Vehicle Speed Calculation Using Target-Aware Radar Correction
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Solution Overview
Problem
Conventional vehicle speed calculation devices face issues with deteriorating correction accuracy due to the relatively rough angular resolution of radar sensors in the vertical direction, particularly when targets are upper objects, leading to inaccuracies in detection angles.
Innovation Solution
A vehicle speed calculation device that determines whether a target is an object on the road or an upper object based on radar sensor power, calculates positional relationships using the radar's detection results, and adjusts vehicle speed corrections accordingly, employing different correction coefficients based on the target type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar sensor is used to detect the vertical detection angle of upper objects, then the relative speed and positional relationship can be calculated, but the detection accuracy deteriorates due to rough angular resolution in the vertical direction
Solution Approach 1:
The patent applies local quality by differentiating between two target types (objects on road vs. upper objects) and applying different calculation methods for each. For objects on the road, the system uses installation height of the radar sensor; for upper objects, it uses vertical detection angle. This localized differentiation allows the system to optimize measurement precision for each specific case while maintaining overall reliability.
Solution Approach 2:
The system changes the parameter used for positional relationship calculation based on target category. When the target is an object on the road, the installation height parameter is used; when the target is an upper object, the vertical detection angle parameter is used. This parameter change allows the system to work around the limitation of rough vertical angular resolution by selecting the more reliable parameter for each scenario.
2Device complexity
If the radar sensor detects targets with rough vertical angular resolution, then the device complexity is reduced, but the measurement precision of vertical detection angle deteriorates
Solution Approach 1:
The patent makes the radar sensor multi-functional by using it for both horizontal and vertical detection, and by applying different calculation approaches based on target type. The same radar sensor serves multiple purposes: detecting objects on the road using installation height and detecting upper objects using vertical detection angle. This universality allows the system to maintain simple device complexity while handling the precision issue through intelligent processing.
3Device complexity
If the vehicle speed correction is applied uniformly for all targets, then the calculation process is simplified, but the correction accuracy deteriorates for upper objects
Solution Approach 1:
The patent applies local quality by implementing different vehicle speed correction degrees based on target category. The correction is not uniform but is locally optimized: higher correction degree for objects on the road where the measurement is more reliable, and lower correction degree for upper objects where the measurement has larger errors. This localized differentiation maintains calculation simplicity while significantly improving correction 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
The device effectively suppresses deterioration in vehicle speed correction accuracy by enhancing corrections when targets are on the road, thereby improving overall accuracy.
Implementation Method 1
a relative speed of the fixed target with respect to the vehicle that is detected by the radar sensor
Implementation Method 2
a vertical detection angle of the fixed target that is detected by the radar sensor
Data Source
AI summary
The vehicle speed calculation device includes a target category determination unit, a vehicle speed calculation unit, a positional relationship calculation unit, and a vehicle speed correction unit. The positional relationship calculation unit calculates the positional relationship between the vehicle and the fixed target in a height direction. The vehicle speed correction unit increases, when the target is an object on a road, degree of correction of the vehicle speed using the relative vehicle speed compared to when the target is an upper object.