2009 Or 2011 ?, 1 or 2 ? |
2009 Or 2011 ?, 1 or 2 ? |
May 3 2005, 11:11 AM
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#1
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Member Group: Members Posts: 290 Joined: 26-March 04 From: Edam, The Netherlands Member No.: 65 |
Does anybody know when and how many MSL will go, or when the decision on this will be made ?
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Nov 29 2005, 08:13 AM
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#2
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
The dual frequency occultation experiment actually turned out to be somewhat "underwhelming". It used longer frequencies than the S-band link to Earth, and because of data recording limitations, only measured the amplitude of the signal and the frequency of the strongest signal being frequency-tracked by the receiver. At the longer frequencies, ionosphere refraction was greater, and one or both channels were refracted enough to cause the radio-occultation equivalent of "mirages": ray-paths got crossed, rendering quantitative analysis of lower altitude data invalid. If they'd been able to record the full signal spectrum, the problem would have been less or maybe quantitatively interpretible.
Radio occultation with receiver on the spacecraft continues to be proposed, as putting a hundred kilowatt continuous wave transmitter on Earth gives a far stronger signal at the spacecraft and higher signal-to-noise than the usual spacecraft-to-Earth link, but since regular radio occultation's nearly free, other than the need for an ultrastable oscillator, it's never made the payload selection. |
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Guest_exobioquest_* |
Nov 29 2005, 06:54 PM
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#3
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Guests |
You people get easily distracted don't you?
What are the possible scenarios? 1. Launch 1 MSL in 2009: If all goes as planned so far. 2. Launch 1 MSL in 2011: If it gets bumped up. 3. Launch 2 MSLs in 2011: Why? 4. Launch 1 MSL in 2009, another in 2011 or later: Why not? |
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