In-Vehicle Radar Direction Error Detection Using Theoretical Curves
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Solution Overview
Problem
Radar apparatus installed in a vehicle's bumper experiences disturbances in radiation characteristics due to multiple reflections of electromagnetic waves, leading to deterioration in detecting the direction of objects.
Innovation Solution
A method and apparatus for detecting direction errors caused by these disturbances, which involves relative speed calculation, direction estimation, theoretical curve calculation, and error correction using a continuous wave radar system, allowing for improved direction detection accuracy without requiring additional devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna is installed in the bumper, then the radar apparatus can be compact and integrated into the vehicle, but multiple reflections of electromagnetic waves occur causing deterioration in direction detection accuracy
Solution Approach 1:
The patent pre-calculates theoretical curves representing the relationship between relative speeds and directions for stationary objects before actual detection. These theoretical curves serve as reference data to correct direction detection errors caused by bumper reflections, allowing the system to compensate for the installation environment's adverse effects in advance
Solution Approach 2:
The system compares actual direction detection results with the pre-calculated theoretical curves and uses the discrepancies (direction errors) to correct future detections. This feedback mechanism continuously improves direction detection accuracy by learning from the difference between expected and actual measurements
2Measurement precision
If direction error detection and correction is implemented, then direction detection accuracy is improved, but additional processing steps and calculations are required
Solution Approach 1:
The theoretical curves are pre-calculated and stored before actual operation, converting complex real-time calculations into simpler lookup and comparison operations. This reduces the processing burden during actual direction detection while maintaining high accuracy through the use of pre-computed reference data
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 suppresses direction detection errors caused by antenna radiation characteristic disturbances, enhancing the detection accuracy of the radar system by correcting estimated directions using a direction correction table.
Implementation Method 1
a radar apparatus which is installed in a vehicle and detects obstacles in the surroundings of the vehicle... by transmitting and receiving the continuous wave
Implementation Method 2
relative speeds with respect to an object which reflected the continuous wave are acquired, by frequency analysis of signals
Data Source
AI summary
A method of detecting direction errors of an object, applied to an in-vehicle radar apparatus, whereby in a first step, relative speeds of an object reflecting a continuous wave are obtained by executing frequency analysis of signals acquired by transmitting and receiving the continuous wave. In a second step estimated directions, which are values of estimated directions in which the object is present, are calculated for each of respective frequency bins in which the presence of the object has been confirmed by the frequency analysis executed in the first step. In a third step a theoretical curve is calculated which expresses a relationship between relative speed of a stationary object and directions in which the stationary object is present, with respect to the own vehicle. In a fourth step, the direction errors are obtained as errors of the estimated directions with respect to the theoretical curve.