新媒体背景下精密激光测距弱信号检测方法研究  

Research on weak signal detection method of precise laser ranging in the background of new media

作　　者：袁智勇[1] 占文信[1] 刘耀光[1] YUAN Zhiyong;ZHAN Wenxin;LIU Yaoguang(Nanchang Institute of Technology,Nanchang 330000,China)

机构地区：[1]南昌理工学院,南昌330000

出　　处：《激光杂志》2021年第7期50-54,共5页Laser Journal

基　　金：国家自然科学基金(No.61861067)。

摘　　要：新媒体信息传播过程中,微弱有用的信号通常会被环境噪声所湮灭,特别针对短时低能量瞬变信号,利用传统信号处理方法难以获取准确位置信息。为此提出新媒体背景下精密激光测距弱信号检测方法研究。综合考虑环境因素影响,从光学、硬件与软件三个模块设计精密激光测距系统结构,分析信号检测基本步骤,确定检测相关函数,判断相同随机过程前后存在的相关性;利用非线性小波变换方法,获取离散函数,计算含噪信号的正交小波变换,得到分解系数,实现初始信号去噪;采用混沌Duffing振子阵列构建微弱信号检测方程,引入变尺度系数,明确检测时需满足的条件,完成弱信号检测。仿真结果表明,该方法检测到的信号信噪比较高,对弱信号定位更加准确。In the process of new media information transmission,weak and useful signals are usually annihilated by environmental noise.Especially for short-time low-energy transient signals,it is difficult to obtain accurate position information by using traditional signal processing methods.In this paper,the weak signal detection method of precision laser ranging under the background of new media is proposed.Considering the influence of environmental factors,the structure of precise laser ranging system is designed from three modules of optics,hardware and software.The basic steps of signal detection are analyzed,and the detection correlation function is determined to judge the correlation before and after the same random process.The discrete function is obtained by using nonlinear wavelet transform method,and the orthogonal wavelet transform of noisy signal is calculated to obtain the decomposition coefficient The initial signal de-noising;using chaotic Duffing oscillator array to build weak signal detection equation,introducing variable scale coefficient,clear detection conditions to complete weak signal detection.The simulation results show that the signal-to-noise ratio detected by this method is high,and the weak signal location is more accurate.

关 键 词：新媒体背景 精密激光测距 弱信号检测 小波变换 DUFFING振子 

分 类 号：TN249[电子电信—物理电子学]