[opendtv] "Live" DTV from Mars now possible !
- From: Olivier HOUOT <olho_avatar_i@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 10 Aug 2004 22:26:05 +0200
I just happened to stumble on the telecom specs of the future NASA mars
reconnaissance orbiter:
http://mars.jpl.nasa.gov/mro/mission/sc_telecomm.html
It is scheduled for launch in less than a year, and allows for 6 Mbps
over a distance of 100 million kilometers.
Now with good quality SDTV feeds ranging from 4 to 6 Mbps, and possibly
less with state of the art MPEG2 encoders, this would indeed make real
time video transmission possible from the red planet, with a
transmission delay that would be as small as 5 mn with the said distance
(true, those would be the most favourable conditions, when Mars and
Earth are practically face-to-face, worst case would be three times that
amount, probably with a much lower bitrate).
Of course, there is not much action in orbit, but it could be used to
relay transmissions from rovers or an exploration plane (another of
NASA's projects) and, of course , the first steps of man on Mars.
That may be a little tight for HDTV, though, unless 720P artfully
compressed using H.264 ...?
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