A High-Resolution DOA Estimation Method Based on the Subarray Combination Configuration

The paper proposes a direction of arrival(DOA) estimation method based on the subarray combination. The method utilizes the beamforming design and the spatial filtering on a specified spatial region by partitioned and overlapping subarrays in the array to suppress interference signals and improve the signal-to-noise ratio (SNR) of the desired signal. By applying the spatial spectral estimation methods to the outputs of each subarray, the DOA estimation of the desired signal is implemented based on the positional relationship between the subarrays. Simulation experiments demonstrate that compared to the conventional spectral estimation methods, the DOA estimation method based on the subarray combination effectively reduces the impact of interference and noise signals on the DOA estimation. As a result, the accuracy and anti-interference capability of the signal direction finding in complex electromagnetic environments are further improved.