Radar Sensor Module Polarization Control for Vehicle Integration
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Solution Overview
Problem
The high cost and complex integration of conventional radar and camera sensor systems for vehicles limit their availability as standard safety equipment, as they require multiple sensors at various locations, increasing complexity and cost.
Innovation Solution
An integrated radar and camera module (RACam) is designed to be located behind a vehicle's window, using a radar sensor and processing circuitry to emit and detect radar signals with specific polarization characteristics, allowing for object detection and direction determination, while also incorporating a camera for image capture, thereby reducing sensor costs and simplifying integration by sharing electronics and signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate radar and camera sensors are used at various locations, then detection capability and safety performance are improved, but system cost and integration complexity increase
Solution Approach 1:
The patent combines radar and camera sensors into a single integrated module that is mounted at one location on the vehicle. The module shares common electronics, signal processing resources, and housing, while maintaining separate sensing functions. This merging approach reduces the number of discrete components from multiple separate sensors to a unified system, thereby reducing integration complexity while preserving detection capability.
Solution Approach 2:
The integrated module serves multiple functions simultaneously - it performs both radar-based object detection and camera-based visual monitoring. The shared electronics and processing resources handle both sensor types, making the system multi-functional. This universality allows a single module to replace what would traditionally require multiple separate sensors, reducing overall system complexity.
2Reliability
If multiple separate radar and camera sensors are deployed, then active safety coverage is improved, but system cost increases
Solution Approach 1:
By merging radar and camera sensors into a single integrated module with shared housing, electronics, and processing resources, the bill of materials is reduced. The common components can be manufactured and assembled more efficiently than multiple separate sensor systems, thereby reducing overall system cost while maintaining comprehensive active safety coverage.
Solution Approach 2:
The multi-functional integrated module performs both radar and camera sensing functions, eliminating the need for separate dedicated sensors. This universality allows a single module to provide the active safety coverage that would traditionally require multiple expensive discrete components, thereby reducing the overall system cost.
3Ease of operation
If radar signals are transmitted through the window at normal incidence, then signal transmission is simplified, but polarization control and detection accuracy deteriorate
Solution Approach 1:
The patent changes the incident angle parameter of the radar signal from normal incidence to oblique incidence at a specific angle θ. This parameter change enables the radar waves to interact with the window's birefringent properties, allowing polarization control and enhancement of detection accuracy through selective transmission of specific polarization components.
Solution Approach 2:
The patent introduces polarization-selective transmission by utilizing the window's optical anisotropy at oblique angles. Different polarization components of the radar signal are transmitted with different efficiencies, creating local quality differences in signal transmission that can be exploited for improved detection accuracy and target discrimination.
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
The integrated module reduces sensor costs and simplifies installation by using common electronics and signal processing, enabling high-capability active safety systems to be offered as standard equipment across various vehicles, enhancing vehicle safety features like adaptive cruise control and collision avoidance.
Implementation Method 1
The antenna is configured to emit a radar signal through the window and into the area. The radar signal is characterized by a transmitted polarization of the radar signal.
Implementation Method 2
A relative difference between the first characteristic and the second characteristic is selected based on a preferred angle of propagation of the radar signal through the window.
Data Source
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Figure 2
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AI summary
A sensor module (20) configured to be located behind a window (12) of a vehicle (10) to detect an object (16) through the window (12) and about the vehicle (10). The module (20) includes a radar unit with an antenna and a controller. The antenna emits and/or receives a radar signal (208) through the window (12) with a selected or preferred polarization. The polarization determines a preferred angle (206) of propagation of the radar signal (208) through the window (12) based on reflection characteristics of the window (12) that vary with impingement angle (206) and transmitted polarization. By varying the transmitted polarization vs. beam direction when a directional antenna is used, the signal propagating through the windshield can be maximized to enhance object (16) detection over a range of signal directions. Also, by varying the transmitted polarization when an omnidiredtional type antenna is used, the object (16) can be 'illuminated' with variable intensity and detected with variable sensitivity.