Radar Apparatus Adaptive Range Adjustment for Curve Lanes
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Solution Overview
Problem
Existing radar systems face challenges in accurately determining the position of targets, particularly in curve-shaped lanes, leading to difficulties in vehicle follow-up control and adaptive cruise control, due to limitations in deriving representative positions of targets across varying road shapes.
Innovation Solution
A radar apparatus and signal processing method that sets a first range based on a reference target and expands to a second range when curve-shaped lane information is detected, excluding targets with large lateral distances to derive a representative position, enabling continuous follow-up of preceding vehicles regardless of road shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed first range is used for deriving representative position, then the processing is simple, but the accuracy deteriorates in curve-shaped lanes
Solution Approach 1:
The patent applies dynamics by making the detection range adjustable based on driving conditions. The control unit switches between a first range (for straight roads) and a second range (for curve-shaped roads) based on lane shape detection, allowing the system to adapt its parameters dynamically to maintain measurement precision across different operating conditions without excessive complexity
2Area of stationary object
If a wider second range is used in curve-shaped lanes, then the target detection coverage is improved, but the risk of including irrelevant targets increases
Solution Approach 1:
The patent applies local quality by applying different lateral distance threshold criteria for different target positions within the detection range. When deriving the representative position from multiple targets in the second range, the system uses the lateral distance threshold to selectively include only relevant targets, ensuring that the expanded range does not compromise reliability by incorporating irrelevant objects from adjacent lanes
3Measurement precision
If the lateral distance threshold is applied strictly, then neighboring lane targets are excluded, but targets in curve lanes may be incorrectly excluded
Solution Approach 1:
The patent applies dynamics by making the lateral distance threshold adjustable based on the detected lane shape. When a curve-shaped lane is detected, the control unit increases the lateral distance threshold compared to straight road conditions, allowing the system to maintain precise lane-specific target identification while adapting to different road geometries and avoiding incorrect exclusion of valid targets
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 solution allows for accurate and continuous vehicle control by determining the representative position of targets in the same lane, ensuring safe following distance and improved adaptive cruise control performance across different road shapes.
Implementation Method 1
a radar apparatus configured to radiate a transmission wave relating to a frequency-modulated transmission signal, receive a reflected wave of the transmission wave from a target as a reception signal, and derive at least position information of the target from the reception signal
Data Source
AI summary
There is provided a radar apparatus. A setting unit is configured to set a first range including at least a reference target. A deriving unit is configured to derive a representative position of targets included in the first range on the basis of position information of the targets included in the first range. An acquiring unit is configured to acquire vehicle information indicating that the vehicle is running in a curve-shaped lane or a road shape in front of the vehicle is a curve shape. When the acquiring unit acquires the vehicle information, the setting unit sets a second range wider than the first range and the deriving unit derives a representative position of targets included in the second range on the basis of position information of the targets included in the second range.