强干扰环境下高密传感器微弱信号调制仿真  

Modulation Simulation of Weak Signals in High-Density Sensors under Strong Interference Environment

作　　者：郑小荥 祁广群 ZHENG Xiao-ying;QI Guang-qun(Yunnan Tianye Chemical Co.,Ltd,Yunnan Wenshan Zhuang and Miao Autonomous Prefecture 663000,China)

机构地区：[1]云南天冶化工有限公司,云南文山壮族苗族自治州663000

出　　处：《计算机仿真》2025年第2期442-446,共5页Computer Simulation

基　　金：云南省科技项目(202000320001)。

摘　　要：由于环境中充斥着强烈的干扰信号,微弱传感信号被淹没其中,同时传感器网络的密集性也增加了信号处理的复杂性,使得微弱信号的识别和提取变得困难,导致在调制过程中容易失真,影响网络性能。以强信号全覆盖环境为背景,提出基于线性扩频的高密传感器微弱信号调制设计方案。运用数字锁定放大器分析噪声和信号的相关性,通过稀疏分解获取传感信号,引入Duffing振子与混沌系统优化锁定放大器性能,提取高密传感器微弱信号。使用局部均值分解消除传感器微弱信号趋势项,重构初始信号,明确微弱信号属性特征。在线性扩频下添加循环移位因子,计算扩频信号瞬时频率,将已调制扩频信号和本地扩频信号共轭相乘,离散化处理微弱信号,完成高密传感器微弱信号调制。研究结果表明:该设计方案在强信号全覆盖环境下具有较高的灵敏度和稳定性,有效实现微弱信号调制,适用于各种高密传感器应用场景。Due to the presence of strong interference signals in the environment,weak sensing signals are submerged,and the density of sensor networks increases the complexity of signal processing,making it difficult to identify and extract weak signals,resulting in distortion during modulation and affecting network performance.Under the background of strong signal full coverage environment,a design scheme of weak signal modulation for high-density sensors based on linear spread spectrum is proposed.The digital lock-in amplifier is used to analyze the correlation between noise and signal,and the sensor signal is obtained by sparse decomposition.Duffing oscillator and chaotic system are introduced to optimize the performance of the lock-in amplifier and extract the weak signal of high-density sensor.The local mean decomposition is used to eliminate the trend term of sensor weak signal,reconstruct the initial signal and clarify the attribute characteristics of weak signal.Under linear spread spectrum,the cyclic shift factor is added,the instantaneous frequency of spread spectrum signal is calculated,the modulated spread spectrum signal and local spread spectrum signal are conjugated and multiplied,and the weak signal is discretized to complete the weak signal modulation of high-density sensor.The research results show that the design scheme has high sensitivity and stability in the environment of full coverage of strong signals,effectively realizes weak signal modulation,and is suitable for various high-density sensor application scenarios.

关 键 词：信号全覆盖 高密传感器 微弱信号调制 信号提取 趋势项消除 

分 类 号：TN914[电子电信—通信与信息系统] TP391.9[电子电信—信息与通信工程]