投弃式仪器数据传输信道时频响应求解方法  

The calculation of transient and frequency response for vessel carried expendable measuring instruments channel

作　　者：刘宁[1,2] 张如彬[1] 金杰[1] 

机构地区：[1]天津大学电子信息与工程学院,天津300072 [2]国家海洋技术中心,天津300112

出　　处：《电波科学学报》2016年第5期1009-1015,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(41206031)

摘　　要：针对传输函数求解船载投弃式仪器信道分布参数模型误差较大的问题,提出了一种求解其数据传输信道时频响应的方法.时域响应采用时域有限差分(Finite Difference Time Domain,FDTD)法,求得信道上任意位置的时域响应,频域响应采用BLT(Baum-Liu-Tesche)方程结合电磁拓扑理论,对信道的关键节点进行频域分析.最后测试了信道的时频域波形,并与理论仿真结果进行对比,结果表明:在仪器的工作频率内,理论仿真与试验结果一致,为进一步地研究终端电路的设计及传输方案的改进提供了理论基础.When we use the transmission function or the electromagnetic analytic software to analyze the expandable measuring instruments transmission channel distributed parameter model,a certain amount of errors will occur.This paper presents a method to analyze the channel transient and frequency response based on finite difference time domain（FDTD）method and Baum-Liu-Tesche （BLT）equation.For the transient response analysis,an improved FDTD method is presented to analyze transient response in any location of channel with arbitrary terminal loads.For the frequency response analysis,the BLT equation is coupled with the thoughts of electromagnetic topology to analyze the frequency response in the node of transmission channel.Furthermore,the channel transient and frequency response are compared with the experimental measurement,and the test results are consistent with the theoretical results in the frequency range.It shows that in the channel working frequency range,the theoretical analysis is feasible for channel transient and frequency response analysis and thus can provide guidance for design of the matching circuit and improve the accuracy of transmission scheme.

关 键 词：投弃式仪器 信道分布参数 时域有限差分法 BLT方程 时频响应 

分 类 号：TN766[电子电信—电路与系统]