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A Novel Generalized Nested Array MIMO Radar for DOA Estimation with Increased Degrees of Freedom and Low Mutual
Zhongtian Yang1, Zhengyang Bi2, Ye Chen3
1School of Energy and Power Engineering, Beihang University, Beijing 102200, China.
Sensors (Basel, Switzerland)
|June 27, 2024
Summary
This study introduces a novel Generalized Nested Array MIMO radar to overcome mutual coupling issues in direction of arrival estimation. The new design enhances accuracy and angle resolution, even with closely spaced sensors.
Area of Science:
- Array signal processing
- Radar systems engineering
- Electromagnetic sensing
Background:
- Mutual coupling between sensors degrades Direction of Arrival (DOA) estimation accuracy in array signal processing.
- Existing Multiple-Input Multiple-Output (MIMO) radar designs often neglect the impact of mutual coupling, limiting performance.
- Closely located sensors in MIMO radar exacerbate mutual coupling effects, posing challenges for precise signal analysis.
Purpose of the Study:
- To propose a novel Generalized Nested Array MIMO (GNA-MIMO) radar configuration.
- To address and mitigate the adverse effects of mutual coupling on DOA estimation in MIMO radar systems.
- To enhance the degrees of freedom (DOFs) and improve angle resolution in radar sensing.
Main Methods:
- Utilized a Generalized Nested Array (GNA) for the transmitter array.
- Introduced an expansion factor into the nested array design for the receiver array.
- Derived closed-form expressions for sensor positions and achievable consecutive DOFs.
- Conducted simulation experiments to validate the proposed GNA-MIMO radar's performance.
Main Results:
- The proposed GNA-MIMO radar configuration achieves O(N^4) consecutive DOFs with N sensors.
- The design effectively mitigates the detrimental effects of mutual coupling, even with closely spaced sensors.
- Simulation results demonstrate superior accuracy in DOA estimation and enhanced angle resolution compared to conventional methods.
Conclusions:
- The novel GNA-MIMO radar effectively overcomes the limitations imposed by mutual coupling in DOA estimation.
- The proposed array configuration offers significant improvements in terms of degrees of freedom and resolution.
- This advancement provides a more robust and accurate solution for direction of arrival estimation in challenging radar environments.
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