Vehicle Radar Azimuth Interval Velocity Filtering
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Solution Overview
Problem
Vehicle radar systems face challenges in accurately determining relative velocity between a host vehicle and objects due to distortions caused by the wheels and tires, which create additional Doppler effects not related to the relative velocity difference between the host and target vehicles.
Innovation Solution
A vehicle radar system that generates and transmits radar signals, receives reflected signals, and calculates the difference between minimum and maximum radial velocities for various azimuth angle intervals, selecting intervals where the difference exceeds a threshold to omit measurement points affected by wheel-related Doppler effects, thereby estimating a more stable relative velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar signals are used to detect objects in the blind spot, then the presence of obstacles can be detected, but distorting radar detections occur from wheels and tires creating additional Doppler effects
Solution Approach 1:
The patent segments the measurement data by dividing the azimuth angle range into multiple intervals and analyzing radial velocity within each interval. This allows identification and exclusion of specific measurement points affected by wheel-related Doppler effects while retaining valid measurements from other intervals, thus resolving the contradiction between detection reliability and measurement precision.
Solution Approach 2:
The patent applies local quality by treating different azimuth angle intervals differently based on their characteristics. Measurement intervals affected by wheel Doppler effects are identified and excluded, while intervals with valid measurements are retained for relative velocity calculation. This selective approach ensures high measurement precision is maintained for valid data while avoiding distortion from problematic sources.
2Productivity
If all measurement points are used to calculate relative velocity, then more data is available for calculation, but measurement points affected by wheel Doppler effects introduce bias in the calculated relative velocity
Solution Approach 1:
The patent divides measurement points into segments based on azimuth angle intervals and evaluates each interval independently. This segmentation enables efficient identification and exclusion of only those measurement points affected by wheel Doppler effects, rather than discarding all data or using complex filtering methods, thus maintaining calculation efficiency while improving precision.
Solution Approach 2:
The patent applies partial action by selectively including only valid measurement intervals in the relative velocity calculation, excluding those affected by wheel Doppler effects. This approach uses sufficient data to maintain calculation efficiency while avoiding the excessive inclusion of biased measurements, achieving optimal balance between productivity and 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 system provides a more stable and reliable relative velocity difference between the host and target vehicles, effectively filtering out additional Doppler effects from wheel movements, enhancing the accuracy of radar detection.
Implementation Method 1
a vehicle radar system arranged to generate, transmit and receive reflected radar signals
Implementation Method 2
The radial velocity and the azimuth angle between the direction of observation and the direction of movement of the host vehicle are determined for a large number of measurement points
Data Source
AI summary
A vehicle radar system (3) including at least one transceiver arrangement (7) arranged to generate, transmit and receive reflected radar signals (4, 5) where the transmitted radar signals (4) have been reflected by an object (6 and 8). The radar system (3) is arranged to provide azimuth angle (θ) and radial velocity (vr) for a plurality of measurement points (9) at such objects (6 and 8). The radar system (3) is arranged to calculate a difference between a minimum radial velocity (Vmin′, Vmin″) and a maximum radial velocity (Vmax′, Vmax″) for the measurement points (9) for a plurality of azimuth angle intervals, and to select those azimuth angle intervals (ΔθA, ΔθB) where the difference exceeds a certain threshold.