合成孔径声纳成像改进距离-多普勒算法研究  

Research on Modified Range-Doppler Algorithm of Synthetic Aperture Sonar Imaging

作　　者：范乃强[1] 王英民[1] 

机构地区：[1]西北工业大学培训中心,陕西西安710072

出　　处：《计算机仿真》2014年第10期25-29,共5页Computer Simulation

基　　金：国家自然科学基金支助项目(51309191)

摘　　要：在合成孔径声纳成像优化的研究中,传统距离-多普勒算法主要应用于窄带窄波束信号合成孔径成像,而在合成孔径声纳领域,由于信号带宽较大,波束较宽,使得成像效果较差。研究了经典距离-多普勒算法的原理,提出了其局限性,针对合成孔径声纳的宽带宽波束信号特点改进了传统算法。放弃窄带信号条件下的Fresnel近似,利用更精确的适用于宽带宽波束信号的距离双曲线模型对算法进行了推导,并在推导结果的基础上对成像区域中任意点目标上进了仿真。仿真结果表明,改进算法具有更高的分辨率和适中的运算量,比传统距离-多普勒算法更适合应用在合成孔径声纳成像中。The conventional R - D algorithm is always applied in synthetic aperture imaging field of narrowband and narrow beam signal. However, the imaging effect is greatly inferior in field of synthetic aperture sonar due to broadband and wide beam signal. We studied the mechanism of classical algorithm and analyzed its limitation. We also improved the R - D algorithm in consideration of the broadband and wide beam underwater acoustic signal. Un- der the condition of abandoning the Fresnel assumption, we has deduced the algorithm under condition of more accu- rate range hyperbolic model and utilized the result to make performance simulation to arbitrary point target in imaging area. The simulation results show that the modified R - D algorithm has higher resolution and acceptable computa- tion, it is concluded that the modified algorithm is more suitable to synthetic aperture sonar than conventional R - D algorithm.

关 键 词：合成孔径声纳 距离-多普勒算法 水声信号 宽带信号 

分 类 号：TP721[自动化与计算机技术—检测技术与自动化装置]