Modeling and Simulation of Broadband Acoustic Doppler Current Profiler Echo

Broadband acoustics Doppler current profiler (BBADCP) uses the repeated phase-coded signal. It has higher range and velocity resolution, compared with narrow band acoustics Doppler current profiler (NBADCP). The character of BBADCP echo is different in different ocean environment. It is necessary to establish corresponding model for analyzing the effects of different echo on measurement precision. Therefore the broadband characteristic of BBADCP, scattering characteristic of scatterers and nonuniformity characteristic of scatterers are synthesized, and BBADCP echo model in the nonideal conditions is established. On this basis, digital simulation has been done, the influence brought by different characteristics of echo on the precision of velocity measurement is analyzed.