I'm not stupid. Maybe I could have worded it better, but you missed my point. I wasn't talking about a box primarily for radiaton shielding. My point was that a little more RAM or a little more flash -- even radiation-hardened -- would take only a very tiny bit of additional room inside the box, and weigh hardly anything.
That's true for everything. Add an instrument, it's only 5% of the weight of the others instruments together, or add some fancy stuff, you will be able to do [something cool] and it takes only a few space more,...
At some point, you have to stop. Yes, RAM don't take a lot of place or weight, but it takes some. 256 MB of DRAM is a relatively good amount of RAM for a space robot. (if it's use only for the on board computer, not for payload related stuff).
By comparaison, the "new" PF (it's based on evolution of previous design, but also supposed to be used for the future...) at Thales Alenia Space for LEO/MEO constellation (Globalstar second generation, and the upcoming O3b) has 4 MB of RAM for one CPU. Ok, it does a lot less than what you expect from a Mars Rover. (it's a small and cheap platform). I don't have the numbers, but I think that the Astrium/TAS new GEO alphabus is closer of 4 than of 256 (even in log2) Ok, these are all examples of commercial and mostly french spacecraft, but still.
NASA software engineer are lucky, at least they use in the real world the upload procedure. When I was at TAS I spend a few weeks to validate the "in orbit, complete flight software uploading procedure", knowing that it will probably be never used...
You will probably need to add a thermal regulation system on the board
Memory (and OS) is on a mobile SD card. Lauch may be a problem
A lot of other stuff on this board could have troubles during launch (connectors like usb, ethernet, and power plug, audio, hdmi, RCA) You don't really want a connector orbiting alone in your box
there is not a lot of mounting points
Of course you could buy the card, remove some connectors, drill holes yourself, sold the SD card, add some thermal conductor but is it still the "Raspberry Pi" ?
I really think that we could use COTS electronics in space (procs, soc,...), but not all cots electronics. A design close to this board could be used, with almost the same components, but I really think the board itself has to be adapted. List all unneeded stuff (network, audio, video, rca), keep other stuffs (usb, if you want tu plug something using usb), and design your pcb, based on the original design.
Get everything sold by the pcb manufacturer or an assembler. Of course this makes the board 10-20 times the price of the original (if you include some test boards). When you get a good project, contact Raspberry Pi Fundation and says Hey we have a good marketing for you, are you interested in this ? Could you sponsor us ? and get some money to compensate for the difference. Put a powered by Raspberry Pi on the launcher. (ok as a additional payload you probably don't have access to the fun advertisement on the launcher)
The "raw" Raspberry Pi board could be ok. But I think it worth the cost to made this changes.
Do you have result of tests or calculations somewhere ? I'm interrested in such stuff even if it's not close to my job anymore. I've seen a lot of stuff about space designed components but no test or calculations "regular" COTS. (just for reference, for spacecraft on a ~50 inclined orbit arround 1000km altitude, we got (in prediction and in real life) around 70 EDAC a day (with maybe 90% in the SAA, I may be able to find a plot of this) in a 4Mo memory. (the calculated double error rate, taking in account that we were scrubbing the full RAM in less than 10 seconds was negligeable) I don't remember of the expected error rate on the proc (erc32) but it was negligible too.
You probably can't use directly a Raspberry-Pi board in space application (radiation is not the only problem, you also have thermal issues,...), but using not specificaly space-hardened processors could be possible in a majority/median voter system. But you need to remplace one space hardened processor with a bunch of normal processors, and have a specific electronic for the voter system. And put a shield to lower the radiations.
Where do we stop ? Intel (or an other microprocessor designer) facilitated Kim Dotcom activity, which facilitated criminal activity. Do we takes also everything from Intel ?
From what I remember from university and if I compare to my current job, I have the same amount of free time. I used to go to the university campus and sit with friends, passing my time playing card or randomly browsing the Internet for 30-40 per hours at University (and sometime following class, says 10hours per week, the rest was not really needed), and now it's the same, except for the card plays (I have to work a few hours every weeks, and to be at work but on internet for some additional hours). And outside of work I don't have anything to do for work, which was not the case during my studies (hum, in fact, I never worked a lot, but some peoples did)
So in conclusion I think I had relatively the same amount of free time during the ai-class last year and during my studies a few years ago (start of the third millenium after the cannibal god zombie)
But the format of the exams/homework (lots of small multiple choice answer + some problems with numerical answers), combined with the fact that one (or two) questions had some ambiguities, is in favour of the massive number of online students (thats 410 students over tens of thousand if I remember correctly versus no students over a few hundreds)
I think you are wrong. Basically, your proposal is to introduce a bug in ntp (the aim of NTP is to keep the computer date synchronised with UTC, and UTC introduce leap second with an additional 23:59:60 second not by streching the time during one or more hours).
