Radar Sensor Self-Calibration for Driver Assistance Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driver assistance systems for motor vehicles face delays in detecting and compensating for radar sensor adjustment errors, leading to restricted availability of assistance functions, especially due to sudden errors caused by vibrations during operation.
Innovation Solution
The method involves continuous recalibration of the radar sensor during operation to improve estimation accuracy of adjustment errors, allowing for a gradual expansion of system functions based on improved estimation, even if the exact error size is not yet known, and enabling quicker reaction to errors without initial calibration or reducing assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If statistical evaluation of measurements is performed over a certain period to determine adjustment error, then measurement accuracy is improved, but response time to sudden errors increases
Solution Approach 1:
The patent implements dynamic adjustment of measurement duration based on operational context. The system performs quick initial assessments during critical phases (e.g., lane changes, merging) where rapid error detection is essential, while allowing longer measurement periods during stable cruising. This dynamic approach resolves the contradiction by adapting the measurement time scale to the actual operational needs, ensuring both accuracy and timely response.
Solution Approach 2:
The system performs preliminary quick assessments of adjustment error using shorter measurement periods before critical maneuvers. By conducting preliminary checks during normal operation and before essential driving tasks, the system prepares compensation data in advance, reducing the effective response time when sudden errors occur during critical operations.
2Reliability
If driver assistance functions are restricted until adjustment errors are recognized and compensated, then system reliability is improved, but function availability decreases
Solution Approach 1:
The patent implements partial function availability based on confidence levels. Instead of completely restricting all functions when adjustment errors are detected, the system provides reduced but still functional assistance. For example, distance control may operate with reduced precision or limited range, allowing the driver to benefit from partial automation while the system continues to monitor and refine adjustment error compensation, thereby maintaining both reliability and usability.
Solution Approach 2:
The system dynamically adjusts operational parameters of driver assistance functions based on the confidence level of adjustment error compensation. When confidence is high, full functionality is available; when confidence is lower, parameters such as detection range, response thresholds, or assistance intensity are adjusted to maintain reliable operation while preserving partial function availability.
3Manufacturing precision
If initial calibration of the radar sensor is performed, then manufacturing precision is improved, but assembly time increases
Solution Approach 1:
The patent implements self-calibration functionality where the radar sensor automatically determines and compensates for its own adjustment errors during vehicle operation. The system uses statistical evaluation of measurements collected during normal driving to identify adjustment deviations and applies computational compensation, eliminating the need for manual calibration procedures during assembly and reducing dependency on specialized calibration equipment.
Solution Approach 2:
The patent replaces mechanical calibration procedures with computational methods. Instead of physically adjusting the radar sensor during assembly, the system uses algorithms to calculate adjustment errors from measurement data and applies software-based compensation, substituting mechanical adjustment processes with electronic/computational solutions that are faster and more flexible.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A method for operating a driver assistance system for motor vehicles which comprises a radar sensor and has a variable functional scope, with continuous recalibration of the radar sensor in order to compensate for adjustment errors during ongoing operation, characterized by the following steps: estimating the adjustment error on the basis of a measurement over a limited first operating time period (S3), restricting the functional scope of the driver assistance system depending on the estimated adjustment error (S5), continuing the measurement during operation with a restricted functional scope within a second operating time period (42), for improving the estimation accuracy of the adjustment error (S7), and – extending the functional scope according to the improvement in the estimation accuracy (S9).