An improved speckle filtering method for weaken signal
Li Tan, Wang Wenbo · 2013
A New Filtering Method for Pulsar weaken signal In order to improve the denoising quality of the pulsar signal, a mode cell proportion shrinking denoising method is proposed based on empirical mode decomposing. Firstly, the pulsar signal is decomposed into a series intrinsic mode functions (IMFs), and the part between the two adjacent zero-crossing within IMF is defined as a mode cell. Then, treating mode cell as the basic unit of analysis and computing the optimal proportional shrinking factor of mode cell. Finally, the all mode cells within IMF are preceded by proportion shrinking, and the noise of IMF is suppressed. The experimental results show that, compared to SureShrink wavelet hard threshold method, BayesShrink wavelet hard threshold method, EMD mode cell threshold method, the proposed method can remove the pulsar signal noise more effectively, while preserving the useful detail information in the original signal better.