Radar Device Vertical Angle Peak Pairing
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Solution Overview
Problem
Radar devices mounted on vehicles fail to accurately distinguish between moving and still objects in the vertical plane, leading to erroneous tracking and potential malfunction of advanced emergency braking systems, especially when preceding vehicles pass under upper objects.
Innovation Solution
A radar device that transmits a frequency-modulated signal, processes peaks in the frequency spectra of reflected signals to differentiate between moving and still objects by analyzing the accuracy of peak pairing and distance changes, and corrects erroneous object tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the radar device does not calculate angles in the vertical direction, then the device complexity is reduced, but the measurement precision of object discrimination deteriorates
Solution Approach 1:
The patent transitions from two-dimensional peak detection to three-dimensional peak detection by incorporating vertical angle information. The determining unit identifies that when a first peak and second peak correspond to the same horizontal position but different vertical angles, and the distance decreases, this indicates erroneous tracking of upper objects. This dimensional addition resolves the contradiction by maintaining simple device structure while improving measurement precision through vertical dimension analysis.
2Ease of operation
If the radar device tracks objects without vertical angle analysis, then the ease of operation is improved, but the reliability of tracking deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the determining unit continuously monitors the relationship between first peaks and second peaks across multiple measurement cycles. When the distance to the tracked object decreases and vertical angle differences are detected, the system identifies erroneous tracking and corrects it. This feedback approach maintains ease of operation while significantly improving reliability by automatically detecting and correcting tracking errors.
3Productivity
If the radar device processes only single peaks, then the productivity is improved, but the measurement precision deteriorates
Solution Approach 1:
The patent applies partial action by selectively processing only those peak pairs that exhibit characteristics of erroneous tracking. The determining unit identifies specific conditions (distance decrease, vertical angle difference) that indicate errors, and only then performs additional peak correlation analysis. This approach avoids full reprocessing of all data while maintaining high measurement precision for problematic cases, thus balancing productivity and measurement precision.
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 effectively prevents the radar device from erroneously tracking upper objects as preceding vehicles, thereby preventing unnecessary braking and ensuring accurate vehicle control systems.
Implementation Method 1
A radar device is configured to transmit a transmission signal, and receive the transmission signal reflected from an object, as a reception signal, thereby detecting a target relating to the object.
Implementation Method 2
receive the transmission signal reflected from an object, as a reception signal
Implementation Method 3
transmit a transmission signal in which a transmission frequency varies in a predetermined cycle
Implementation Method 4
acquire peaks of frequency spectra of signals representing frequency differences between the transmission frequency and a reception frequency of the reception signal
Data Source
AI summary
There is provided a radar device. A signal processing unit is configured to: acquire first and second estimate peaks estimated as a first peak in a rising section and a second peak in a falling section; extract first and second history peaks existing in a predetermined range from the first and second estimate peaks. A determining unit is configured to determine that the signal processing unit has erroneously extracted the first peak corresponding to a still object as the first peak corresponding to a moving object, if an accuracy of pairing of the first history peak and a second object peak existing in a predetermined range apart from the first history peak by a predetermined distance is larger than an accuracy of pairing of the first and second history peaks in a situation where a distance between the radar device and the moving object decreases.


