Submillimeter Radar Multi-Angle Object Classification
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Solution Overview
Problem
Submillimeter radar systems face challenges in discriminating objects in complex environments due to specular reflections and limited vertical resolution, which hinders object classification and imaging applications, especially in outdoor scenarios with complex backgrounds and foregrounds.
Innovation Solution
A submillimeter wavelength radar system with a receiver and signal processor that utilizes multiple illumination or receiving angles to derive information about object location and orientation, employing coherent downconversion to retain phase and amplitude information, and analyzing signals from different angles to determine object surfaces and classify objects using triangulation and image processing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If submillimeter radar systems use single-angle measurement, then the system complexity is reduced, but the object discrimination capability deteriorates due to specular reflections and limited spatial resolution
Solution Approach 1:
The patent transitions from single-angle radar measurement to multi-angle measurement by introducing multiple illumination or receiving angles. This dimensional change in measurement geometry enables the system to capture objects from multiple perspectives, overcoming the limitations of specular reflections and limited spatial resolution that plague single-angle systems.
Solution Approach 2:
The patent segments the measurement process by dividing the field of view into multiple angular sectors. Each sector is measured independently at different angles, and the results are synthesized to create a comprehensive object representation. This segmentation allows the system to resolve ambiguities caused by specular reflections by observing how reflections change with angle.
2Measurement precision
If submillimeter radar systems use multiple illumination or receiving angles, then the object discrimination capability is improved, but the device complexity increases
Solution Approach 1:
The patent implements a universal measurement framework where the radar system can operate in multiple modes (single-angle or multi-angle) depending on application requirements. The same hardware platform supports both simplified single-angle operation and enhanced multi-angle operation, providing flexibility and reducing the need for separate specialized systems.
Solution Approach 2:
The patent introduces signal processing techniques as intermediaries that synthesize multi-angle information from multiple measurements. Rather than requiring complex hardware changes, the system uses computational methods to combine measurements from different angles, creating enhanced object representations through software-based signal synthesis.
3Ease of operation
If conventional radar systems rely solely on radar cross section measurement, then the measurement process is simplified, but the ability to classify and qualify targets in complex environments deteriorates
Solution Approach 1:
The patent changes the measurement parameters by incorporating angular variation into the radar cross section measurement process. Instead of measuring RCS at a single angle, the system measures RCS across multiple angles and uses the angular dependence of the measurements to extract additional object characteristics. This parameter change enables classification and qualification of targets in complex environments while maintaining operational simplicity through automated processing.
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
Enhances object detection and classification capabilities by overcoming specular reflections and providing higher spatial resolution, enabling effective discrimination of objects in complex environments and improving resistance to interference from sunlight, fog, and precipitation.
Implementation Method 1
measuring the radar cross section—i.e. the fraction of wave power reflected by a square reference unit of a certain object
Implementation Method 2
a receiver for receiving and downconverting signals from content in a field of view of the system, the downconverted signals corresponding to a given point in the field of view having time varying amplitude and phase components
Data Source
AI summary
A submillimeter wavelength radar system has a receiver (20, 27, 90) for receiving and downconverting signals from content in a field of view of the system and a signal processor (30) arranged to determine information about the content from the downconverted signals, the radar system being arranged to obtain signals of the same points in the field of view from different illumination or receiving angles by having multiple illumination or receive positions, and the signal processor being arranged to use the determined information from the signals from the two or more angles to determine location or orientation of the content. By using information from different angles, it becomes possible to address or overcome the drawback of submillimeter wavelengths that most of the reflection is specular and so only surfaces of an object facing the radar system are detectable, meaning that many objects are unrecognisable.