The occurrence of an overlapping signal is a significant problem in performing multiple objects localization. Doppler velocity is\nsensitive to the echo shape and is also able to be connected to the physical properties of moving objects, especially for a pulse\ncompression ultrasonic signal. The expectation-maximization (EM) algorithm has the ability to achieve signal separation. Thus,\napplying the EM algorithm to the overlapping pulse compression signals is of interest. This paper describes a proposed method,\nbased on the EM algorithm, of Doppler velocity estimation for overlapping linear-period-modulated (LPM) ultrasonic signals.\nSimulations are used to validate the proposed method.
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