Paper  Title  Page 

MOPWO086  Open XAL Status Report 2013  1076 


Funding: ORNL/SNS is managed by UTBattelle, LLC, for the U.S. Department of Energy under contract DEAC0500OR22725 XAL is the well established, accelerator physics high level application programming framework developed for and used at the Spallation Neutron Source in Oak Ridge National Lab. Due to interest from other accelerator labs, the Open XAL project was formed in 2010 to port XAL to be more suitable for collaboration. The Open XAL architecture along with the objectives, status and roadmap of this effort are presented in this paper. 

MOPWO087  Parameter Estimation of the Exponentially Damped Sinusoid for Noisy Signals  1079 


Funding: ORNL/SNS is managed by UTBattelle, LLC, for the U.S. Department of Energy under contract DEAC0500OR22725 The damped sinusoid equation is a common model for many scientific processes involving damped periodic signals. Here we present two methods for estimating the damped sinusoid parameters for noisy signals. Both methods are based upon an exact, closed form solution to fit the parameters for signals without noise, and they estimate the parameters for the noisy signals by the statistical maximum likelihood criterion. The first method relies on an optimizer to minimize the mean square signal error. The second method estimates the parameters by direct calculation and is suitable when the signal noise is small and the frequencies are sufficiently far from the integer and half integer values. 
