MSB-CAATI算法在多波束测深系统中的应用

计算到达角瞬态成像技术(CAATI)是多角测深侧扫声纳(MSBSS)采用的高分辨方位、幅度联合估计技术。本文将CAATI技术扩展到多波束测深声纳(MBBS),提出了一种新的多子阵波束域CAATI(MSB-CAATI)算法。仿真实验证明了该算法与CAATI技术相比具有更高的估计精度和更低的分辨力门限。海试数据的处理验证了MSB-CAATI能很好地应用到多波束测深系统中,使其兼备了FT(傅氏变换)和CAATI各自的优点,能在整个条带宽度内同时获得高分辨力的海底地形和地貌信息,且不易受到低信噪比和复杂地形环境的影响。

Application of MSB-CAATI algorithm to multi-beam bathymetry system

CAATI technique is a high-resolution direction and amplitude estimation method used in multi-angle swath bathymetry sidescan sonar(MSBSS).This paper extends the CAATI technique to multi-beam bathymetry sonar(MBBS) and presents a new multiple sub-array beamspace-CAATI(MSB-CAATI) algorithm.Simulation shows that the method can achieve higher estimation accuracy and lower resolution threshold compared with CAATI.Processing of sea-experiment data verifies that MSB-CAATI can be applied to practical multi-beam systems.The method makes MBBS take ad-vantages of both Fourier transform and CAATI.It achieves both high-resolution bathymetric mapp-ing and backscatter acoustic imaging in the entire wide swath,and works well at relatively low SNR and complex acoustic environments or geometries.