Application of Digital Filters and the Fourier Transform to the Analysis of Ballistic Data

摘要

Special numerical techniques are described which permit productive utilization of digital filters in the analysis of ballistic data. Specific examples are given which demonstrate the use of these techniques. In the analysis of ballistic data such as pressure, strain, and acceleration, and the Fourier spectrum is an extremely useful tool. For nonreal-time data analysis, various numerical manipulations can be performed to enhance the applicability of Fourier techniques. These manipulations include odd periodic continuation, linear interpolation, and multiple-pass digital filter applications. While several less than successful examples have been presented, one can nonetheless conclude that Fourier analysis is applicable even in the presence of nonstationary frequencies. It can also be used to isolate aperiodic phenomena such as baseline variations.