高测绘速率下合成孔径声呐孔径损失分析

Analysis of Aperture Loss of Synthetic Aperture Sonar at High Area

在收发分置和信号传播期间内平台横向移动的影响下,发射阵发射信号时与接收阵元接收信号时的方位向天线方向图之间存在一定间隔,从而导致合成孔径的损失。为度量合成孔径的损失情况,论文建立了孔径损失模型,分析了典型参数下发射阵在两端和中间时的有效合成孔径长度和距离上盲区特征,并对典型SAS系统的孔径损失和距离上盲区进行了仿真分析,最后提出了发射阵优化布置方案。

Under the influence of the separate transducers for transmission and reception and the motion of platform during signal propagation,there is a certain interval between the antenna pattern of transmitter when transmitting signal and that of receiver when receiving signal,which leads to the loss of synthetic aperture.In order to measure the loss of synthetic aperture,the aperture loss model is established in this paper.The characteristics of the effective synthetic aperture length and range blind area of the transmitter at both ends and in the middle are analyzed under typical system parameter.Then,the aperture loss and range blind area of typical SAS systems are simulated and analyzed.Finally,the optimal design scheme of transmitter position is proposed.