Radar Mutual Coupling Correction via Inverse Matrices
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Solution Overview
Problem
In millimeter-wave radar systems, significant mutual coupling between antennas leads to inaccurate phase information and incorrect orientation estimation, particularly in MIMO systems where both transmission and reception antennas experience disturbances, affecting detection accuracy.
Innovation Solution
A radar apparatus is designed with a transmission antenna unit and a reception antenna unit arranged in a virtual array, where a processor corrects virtual reception signals by multiplying them with the inverse matrices of the reception and transmission mutual coupling matrices, reducing the effects of mutual coupling and improving orientation detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase difference information is used for orientation estimation, then orientation detection capability is improved, but mutual coupling between antennas causes phase information to become inaccurate
Solution Approach 1:
The patent measures and utilizes the mutual coupling characteristics between antennas to create correction matrices. By characterizing the harmful coupling effects and applying their inverse through matrix multiplication, the system converts the previously harmful phase distortions into corrected accurate phase information for orientation estimation.
Solution Approach 2:
The patent changes the parameter representation by introducing correction matrices that transform the received signal phases. Through matrix multiplication with the inverse of the coupling matrix, the system transforms distorted phase parameters into corrected phase parameters that accurately reflect target orientation.
2Measurement precision
If multiple transmission and reception antennas are used to form a virtual array, then detection capability is improved, but mutual coupling effects increase and disturb reception signals
Solution Approach 1:
The patent measures the mutual coupling characteristics between all transmission and reception antennas and creates separate correction matrices for transmission and reception sides. By applying the inverse of these correction matrices to the virtual reception signals, the system eliminates the harmful coupling disturbances while preserving the beneficial virtual array detection capability.
3Loss of information
If orientation estimation is performed using reception signals from multiple antennas, then orientation information is obtained, but signal disturbance from mutual coupling prevents correct estimation
Solution Approach 1:
The patent transforms the distorted signal parameters by multiplying the virtual reception signal matrix by the inverse correction matrices. This parameter transformation converts unreliable distorted phase information into reliable corrected phase information that accurately represents target orientation.
Data Source
AI summary
A transmission antenna unit includes a plurality of transmission antennas, a reception antenna unit, and a processor. The plurality of transmission antennas that are arranged in a row along a predetermined array direction. The reception antenna unit includes a plurality of reception antennas that are arranged in a row along the array direction. The plurality of transmission antennas and the plurality of reception antennas form a virtual array in which a plurality of virtual reception antennas are arranged in a row along the array direction. The processor corrects a plurality of virtual reception signals by multiplying a virtual reception signal matrix by an inverse matrix of a reception mutual coupling matrix and an inverse matrix of a transmission mutual coupling matrix.