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In order to improve accuracy of the time-of-flight using cross-correlation function maximum, parameter estimation method is used to calculate peak position of model impulse response function which is the flow noise parameter model. Parameter h in the model is constantly revised in this algorithm. The numerical τ₀ is obtained when the algorithm is convergent. The multi-core processors OMAP3530 is the main controller for the system. The tasks of the random signal acquisition, man-machine interface and communication interface driving are accomplished in ARM. The parameter estimation method program is achieved by DSP. Thus real-time performance of the system is improved. The experimental data show that, it has high precision by using the parameter estimation method to obtain τ₀. It has certain engineering application prospects.