Radar Lane-Change Tracking With Transverse Position Correction
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Solution Overview
Problem
Radar systems in advanced driver assistance systems (ADAS) struggle to accurately determine the transverse position of a target vehicle when it changes lanes, affecting acceleration and deceleration control due to limitations in estimating the lateral position.
Innovation Solution
A radar apparatus that transmits and receives signals to detect objects, estimates a heading angle based on accumulated data, determines lane change direction, and corrects the transverse position using weighted object assignments to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar is used to detect target position and speed for ADAS control, then detection capability is provided, but transverse position estimation accuracy deteriorates when target is changing lane
Solution Approach 1:
The system performs preliminary actions by accumulating detected objects over multiple scans before making a lane change determination. This preliminary data accumulation allows the system to establish a baseline of normal target position variations, which then enables more reliable detection of actual lane change intentions by comparing against this historical data.
Solution Approach 2:
The system dynamically adjusts the transverse position estimation by applying weight values to detected objects based on the determined lane change direction. This dynamic adjustment allows the estimation to adapt in real-time to the target's maneuver, improving accuracy during the critical lane change phase while maintaining reliability through continuous evaluation.
2Measurement precision
If radar signal reflection characteristics are used for target detection, then detection function is achieved, but transverse position measurement precision deteriorates
Solution Approach 1:
The signal processor segments the detected objects into multiple discrete detection points and evaluates each point's contribution to the overall transverse position estimation. By treating each detected object as a separate entity that can be individually weighted and evaluated, the system improves measurement precision while managing complexity through modular processing of discrete elements rather than treating the target as a single unit.
3Productivity
If traditional radar tracking is used for following target position and speed, then basic ADAS control is enabled, but acceleration and deceleration control performance deteriorates during lane change
Solution Approach 1:
The system implements feedback by continuously monitoring the target's detected objects across multiple scans and using this information to determine lane change direction. This feedback loop allows the system to adjust the transverse position estimation in real-time based on the target's actual behavior, improving ADAS control performance by accounting for lane change maneuvers that would otherwise degrade control accuracy.
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
Enhances the accuracy and reliability of lane change detection, enabling faster and more precise deceleration/acceleration control in ADAS systems.
Implementation Method 1
a transmitter configured to transmit a transmission signal, a receiver configured to receive a reception signal reflected from a target
Data Source
AI summary
Disclosed herein is a radar apparatus including a transmitter configured to transmit a transmission signal, a receiver configured to receive a reception signal reflected from a target, and a signal processor, wherein the signal processor detects one or more objects corresponding to one or more points reflected from the target, estimates a heading angle of the target based on the one or more detected objects, determines a lane change direction of the target based on the estimated heading angle, and corrects a transverse position of the target based on the determined lane change direction.