Doppler Velocity Estimation of Overlapping Linear-Period-Modulated Ultrasonic Waves Based on an Expectation-Maximization Algorithm

Table 2

Estimation results for the three overlapping LPM ultrasonic echoes with 22 dB SNR.

LPM ultrasonic signals	First echo	Second echo	Third echo
Actual velocities (m/s)	4	3.5	2
	1	−2	5
	−4.5	3	−5
Estimated velocities (m/s)	4.05	3.6	2.05
	1	−2.1	5.1
	−4.45	3.1	−5.15