And you want to introduce a bug in a software to fix bugs in several other software. Yeah, great idea, but how many bug in other software which relies on a good system time will this cheat introduce ?
We should not workarround bugs by introducing other bugs, especialy in software widely distributed. Maybe it could be added as an option, with precise documentation, but not as a default behaviour.
One of them is the leader of a country which as one of the most powerfull Army on earth, the other one is just candidate to an election.
Of course the former is better suited to handle an alien invasion.
From my science courses, I know that God put the dinosaurs fossils in the ground, and that evolution don't exists. We always have the same species/subspecies/... form the beginning of the world (arround 6000 years ago.) So how does that fits in the model ?
- Georges never exists, God just gives us a dead body and implant some fake memories in our brain ?
- Georges will reborn (and he is in fact the son of God) ?
- Some other explanation ?
Okay. I officially inform Apple that I will buy a second hand iPad that Apple will sell to the "first hand user" in the next 6 month and export it to Iran. Know they are legally obliged to stop selling all iPads for the next six months ?
Do you really think that a organisation based in a country using imperial system and middle endian date format could put the naming in the right order ? You should thank them to not have used something like subdomains.tld.domain
Ok, I do the failings of any system with discrimination on citizenship.
Why should anybody have an advantage or a disadvantage just because he was born at the right place, or because he had the good combination of parents, or a combination of this two criteria (depending of the countries we are talking about) ? I don't understand that.
If you were born less than 13000 km from my birth place (in ECEF frame) and if you speaks flemish (just kidding, I'm from the other side of the language border), in my opinion you should be allowed to come to my country for any period of time and for any occupation, do whatever you want to do. If you are coming from further (or if the concept of birth don't applies to you) I have only one condition: just explain to everybody how to suppress the concept of "work".
Like other says, I just take an empty bottle.
But I have an other idea, untested yet. Just past the security with frozen water (aka ice). Froze a bootle for 24h, go to the airport, only the liquid are forbidden, so just drink the melted water just before the security. I'm waiting the good day to test it (if I can miss a flight with no consequence one day, I could try it. But I must also consider the fact tat I could be keept by airport security for a few hours, or worse)
I think it's a bad idea to have only one source of education for everyone. Of course, if you have a lot of different sources, some people will have better classes than other.
But the progress in science/technology/whatever are made when people discuss together and when each has its own point of view. I think that if everyone gets the same classes, it will slow down innovations, because these people will think "in the same way".
Slashdot Mirror
I'm not stupid. Maybe I could have worded it better, but you missed my point. I wasn't talking about a box primarily for radiaton shielding. My point was that a little more RAM or a little more flash -- even radiation-hardened -- would take only a very tiny bit of additional room inside the box, and weigh hardly anything.
That's true for everything. Add an instrument, it's only 5% of the weight of the others instruments together, or add some fancy stuff, you will be able to do [something cool] and it takes only a few space more, ...
At some point, you have to stop. Yes, RAM don't take a lot of place or weight, but it takes some. 256 MB of DRAM is a relatively good amount of RAM for a space robot. (if it's use only for the on board computer, not for payload related stuff).
By comparaison, the "new" PF (it's based on evolution of previous design, but also supposed to be used for the future...) at Thales Alenia Space for LEO/MEO constellation (Globalstar second generation, and the upcoming O3b) has 4 MB of RAM for one CPU. Ok, it does a lot less than what you expect from a Mars Rover. (it's a small and cheap platform). I don't have the numbers, but I think that the Astrium/TAS new GEO alphabus is closer of 4 than of 256 (even in log2) Ok, these are all examples of commercial and mostly french spacecraft, but still.
NASA software engineer are lucky, at least they use in the real world the upload procedure. When I was at TAS I spend a few weeks to validate the "in orbit, complete flight software uploading procedure", knowing that it will probably be never used...
Less doping or worse enforcing policy ?
Of course you could buy the card, remove some connectors, drill holes yourself, sold the SD card, add some thermal conductor but is it still the "Raspberry Pi" ?
I really think that we could use COTS electronics in space (procs, soc, ...), but not all cots electronics. A design close to this board could be used, with almost the same components, but I really think the board itself has to be adapted. List all unneeded stuff (network, audio, video, rca), keep other stuffs (usb, if you want tu plug something using usb), and design your pcb, based on the original design.
Get everything sold by the pcb manufacturer or an assembler. Of course this makes the board 10-20 times the price of the original (if you include some test boards). When you get a good project, contact Raspberry Pi Fundation and says Hey we have a good marketing for you, are you interested in this ? Could you sponsor us ? and get some money to compensate for the difference. Put a powered by Raspberry Pi on the launcher. (ok as a additional payload you probably don't have access to the fun advertisement on the launcher)
The "raw" Raspberry Pi board could be ok. But I think it worth the cost to made this changes.
iStuff dock are not cool enough ?
