On-board Radar Lateral Position Detection for Passing Vehicle Classification
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Solution Overview
Problem
On-board radar systems struggle to accurately determine whether an object next to a vehicle is stationary or moving at the same speed, leading to incorrect assessments of passing vehicles and stationary objects.
Innovation Solution
An on-board radar apparatus is configured to detect observation points within a side determination range, using radar waves to identify positions and determine the presence of a traveling vehicle without relying on relative speed, by setting a passing determination line at 90 degrees to the vehicle's front-rear direction and using a signal processing unit to analyze beat signals for distance and azimuth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the on-board radar apparatus uses relative speed to detect objects, then the detection process is simple, but it cannot distinguish between stationary objects and moving objects traveling at the same speed as the own vehicle
Solution Approach 1:
The patent transitions from one-dimensional speed-based detection to two-dimensional position-based detection by introducing lateral position measurement. The radar apparatus now measures both distance and lateral position of objects, enabling classification based on spatial coordinates rather than solely on speed. This dimensional expansion allows the system to distinguish stationary objects from moving objects that have zero relative speed.
Solution Approach 2:
The patent changes the detection parameter from speed (which is zero for both stationary objects and objects moving at the same speed) to lateral position (which differs between the two cases). By measuring the lateral position relative to the own vehicle and comparing it against threshold values, the system can classify objects as stationary or moving despite having the same speed characteristics.
2Reliability
If the radar detects objects with zero relative speed as stationary, then the detection is straightforward, but it causes false determination that a vehicle has completed passing when it is still present
Solution Approach 1:
The patent implements a feedback mechanism where the lateral position of detected objects is continuously monitored and fed back to the determination logic. When an object is detected with zero relative speed, the system checks its lateral position against the passing determination line. If the object remains on one side of the line, the system maintains the understanding that the vehicle is still present, preventing false determination of completed passing.
Solution Approach 2:
The patent introduces the lateral position measurement as an intermediary parameter that mediates between the radar detection and the passing determination. Instead of directly determining passing status from speed information alone, the system uses lateral position as an intermediate check to verify whether the object has actually crossed the passing determination line, thereby preventing false positives.
3Measurement precision
If the radar determines passing based on zero relative speed, then the determination is simple, but it causes false detection of vehicles that are not present
Solution Approach 1:
The patent adds the lateral position dimension to the detection process. Instead of relying solely on speed information, the system now considers both speed and lateral position. By checking whether detected objects are located on the appropriate side of the passing determination line, the system can distinguish between actual passing vehicles and false detections, improving accuracy without excessive complexity.
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 configuration improves the accuracy of detecting passing vehicles by aligning observation points along the passing determination line, reducing false positives and negatives, and enabling timely notifications to vehicle occupants.
Implementation Method 1
an on-board radar apparatus that detects an object present in the vicinity of a vehicle by irradiating radar waves as transmission waves over a predetermined angle in the vicinity of the vehicle and receiving reflected waves
Data Source
AI summary
A radar apparatus detects an observation point distance and an observation point azimuth. In addition, the radar apparatus calculates an observation point lateral position and an observation point vertical position based on the observation point distance and the observation point azimuth. Furthermore, the radar apparatus determines that a traveling vehicle is detected when a number of observation points included within a side determination range is equal to or greater than a predetermined traveling vehicle determination count, based on the observation point lateral position and the observation point vertical position. The side determination range is set so as to include a passing determination line so as to extend in a direction at 90 degrees relative to a front-rear direction of the vehicle to the side of the vehicle.