Author Topic: ALOS:Switching to the Redundant Data Relay SatelliteCommunication Equipment  (Read 2115 times)

Online jacqmans

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                     ***  JAXA MAIL SERVICE  ***
                 Japan Aerospace Exploration Agency
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             Advanced Land Observing Satellite "Daichi":
Switching to the Redundant Data Relay Satellite Communication Equipment
and Emergency Observations of the Solomon Islands Following Earthquake

                                                   April 9, 2007 (JST)
                             Japan Aerospace Exploration Agency (JAXA)

At around 2:26 p.m. on April 5, 2007 (Japan Standard Time, JST, (all
date and times hereinafter are in JST,) the observation data relay
from the Advanced Land Observing Satellite "Daichi" to the Data
Relay Satellite "Kodama" was interrupted.  The "Daichi" was launched
in January 2006 by the Japan Aerospace Exploration Agency (JAXA.)

JAXA investigated the situation based on already acquired telemetry
data, and at around 5:00 p.m. on April 8 the transmission system of
the Daichi onboard data relay satellite communication equipment was
switched to the redundant system to restore normal operations. We are
continuing to study the cause of this phenomenon.

Observation data acquisition during the data transmission
interruption was continuously performed by direct transmission
between the Daichi and ground stations without relays.  During that
direct transmission period, at around 8:38 a.m. on April 8, JAXA
conducted an emergency observation of the Solomon Islands Region. As
a result of the data analysis, we were able to acquire image data of
the areas stricken by the Solomon Island Earthquake.  (Please refer
to the attachment.)

Attachment: Emergency Observation on the Solomon Islands Earthquake
http://www.jaxa.jp/press/2007/04/20070409_daichi_e.html#at01

This page URL:
http://www.jaxa.jp/press/2007/04/20070409_daichi_e.html
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Jacques :-)

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