摘要
Abstract
[Objective]When analyzing the nonlinear mutation frequency interference problem in all optical communication net-works,interference detection mainly relies on estimating channel covariance directly,without expanding network communication signal transformation processing,resulting in low F1-score values of the detection results.Therefore,a nonlinear abrupt frequen-cy interference detection algorithm based on finite difference time domain is proposed for all-optical communication networks.[Methods]We collect all optical communication network traffic data by combining packet capturing and mirroring methods,fol-lowed by cleaning,conversion,and protocol processing.Relying on the working principle of finite difference time-domain meth-od,we first describe the time width and bandwidth of the signal in time-domain and frequency-domain space.Then we apply de-rivative and Fourier transform algorithm to transform the real-time collected network communication signal.Next,we use the transformed signal to analyze the nonlinear abrupt frequency interference.Finally the transformed signal is detected and analyzed.With the aid of the time-frequency joint feature analysis method,the time-domain and frequency-domain features of the interfer-ence signal are extracted.Relying on the back propagation algorithm and the minimization of the loss function,the detection pro-cess of nonlinear abrupt frequency interference is simplified.The characteristic distance function is used to replace the network loss function,and it is input into the interference recognition model based on the twin network to obtain the detection results of nonlin-ear abrupt frequency interference.[Results]The experimental results show that under different noise conditions,the F1-score value of the proposed algorithm's nonlinear mutation frequency interference detection results remains above 0.95.The detection time is less than 40 ms.[Conclusion]The new detection method using the finite difference time-domain method can more accu-rately reflect the interference situation of the current communication network.It ensures the normal operation of the communica-tion network,and meets the interference detection requirements of all-optical communication network.关键词
全光通信网络/非线性突变频率干扰/时域有限差分/通信信号/信号变换/干扰检测Key words
all optical communication network/nonlinear mutation frequency interference/finite difference time domain/commu-nication signal/signal transformation/interference detection分类
信息技术与安全科学
