收稿日期:2022-05-28.基金项目:国家重点研发计划项目(2018YFB2101002).*通信作者:谢婷玉E-mail:792999496@qq.com光电技术及应用DOI:10.16818/j.issn1001-5868.2022052803基于改进正交匹配追踪的FBG传感信号处理方法郭享1,黄治龙1,谢婷玉2*(1.苏州市轨道交通集团有限公司,江苏苏州215008;2.中国电科芯片技术研究院,重庆400060)摘要:针对光纤布拉格光栅(FBG)传感信号易受外界噪声干扰从而导致信号丢失的问题,提出了一种改进型正交匹配追踪(OMP)算法。围绕FBG传感信号波长随应力漂移的本质特征,在压缩感知理论的框架下,通过去除稀疏系数中的虚部,并利用指数饱和法对非零元素进行拟合与排序,从而获取FBG信号的有效稀疏度。在此基础上,通过改进经典OMP算法迭代过程中的原子选择策略与终止条件,有效降低算法复杂度并提高信号的重构精度。对比实验结果表明,所提出的算法在时间复杂度、信噪比与信号重构精度等方面均具有突出的优势。关键词:光纤布拉格光栅;正交匹配追踪;压缩感知;稀疏度中图分类号:TN253文章编号:1001-5868(2023)01-0141-06FBGSignalProcessingMethodwithImprovedOrthogonalMatchingPursuitGUOXiang1,HUANGZhilong1,XIETingyu2(1.SuzhouRailTransitGroupCo.,Ltd,Suzhou215008,CHN;2.CETCAcademyofChipsTechnology,Chongqing400060,CHN)Abstract:Animprovedorthogonalmatchingpursuit(OMP)algorithmisproposedtosolvesignallossproblemofthefiberBragggrating(FBG)sensingsignalwithexternaldisturbances.BasedontheessentialcharacteristicsofthewavelengthdriftofFBGsensingsignalswithstress,withintheframeworkofcompressivesensingtheory,theeffectivesparsityofFBGsignalwasobtainedbyremovingtheimaginarypartofsparsitycoefficientandapplyingexponentialsaturationmethodfittingandrankingthenon-zeroelements.Moreover,byimprovingtheatomselectionstrategyandtheterminationconditionsintheiterationprocessofthetraditionalOMPalgorithm,thecomplexityofalgorithmwasreducedandthereconstructionaccuracyofthesignalwasimproved.Theresultsofthecomparativeexperimentsdemonstratethattheproposedalgorithmhasoutstandingadvantagesontimecomplexity,signalnoiseratio(SNR)andreconstructionaccuracy.Keywords:fiberBragggrating;orthogonalmatchingpursuit;compressivesensing;sparsity0引言光纤布拉格光栅(FBG)传感器具有体积...
