Adjacent RPs Analytical solutions Bessel radiation distribution COSMO Channel-Picking Direction of Arrival (DOA) EMATs FDTD Fixed-Channel HIFU Helmholtz equation K-Means clustering KZK equation Kramers-Kronig relation Lamb waves MRI OFDM Principal Component Analysis (PCA) Pyramid Vector Quantization (PVQ) Rayleigh integral Research & information: general SAFE Two-stage matching UWA communication Westervelt equation Zone Plates acoustic echo acoustic emission acoustic field acoustic localization