Axial Displacement Estimation Using Median-Guided Radar Filtering
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Solution Overview
Problem
Existing radar systems suffer from deteriorated estimation accuracy of axial displacement angles due to the exclusion of certain displacement angles without adequately addressing the asymmetry in frequency distributions, leading to inaccurate axial displacement angle estimation.
Innovation Solution
An axial displacement estimation device that calculates both the average and median values of axial displacement angles within a predetermined range, and uses these values to determine an allowable condition for accurate estimation, ensuring the use of the average value only when the condition is met, thereby improving estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the average value of axial displacement angles is used as the estimation result, then the calculation is simple, but the estimation accuracy deteriorates when the frequency distribution is asymmetric
Solution Approach 1:
The patent introduces a median value as an intermediary indicator to evaluate the reliability of the average value. By comparing the difference between the average value and median value against a threshold, the system determines whether the frequency distribution is symmetric enough for the average value to be reliable, thus resolving the contradiction between calculation simplicity and estimation accuracy
Solution Approach 2:
The patent implements a feedback mechanism where the median value is calculated and compared with the average value to determine whether to accept or reject the average value as the final estimation result. This feedback loop ensures that the simple average calculation is only used when conditions permit, otherwise alternative handling is applied to maintain accuracy
2Reliability
If axial displacement angles outside a predetermined range are excluded, then outliers are removed, but the frequency distribution asymmetry remains unaddressed leading to inaccurate estimation
Solution Approach 1:
The patent introduces a median value as an intermediary indicator to evaluate the reliability of the average value. By comparing the difference between the average value and median value against a threshold, the system determines whether the frequency distribution is symmetric enough for the average value to be reliable, thus resolving the contradiction between calculation simplicity and estimation accuracy
Solution Approach 2:
The patent implements a feedback mechanism where the median value is calculated and compared with the average value to determine whether to accept or reject the average value as the final estimation result. This feedback loop ensures that the simple average calculation is only used when conditions permit, otherwise alternative handling is applied to maintain accuracy
Data Source
AI summary
An axial displacement angle estimation device repeatedly calculates an axial displacement angle based on the detection result of the radar apparatus. The axial displacement angle estimation device extracts the axial displacement angle included in a predetermined extraction angle range among a plurality of axial displacement angles, and calculate an average value and a median value of the extracted plurality of axial displacement angles to be an axial displacement angle average value and an axial displacement median value. The axial displacement angle estimation device determines, based on the axial displacement angle average value and the axial displacement angle median value, whether a predetermined allowable condition is met. The axial displacement angle estimation device utilizes, when determined that the predetermined allowable condition is met, the axial displacement angle average value as an estimation result of the axial displacement angle.