On-Vehicle Radar Threshold Adjustment for Detection Accuracy
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Solution Overview
Problem
Conventional on-vehicle radar devices struggle to accurately detect vehicles in the center area of the detection range, leading to potential omission of vehicles in front, especially in active cruise control systems, and can misdetect vehicles on the same lane as those on a different lane, particularly in changing travel conditions.
Innovation Solution
The on-vehicle radar device divides the detection range into multiple areas and sets distinct thresholds for each area based on traveling conditions, such as velocity and road shape information, to differentiate between vehicles and obstacles, and adjusts these thresholds dynamically according to the relative velocity and road type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a high threshold is set for the center area of the detection range to block noise, then noise rejection is improved, but detection of vehicles in front at the center area is worsened
Solution Approach 1:
The patent applies dynamics by making the threshold value changeable based on detection history. When a vehicle is continuously detected in the center area over multiple cycles, the threshold for that area is automatically lowered to ensure reliable detection. This dynamic adjustment resolves the contradiction by adapting the fixed threshold to actual detection needs, maintaining noise rejection while preventing missed detection of vehicles in front.
Solution Approach 2:
The patent changes the parameter (threshold value) based on detection conditions. By monitoring whether objects are detected in each area over consecutive detection cycles, the system adjusts threshold values dynamically - lowering thresholds in areas where vehicles are consistently detected and maintaining higher thresholds in areas where only noise is present. This parameter change strategy resolves the contradiction between noise rejection and vehicle detection accuracy.
2Measurement precision
If a low threshold is set for the edge area of the detection range to receive reflection waves easily, then detection sensitivity at edges is improved, but false detection of obstacles as vehicles is worsened
Solution Approach 1:
The patent applies dynamics by adjusting threshold values based on continuous detection results. In edge areas where false detections are problematic, the system monitors whether detected objects persist across multiple detection cycles. Only objects that are consistently detected maintain low thresholds, while transient detections (likely false positives) result in threshold increases. This dynamic adjustment maintains detection sensitivity while improving reliability by filtering out false detections.
3Device complexity
If a single threshold value is used for all detection areas, then system complexity is reduced, but detection accuracy varies across different areas is worsened
Solution Approach 1:
The patent applies segmentation by dividing the detection range into multiple areas (center area and edge areas) and assigning different threshold values to each area. The center area, where vehicle-in-front detection is critical, receives specialized threshold management that lowers thresholds when vehicles are detected. Edge areas maintain higher thresholds to reduce false detections. This spatial segmentation resolves the contradiction by allowing area-specific optimization 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 approach enhances the detection accuracy of vehicles in the center area, prevents detection errors, and allows for effective differentiation between vehicles on the same lane and obstacles, thereby improving the reliability of active cruise control and pre-crash safety systems.
Implementation Method 1
a transmission antenna 13 for transmitting a radio wave 3 to an object 4
Implementation Method 2
a plurality of reception antennas 14a to 14z for receiving the radio wave 3 reflected by the object 4
Data Source
AI summary
An on-vehicle radar device has a transmission section for transmitting a radio wave to an object, a receive section for receiving the radio wave reflected by the object, and a processing section for dividing an object detection range into three or more of a plurality of areas, setting a threshold of an intensity of the radio wave received for each of the plurality of areas, and judging the existence of an object by comparing the intensity of the radio wave and the threshold. This processing section sets, based on an auto-cruise control mode or pre-crash mode of the vehicle, a threshold of a part of an area in the object detection range to be lower than the threshold of the other areas, or changes the threshold of the detection area according to the object detection status.