Radar Elevation Angle Calibration Using Rotating Corner Reflectors
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Solution Overview
Problem
Radar elevation angle uncertainty in autonomous vehicles leads to inaccurate detection of objects, as existing methods require mechanical adjustments or laser scanning, which are impractical when the radar is covered by vehicle materials.
Innovation Solution
A radar elevation angle measurement system using a series of corner reflectors with motor-controlled rotation and anechoic foam to reflect or absorb radar signals, allowing for automated data processing to determine the optimal pointing angle by analyzing signal reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical adjustments or laser scanning are used to measure radar elevation angle, then measurement capability is achieved, but the system becomes impractical when radar is covered by vehicle materials and requires complex mechanical modifications
Solution Approach 1:
The patent replaces mechanical adjustment systems and laser scanning equipment with a signal processing-based solution. Corner reflectors are used to generate known reflection patterns that are processed through the radar system, allowing elevation angle determination through signal analysis rather than mechanical measurement. This eliminates the need for complex mechanical modifications to the vehicle-mounted radar.
Solution Approach 2:
The patent introduces corner reflectors as intermediary objects between the radar and the measurement system. These reflectors serve as mediators that create known reflection patterns, enabling the radar to measure elevation angles indirectly through signal characteristics rather than direct mechanical or optical measurement. This intermediary approach allows measurement without modifying the radar's physical mounting or requiring line-of-sight access.
2Ease of manufacture
If radar is mounted on vehicle without modifications, then ease of installation is improved, but elevation angle measurement capability is lost due to coverage by vehicle materials
Solution Approach 1:
The patent replaces physical access requirements with signal-based measurement. Instead of requiring mechanical access to the radar for laser scanning or adjustment, the system uses corner reflectors and signal processing to determine elevation angles through electromagnetic wave interactions. This allows the radar to remain in its fixed, covered mounting position while still achieving measurement capability.
Solution Approach 2:
The patent changes the measurement approach from direct physical measurement to indirect signal characteristic analysis. By analyzing changes in signal reflection patterns, amplitude, and phase from corner reflectors at known positions, the system determines elevation angles without requiring physical access to the radar or modification of its mounting parameters.
3Measurement precision
If corner reflectors are used to measure elevation angle, then measurement capability is achieved, but the system requires automated rotation control and sequential positioning
Solution Approach 1:
The patent employs feedback mechanisms where the radar system receives reflection signals from corner reflectors at different angular positions, processes these signals to determine elevation angle information, and uses this feedback to identify the optimal pointing angle. The automated rotation and sequential positioning are controlled based on feedback from signal strength and pattern analysis, allowing the system to self-correct and optimize measurements.
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
Enables accurate determination of the radar's elevation angle without modifying the vehicle, improving object detection range and reliability by filtering noise and identifying peak signal values to correlate with the ideal pointing angle.
Implementation Method 1
transmit one or more signals towards a reflection structure comprised of individually controlled motors operable to rotate one or more corner reflectors
Implementation Method 2
A radar elevation angle measurement system using a series of corner reflectors with motor-controlled rotation and anechoic foam to reflect or absorb radar signals
Data Source
AI summary
Devices, systems, and methods are provided for radar elevation angle measurement. A radar elevation angle measurement system may transmit one or more signals from a radar towards a reflection structure comprised of individually controlled motors operable to rotate one or more corner reflectors. The radar elevation angle measurement system may receive echo signals at the radar from each of the one or more corner reflectors that sequentially transitioned to an ON position based on each of the one or more corner reflectors being sequentially rotated to be in an ON then an OFF positions. The radar elevation angle measurement system may collect data associated with the echo signals received from the one or more corner reflectors. The device may identify peak signal values based on the collected data. The radar elevation angle measurement system may calculate a radar pitch angle of the radar based on the peak signal values.