Downloads: 111

Files in This Item:
File Description SizeFormat 
a43b1p11.pdf848.17 kBAdobe PDFView/Open
Title: SATARN微小地震データの伝送遅延時間の短縮について沖電気製微小地震テレメータ装置のデジタル出力データ利用
Other Titles: Reduction of Transmission Delay Time in the Seismic Data Exchanging Procedure of the SATARN System
Authors: 大見, 士朗  kyouindb  KAKEN_id
中川, 渥  KAKEN_name
Author's alias: OHMI, Shiro
Keywords: 微小地震観測網
SATARN system
Data exchange with JMA
Transmission delay time reduction
WIN system
Issue Date: 1-Apr-2000
Publisher: 京都大学防災研究所
Journal title: 京都大学防災研究所年報. B
Volume: 43
Issue: B-1
Start page: 103
End page: 114
Abstract: 京都大学防災研究所の微小地震観測網(SATARN)の, データ伝送遅延時問の短縮を図るシステムの開発を行なった。現在運用中の微小地震テレメータ装置のデジタル出力データを使用し, IBMPC/AT互換仕様のコンピュータに, UNIXOSの一つであるFreeBSDを搭載したシステムを構築した。このシステムを試験的に運用した結果, 従来は30秒程度以上だった伝送遅延時間を5秒程度にまで短縮することに成功した。また, 観測点でA/D変換されたデジタルデータをそのまま扱うことにより, 観測所内における電気ノイズ汚染の影響が除去され, 高品質のデータが得られるようになった。
A new seismic wave data relaying system for SATARN was developed. It transmits seismic wave datafrom OKITEC4000 seismic telemetry system into TCP/IP computer network with WIN format within5 seconds delay. It is used to exchange seismic wave data with JMA for their real time data processing.An IBM PC/AT compatible single board computer and several parallel I/O modules are assembled intoa system. A GPS clock that generates BCD coded time signal is used to attach time stamp to the WIN format seismic wave data. The FreeBSD, which is a free PC-UNIX, is used as the operating system. This system enables us to reduce the transmission delay time to less than 5 seconds, while it was more than30 seconds in the old system. High quality seismic wave data is also available with this system since only digitized wave form data is handled. In the old system, an A/D conversion procedure was equipped and thus the data was easily contaminated by electric noise in the observatories.
Related Link:
Appears in Collections:No.43 B-1

Show full item record

Export to RefWorks

Export Format: 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.