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Unmanned Spaceflight.com > Mars & Missions > Perseverance- Mars 2020 Rover
Stratespace
I am so enthusiastic about the (proposed) Mars2020 camera suite during EDL, as presented today at IPPW:
- 3 PointGrey Chameleon 3 that will be on the skycrane and look up, to monitor parachute deployment at 150 fps.
- 1 GoPro Hero 4 on the skycrane, looking down to monitor the rover descent and landing
- 1 GoPro Hero 4 on the rover, looking up to monitor the skycrane and fly-away
- 1 GoPro Hero 4 on the rover, looking down like MARDI did on Curiosity
- MARDI, of course.

All GoPro have microphone that will be activated, and have been tested successfully in the proper thermal and radiative environment. We should have some awsome footage if it actually flies.
James Sorenson
I have three Point Grey Chameleon3 cameras myself for my personal rover. Wonderful cameras...but you can't be serious for...2020? I doubt these are even space qualified or even hold up to the temperature extremes. Unless they will be in custom cases that are heated.


Edit: Oh and by the way, the cameras themselves I have found out put off alot of heat. smile.gif
nprev
Do you have a published, verified reference for this information, Stratespace? I too find it extremely difficult to believe that they plan to fly consumer-grade cameras on any Mars surface mission.

In fact, I find it impossible. I doubt very much that off-the-shelf GoPro hardware could be sterilized to meet PPPs, pass environmental qualification or meet reliability/mission assurance standards, and that's by no means a comprehensive list of requirements.
mcaplinger
QUOTE (nprev @ Jun 15 2016, 08:06 PM) *
Do you have a published, verified reference for this information, Stratespace?

http://ippw2016.jhuapl.edu/docs/abstracts/...rumentation.pdf page 18 has the system description but not the specific details.

I wasn't at this conference but it seems unlikely that someone would just make this stuff up.
nprev
Mike, if you think it's credible then I'm 90% sold. Still, it seems like a very startling design choice with a large number of attendant risks, esp. for a Flagship-class mission like Mars 2020. Really want to verify this claim.
James Sorenson
Commercial hardware has been slowly making its way to Mars. The Chemcam LIBS UV-VIS-NIR optical spectrometers are commercial spectrometers from Ocean Optics but were modified for the space enviornment and survival on Mars. So if the information Stratespace presented is true, and they do plan on using Chameleons and Gopros, I'd expect them to be modified as well to withstand the conditions, and during that process, extensively cleaned to satisfy PP protocols.
mcaplinger
QUOTE (nprev @ Jun 15 2016, 08:23 PM) *
...if you think it's credible then I'm 90% sold.

I think it's believable that they said they would use this hardware. Since I design and build space cameras for a living, you can likely predict how I feel about using a $300 commercial camera in such a context.
Stratespace
QUOTE (nprev @ Jun 16 2016, 06:06 AM) *
Do you have a published, verified reference for this information, Stratespace?
Well, the slides were just presented by JPL minutes earlier at IPPW, I did not expect to be not believed. Sooner or later, the slides will be available...

edit: phiew, someone saved me by taking a picture of one of the slides: https://twitter.com/IGerth/status/743103067655114752
For your information, PUC stands for "Parachute Up look Camera", DDC for "Descent Stage down look camera", RUC for "Rover Up look camera" and RDC for "Rover Down look camera".

climber
Hum. This will generate a lot of data. Even if low priority images, Will we have the chance to download everything?
Anyway, I wish we had one of these on Schiaparelli rolleyes.gif
Stratespace
Yep, this will generate at least ~1GB of data. Hard to transmit, but still feasible.
James Sorenson
QUOTE (Stratespace @ Jun 15 2016, 10:48 PM) *
I did not expect to be not believed.


