This arithmetic setup four cycle standard ultrasonic polar signal, and correlated with the ultrasonic received signal. Then the distributing instance can be educed.

In this paper, it is proved that the polar signal obtained from the symbolization of an ergodic random signal is stationary and that the autocorrelation function of the polar signal is ergodic.

Focus matrix is constructed by polar decomposition of location matrix and transforms signal subspace at different frequency bins to signal subspace at focusing frequency bin.