Time-frequency analysis of time-varying spectra with application to rotorcraft testing

The time-dependent spectrum of rotating structures presents many significant challenges to radar cross section (RCS) test design, instrumentation parameter selection, signal-processing methodology, data analysis, and data interpretation. This paper presents a multidimensional signal-processing tool and a suite of associated data products, based on an efficiently scripted test design and execution strategy, which are responsive to the high throughput, high data volume requirements, and real-time data analysis demands associated with rotorcraft testing. We specifically address the NRTF's realization of a suite of spectral, cepstral, and statistical signal-processing tools supported by animation that facilitate near-real-time parametric data analysis and interpretation.