Research on Communication Interference Detection in Substations Based on CUSUM Algorithm
Aimed at the low efficiency of interference detection in substation communication,a detection scheme by improved CUSUM algorithm is proposed.Based on the sequential probability ratio in statistics,this method uses the nonparametric CU-SUM algorithm to cumulate the deviation,amplify the feature changes caused by interference and distinguish them.In order to adapt to interference attacks and the uncertainty of channel conditions,sliding window and adaptive threshold algorithm are added to realize real-time interference detection.The improved CUSUM algorithm is used to detect the received signal in the time domain,analyze the change process of the cumulative graph,and compared with N-sigma and Z-score detection methods.The simulation results show that the detection effect of the proposed method is obviously better than the two,and its false a-larm rate and missed detection rate are 4.0％and 5.3％respectively,which can sensitively detect the time when interference occurs,and effectively improve the system interference detection efficiency.
万方数据
维普
