"The development of technologies for utilizing a network of atmospheric infrasound sensors to monitor compliance with a Comprehensive Nuclear-Test-Ban Treaty (CTBT) is currently underway. Detection and localization capabilities are required for achievement of an effective monitoring system. The dynamic nature of the atmosphere, the uncertainties involved in characterizing high-altitude temperatures and winds, and the long ranges over which infrasound signals propagate combine to make accurate predictions of infrasound propagation difficult. Reliable models are needed in order to predict infrasound propagation paths from potential event locations worldwide. Existing model implementations can be difficult to use and neglect dynamic atmospheric effects. In this effort, propagation modeling techniques and sources of atmospheric data were reviewed, and models and databases deemed most suitable for application to infrasound monitoring were selected for incorporation in an integrated software tool kit. The software called InfraMAP, for Infrasonic Modeling of Atmospheric Propagation, was developed to support the CTBT researcher and analyst. The software includes three types of high-fidelity propagation models: ray tracing, normal modes, and parabolic equation (PE); it also includes two empirical models of the global atmosphere that include temporal effects: a horizontal wind model, and a temperature/density model. Enhancements to the existing propagation models were also implemented to improve the functionality of the software. Algorithms were developed for assessing variability in propagation parameters, specifically travel time and arrival azimuth, based on perturbations to mean wind profiles." Note: This document has been added to the Homeland Security Digital Library in agreement with the Project on Advanced Systems and Concepts for Countering WMD (PASCC) as part of the PASCC collection. Permission to download and/or retrieve this resource has been obtained through PASCC.
Advanced Systems and Concepts Office, Report Number 1999 005
Public Domain. Downloaded or retrieved via external web link as part of the PASCC collection.
ASCO/PASCC Archives via NPS Center on Contemporary Conflict