On-Vehicle Radar Axis Deviation Correction via Ignition Cycle Comparison
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Solution Overview
Problem
Conventional on-vehicle radar devices cannot accurately determine axis deviation when the vehicle is stationary, leading to potential displacement of the radar beam axis during parking, resulting in inaccurate solid object information and reduced safety when driving assistance is executed based on this information.
Innovation Solution
The on-vehicle radar device calculates the similarity between stationary reflection point information sets obtained before and after the ignition switch is turned off and on, and only provides solid object information to other devices if the similarity exceeds a threshold, ensuring accurate axis deviation correction and preventing the provision of inaccurate information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar device uses conventional axis deviation detection methods based on vehicle speed and relative speed, then the device can update axis deviation during vehicle operation, but the axis deviation cannot be accurately determined when the vehicle is stationary, leading to potential radar beam displacement during parking
Solution Approach 1:
The system performs preliminary actions by acquiring stationary reflection point information before the ignition is turned off and after it is turned on again. This allows the system to detect changes in the radar beam axis position during parking without requiring the vehicle to be in motion, thereby maintaining measurement accuracy when the vehicle is stationary.
Solution Approach 2:
The system uses feedback by comparing the stationary reflection point information acquired before and after the ignition cycle. This comparison provides feedback about the radar beam axis displacement during parking, enabling the system to update the axis deviation accurately and maintain reliable solid object information.
2Productivity
If the radar device continues to provide solid object information after parking, then the driving assistance function remains available, but the information may be inaccurate due to unupdated axis deviation
Solution Approach 1:
The system uses feedback by comparing stationary reflection point information before and after the ignition cycle to detect radar beam axis displacement. When displacement is detected, the system can determine whether to provide solid object information, ensuring that only accurate information is provided to the driving assistance function.
Solution Approach 2:
The system performs preliminary detection of axis deviation by acquiring stationary reflection point information before the ignition is turned off. This preliminary action allows the system to prepare accurate axis deviation data in advance, ensuring that when the vehicle resumes operation, the solid object information is based on the most recent and accurate measurements.
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
This approach ensures that accurate solid object information is provided to driving assistance devices only when the radar beam axis has not been displaced during parking, enhancing safety by preventing the use of potentially inaccurate data for driving assistance.
Implementation Method 1
receives radio waves reflected by solid objects located within the predetermined area
Implementation Method 2
acquires solid object information related to the solid objects located in the predetermined area based on physical quantities related to the emitted and received radio waves
Data Source
AI summary
The on-vehicle radar device 1 can acquire sets of stationary reflection point information SI, which consist of information related to each reflection point that is stationary in the vicinity of the own vehicle, based on the physical quantities of radio waves emitted and received by the transceiver. If the similarity SIM between the first set of stationary reflection point information acquired at the first point in time before the ignition switch transitions from the ON to the OFF state after the vehicle has stopped, and the second set of stationary reflection point information acquired at the second point in time after the ignition switch has transitioned back to the ON state before the vehicle starts moving, is below the threshold SIMth, then the device does not provide the solid object information to other devices until certain conditions are met after the vehicle has started moving.