Aiming at problem of low practicality of existing ultrasonic echo parameter estimation method for ultrasonic detection

improve preprocessing for ultrasonic echo signal and reduce the amount of data processing

an improved method is proposed based on Gauss model for ultrasonic echo and expectation maximization（ EM）algorithm. The new algorithm can not only overcome shortcoming and improve convergence speed of EM algorithm

but also achieve a higher precision. Numerical simulation and application experiment are carried out to verify effectiveness of the method. Simulation and experimental result shows that the proposed method can not only ensure the detection precision but also improve computing speed and practicality of algorithm.