Shipborne HFSWR Direction-Finding Method for Target Detection Based on Correction Matrix

Because of the influence of various factors, such as platform motion, antenna error, clutter, and noise interference, the direction finding (DF) of targets using shipborne high-frequency surface wave radar (HFSWR) becomes extremely difficult, which poses challenges for locating vessels at sea. To achieve more accurate DF for shipborne HFSWR, this letter proposes a method based on correction matrices, dividing the factors that cause DF errors into two categories: platform motion and interference from other sources. After calculating two corresponding correction matrices, a two-step correction is performed on the steering vector of the array to reduce DF errors. Field data experiments validate the performance of the correction matrix-based method for DOA estimation.