一种基于FFT波束形成的BDI算法分析研究

A BDI Algorithms Analysis Based on FFT Beam-form Technique

多波束条带测深仪是进行海底地形测绘的主要设备 ,该设备的信号处理部分所要完成的主要任务就是精确测量测深点目标回波的 DOA (Direction of Arrival)和 TOA (Tim e of Arrival)。研究了基于 FFT波束形成技术的 BDI(Bearing Diviation Indicator)算法 ,该算法可完成对海底回波信号的时间和方向的联合估计。通过计算机仿真工作和海试数据的处理 ,得出结论 :FFT波束形成技术可以有效地提高波束形成的数目 ;BDI可以精确地对海底回波信号进行回波时延估计和方向估计 ,尤其是 BDI算法可以提高非镜向海底区域的边缘波束的测量精度 [1 ] [2 ] 。

This paper discusses a bearing deviation indicator (BDI) algorithm based on FF T beam-form technique, which can estimate the time of arrival (TOA) and the dire ction of arrival (DOA) By computer simulation and the data processing of sea t rials, a conclusion is drawn: FFT beam-form technique can increase the number of beam-form effectively; the BDI algorithms can precisely estimate the TOA and DO A in seabed, especially, and improve the accuracy of edge beams in non-mirror se abed