I'm still in alittle dis-belief purely in a technical perspective of the choice to use these cameras. But it's exciting and interesting as well. Hope you can understand our reluctance at first to believe it. But that slide is the confirmation. Hopefully all the's camera's make it through all the testing and qualifications and make it onboard! Thank you for presenting the information here. smile.gif
mcaplinger
"Notional" means they haven't decided yet.
climber
So, I guess we can afford one camera labbeled UNMSF on Red Dragon in 2018 smile.gif
Well, I'm not sure how to "sell" this idea to you, Mike, but I'll be glad to get your feed-back on this. May be we can open a dedicated topic?
nprev
Stratespace, thank you very much, and I also apologize for my initial disbelief. Extraordinary claims and evidence, of course. wink.gif

Very interesting that this schema is being seriously considered, yes. Makes a bit more sense given that their prime function is restricted to the late EDL phase, so they're just for engineering data acquisition and 'Kodak moments'; if any or all of them don't work it wouldn't be a show-stopper.

That said, integration is always where the dragons may lurk in terms of mission risk, and at first glance this seems to have no shortage of unsettling possibilities. Should be a lot of fun to work through them all.
scalbers
Herobrine has already been on this wink.gif

http://www.unmannedspaceflight.com/index.p...st&p=230869
nprev
...clearly we gotta be more careful what we post in jest lest it be taken seriously... biggrin.gif

You just don't buy a couple of $300 cams at an electronics store & slap them on to a top-of-the-line interplanetary mission with planned significant longevity, obviously. I can see GoPro getting a contract to build custom cams to reduce mass & comply with both vehicle interface requirements & PPPs. No idea if that would be favorable in terms of cost and performance vs. building them in-house or procuring them from flight-proven vendors, but it really would have to be in order to offset the increased risk level.
Stratespace
One of the main issues is to decouple the GoPros from the spacecraft onboard software to avoid any pollution in case of firmware crash. The validation of GoPro's firmware is very far from those of space software. If the interface is still USB (not native at all in space hardware), one can imagine there will be a dedicated hardware to ensure the proper interface and soft safety. Not a small business.
nprev
No, not at all. I strongly suspect that this idea will be off the table in short order for those reasons alone.
Stratespace
Yes maybe. But it went through the clearance procedures in JPL up to a publication and presentation at a conference. Not a big deal, but... still an official publication toward the scientific/engineering community.
We may suspect those details have been discussed and considered not a show stopper so far. I cannot imagine JPL presenting fairytales in a project that will launch 4 years from now.
dvandorn
The cameras on the descent stage will obviously need to send and store their data real-time to the rover, obviously, for transmission back to Earth after landing.

Is there any advantage to making this a wireless connection, which can then also provide video from rover release to the end of the fly-away maneuver? That could provide an initial low-level flyover of a section of the local terrain where the rover won't likely be allowed to go (contamination issues), and give more data about the entire site. Sort of a first survey along the lines of the proposed hopper-copter's aerial surveys. This could even use the same radio data channel that will later be used to connect the rover to the hopper-copter.

I'm just trying to think of ways to get the maximum value out of these cameras. Besides the extreme cool factor, of course... biggrin.gif

-the other Doug

Explorer1
A microphone, at last! http://www.planetary.org/blogs/bruce-betts...es-on-mars.html
Mounted on the camera, for scientific purposes (to listen to the cracking noise from the laser), though I'm glad whatever the reason!
Gerald
I'd expect to hear some occasional cracking of rocks near sunrise and sunset when temperature is changing rapidly. But maybe InSight is better equipped for this purpose.
Another conceivable application could be a sonar. By measuring signal travel times after a ChemCam shot you could reconstruct some 3d information about the environment; this would of course work better with more than one microphone. But zapping several targets might work, too. And you could learn something about the sound damping properties of the ground, which is related to roughness and hardness.
Combine this acoustic surface property map with visual, and maybe with thermal maps, and you get an enriched basis to select targets of interest for contact science.
nprev
Gotta remember how exceedingly thin Mars' atmosphere is, though. I suspect that the only truly noisy part will be EDL, and even that's gonna sound pretty subdued compared to an equivalent event on Earth.

We'll probably hear sounds from the rover mechanisms via structural conduction, and perhaps there will be a windstorm or a direct hit by a dust devil that might produce a faint whistle or two, but short of that I suspect that Mars is very quiet indeed.
climber
Will be surprised if Mars will not surprise...
vjkane
QUOTE (dvandorn @ Jun 22 2016, 03:16 PM) *
The cameras on the descent stage will obviously need to send and store their data real-time to the rover, obviously, for transmission back to Earth after landing.

