Radar Sensor Angle Error Detection Using Velocity Scaling
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Solution Overview
Problem
Existing radar sensors in motor vehicles suffer from angle-dependent distortive measurement errors due to interference, such as coatings on the radome or improper installation, which are not adequately addressed by current methods.
Innovation Solution
An angle-dependent scaling method is applied to individual indicator values to detect and compensate for distortive angular errors, using scaling functions to generate an overall indicator that is largely independent of target distribution, allowing for improved accuracy and reliability of angle measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radar measurement methods are used, then the radar sensor can measure distance and velocity, but angle-dependent distortive measurement errors occur due to interference from coatings or improper installation
Solution Approach 1:
The patent applies feedback by using measured radial velocities and tracking angles to calculate individual indicator values, then using angle-dependent scaling to generate an overall indicator that feeds back into the measurement system to detect and compensate for distortive errors, continuously improving measurement precision
Solution Approach 2:
The patent changes parameters by introducing angle-dependent scaling factors that modify individual indicator values based on their angular deviation from the main beam direction, transforming the raw measurement data into corrected values that compensate for distortive errors
2Reliability
If individual indicator values are calculated for each target, then velocity deviations can be detected, but the indicator values remain dependent on target angular distribution
Solution Approach 1:
The patent applies parameter changes by introducing angle-dependent scaling factors that transform individual indicator values into scaled values, changing the parameter space to eliminate dependency on target angular distribution and produce an overall indicator independent of target distribution
3Measurement precision
If angle-dependent scaling is applied to individual indicator values, then an overall indicator independent of target distribution can be generated, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the overall error detection task into individual indicator values for each target, then processing each separately with angle-dependent scaling before combining them into an overall indicator, making the complex processing manageable and modular
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 method effectively detects and compensates for distortive angular errors, enhancing the accuracy and reliability of angle measurements in radar sensors, even when misalignment errors are present, by using scaling functions to derive an indicator value that is independent of target distribution.
Implementation Method 1
Evaluating the temporal change in phase at corresponding sampling points from ramp to ramp then yields additional independent information about the Doppler frequency (velocity) of targets or target reflections
Implementation Method 2
These are caused, for example, by the refraction of radar waves at unforeseen sources of interference, such as a coating (ice, snow, etc.) on the radar sensor
Data Source
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AI summary
The invention relates to a method for detecting angle measuring errors (Δφ) in an angular-resolution radar sensor (10) for motor vehicles, in which method the radial velocity (V_r) and at least one locating angle (φ,α) is measured for each stationary radar target (20) and an anticipated value for the radial velocity (V_r) is calculated using the measured locating angle and is compared with the measured value, characterized in that measurements of the radial velocities (V_r) and the locating angles (φ,α) are taken for one or more stationary targets (20), a single indicator value is calculated for each of said targets, which value indicates the deviation of the measured radial velocity from the anticipated radial velocity, the single indicator values are subjected to an angle-dependent scaling to compensate for the angular dependency of distortive angle errors, and an indicator for the angle measuring error is calculated from the scaled single indicator values.