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ABSTRACTS | ABSTRACT DETAILS

 

Author:Nicolas Brachet
Institution:CTBTO PTS/IDC, Vienna International Centre, P.O. Box 1200, A-1400 Vienna, Austria
Email:Nicolas.Brachet@ctbto.org
Authors:Nicolas Brachet
Abstract Title:

"Infrasound Processing at the IDC using DFX-PMCC"
Abstract:

The International Data Centre (IDC) in Vienna is currently receiving and processing the data from 16 infrasound arrays of the International Monitoring System (IMS). For the purpose of software development and testing, the automatic detections from each infrasound array are monitored on a daily basis, and selected signals of interest are subjected to detailed analysis.

Two detection algorithms are run in parallel at the IDC. The first detector, DFX-libinfra, based on coherence and energy criteria is used in the Operations pipeline. The other detector, DFX-PMCC (Progressive Multi-Channel Correlation), based on cross-correlation and consistency criteria has been run in test mode for more than one year. Near real-time comparison of the two detection bulletins is very helpful in understanding and cataloguing the various sources of signals recorded at each infrasound array and evaluating the detection capability of the two different algorithms.

Further, during the last year, DFX-PMCC results have also been compared to those produced by WinPMCC (an up-to-date interactive version of PMCC algorithm) developed by DASE France and delivered to the IDC in 2002. The results of this comparison have been the correction and enhancement of the DFX-PMCC source code such that the two applications now produce very similar results. Some studies conducted at the IDC have also shown that configuration parameters like data quality control or array geometry have a significant impact on the detection processing.

As a result of this endeavour, a baseline configuration of DFX-PMCC could be determined for processing the data for all infrasound arrays. This baseline configuration has shown a very good detection capability, and the quality of the results has encouraged the IDC to move the upgraded DFX-PMCC software onto IDC testbed for testing.
Keywords:IDC detection algorithm DFX PMCC processing

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