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原帖由 大饼 于 2010-7-28 23:36 发表 
用286来控制个航天马桶是可以的。现在不论飞机还是航天都不会用286来做实时控制的。
连神6上马桶都用了ARM7（好像有点overkill）
航天器上采用的内存和CPU, 都是特别强化过的，为了抵抗外层空间的电离辐射和高能粒子。以前记得在哪里一篇文章看到过，说是探测器还不是航天飞机上，用的就是类似于80386的处理器，但是，那一块小小的处理器板要几十万美金，就是因为是强化版。
现在手边能找到的就是这个了：
http://en.wikipedia.org/wiki/Radiation_hardening
另外，还有一篇以前看过的文章，将那些给shuttle写软件的人如何工作的，也推荐给有兴趣的人看看：
http://www.fastcompany.com/magazine/06/writestuff.html
They Write the Right Stuff
By: Charles FishmanDecember 31, 1996
As the 120-ton space shuttle sits surrounded by almost 4 million pounds of rocket fuel, exhaling noxious fumes, visibly impatient to defy gravity, its on-board computers take command.
The right stuff kicks in at T-minus 31 seconds.
As the 120-ton space shuttle sits surrounded by almost 4 million pounds of rocket fuel, exhaling noxious fumes, visibly impatient to defy gravity, its on-board computers take command. Four identical machines, running identical software, pull information from thousands of sensors, make hundreds of milli-second decisions, vote on every decision, check with each other 250 times a second. A fifth computer, with different software, stands by to take control should the other four malfunction.
At T-minus 6.6 seconds, if the pressures, pumps, and temperatures are nominal, the computers give the order to light the shuttle main engines -- each of the three engines firing off precisely 160 milliseconds apart, tons of super-cooled liquid fuel pouring into combustion chambers, the ship rocking on its launch pad, held to the ground only by bolts. As the main engines come to one million pounds of thrust, their exhausts tighten into blue diamonds of flame.
Then and only then at T-minus zero seconds, if the computers are satisfied that the engines are running true, they give the order to light the solid rocket boosters. In less than one second, they achieve 6.6 million pounds of thrust. And at that exact same moment, the computers give the order for the explosive bolts to blow, and 4.5 million pounds of spacecraft lifts majestically off its launch pad.
It's an awesome display of hardware prowess. But no human pushes a button to make it happen, no astronaut jockeys a joy stick to settle the shuttle into orbit.
The right stuff is the software. The software gives the orders to gimbal the main engines, executing the dramatic belly roll the shuttle does soon after it clears the tower. The software throttles the engines to make sure the craft doesn't accelerate too fast. It keeps track of where the shuttle is, orders the solid rocket boosters to fall away, makes minor course corrections, and after about 10 minutes, directs the shuttle into orbit more than 100 miles up. When the software is satisfied with the shuttle's position in space, it orders the main engines to shut down -- weightlessness begins and everything starts to float. |
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发表于 2010-7-28 23:31
