging for Rough Relay Surfaces
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Solution Overview
Problem
Existing radar non-line-of-sight (NLOS) imaging technologies under the three-time reflection model are limited by requiring an ideal smooth relay surface and are not suitable for rough surfaces with diffuse reflections, making them ineffective for complex scenarios.
Innovation Solution
A scattering aperture imaging method that estimates the position of a main scatterer, performs azimuth resampling and range compensation, and transforms the NLOS imaging problem into a line-of-sight (LOS) imaging problem using synthetic aperture radar techniques, allowing for imaging with rough relay surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specular reflection model is used for NLOS imaging, then imaging precision is improved, but adaptability to rough surfaces deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of the reflection model from specular reflection to diffuse reflection model. By adopting a different physical model parameter (diffuse reflection coefficient instead of specular reflection coefficient), the system achieves adaptability to rough surfaces while maintaining imaging capability through the scattered aperture formation mechanism.
Solution Approach 2:
The patent introduces the concept of a scattering aperture as an intermediary element between the relay surface and the object. This scattering aperture, formed by the distributed scatterers on the rough surface, acts as a mediator that enables imaging despite the absence of a smooth reflective surface, bridging the gap between rough surface conditions and imaging requirements.
2Manufacturing precision
If ideal smooth relay surface is required, then imaging quality is improved, but application scope deteriorates
Solution Approach 1:
The patent converts the harmful effect of surface roughness (which causes diffuse reflection and degrades imaging quality in traditional models) into a beneficial feature. By utilizing the diffuse reflection characteristics of rough surfaces to form scattering apertures, the system transforms what was previously a limitation into the foundation of its imaging mechanism, thereby expanding application scope to include rough surfaces.
Solution Approach 2:
The patent fundamentally changes the surface condition parameter from smooth to rough, and correspondingly changes the reflection model parameter from specular to diffuse. This parameter transformation allows the system to maintain imaging quality while dramatically expanding the range of applicable surfaces beyond ideal smooth surfaces.
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 method effectively adapts to rough relay surfaces, widening the application range of radar NLOS imaging by linking the NLOS imaging problem with LOS imaging, and achieving suitable imaging results even with complex surface conditions.
Implementation Method 1
a signal transmitted by a radar R reaches an object O after one reflection on a relay surface S, and an echo reflected by the object O is received by the radar R after a further reflection on the relay surface S
Implementation Method 2
scattering aperture imaging method... under the condition of a rough relay surface... there is a diffuse reflection component in the reflection of the radar signal
Data Source
AI summary
Provided are a scattering aperture imaging method and a device, a system and a storage medium. The method mainly includes four steps of scattering point position estimation, azimuth resampling, range compensation and synthetic aperture radar imaging. A phased array radar with a fixed position is used for NLOS imaging, and the radar can control a beam to scan in space, which is equivalent to a scattering aperture moving along a relay surface. Therefore, the method can realize converting NLOS imaging into LOS synthetic aperture radar imaging, which can be suitable for the situation that a relay surface is rough and the relay surface with more complicated surface condition, thus widening the application range of radar NLOS imaging.