混沌背景下激光雷达弱信号频率估计  

Frequency estimation of lidar weak signal in chaotic background

作　　者：朱爱春[1] 孙文汇[1] 张小波[2] ZHU Aichun;SUN Wenhui;ZHANG Xiaobo(Qingdao Institute of Technology,Qingdao Shandong 266300,China;North China Sea Marine Technical Support Center,State Oceanic Administration,Qingdao Shandong 266300,China)

机构地区：[1]青岛工学院,山东青岛266300 [2]国家海洋局北海海洋技术保障中心,山东青岛266300

出　　处：《激光杂志》2021年第10期127-132,共6页Laser Journal

基　　金：山东省高校科技计划项目(No.J18KB167)。

摘　　要：激光雷达微弱信号通常被强噪声所掩盖,很难对幅值和频率做出检测,经常出现估计结果信号频率较低、误码率较高等问题,基于此提出一种混沌背景下基于单向耦合同步的弱信号频率估计方法。基于单向耦合混沌同步算法建立混沌信号系统模型,选取适当的误差系统与残余误差值,实现驱动系统与响应系统同步,从而完成最优混沌同步,得到最佳耦合系统。将混沌背景转换为同步误差下的弱信号频率估计问题,得到待测谐波信号的频率估计值。实验结果表明,所提方法计算过程简单有效,估计结果精准度较高,在混沌背景中含有强随机噪声的情况下,能够较好地估计出弱信号频率。The weak signal of lidar is usually covered by strong noise,so it is difficult to detect the amplitude and frequency. The problem of low signal frequency and high bit error rate often occurs in the estimation result. Based on this,a frequency estimation method of weak signal based on unidirectional coupling synchronization in chaotic background is proposed. Based on the unidirectional coupled chaotic synchronization algorithm,the chaotic signal system model is established,and the appropriate error system and residual error value are selected to realize the synchronization between the driving system and the response system,so as to complete the optimal chaotic synchronization and obtain the optimal coupling system. The chaotic background is transformed into a weak signal frequency estimation problem under synchronization error,and the frequency estimation value of the harmonic signal to be measured is obtained.The experimental results show that the proposed method is simple and effective,and the estimation accuracy is high. In the case of strong random noise in chaotic background,the proposed method can better estimate the frequency of weak signal.

关 键 词：频率估计 单向耦合混沌同步 最佳耦合系统 LORENZ系统 CHEN系统 

分 类 号：TN952.3[电子电信—信号与信息处理]