Maximum entropy method spectral estimation applied to power cable diagnostics via cepstrum processing
✍ Scribed by Louis E. Roemer; C.S. Chen
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 390 KB
- Volume
- 310
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.
✦ Synopsis
The Cepstrum processing method has been used on power cables (1, 2) for determining regions of damage. The method consists of: (1) observing the spectrum of an original broad band signal source, (2) introducing the signal into the cable, (3) computing the change in the observed spectrum (as a result of ethos from regions of cable non-uniformity) when the signal is injected into the cable, and finally (4) computing the power-spectrum of the change in observed spectrum. A limitation of this technique is the use of band-limiting spectrum analyzers. Their limited bandwidth reduces range resolution estimation when used with the Fast Fourier Transform (FFT) technique. The maximum entropy method (MEM) is a more useful spectral estimator for this measurement technique. Examples are presented which show a comparison of the F+T and MEM techniques applied to practical cables.