Accession Number:

ADA231107

Title:

Intelligent Array System

Descriptive Note:

Final rept.

Corporate Author:

SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA

Report Date:

1990-10-01

Pagination or Media Count:

178.0

Abstract:

This report presents a detailed description of the major product of this project, a computer hardwaresoftware system called the Intelligent Array System IAS. The IAS processes data from two high-frequency arrays NORESS ARCESS in Norway to detect, locate and identify seismic events. The IAS computers and functions are distributed between the NORSAR Data Anlaysis Center NDAC near Oslo and the Center for Seismic Studies Center in Arlington, VA. The IAS modules at NDAC automatically retrieve data from a disk buffer, detect signals, compute signal attributes amplitude, slowness, azimuth, polarization, etc., and store them in a commercial relational database management system DBMS. IAS makes scheduled e.g., hourly transfers of the data to separate DBMS at the Center. Arrival of new data automatically initiates a knowledge- based system KBS which interprets these data to locate and identify earthquake, mine blast, etc. seismic events. This KBS uses general and area- specific seismological knowledge represented in rules and procedures. For each event, unprocessed data segments e.g., 7 minutes for regional events are retrieved from NDAC for subsequent display and analyst review. The interactive analysis modules include integrated waveform and map displaymanipulation tools for efficient analyst validation or correction of the solutions produced by the automated system. Another KBS compares the analyst and automatic solutions to mark overruled elements of the knowledge base. Performance analysis statistics guide subsequent changes to the knowledge base so it improves with experience.

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE