DOA Estimation of Distributed mmWave Radar System via Fast Iterative Adaptive Approach
Wenqiang Wei, Ruitao Liu, Xianxiang Yu, Qinghui Lu, Guolong Cui, Xueli Fang, Lei Zhang · 2021 International Conference on Control, Automation and Information Sciences (ICCAIS) · 2021
In this paper, we propose a fast algorithm based on iterative adaptive approach to address the DOA estimation for the distributed mmWave radar system under the challenging conditions of a single snapshot and coherent sources. In order to improve angular resolution, let each transmit sensor emit the same signal in time-sharing to construct a large aperture virtual array. We first roughly derive azimuth angles with one mmWave radar using conventional beamforming. Then, resorting to iterative adaptive approach, we search for the accurate DOA estimations within a very small region based on the estimated azimuth to improve computational efficiency and angular resolution. Finally, numerical simulation results are provided to demonstrate superior performance of the proposed algorithm over some counterparts.