Reduction of Transmission Delay Time in the Seismic Data Exchanging Procedure of the SATARN System

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  • 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
  • SATARN ビショウ ジシン データ ノ デンソウ チエン ジカン ノ タンシュク ニ ツイテ オキ デンキセイ ビショウ ジシン テレメータ ソウチ ノ デジタル シュツリョク データ リヨウ

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Abstract

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.

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