浅水多波束高帧率测深技术研究

Technology of the multi-beam high frame rate bathymetry in shallow water

针对常规多波束测量中由于远距离目标信号未到达接收基阵而不能再次发射探测信号,导致测深帧率下降的问题,本文提出了基于Kasami编码的浅水多波束高帧率测深方法。首先讨论了频分复用高帧率测深方法、基于Kasami编码的并行高帧率测深方法和串行高帧率测深方法的原理,然后通过仿真对比了三种方法的条带间干扰和测深分辨力性能,对比结果表明基于Kasami编码的串行高帧率测深方法的条带间干扰较低,具有较高的测深分辨力。最后采用浅水宽覆盖多波束测深系统进行了水池实验验证,结果表明该方法在保证测量分辨力的情况下,可有效的提高测量帧率。

Because probe signals can＇t be re-launched before remote target signals reach receiving array in the conventional multi-beam measurement, which results in the problems of decrease of bathymetry frame rate, the method of multi-beam high frame rate in shallow water is proposed on the basis of Kasami encoding. Firstly, it analyzes the FDM high frame rate bathymetry method, and the method of parallel high frame rate bathymetry based on Kasami encoding as well as the theory of serial high rate bathymetry. Subsequently, according to simulation, inter-band disturbance and performance of bathymetry resolution are compared among these three methods. Final analysis shows that serial high rate bathymetry method on the basis of Kasami encoding possesses lower inter-band disturbance capability and higher bathymetry resolution. Finally, simulation and tank experimental verification are finished based on the MBES（Multi-beam echo sounder）. The result shows the method can effectively increase measurement frame rate while guaranteeing measurement resolution.