The invention relates to the technical field of radio long wave communication technology, and specifically relates to an extremely-
ultra low frequency channel
atmosphere noise suppression method based on variance median filtering. The extremely-
ultra low frequency channel
atmosphere noise suppression method based on variance median filtering includes the steps: constructing a multi-reference magnetic vector
sensing system, synchronously receiving extremely-
ultra low frequency signals through multi channels, and obtaining a magnetic induction output sampling point matrix X; according to the channel sampling
point sequence, grouping X, estimating the variance of each group, and obtaining the variance matrix D; based on a large number decision criterion, performing pulse detection and two-stage adaptive median filtering on D; according to output of the second stage median filtering and input of the first stage median filtering, performing
sequence reconstruction, and obtaining an output matrix Y; and performing
power frequency harmonic interference and remaining
atmosphere noise suppression on Y. As the extremely-ultra
low frequency channel atmosphere
noise suppression method based on variance median filtering taking the variance of the sampling point group as input of the adaptive
median filter, the impulsiveness is improved. As the extremely-ultra
low frequency channel atmosphere
noise suppression method based on variance median filtering determines the pulse state of each element of the variance matrix based on the large number decision criterion, the pulse detection accuracy is improved and the defect that the performance is low when the median filtering is in the local
high density pulse noise condition in the traditional method.