死因来了...软件工程师要GG了吗?
Computing glitch may have doomed Mars lander
系统错误可能毁了火星登陆器
Preliminary analysis suggests that the lander began the manoeuvre flawlessly,
braking against the planet’s atmosphere and deploying its parachute. But at
4 minutes and 41 seconds into an almost 6-minute fall, something went wrong.
The lander’s heat shield and parachute ejected ahead of time, says Vago.
Then thrusters, designed to decelerate the craft for 30 seconds until it was
metres off the ground, engaged for only around 3 seconds before they were
commanded to switch off, because the lander's computer thought it was on the
ground.
初步分析显示登陆器一开始完美作动，也张开降落伞气动煞车。
但是4分41秒后出错了，进入6分钟的自由落体。
隔热罩跟降落伞被过早抛弃。
而原本应该燃烧30秒的逆向喷射只作用了3秒就被关闭
因为登陆器认为她已经着陆了。
The lander even switched on its suite of instruments, ready to record Mars’s
weather and electrical field, although they did not collect data. “My guess
is that at that point we were still too high. And the most likely scenario is
that, from then, we just dropped to the surface,” says Vago.
登陆器甚至开启了上面的仪器准备纪录火星的气象跟电场，虽然没搜集到任何资讯。
没收集到的原因可能是高度过高，之后就摔到地上了。
The craft probably fell from a height of between 2 and 4 kilometres before
slamming into the ground at more than 300 kilometres per hour, according to
estimates based on images of the probe’s likely crash site, taken by NASA’s
Mars Reconnaissance Orbiter on 20 October.
从NASA 10月20号拍摄的撞击坑影像来判断
登陆器可能从高度2~4公里掉落并以超过时速300公里速度撞击火星地表。
The most likely culprit is a flaw in the craft’s software or a problem in
merging the data coming from different sensors, which may have led the craft
to believe it was lower in altitude than it really was, says Andrea Accomazzo
最有可能的原因是登陆器自身软件瑕疵或各侦测器资讯整合出错
造成登陆器认为自身高度比实际高度还低。
上次日本JAXA的瞳也是软件(定位程式)有瑕疵，最后疯狂旋转到解体。
JAXA的94亿台币跟NASA的22.7亿台币都变成地球轨道上的太空垃圾