Millimeter Wave Radar Target Type Recognition
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Solution Overview
Problem
Conventional radar systems struggle to accurately identify the type of a target, such as a two-wheeler, relying on camera images for classification.
Innovation Solution
A millimeter wave radar apparatus using the FMCW method, which transmits frequency-modulated waves and processes reflected signals to calculate relative velocities of detected points, determines the type of a target by analyzing the spread of these velocities and comparing it to reference shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a radar apparatus alone is used to identify target type, then the system complexity is reduced and cost is lowered, but the identification accuracy is insufficient
Solution Approach 1:
The patent segments the target into multiple detected points and analyzes the relative velocity spread among these points. By dividing the target detection into discrete points and examining velocity variations across them, the system can identify target type (e.g., two-wheeler vs. four-wheeler) based on the distribution pattern of velocities, achieving accurate identification using radar data alone without requiring camera images or additional sensors
Solution Approach 2:
The patent changes the analysis parameter from simple target presence to the spread of relative velocities among detected points. By calculating and comparing the velocity spread distribution against reference shapes, the system transforms raw radar measurements into meaningful target type classification, enabling accurate identification while maintaining system simplicity
2Measurement precision
If camera images are used to identify two-wheelers, then identification accuracy is improved, but the system complexity and cost increase
Solution Approach 1:
The patent replaces the optical measurement system (camera) with a radar-based velocity analysis system. By substituting mechanical/optical image processing with electromagnetic wave-based velocity spread analysis, the system achieves the same target type identification function using only radar apparatus, thereby reducing system complexity while maintaining identification accuracy
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
Enables highly accurate recognition of specific targets, like two-wheelers, without the need for camera images, improving safety by providing precise information for driving support operations.
Implementation Method 1
a reflected wave that is reflected from a target object
Implementation Method 2
The position (distance and azimuth) or the relative velocity of the target is then detected on the basis of a frequency difference between transmission/reception signals
Data Source
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AI summary
This radar device can recognize the type of a specific target (in particular, a two-wheeled vehicle) with high precision, using only the radar device. The radar device comprises: a transmission unit that transmits a transmission wave, based on a transmission signal, toward the target; a receiving unit that receives a reflected wave generated by the transmission wave being reflected by the target, and thereby generates a reception signal; and a target detection unit that acquires information on the target on the basis of the transmission signal and the reception signal. The target detection unit calculates the relative speeds of a plurality of detection points within the same target, and determines the type of the target on the basis of the spread of the relative speeds.