Radar Signal Processing Using Eigenvector Correlation Matrices
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Solution Overview
Problem
Distributed array radar configurations improve angular resolution but increase beam side lobes, causing reflected waves from multiple targets to be buried, leading to failure in separate detection of targets with varying reception intensities.
Innovation Solution
A radar apparatus with a transmitting array antenna and a receiving array antenna, utilizing a signal processing unit that separates reception signals, calculates correlation matrices, and detects targets using eigenvectors to evaluate and separate signals from multiple targets while maintaining angular resolution and preventing beam side lobe degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a distributed array antenna is used to improve angular resolution, then angular resolution is improved, but beam side lobes increase causing targets to be buried
Solution Approach 1:
The patent segments the received signal into multiple independent channels corresponding to different transmitting antennas. By processing each channel separately through correlation matrix calculation and eigenvector analysis, the system can distinguish targets that would otherwise be buried in side lobes, while preserving the angular resolution benefits of the distributed array configuration.
Solution Approach 2:
The patent changes the signal processing parameters by using eigenvector-based detection instead of conventional beamforming. This parameter change allows the system to maintain the angular resolution improvement from distributed array configuration while suppressing the harmful beam side lobes that cause target burial.
2Productivity
If MIMO radar technology is applied to form transmission multibeam, then search efficiency is improved, but beam side lobes increase causing failure to detect low intensity targets
Solution Approach 1:
The patent segments the MIMO radar signals into separate transmission channels and processes each channel's received signal independently. This segmentation allows the system to maintain the search efficiency benefits of multibeam formation while reliably detecting low-intensity targets by analyzing each channel through correlation matrix and eigenvector methods.
Solution Approach 2:
The patent implements feedback through correlation matrix calculation that uses the received signals to determine spatial characteristics. This feedback mechanism allows the system to adjust its detection approach based on the actual signal environment, maintaining both search efficiency and detection reliability even when beam side lobes are present.
3Measurement precision
If distributed array configuration is used, then angular resolution is improved, but multiple targets arriving from different directions cannot be separately detected
Solution Approach 1:
The patent segments the received signal into multiple independent channels, each corresponding to a different transmitting antenna. By processing each channel separately through correlation matrix calculation and eigenvector analysis, the system can separate and detect multiple targets arriving from different directions, preserving the angular resolution improvement while solving the target separation problem.
Solution Approach 2:
The patent adds a new dimension to signal processing by using eigenvector analysis in the spatial domain. This dimensional approach allows the system to separate targets based on their spatial characteristics, enabling detection of multiple targets from different directions while maintaining the angular resolution benefits of the distributed array configuration.
Data Source
AI summary
A radar apparatus includes a transmitting array antenna that transmits signals orthogonal to one another from a plurality of transmitting antennas, a receiving array antenna that receives the signals reflected from a target by a plurality of receiving antennas, and a signal processing unit that detects the target from reception signals received by the plurality of receiving antennas. The signal processing unit includes a correlation matrix calculation unit that determines a first correlation matrix corresponding to the transmitting array antenna and a second correlation matrix corresponding to the receiving array antenna, on the basis of the reception signals separated by a separation unit, and a detection unit that detects the target on the basis of an evaluation value calculated using eigenvectors of the first correlation matrix and the second correlation matrix.