摘要
基于波束形成方法的相控发射可以向不同方向以小延时连续高Ping率发射信号,由于海底底质分层结构的变化,在接收端极易发生回波信号混叠。提出了使用混沌序列克服这一问题,建立了混沌序列筛选流程及编码模型;分析了Logistic序列、Tent序列及Chebyshev序列的相关特性,确定了Chebyshev序列在三者中相关性能最好。使用Chebyshev序列进行调频生成序列,并进行了仿真和水池实验,验证了混沌调频编码信号对混叠信号具有良好的分离能力。
Phased transmission based on beamforming method can transmit signals in different directions with small delay and continuous high Ping-rate.Due to the change of the layered structure of seafloor sediments,the echo signal aliasing effect is easy to occur at the receiving end.In this paper,chaotic sequence is proposed to solve this problem,and the screening process and coding model of chaotic sequence are established.The correlation characteristics of Logistic sequence,Tent sequence and Chebyshev sequence are analyzed,and it is determined that Chebyshev sequence has the best correlation performance among them.Chebyshev sequence is used to generate frequency modulation sequence,and the simulation and pool experiments are carried out to verify the effective separation ability of chaotic frequency modulation coding signal to echo signal aliasing.
作者
郭英歌
陈晶晶
王润田
GUO Yingge;CHEN Jingjing;WANG Runtian(Shanghai Acoustics Laboratory,Chinese Academy of Sciences,Shanghai 201815,China)
出处
《声学技术》
CSCD
北大核心
2021年第6期763-767,共5页
Technical Acoustics
基金
中国科学院声学所英才计划(QNYC201827)。
关键词
混沌序列
混叠分离
相关性
深海探测
chaotic sequence
overlap separation
correlation property
deep sea exploration
