An Exploration To A Few Issues About Weak Signal Detection And Processing

In this paper,the theory of sparse decomposition is introduced to weak signal detection,and the improved matching pursuit(MP) algorithm is studied to accomplish anti-interference process of some typical signals.The novel Particle Swarm Optimization(PSO) algorithm is used to improve the efficiency of searching for time-frequency atoms,thereby achieving high search efficiency of time-frequency atoms and rapid noise restraint.The results of experiments indicated that the improved algorithm can effectively increase the searching speed by approximately 100 times and reduce the noises above SNR -15.On the other hand,the advancedΣ-ΔAD converter and the USB2.0controller CY7C68013 are adopt to research the multiplex high-precision data acquisition system with power frequency rejection.It has been proved that in the application to the transformer substations' grid-grounding detection the system can realize multiplex high-precision data acquisition and power frequency interference rejection effectively by a large number of stimulants and on-site tests.