Multi-Polarized Radar for Small Object Detection
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Solution Overview
Problem
Current radar systems are ineffective in detecting small and slow-moving targets in dense weather conditions and noisy environments due to limited radar cross-section and background noise interference, particularly when using pulse radar and Continuous Wave Doppler Radar.
Innovation Solution
A millimeter-wave system employing multiple transmitters to transmit horizontally and vertically polarized radar signals, allowing a processor to determine the signal orientation with the highest signal-to-noise ratio for efficient detection and localization of small objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pulse radar is used to detect small and slow moving targets, then detection capability is improved, but detection reliability deteriorates due to limited radar cross section and background noise
Solution Approach 1:
The radar signal is divided into multiple orthogonal polarization components (horizontal and vertical). By segmenting the detection into separate polarization channels, the system can independently process signals from different polarization states, allowing small targets with limited radar cross-section to be detected in at least one channel without being overwhelmed by background noise affecting all channels equally.
Solution Approach 2:
The system changes the polarization parameter of the transmitted radar signal, using multiple orthogonal polarization states instead of a single polarization. This parameter change enables the radar to exploit the target's scattering characteristics across different polarization modes, improving detection reliability when the target's radar cross-section is small and susceptible to noise.
2Productivity
If CW Doppler Radar is used for detecting small and fast moving objects, then detection efficiency is improved, but detection reliability deteriorates due to surrounding noise
Solution Approach 1:
The detection process is segmented into multiple polarization channels that operate in parallel. This allows the system to maintain high detection efficiency through continuous wave operation while improving reliability by having multiple independent channels that can identify targets above the noise floor in at least one polarization state.
Solution Approach 2:
The radar system achieves multi-functionality by using the same CW Doppler transmission mechanism across multiple polarization channels. This universal approach maintains detection efficiency while extending reliability benefits across all channels, allowing the system to detect small fast-moving objects that might be obscured by noise in any single polarization channel.
3Measurement precision
If SAR systems use multiple polarization antennas, then object classification capability is improved, but system complexity increases due to requirement of separate sensors and specific processing
Solution Approach 1:
The system merges the multiple polarization detection functions into a single integrated radar platform. Instead of requiring separate sensors as in traditional SAR systems, the invention combines horizontal and vertical polarization transmission and reception capabilities within one radar system, reducing overall system complexity while maintaining the ability to perform object classification through polarization analysis.
Solution Approach 2:
The radar system achieves multi-functionality by incorporating both horizontal and vertical polarization capabilities within a single system architecture. This universal design allows the system to perform both detection and classification functions without requiring separate dedicated sensors, thereby improving object classification capability while avoiding the complexity of multiple independent systems.
4Length of stationary object
If radar systems operate in dense weather conditions and noisy environments, then detection range is maintained, but detection accuracy deteriorates due to background clutter and noise
Solution Approach 1:
The detection process is segmented into orthogonal polarization channels that independently process returns from different polarization states. In dense weather and noisy environments, this segmentation allows the system to maintain detection range by continuing to transmit and receive across multiple channels while improving accuracy by identifying targets that produce distinguishable polarization signatures above the cluttered background.
Solution Approach 2:
The system changes the polarization parameter to exploit differences between target scattering and background clutter scattering. By transmitting and receiving in multiple polarization states, the radar can identify targets whose scattering characteristics differ from the weather clutter, thereby maintaining detection range while improving accuracy in adverse environmental conditions.
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 reliable detection and localization of small objects in dense weather conditions and noisy environments by selecting the signal orientation with the highest signal-to-noise ratio, improving detection accuracy and range.
Implementation Method 1
a plurality of transmitters for transmission of a mm-wave radar signal to an object
Implementation Method 2
The transmitted mm-wave radar signal may include at least two signal orientations such as at least one horizontally polarized signal, and at least one vertically polarized signal
Data Source
AI summary
A millimeter or mm-wave system includes transmission of a millimeter wave (mm-wave) radar signal by a transmitter to an object. The transmitted mm-wave radar signal may include at least two signal orientations, and in response to each signal orientation, the object reflects corresponding signal reflections. The signal reflections are detected and a determination is made as to location of the object.