One or more systems, methods, or computer program products can include receiving an echo data set including information representative of an echo sensed by a transducer, provided at least in part by one or more actual targets included in a region of interest. The region of interest can be modeled, including selecting or generating an array manifold matrix including information corresponding to any one or more candidate targets. The weights of the candidate targets can be determined using the array manifold matrix and the echo data set, including minimizing an argument of a function modeling the weights of the candidate targets. In an example, the echo data set can be dithered, such as by adding a specified dithering signal.