水下航行器主动声呐波形生成技术实现与优化  

Realization and Optimization of Waveform Generation Technology for Active Sonar of Underwater Vehicles

作　　者：孙博昊 马晓川[1,2] 李璇 刘大鹏[1] 扶钰斌 SUN Bohao;MA Xiaochuan;LI Xuan;LIU Dapeng;FU Yubin(Laboratory of Autonomous Underwater Vehicles,Institute of Acoustics,Chinese Academy of Sciences,Beijing,100190,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院声学研究所水下航行器实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《网络新媒体技术》2023年第3期51-57,共7页Network New Media Technology

摘　　要：水下航行器在海洋工程与科学领域得到了越来越广泛的应用,针对不同的应用场景和需求,其声呐系统需要具有能够灵活调整发射波形参数的能力。直接数字频率合成(DDFS)技术具有快速的频率切换能力和较宽的信号可产生频率范围,是水下航行器主动声呐波形生成技术的基础。对其核心的相位—幅值数字信号生成电路,查找表方法具有移植性差、精度与容量相关等局限性,故采用FPGA芯片上实时解算结构。本文将区间压缩技术和合并旋转技术融合以加速CORDIC算法,提出了一种新的相位—幅值数字信号生成结构,提高了系统的计算效率且精度符合实际需求,同时在一定程度上摆脱了查找表方法的局限性合理规划。Underwater vehicle is an important carrier to undertake underwater acoustic countermeasure task.For different application scenarios and requirements,its sonar system needs the ability to flexibly adjust waveform parameters.Direct digital frequency synthesis(DDFS)is the basis of underwater vehicle active sonar waveform generation technology because of its fast frequency switching capability and wide frequency range.For its core phase-amplitude digital signal generation circuit,the look-up table method has the limitations of poor portability,accuracy and capacity correlation,so it uses real-time solution structure on FPGA chip.In this paper,interval compression technology and merging rotation technology are combined to accelerate CORDIC algorithm,and a new phase amplitude digital signal generation structure is proposed,which improves the calculation efficiency of the system and meets the actual requirements.At the same time,reasonable planning of FPGA on-chip resources is realized.

关 键 词：主动声呐 直接数字频率合成 波形生成技术 CORDIC算法 FPGA资源规划 

分 类 号：U666.7[交通运输工程—船舶及航道工程] U674.941[交通运输工程—船舶与海洋工程]