MIMO Radar Beamforming With Cross-Correlation Signal Separation
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Solution Overview
Problem
Conventional radar systems using SDM-MIMO transmission signals face challenges in demultiplexing reception signals and performing transmission Digital Beam Forming (DBF) and Direction of Departure (DOD) estimation due to correlated transmission waves interfering with each other.
Innovation Solution
A radar device that includes signal reception, transmission signal acquisition, unnecessary signal suppression, cross-correlation operation, and beam formation circuitry to process and estimate target direction using cross-correlation values, effectively suppressing unnecessary signals and forming beams even with SDM-MIMO transmission signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional multipath suppression methods are applied to SDM-MIMO transmission signals, then multipath waves can be suppressed, but transmission waves from multiple antennas interfere with each other and cannot be demultiplexed
Solution Approach 1:
The patent segments the reception signal processing into separate channels corresponding to each transmission antenna. By dividing the mixed reception signal into individual antenna channels through cross-correlation processing, the system can independently process signals from each transmission antenna, enabling demultiplexing while maintaining multipath suppression capability.
Solution Approach 2:
The patent introduces cross-correlation processing as an intermediary step between receiving the mixed signal and extracting individual transmission antenna signals. This intermediary processing layer enables the system to separate correlated transmission waves by finding cross-correlations between transmission waves and reception signals, resolving the interference problem.
2Productivity
If transmission waves from multiple antennas are transmitted simultaneously, then transmission speed is improved through SDM-MIMO, but correlated transmission waves interfere with each other
Solution Approach 1:
The patent converts the harmful interference between correlated transmission waves into a beneficial feature by utilizing cross-correlation processing. Instead of treating the interference as a problem to be eliminated, the system uses the correlation characteristics to identify and extract individual transmission antenna signals from the mixed reception signal, turning the interference into a key identifier for signal separation.
Solution Approach 2:
The patent creates copies of transmission wave signals by receiving them through multiple transmission signal acquisition antennas. These copies serve as reference signals for cross-correlation processing, enabling the system to distinguish between correlated transmission waves and extract individual antenna contributions accurately.
3Reliability
If transmission Digital Beam Forming is performed, then target detection performance is improved, but DOD estimation becomes difficult when transmission waves are correlated
Solution Approach 1:
The patent segments the beam formation process into separate operations for each transmission antenna by using cross-correlation results. This segmentation allows the system to perform transmission DBF for improved detection while simultaneously extracting DOD information from the cross-correlation data, resolving the conflict between detection performance and direction estimation.
Solution Approach 2:
The patent introduces cross-correlation values as an intermediary that bridges transmission DBF and DOD estimation. These cross-correlation values serve as a common resource that enables both beam formation for detection and direction extraction, allowing both functions to operate simultaneously without interference.
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 transmission DBF and DOD estimation by receiving and processing transmission waves with suppressed unnecessary signals, improving target detection performance and direction estimation accuracy.
Implementation Method 1
signal reception circuitry to receive a transmission wave transmitted from each of the transmission antennas by using a reception antenna
Implementation Method 2
cross-correlation operation circuitry to calculate a cross-correlation value between the transmission signal replica and the reception signal
Implementation Method 3
unnecessary signal suppression circuitry to suppress a first signal obtained by giving, to the transmission signal replica, a propagation delay time of the transmission wave
Implementation Method 4
beam formation circuitry to form a beam and estimate a direction of the target by using the cross-correlation value corresponding to the transmission signal
Data Source
AI summary
A radar device includes a signal reception unit that acquires reception signals of transmission waves transmitted from transmission antennas, a transmission signal acquisition unit that receives transmission waves transmitted from the transmission antennas by using transmission signal acquisition antennas, and acquires received reception signals as transmission signal replicas, an unnecessary signal suppression unit that suppresses unnecessary signals of the reception signals acquired by the signal reception unit, a cross-correlation operation unit that calculates cross-correlation values between the transmission signal replicas and the reception signals including the suppressed unnecessary signals, and a beam formation unit that forms beams and estimates a direction of a target by using cross-correlation values corresponding to the respective transmission signals.