Wavelet analysis application for remote control room operation
Oleg I. Semenov, I.B. Semenov · Review of Scientific Instruments · 2003
Compression algorithm for data transfer from tokamak installation to remote control room was developed on the basis of wavelet analyses. The algorithm is useful in the case of low speed Internet channel (∼20 kbytes/s) for real time express analysis of row noisy data between shots (i.e., ∼5–10 times compression of the initial row data array (∼50–100 Mbytes), transmission, restoration, and analysis in time interval ∼15 min). The developed algorithm is based on some amount of data losses so that the amplitude and phase difference between the initial and restored data were less then 5% to signal amplitude. The algorithm was tested for Mirnov signal transmission in the case of disruption instability. It was shown that the error of restoration does not depend on form of the signal, i.e., applied method has good characteristics both in the case of the spikes and smooth functions. Experiments show that the coefficient of compression 5–15 could be achieved if the errors are in 0.5%–5%.