Vehicle Sensor Calibration via External Trajectory Tracking
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Solution Overview
Problem
Current methods for calibrating sensors in driver assistance systems are time-consuming and require complex multilateration, making them inefficient for factory calibration and subsequent vehicle deployment.
Innovation Solution
A method and system for initial sensor calibration using a reference device externally to detect the vehicle's trajectory, ascertain the sensor axis, and calculate the alignment angle between the sensor and travel axes, allowing for rapid and accurate calibration via wireless data transfer, utilizing a point target device and electronic control device, suitable for various sensor types like video, radar, and lidar sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional multilateration method is used for sensor calibration, then measurement precision can be achieved, but calibration time is excessive and process complexity increases
Solution Approach 1:
The patent extracts the essential calibration function from the complex multilateration process by using a single reference device to track vehicle trajectory. Instead of multiple devices performing complex triangulation, one reference device captures position data along the vehicle's path, which is then processed to determine sensor alignment parameters, significantly reducing calibration time while maintaining precision
Solution Approach 2:
The system performs preliminary trajectory detection and sensor axis ascertainment before final alignment calculation. By pre-capturing vehicle trajectory data through the reference device and pre-determining sensor axis orientation, the system prepares all necessary information in advance, enabling rapid computation of the alignment angle without time-consuming real-time measurements
2Measurement precision
If complex multilateration is used for calibration, then alignment accuracy can be achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the complexity of multilateration by extracting only the necessary function: trajectory detection. Instead of deploying multiple reference devices for triangulation, a single reference device is used to track the vehicle's movement path, and the alignment angle is derived from trajectory analysis combined with sensor axis data, greatly simplifying the system architecture
Solution Approach 2:
The patent replaces complex mechanical calibration systems with computational methods. Rather than using multiple physical reference devices and mechanical measurement apparatus, the system uses electronic trajectory tracking and computational geometry to calculate the alignment angle from position data and sensor axis information, reducing both device complexity and manufacturing costs
3Manufacturing precision
If traditional calibration on chassis stand is performed, then sensor alignment can be established, but production efficiency decreases
Solution Approach 1:
The system performs preliminary data collection during normal vehicle operation or movement. The reference device captures trajectory data as the vehicle moves, and the sensor axis is determined during this movement, allowing calibration calculations to be completed without stopping the production line or requiring separate calibration sessions, thereby maintaining high production throughput
Solution Approach 2:
The patent transitions from static calibration on a fixed chassis stand to dynamic calibration during vehicle movement. By acquiring trajectory data while the vehicle is in motion and calculating alignment parameters dynamically, the system eliminates the need for time-consuming static calibration procedures, significantly improving production efficiency while maintaining accuracy
Data Source
AI summary
A method for initial calibration of a sensor for a driver assistance system of a vehicle, comprising the steps of: detecting a trajectory of the vehicle by way of a reference device disposed externally to the vehicle; ascertaining a sensor axis of the sensor; ascertaining a travel axis of the vehicle from the detected trajectory; and ascertaining an angle between the sensor axis and the travel axis.