Enhanced pseudo-dynamic receive beamforming using focusing delay error compensation

Dynamic receive beamforming updates focusing delays for every samples of a scanline, leading to increased hardware complexity. To reduce this, pseudo-dynamic receive beamforming is applied to divide scanlines into windows and each window shares the same focusing delays. However, only one sample in a window is in focus, while the rest are out of focus. This paper presents a method to enhance pseudo-dynamic receive beamforming by using linear least squares approximation of the focusing delay errors for every sample in a window in order to compensate for the delay errors of the out-of-focus samples. The method is preliminarily implemented on a single field-programmable gate array (FPGA) with 500K gates.