PSK脉冲编码降低瑞利散射型光纤传感系统相干瑞利噪声的理论和仿真研究  

Theoretical and Simulation Research on Reducing Coherent Rayleigh Noise of Rayleigh Scattering Optical Fiber Sensing System by PSK Pulse Coding

作　　者：王磊[1,2,3] 李永倩[1,2,3] 张立欣 范海军[1,2,3] WANG Lei;LI Yongqian;ZHANG Lixin;FAN Haijun(Department of Electronic and Communication Engineering,North China Electric Power University,Baoding Hebei 071003,China;Hebei Key Laboratory of Power Internet of Things Technology,North China Electric Power University,Baoding Hebei 071003,China;Baoding Key Laboratory of Optical fiber sensing and optical communication Technology,North China Electric Power University,Baoding Hebei 071003,China)

机构地区：[1]华北电力大学电子与通信工程系,河北保定071003 [2]华北电力大学河北省电力物联网技术重点实验室,河北保定071003 [3]华北电力大学保定市光纤传感与光通信技术重点实验室,河北保定071003

出　　处：《传感技术学报》2024年第7期1223-1229,共7页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(62205105,52177141,62171185,61775057);河北省自然科学基金项目(F2019502112,E2020502010);中央高校基本科研业务费专项基金项目(2019MS086,2017MS112);河北省科技计划项目(SZX2020034)。

摘　　要：频移平均(Frequency Shift Averaging,FSAV)技术是目前降低相干瑞利噪声(Coherent Rayleigh noise,CRN)的最主要方法,然而其降噪效果会受到频率漂移和脉冲啁啾效应的影响,且不适合应用在高空间分辨率系统中。针对以上问题,提出一种利用相移键控(Phase Shift Keying,PSK)脉冲编码降低CRN的新方法。详细分析了该方法的原理,仿真验证了该方法的有效性和适用性。结果表明:该方法不仅能有效降低CRN,且能在高空间分辨率下完全适用,为基于瑞利散射的高空间分辨率高精度分布式光纤传感系统中CRN的降低提供了新的视角和实用方法。The frequency-shift averaging(FSAV)technique is currently the most important method to reduce coherent Rayleigh noise(CRN).However,its noise reduction effect will be affected by frequency drift and pulse chirp effect,and it is not suitable for high spatial resolution systems.Targeting at the above problems,a new method is proposed to reduce CRN by using phase shift keying(PSK)pulse coding.The principle of the method is analyzed in detail,and the effectiveness and applicability of the method are verified by simulation.The results show that the method can not only effectively reduce the CRN,but also be fully applicable in high spatial resolution.The method proposed provides a new perspective and practical method for the reduction of CRN in high spatial resolution optical fiber sensing systems based on Rayleigh scattering.

关 键 词：相干瑞利噪声 频移平均技术 PSK 脉冲编码 多编码序列 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]