Adaptive Wiener Filter Based Numerical Filter with an Application to Beam Position Monitoring

摘要

This article proposes a numerical filter having an adaptive Wiener filter (AWF) as its main component. It presents detailed investigation of the performances of the Savitzky-Golay filter (SGF) and the AWF. As a result, the AWF is superior to the SGF in terms of less distortion of the filtered waveform. The desired signal fed to the AWF can be selectively generated by using a Butterworth filter, a Savitzky-Golay filter, and a downloaded waveform, respectively. User can easily choose filter's parameters to suit their applications via a user-interface module. The proposed filter is simple, rapidly computable, and efficient to suppress noise. An application to the Siam Photon Source (Synchrotron Radiation Unit on Thailand) is also described. The filters coded in C are listed in the appendices and downloadable from our web site.