Signal Enhancement of Helicopter Rotor Aerodynamic Noise Based on Cyclic Wiener Filtering

The research on helicopter rotor aerodynamic noise becomes imperative with the wide use of helicopters in civilian fields. In this study, a signal enhancement method based cyclic Wiener filtering was proposed given cyclostationarity noise. adaptively filtered out by performing group frequency shifts input signal. According to characteristics noise, detection function constructed realize long-distance helicopters. flight data Robinson R44 obtained through field experiment and employed as object for analysis. range after increased from 4.114 km 17.75 km, verifying feasibility effectiveness method. efficacy demonstrated compared far-field test measurements helicopter.