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Low-Complexity MUSIC-Based Direction-of-Arrival Detection Algorithm for Frequency-Modulated Continuous-Wave Vital
Bong-Seok Kim1, Youngseok Jin1, Jonghun Lee1
1Advanced Radar Technology Laboratory, Daegu Gyeongbuk Institute of Science & Technology (DGIST), Daegu 42988, Korea.
Sensors (Basel, Switzerland)
|August 6, 2020
Summary
This study introduces a low-complexity Direction-of-Arrival (DOA) algorithm for vital radars. It reduces computational load by intelligently selecting sensor channels, achieving over 40% complexity reduction with comparable performance.
Area of Science:
- Radar Signal Processing
- Array Signal Processing
Background:
- Direction-of-Arrival (DOA) estimation is crucial for radar systems.
- Conventional Multiple-Signal-Classification (MUSIC) algorithms offer high accuracy but suffer from high computational complexity.
- Frequency-Modulated Continuous-Wave (FMCW) vital radars require efficient DOA estimation for applications like human activity monitoring.
Purpose of the Study:
- To propose a novel, low-complexity MUSIC-based DOA detection algorithm for FMCW vital radars.
- To significantly reduce the computational complexity of DOA estimation without compromising performance.
- To enhance the practical applicability of DOA algorithms in resource-constrained vital radar systems.
Main Methods:
- The algorithm utilizes the Fast Fourier Transform (FFT) for initial coarse DOA estimation.
- It adaptively selects the number of sensor channels for the MUSIC algorithm based on the coarse DOA estimate.
- Channel selection leverages the trade-off between Field of View (FOV) and resolution by effectively altering array element spacing.
Main Results:
- Achieved over 40% reduction in computational complexity compared to conventional MUSIC algorithms.
- Demonstrated comparable DOA estimation performance to the standard MUSIC algorithm.
- Successfully distinguished adjacent DOAs in experimental tests within a practical environment.
Conclusions:
- The proposed algorithm offers a significant complexity reduction for DOA estimation in FMCW vital radars.
- It maintains high accuracy and the ability to resolve closely spaced targets.
- This low-complexity approach makes advanced DOA estimation more feasible for vital radar applications.
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