1998年的4月底,SOHO探测器已经完成了预定的任务。6月底,这个SOHO出事儿了。这个SOHO探测器既然要拍照片,自然需要3轴稳定。而且对3轴稳定的要求还很高。这个探测器是第一个使用陀螺仪来调整自身指向的探测器。15分钟内,指向太阳的角度不能偏离超过±10角秒。这是啥概念?转一圈是360度,1度分60份叫1角分,1角分再分60份叫1角秒。你说这个角度有多小吧。SOHO探测器使用了3个飞轮来控制自身指向角度。随着机器设备的工作运转,时间长了误差总是会慢慢积累。误差积累大了,靠飞轮来调整就不够用了,必须开发动机调整一下。每次开发动机调整,需要花费48小时的时间,可是科学家们实在是不舍得48个小时不能观测。所以,SOHO的工程师们就重新编写了一个代码,可以把时间压缩到24小时。倒霉就倒在这上边,这段代码是有BUG的。没有经过完整测试,就这么上传到了探测器上……
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