利用波束散射模型分析BBADCP的性能

Performance of a broadband acoustic Doppler current profiler that uses a beam scattering model

为了对宽带声学多普勒流速剖面仪(BBADCP)所接收的海洋体积混响信号进行分析,提出了模拟水体环境散射的波束散射模型,并对BBADCP所接收的宽带回波信号进行了仿真.通过对仿真信号的分析,说明了波束散射模型的正确性.基于波束散射模型以及仿真回波信号,采用脉冲对算法进行了BBADCP的流速估计并分析了估计性能.性能分析说明了层厚、流速以及信噪比等因素对BBADCP流速估计的影响情况.这为进一步研究和分析声学多普勒测流提供了理论工具和仿真手段.

A beam scattering model was proposed to analyze volume reverberation signals received by a broadband acoustic Doppler current profiler （BBADCP）. Broadband signals for the BBADCP were also simulated. Analysis showed the validity of the beam scattering model. Based on the beam scattering model and simulated signals, the Pulse-Pair method was applied and Monte Carlo statistics were generated to analyze estimation performance. Statistical analysis showed that performance was mainly affected by cell range, current velocity and the signal to noise ratio （SNR）. So the model is both a useful theoretical tool and a simulation method aiding further research and analysis of BBADCP based measurements.