Onboard Radar Mounting Angle Error Detection Using Linear Approximation
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Solution Overview
Problem
Conventional methods for detecting mounting angle errors in onboard radar apparatuses require a significant amount of time to achieve accurate results, as they rely on collecting observation data where relative speed is zero.
Innovation Solution
A method and apparatus that utilize continuous waves to determine the mounting angle error by calculating an approximated straight line from relative speed and orientation data, allowing for error detection using observation data with non-zero relative speeds, and incorporating a correction unit to improve orientation detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If observation data with relative speed zero is collected to estimate mounting angle error, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent changes the parameter selection criterion from requiring relative speed to be exactly zero to using relative speed within a predetermined range (including non-zero values). This parameter relaxation allows using more observation data points, thereby reducing data collection time while maintaining estimation accuracy through the linear approximation method that compensates for the non-zero speed effects.
2Measurement precision
If conventional method using only zero relative speed data is used, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent applies partial action by using relative speed data within a predetermined range around zero rather than strictly zero. This partial relaxation of the speed constraint allows incorporating additional observation data that would otherwise be excluded, thereby increasing productivity through faster data accumulation while maintaining sufficient precision through the linear approximation correction.
3Loss of time
If observation data with non-zero relative speed is used, then loss of time is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent implements feedback through the linear approximation method that models the relationship between relative speed and orientation. By calculating the approximated straight line from multiple data points (including non-zero speed data) and using it to correct the mounting angle estimation, the system compensates for the precision loss from using non-zero speed data, thereby maintaining accuracy while reducing data collection time.
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 enables rapid acquisition of accurate mounting angle error data, reducing the time needed for calculation and enhancing orientation detection accuracy by utilizing existing onboard radar apparatus components without additional structure.
Implementation Method 1
a relative speed to an object that has reflected the continuous waves is determined by a frequency analysis being performed on a signal obtained by the continuous waves being transmitted and received
Data Source
AI summary
In a mounting angle error detection method, a relative speed to an object that has reflected continuous waves is determined. An estimated orientation of the object is determined for each frequency bin. An approximated straight line that indicates a relationship between a relative speed of a stationary object relative to the own vehicle and an orientation at which the stationary object is positioned is calculated from the relative speed and estimated orientation determined. As a mounting angle error of the onboard radar apparatus, a difference between an orientation angle identified from the approximated straight line and at which the relative speed of the stationary object relative to the own vehicle is zero, and an orientation angle at which the relative speed of the stationary object relative to the own vehicle is zero when the onboard radar apparatus is mounted in the own vehicle at a predetermined mounting angle is determined.