Abstract
During the development of gas turbine engines, a wide variety of engine parameter measurements are necessary using many different measuring transducers. Signals from these transducers are subjected to an array of sophisticated signal processing techniques, among them being Signal Spectrum Analysis. Of great concern to the person using this technique is protection from spectrum aliasing. This phenomenon occurs during the FFT analysis of sampled data unless adequate precautions are taken. Under the proper conditions, however, aliasing can be used to produce results which are otherwise difficult or impossible to obtain. This paper presents two situations in which intentional aliasing can be beneficial in the processing of sampled data. The first of these allows the analyst to achieve any desired degree of spectral resolution without the use of unusual or possibly unavailable signal processing equipment. The second shows a method by which the difficult problem of relating phenomena which are sensed at different frequencies by rotating and stationary transducers can be handled.
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