Do you have result of tests or calculations somewhere ? I'm interrested in such stuff even if it's not close to my job anymore. I've seen a lot of stuff about space designed components but no test or calculations "regular" COTS. (just for reference, for spacecraft on a ~50 inclined orbit arround 1000km altitude, we got (in prediction and in real life) around 70 EDAC a day (with maybe 90% in the SAA, I may be able to find a plot of this) in a 4Mo memory. (the calculated double error rate, taking in account that we were scrubbing the full RAM in less than 10 seconds was negligeable) I don't remember of the expected error rate on the proc (erc32) but it was negligible too.
You probably can't use directly a Raspberry-Pi board in space application (radiation is not the only problem, you also have thermal issues, ...), but using not specificaly space-hardened processors could be possible in a majority/median voter system. But you need to remplace one space hardened processor with a bunch of normal processors, and have a specific electronic for the voter system. And put a shield to lower the radiations.
Where do we stop ? Intel (or an other microprocessor designer) facilitated Kim Dotcom activity, which facilitated criminal activity. Do we takes also everything from Intel ?
From what I remember from university and if I compare to my current job, I have the same amount of free time. I used to go to the university campus and sit with friends, passing my time playing card or randomly browsing the Internet for 30-40 per hours at University (and sometime following class, says 10hours per week, the rest was not really needed), and now it's the same, except for the card plays (I have to work a few hours every weeks, and to be at work but on internet for some additional hours). And outside of work I don't have anything to do for work, which was not the case during my studies (hum, in fact, I never worked a lot, but some peoples did) So in conclusion I think I had relatively the same amount of free time during the ai-class last year and during my studies a few years ago (start of the third millenium after the cannibal god zombie) But the format of the exams/homework (lots of small multiple choice answer + some problems with numerical answers), combined with the fact that one (or two) questions had some ambiguities, is in favour of the massive number of online students (thats 410 students over tens of thousand if I remember correctly versus no students over a few hundreds)
I put everything on megaupload
Like a sextant, some ephemeris, a good clock, a map, and a compas ? This exists since a few centuries.
And you want to introduce a bug in a software to fix bugs in several other software. Yeah, great idea, but how many bug in other software which relies on a good system time will this cheat introduce ?
We should not workarround bugs by introducing other bugs, especialy in software widely distributed. Maybe it could be added as an option, with precise documentation, but not as a default behaviour.
One of them is the leader of a country which as one of the most powerfull Army on earth, the other one is just candidate to an election. Of course the former is better suited to handle an alien invasion.
From my science courses, I know that God put the dinosaurs fossils in the ground, and that evolution don't exists. We always have the same species/subspecies/... form the beginning of the world (arround 6000 years ago.) So how does that fits in the model ? - Georges never exists, God just gives us a dead body and implant some fake memories in our brain ? - Georges will reborn (and he is in fact the son of God) ? - Some other explanation ?
Okay. I officially inform Apple that I will buy a second hand iPad that Apple will sell to the "first hand user" in the next 6 month and export it to Iran. Know they are legally obliged to stop selling all iPads for the next six months ?
Do you really think that a organisation based in a country using imperial system and middle endian date format could put the naming in the right order ? You should thank them to not have used something like subdomains.tld.domain
My chemistry teacher blew stuff up too. His hand, among other things. (Un?)fortunately it was not in front of my class.
Ok, I do the failings of any system with discrimination on citizenship. Why should anybody have an advantage or a disadvantage just because he was born at the right place, or because he had the good combination of parents, or a combination of this two criteria (depending of the countries we are talking about) ? I don't understand that.
If you were born less than 13000 km from my birth place (in ECEF frame) and if you speaks flemish (just kidding, I'm from the other side of the language border), in my opinion you should be allowed to come to my country for any period of time and for any occupation, do whatever you want to do. If you are coming from further (or if the concept of birth don't applies to you) I have only one condition: just explain to everybody how to suppress the concept of "work".
Space Dustman
Like other says, I just take an empty bottle. But I have an other idea, untested yet. Just past the security with frozen water (aka ice). Froze a bootle for 24h, go to the airport, only the liquid are forbidden, so just drink the melted water just before the security. I'm waiting the good day to test it (if I can miss a flight with no consequence one day, I could try it. But I must also consider the fact tat I could be keept by airport security for a few hours, or worse)
I think it's a bad idea to have only one source of education for everyone. Of course, if you have a lot of different sources, some people will have better classes than other. But the progress in science/technology/whatever are made when people discuss together and when each has its own point of view. I think that if everyone gets the same classes, it will slow down innovations, because these people will think "in the same way".
I'm sorry but who's this Alan Parsons ? Never heard about.
You just need to add subtitle.
I don't have the statistics but I think that most do it only once. (GEO and MEO stay usually on graveyard orbit)