声相关海流剖面仪测速研究

声相关海流剖面仪(ACCP)适合深海测速,能够测得相对海底的绝对速度。文章在前人工作基础上,以声纳方程为基础,构造海底混响回波仿真模型,并对基于K irchhoff近似和利用微扰法的R ay le igh-R ice近似相结合的散射模型赋予新的物理意义,并将其应用到声相关测速仿真研究过程中,使仿真更加接近于海洋的实际环境。文章利用H ilbert变换进行包络检波来减小测速误差,并且根据接收信噪比得到了不同航速时能够达到最大底跟踪的距离,这与参考文献给出的结果是一致的。

Velocity-Measuring Acoustic Correlation Current Profiler

The ACCP is potentially a very suitable speed log for use in the deep ocean,which having a bottom tracking capability for providing vessel absolute velocity.According to the field investigation and research results of predecessors,a model for seafloor reverberation simulation is found based on the sonar function.The Kirchhoff and Rayleigh-Rice approximation are combined by means of an interpolating function and a new physical significance is given in this paper. The scattering model applied to the velocity-measuring correlation sonar makes the results more exact.The method of elimination of error in velocity measurement is proposed by envelop estimation by Hilbert transformation.At the same time,the conclusion that the maximum range of bottom tracing for ACCP is gained due to SNR and different velocities is presented,which shows a good agreement with the available results obtained.