Vehicle Radar Mounting Position Estimation Using Ground Reflections
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Solution Overview
Problem
Existing methods for determining the mounting position of a radar sensor in vehicles require factory calibration, special equipment, and the presence of targets, leading to increased costs and operational complexity.
Innovation Solution
A method that estimates the mounting position of a radar sensor using radar responses captured by the sensor, optimizing parameters of a predefined model based on the sequence of characteristics of these responses to determine the sensor's height and angle relative to the ground plane without factory calibration or special targets, utilizing a processing unit to adapt a parametric model to the radar responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If factory or garage alignment is performed using special equipment and trained experts, then mounting position estimation precision is improved, but device complexity and cost increase
Solution Approach 1:
The radar sensor performs self-calibration by using the ground plane as a natural reference target. The system automatically determines mounting position parameters by analyzing radar responses from the ground, eliminating the need for external alignment equipment and trained experts while maintaining high precision
Solution Approach 2:
The ground plane serves as an intermediary reference object that enables mounting position estimation. By using the ground as a natural target with known characteristics (flat surface at zero height), the system can derive mounting position parameters without requiring specialized calibration equipment
2Measurement precision
If factory or garage alignment is performed, then mounting position estimation precision is improved, but loss of time increases
Solution Approach 1:
The system performs preliminary calibration actions by continuously monitoring radar responses from the ground plane and updating mounting position parameters in advance. This allows the system to be pre-calibrated during normal operation, eliminating the need for time-consuming factory or garage alignment procedures
Solution Approach 2:
The mounting position estimation is performed continuously during normal radar operation by constantly analyzing ground plane reflections. This continuous calibration process replaces discrete, time-consuming alignment procedures while maintaining ongoing precision
3Adaptability or versatility
If online calibration with targets of opportunity is performed, then adaptability is improved, but reliability decreases due to dependency on external targets
Solution Approach 1:
The ground plane serves as a universal reference target that is always available in the radar's field of view during normal vehicle operation. This eliminates dependency on specific external targets while providing consistent calibration data, improving both adaptability and reliability
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 accurate and reliable estimation of the radar sensor's mounting position with high flexibility and low effort, allowing for real-time adjustments during the vehicle's life cycle, such as after accidents or changes in load, without the need for additional equipment or targets.
Implementation Method 1
a radar sensor (11) at a vehicle is provided, wherein the radar sensor (11) has a mounting position with respect to a ground plane
Implementation Method 2
The transmitting part may include one or more transmitter elements, whereas the receiving part may include one or more receiver elements. The transmitter elements may be transmitting antenna elements which transmit radar waves to an object in the external environment of the vehicle. The receiver elements may be receiving antenna elements receiving the radar waves which are transmitted by the transmitter elements and which are reflected at the object
Data Source
AI summary
A method is provided for determining a mounting position of a radar sensor at a vehicle. The mounting position is defined with respect to a ground plane on which the vehicle is currently located. Radar responses captured by the radar sensor are received, wherein a field of view of the radar sensor covers at least a predefined area of the ground plane. A sequence of characteristics of the radar responses is determined, and the mounting position is determined by performing the operations of optimizing parameters of a predefined model with respect to the sequence of characteristics of the radar responses, and determining the mounting position based on the optimized parameters of the predefined model.