Maybe they will just store the data on the microSD card and download it at leisure via a usb cable.
scalbers
Would a LIDAR help with 3D mapping of the local terrain to help with stereo imaging and constructing 3D models?
mcaplinger
QUOTE (vjkane @ Jul 17 2016, 03:14 PM) *
Maybe they will just store the data on the microSD card and download it at leisure via a usb cable.

After the descent stage flies away? You'd need a rather long cable. wink.gif
TheAnt
QUOTE (vjkane @ Jul 18 2016, 01:14 AM) *
Maybe they will just store the data on the microSD card and download it at leisure via a usb cable.


From Earth to Mars? That would require a seriously long USB cable, not to mention the need to use serious bug and virus detection before any transfer can be allowed.
Another risk is that if we have such a direct connection to Mars, it would not take long before we get the first spams with messages like:
I am the widow of the former president of Cryse. Help me transfer my 3 billion from Hellas to Syrtis Major, please send 10^7 Maritan rollads to my account to faciliate the transfer. tongue.gif
vjkane
QUOTE (TheAnt @ Jul 19 2016, 08:23 AM) *
From Earth to Mars? That would require a seriously long USB cable, not to mention the need to use serious bug and virus detection before any transfer can be allowed.
Another risk is that if we have such a direct connection to Mars, it would not take long before we get the first spams with messages like:
I am the widow of the former president of Cryse. Help me transfer my 3 billion from Hellas to Syrtis Major, please send 10^7 Maritan rollads to my account to faciliate the transfer. tongue.gif

I had been thinking of just a few inches to a bus in the rover, but a cable stretching all the way back to Earth would eliminate the need for those expensive relay orbiters. laugh.gif
climber
There is the following information on AW&ST August 15-28 2016 issue regarding the microphone:
"SuperCam also will have a microphone, both to gather information about the targets being hit with the laser light and to collect more data on the Martian weather. Wind sounds will be correlated with wind-speed measurements collected by the rover's weather instruments, while the volume of sound generated by laser's "zap" is directly proportional to the hardness of the rocks". The quote is from Roger Wiens of Los Alamos, the PI of both ChemCam and SuperCam
This is much more than I was anticipating regarding sound conduction by Martian air. Must be very sensitive to collect such information. Most of us were thinking we'll listen only at rover's noises I'd said.
Gerald
I don't think, that sound attenuation poses any significant issue on Mars on the meter scale, especially when relative humidity is very low.
With this calclulator for atmospheric absorption, for sound of 1000 Hz, I get
0.014 dB / m for 103 kPa at 0C with 10% relative humidity, and
0.0255 dB / m for 0.6 kPa at -20C with 1% relative humidity.

Above 10 kHz, it may be going to become an issue on the meter scale.

The microphone membrane, however, might be required to deal with reduced sound intensity, since the low-pressure atmosphere transports less sound energy for the same amplitude.
rlorenz
QUOTE (Gerald @ Aug 28 2016, 07:34 AM) *
I don't think, that sound attenuation poses any significant issue on Mars on the meter scale,
The microphone membrane, however, might be required to deal with reduced
since the low-pressure atmosphere transports less sound energy for the same amplitude.


Yes, 6mb CO2 conveys sound quite happily over distances of a few meters. Here is some music played ('quite loud' in 1 bar air, but considerably
quieter here at 6mb simply because a loudspeaker diaphragm displacement at a given speed produces a lower sound pressure level simply because the
air density is lower, as you note). The sound is a bit distorted (ethereal, dare I say..?) because of reverberation/multipath between the parallel
metal walls of the chamber (these were tests I did a couple of weeks ago at the Mars Environment simulation chamber in Aarhus, Denmark).
There's also a lot of plant noise (electrical, rather than vibration/acoustic)

http://www.lpl.arizona.edu/~rlorenz/oxygene_on_Mars.mp3

More details to be presented at the Mars Atmosphere workshop in Granada in January

Ralph Lorenz
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