Moving Object Detector Coordinate Conversion for Trajectory Accuracy
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Solution Overview
Problem
Conventional moving object detectors face challenges in accurately determining the travel trajectory of a preceding vehicle due to the influence of the subject vehicle's behavior, leading to difficulties in acquiring an unbiased position history of the moving object.
Innovation Solution
A moving object detector system that includes a moving-object relative position acquiring unit, a subject-vehicle state quantity acquiring unit, and a coordinate converter, which converts position coordinates from a subject-vehicle-based coordinate system to a moving-object-based coordinate system, minimizing the impact of the subject vehicle's behavior on the position history of the moving object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If position coordinates are acquired in a subject-vehicle-based coordinate system, then the detection system is simple to implement, but the position history is affected by the subject vehicle's behavior
Solution Approach 1:
The patent introduces a coordinate conversion process as an intermediary step between acquiring position data in the subject-vehicle-based coordinate system and using it for trajectory analysis. The coordinate converter transforms the position coordinates into a moving-object-based coordinate system, eliminating the influence of subject vehicle behavior while maintaining implementation feasibility.
Solution Approach 2:
The patent changes the reference frame parameter from a subject-vehicle-based coordinate system to a moving-object-based coordinate system. This parameter change transforms the position coordinates to remove the effect of subject vehicle motion, thereby improving the accuracy of position history without significantly complicating the system.
2Measurement precision
If position coordinates are converted to a moving-object-based coordinate system, then the accuracy of position history is improved, but the device complexity increases
Solution Approach 1:
The coordinate converter serves as an intermediary component that performs the transformation between coordinate systems. By introducing this dedicated conversion module, the system achieves accurate position history while maintaining clear functional separation and manageable complexity.
Solution Approach 2:
The coordinate converter is designed to handle multiple coordinate transformation tasks universally, not just for this specific application. This multi-functionality approach allows the same component to serve various purposes, reducing overall system complexity despite the added transformation capability.
Data Source
AI summary
Provided is a moving object detector capable of acquiring a position history of a moving object that is less affected by the behavior of a subject vehicle. In a moving object detector, a moving-object relative position acquiring unit acquires position coordinates of a moving object expressed in a subject-vehicle-based coordinate system that is based on the position of a subject vehicle. A subject-vehicle state quantity acquiring unit acquires the state quantity of the subject vehicle. A coordinate converter generates a history of position coordinates of the moving object expressed in a moving-object-based coordinate system that is based on the position of the moving object, on the basis of the position coordinates of the moving object expressed in the subject-vehicle-based coordinate system, and the state quantity of the subject vehicle.