Author Topic: Opportunity rover updates and discussion  (Read 48209 times)

Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #180 on: 11/03/2018 12:56 PM »
What does TDN stand for?

Offline DaveS

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Re: Opportunity rover updates and discussion
« Reply #181 on: 11/03/2018 01:30 PM »
False dawn, or any hope?

https://twitter.com/agc_uranus/status/1058711492261019648
False lock. Not Opportunity. The MER signal will initially be carrier only with a really low signal strength. Also, that data rate looks way too high to be from a MER UHF LGA. Only the directional HGA would transmit at those rates and that requires the rover to know where Earth is which it doesn't and won't do until the MER Ops team has had a chance to properly recover from all the various faults (low-power, clock and uplink lock).

Based on comparisons, I'd say that's from MRO, also assigned to DSS-36 and is currently downlinking data with similar signal characteristics.
« Last Edit: 11/03/2018 01:31 PM by DaveS »
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Offline hopalong

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Re: Opportunity rover updates and discussion
« Reply #182 on: 11/03/2018 01:39 PM »
What does TDN stand for?

Tear Down Network - I think

 The process of disconnecting the link at the end of the session.

Offline Nomadd

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Re: Opportunity rover updates and discussion
« Reply #183 on: 11/03/2018 01:45 PM »

Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #184 on: 11/04/2018 02:52 PM »
Another possibly false detection:

https://twitter.com/dsn_status/status/1059089205022916613

I've learned to understand the false detection. The signal appears to be too strong.

Offline Nomadd

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Re: Opportunity rover updates and discussion
« Reply #185 on: 11/04/2018 03:36 PM »
 Not sure if I'd call -151dbm too strong.
« Last Edit: 11/04/2018 04:58 PM by Nomadd »

Offline DaveS

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Re: Opportunity rover updates and discussion
« Reply #186 on: 11/05/2018 04:52 PM »
"For Sardines, space is no problem!"
-1996 Astronaut class slogan

"We're rolling in the wrong direction but for the right reasons"
-USA engineer about the rollback of Discovery prior to the STS-114 Return To Flight mission

Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #187 on: 11/14/2018 05:49 PM »
Currently performing Sweep and Beep on DSN Now:

https://eyes.nasa.gov/dsn/dsn.html

It's good to remind you that it's mid-November. We're right when the wind season is about to start and presumably clean the solar panels.

Meanwhile the dust storm is completely over. Tau is now 0.8 (source: https://mars.nasa.gov/mer/mission/status.html ). It's good to remind that according to some older status updates (https://spacenews.com/nasa-to-soon-start-45-day-campaign-to-revive-the-opportunity-mars-rover/), some engineers thought that the strongest chance for Oppy to phone home was when tau reached about 0.7, so we're around that point.

Fingers crossed!
« Last Edit: 11/14/2018 05:50 PM by Svetoslav »

Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #188 on: 11/14/2018 06:04 PM »
From DSN Now bot:

https://twitter.com/dsn_status/status/1062782929322102785

Again, we ought to be careful with these carrier locks and it would be wise to ignore them for now. Almost certainly false positive. The signal coming from Oppy will be too weak, and only  the team can inform us whether Oppy has woken up.

Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #189 on: 11/15/2018 06:11 PM »
DSN antennas transmitting again to Oppy:

https://eyes.nasa.gov/dsn/dsn.html

Offline ChrisGebhardt

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Re: Opportunity rover updates and discussion
« Reply #190 on: 11/15/2018 08:18 PM »
On the DNS right now....

Hoping this is real.

Offline Eosterwine

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Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #192 on: 11/15/2018 08:51 PM »
I pray it's so, but I don't have high hopes about this specific detection. Posting a screenshot from DSN Bot : it appears to be another false detection, now thanks to MAVEN. But I'll be very, VERY glad if I'm wrong!
« Last Edit: 11/15/2018 08:54 PM by Svetoslav »

Offline Eosterwine

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Re: Opportunity rover updates and discussion
« Reply #193 on: 11/15/2018 08:53 PM »
Damn, thought this was really it.  All other false alarms have been carrier only signals - this is the first time ive seen it say DATA.

Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #194 on: 11/15/2018 08:55 PM »
Damn, thought this was really it.  All other false alarms have been carrier only signals - this is the first time ive seen it say DATA.

Oh, I have seen it saying "data" a couple of other times. All false alarms.

Offline Eosterwine

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Re: Opportunity rover updates and discussion
« Reply #195 on: 11/15/2018 08:58 PM »
Can you link to any on the DSN Live twitter feed?  Ive searched before and only seen false carrier signals since June.

Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #196 on: 11/15/2018 09:03 PM »
Yes, this is the link: https://twitter.com/dsn_status

It has been said frequently that the signal will be very weak, as Oppy will be communicating only through the low-gain antenna. So weak that the DSN bot won't be able to detect it at all. Meanwhile, the bot gets confused because Mars is very noisy - with spacecraft transmitting all the time. So occasionally we see carrier lock AND data (I've seen this, too). But it's always another spacecraft - MRO or MAVEN.
« Last Edit: 11/15/2018 09:03 PM by Svetoslav »

Offline Svetoslav

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Re: Opportunity rover updates and discussion
« Reply #197 on: 11/15/2018 09:09 PM »
And here's the tweet from Michael Staab, member of the team:

https://twitter.com/AstroStaab/status/1063191729115824129

"When the team has something concrete, we will absolutely share it through an official press release.  Everything else is speculation until then".

Then we wait. Don't get your hopes up just yet. When the team is ready to announce something significant, they will do it.

Offline Eosterwine

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Re: Opportunity rover updates and discussion
« Reply #198 on: 11/15/2018 09:16 PM »
Maybe she should be excited that there are still people out there just as interested in this rover as the day it touched down.

Offline joseph.a.navin

Re: Opportunity rover updates and discussion
« Reply #199 on: 11/15/2018 09:25 PM »
I am new to this however, I have seen a few false lock-ons. However, I found it odd that the DSN locked on once and then another time. Is that usual? I know its a 50% chance but I guess we just have to hope. I also am aware that the DSN is not the most reliable, but this "lock-on" got more hype than others.

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