Modular Radar FOV Alignment Through Vehicle-Side Self-Calibration
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Solution Overview
Problem
Existing automotive radar systems struggle to efficiently focus radar operation on a narrower range of coverage areas, which is crucial for accurate object detection and automated driving features, especially when mounted at multiple vehicle locations.
Innovation Solution
A modular radar system with a controllable RF section and control section that determines the vehicle side of installation through calibration, using external or internal targets to focus transmission and reception in specific fields of view (FOVs) and switches between calibration tables based on detection of reflections, ensuring accurate FOV alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radar system is designed to operate in multiple fields of view to accommodate different vehicle locations, then the adaptability of the radar system is improved, but the device complexity increases due to the need for multiple calibration configurations
Solution Approach 1:
The radar system is designed with a single modular unit that can universally operate in multiple fields of view (first FOV and second FOV) depending on its mounting location on the vehicle. The RF section and control section are configured to support both FOVs, allowing the same hardware to serve multiple installation positions without requiring location-specific hardware variations.
Solution Approach 2:
The system dynamically changes operational parameters by selecting between different calibration tables (first calibration table and second calibration table) based on the detected mounting side. This parameter switching allows the radar to adapt its signal processing and beamforming characteristics to match the appropriate FOV without physical reconfiguration, thereby managing complexity through software-based adaptation.
2Measurement precision
If the radar system uses additional wiring to determine installation location and configure FOV, then the measurement precision of installation location is improved, but the ease of manufacture deteriorates due to increased assembly time and cost
Solution Approach 1:
The radar system performs self-calibration by automatically detecting its own mounting location through calibration operations. The controller executes calibration routines that involve transmitting RF signals and analyzing reflections from predetermined targets, enabling the system to autonomously determine whether it is mounted on the first or second side of the vehicle without external wiring or manual configuration.
Solution Approach 2:
The patent replaces the mechanical/electrical wiring-based location detection method with an electromagnetic field-based calibration method. Instead of using additional wires to transmit location information, the system uses RF signal transmission and reflection analysis to detect the mounting side, thereby eliminating the need for extra wiring and simplifying the manufacturing process.
3Reliability
If the radar system performs comprehensive calibration operations to accurately determine vehicle side, then the reliability of FOV alignment is improved, but the loss of time during calibration and initialization increases
Solution Approach 1:
The system performs calibration operations using predetermined targets that are pre-positioned on the vehicle during manufacturing. These calibration targets are established in advance, allowing the radar system to quickly execute calibration routines by simply transmitting signals and detecting reflections from the known target positions, rather than requiring time-consuming environmental scanning or manual calibration procedures.
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 precise radar operation focusing based on vehicle side installation, reducing assembly costs and time by eliminating the need for additional wiring, and enhancing the reliability of automated driving features like ACC, AEB, and IPS.
Implementation Method 1
the modular radar system transmits RF energy and listens for a reflection from a predetermined target mounted on one side of the vehicle
Data Source
AI summary
A radar system includes a radio frequency (RF) section that is controllable to focus operation in one of a plurality of fields of view (FOVs) and a control section configured to identify a side of the vehicle in which the radar system is installed and direct the RF section to focus transmission and reception in one of a first or a second FOV based on the side of the side of the vehicle in which the radar system is installed. A method includes: transmitting RF energy and listening for a reflection from a predetermined target mounted on one side of a vehicle; determining a whether a reflection has been detected; and directing the RF section to focus operations to the FOV that is predetermined for use for a radar system mounted on a same side of the vehicle as the predetermined target when a reflection has been detected.