MIMO Radar Sensor Antenna Diagram Calibration
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Solution Overview
Problem
MIMO radar sensors experience systematic errors in angle estimation due to distortions in the antenna diagram caused by installation environments, such as vehicle bumpers, which cannot be accurately compensated for during factory calibration.
Innovation Solution
A method for calibrating the antenna diagram after commissioning, involving SIMO and MISO measurements to correct the transmitting and receiving control vectors based on comparison variables, allowing for post-calibration of the radar sensor to account for environmental distortions and age-related changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If factory calibration is performed before commissioning, then initial antenna diagram is established, but installation environment distortions cannot be compensated
Solution Approach 1:
The patent performs preliminary calibration actions during factory commissioning to establish baseline antenna diagrams, then supplements this with post-installation calibration measurements to capture installation environment distortions. This two-stage preliminary action ensures both initial setup and environmental adaptation are addressed.
Solution Approach 2:
The patent implements feedback mechanisms where calibration measurements are performed after installation, the results are used to update the antenna diagram, and this corrected diagram is then used for subsequent angle estimations. This closed-loop feedback ensures continuous improvement of measurement precision adapting to the specific installation environment.
2Measurement precision
If post-calibration is performed after commissioning, then installation distortions are compensated, but calibration time is extended
Solution Approach 1:
Essential calibration data is collected during factory commissioning as a preliminary action, establishing baseline antenna diagrams before installation. This reduces the amount of calibration work needed after installation, minimizing time loss while ensuring environmental distortions are still compensated.
Solution Approach 2:
The patent performs partial calibration during factory commissioning and completes the remaining calibration after installation. This partial action approach balances the trade-off by doing enough preliminary work to reduce post-installation time requirements, while completing necessary environmental adaptation calibration afterward.
Data Source
AI summary
Calibrating an antenna diagram of a MIMO radar sensor, including: before commissioning: storing an antenna diagram that associates with each of several angles a respective control vector that is made up of a transmitting control vector and a receiving control vector; after commissioning: performing a radar measurement to localize an object; checking whether the localized object is a single target or a multiple target; if single: performing a SIMO measurement with each of the transmitting antenna elements; estimating the angle of the object based on the measurement results; calculating a first comparison variable, dependent on the components of the transmitting control vector, for each transmitting antenna element; calculating a second comparison variable, dependent on the results of the SIMO measurements, for each transmitting antenna element; and correcting the transmitting control vector based on a known relationship between the first and second comparison variables for each transmitting antenna element.