Re: One of Largest Telescopic Lenses Ever Heads to Mars

Sam Wormley wrote:

> Eric wrote:
>
>>
>> Just curious, what is the data rate they can transmit back to Earth from
>> Mars? 300 baud? better? worse? What about from way out by Saturn?
>> Thanks
>> Eric
>>
>
> Ref: http://marsprogram.jpl.nasa.gov/mro/mission/sc_instru_kaband.html
>
> Telecommunications Experiment Package
>
> Mars Reconnaissance Orbiter will test the use of a radio frequency
> called Ka-band to demonstrate the potential for greater performance
> in communications using significantly less power.
>
> While the standard in deep-space communication is currently a radio
> wave known as X-band, future spacecraft will incorporate radio systems
> utilizing the Ka-band of the radio spectrum instead. The Ka-band
> frequency is four times higher than X-band (32 Gigahertz compared to
> 8 Gigahertz), which allows much higher data rates to be transmitted.
> Mars Reconnaissance Orbiter carries a separate Ka-band radio in order
> to demonstrate this new capability for future missions.
>
> Ref: http://marsprogram.jpl.nasa.gov/mro/mission/comm.html
>
> So, out of 16 hours of daily Deep Space Network tracking, Mars
> Reconnaissance Orbiter will send data to Earth for 10 to 11 hours for
> about 700 days. The data rate will be about 0.5 to 4 megabits per
> second. With these figures in mind, the estimated volume of data
> returned by Mars Reconnaissance Orbit will be about 34 terrabits.
> That's equivalent to 4 terrabytes of data--about as much as can be
> stored on 6,500 compact disks. It's also 10 to 20 times more data than
> previous Mars missions and more data than all previous planetary
> missions combined.
>
> Four (4) megabits per second is what I get at home from my broadband
> internet provider.

So essentially the current data rates are about the same as a 56k modem.
Actually, thats not bad at all, if this new system proves out it will be
much faster.
Eric


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