基于Lorenz混沌调频的水下正交波形集设计  

Design of underwater orthogonal waveforms set based on Lorenz chaos frequency modulation

作　　者：田晶[1] 陈航[1,2] 唐镜治 滕舵[1,2] 

机构地区：[1]西北工业大学航海学院,陕西西安710072 [2]水下信息处理与控制国家重点实验室,陕西西安710072

出　　处：《声学技术》2017年第2期116-122,共7页Technical Acoustics

基　　金：水下信息处理与控制国家重点实验室基金资助项目(9140C230304140C23001)

摘　　要：针对网络水下航行器组联合探测情况下各网络节点间信号会互相干扰的问题,基于Lorenz混沌模型,提出一种混沌调频(Chaos Frequency Modulation,CFM)的正交波形集设计方法。首先建立基于Lorenz序列的CFM信号模型,对其进行相关特性分析和正交特性研究,包括CFM正交波形集的个数和波形长度对波形集正交性能的影响,提出对混沌序列进行加窗函数处理的CFM波形集正交性优化方法;然后构造网络水下航行器组分别发射线性调频(Linear Frequency Modulation,LFM)信号和CFM信号的回波模型,对比分析了匹配滤波器对回波信号的处理结果。仿真结果表明,该设计方法简便、灵活、高效,产生的CFM正交波形集性能良好,且相对于常规信号在水下信号检测方面具有明显的优势。A method based on Lorenz chaos frequency modulation is proposed to design orthogonal waveform sets for the joint detection of the network underwater vehicles where the interferences may exist between echo signals. First, the CFM （chaos frequency modulation） signal model based on Lorenz sequence is established, and its correlation properties and orthogonal performance are analyzed, including the effects of the number and the length of waveforms on the or- thogonal performance. The optimization method of the CFM orthogonal waveforms by adding window function to the chaotic sequence is proposed. And then, the echo signal model based on the network group of underwater vehicle that transmits linear frequency modulation signal and CFM signal is structured, and the processing results of the echo signals by using matched triter are compared and analyzed. The simulation results indicate that the method is simple, flexible and efficient, producing a set of orthogonal waveforms with good performances, which has obvious advantage in un- derwater information detection.

关 键 词：混沌序列 频率调制 正交波形集 网络水下航行器 

分 类 号：TN911.7[电子电信—通信与信息系统]