Moving Object Detection Apparatus Multipath Error Suppression
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Solution Overview
Problem
Existing moving object detection systems face accuracy issues due to lowered Signal-to-Noise (S/N) ratios caused by multipath propagation, leading to incorrect azimuth detection and position accuracy problems.
Innovation Solution
A moving object detection apparatus that suppresses the tracking of observed points in the estimated trajectory when a significant received-electric-power difference is detected, indicating a lowered S/N ratio, by setting tracking filter coefficients to reduce the impact of low-position detection accuracy, thereby improving the accuracy of moving object position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar waves are transmitted to detect moving objects, then detection coverage is improved, but multipath propagation causes lowered S/N ratio and position accuracy deterioration
Solution Approach 1:
The patent converts the harmful multipath propagation effect into a useful detection mechanism by monitoring received electric power variations. When multipath propagation occurs, it causes characteristic drops in received power that the system detects and uses to identify and suppress affected tracking points, thereby transforming the harmful interference into a diagnostic signal for improving position detection accuracy
Solution Approach 2:
The system dynamically changes the tracking filter coefficients based on received electric power levels. When multipath propagation is detected through power drop analysis, the system adjusts the tracking parameters to reduce the influence of affected observation points, thereby maintaining accurate trajectory estimation despite the presence of multipath interference
2Measurement precision
If tracking filter coefficients are adjusted to suppress multipath effects, then position detection accuracy is improved, but tracking responsiveness may be reduced
Solution Approach 1:
The patent implements dynamic adjustment of tracking filter coefficients based on real-time received electric power analysis. The system continuously monitors power levels and adaptively modifies tracking parameters, allowing the tracker to be aggressive when conditions are good (maintaining responsiveness) and conservative when multipath interference is detected (maintaining accuracy), thus achieving both speed and precision
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
The apparatus enhances the accuracy of detecting moving object positions by suppressing the influence of low-position detection points, resulting in improved tracking trajectory estimation and reduced errors from multipath propagation effects.
Implementation Method 1
a radar apparatus that is mounted to a vehicle to transmit and receive radar waves
Implementation Method 2
lowered Signal-to-Noise (S/N) ratios caused by multipath propagation
Data Source
AI summary
A moving object detection apparatus estimates, based on observed-point positions indicated respectively by a plurality of pieces of observed-point information, a tracking trajectory tracking movement of a moving object. The apparatus stores, based on received electric powers indicated respectively by the pieces of the observed-point information, a maximum received-electric-power. The apparatus determines, for each of the pieces of the observed-point information, whether a received-electric-power difference is greater than a drop determination value. The apparatus also determines, for each of the pieces of the observed-point information, whether the received electric power indicated by the piece of the observed-point information is not higher than a recognition determination value. When the received-electric-power difference is determined to be greater than the drop determination value and the received electric power is determined to be not higher than the recognition determination value, the apparatus suppresses the degree of tracking the observed points in the tracking trajectory.