Machine elder brother plans to take the advantage of small on April 6 long holiday originally, go abroad by air with 8 younger brother of billow.
Cannot think of, today one big early by 8 younger brother suddenly shake up, he says that he cannot be in that day by airplane.
Machine elder brother one face is muddled force, gave what major issue?
8 younger brother speak plausibly and at length the ground says: System of location of GPS whole world, new cycle will be greeted on April 6. And old GPS system, may appear the mistake of similar computer Y2k... be in so that day by air, it is exceeding insecure.
Machine elder brother sees small gain, discovery is 8 younger brother not merely a person so say, many netizens are right was anxious very much that day.
After all GPS is being used besides aviation industry, other industry also cannot leave it.
Emmm, this thing is troubled by be troubled by, still be troubled by went up to heat up search.
So machine elder brother is necessary today popular science, its cause and effect.
Above all we must be made clear, "GPS system clears " this thing is true.
And go up in American Www.gps.gov, announcement went out at the beginning of this month, say GPS will greet Zhou Shu to retroflexion.
Affirmative meeting has young associate to raise question, of when everything is all right, the GPS that everyday 4 billion person is used, how to come suddenly does the system clear?
Fasten urgent, listen to machine elder brother to say slowly.
GPS itself has his time system. And in last centuries, scientist to lower fault rate, used to it more be able to bear or endure drill 10bit tally.
Want to ask machine elder brother 10bit is what concept?
See your cloud first dish in, little a hundreds of GB, the resources of many a few TB says again. (otherwise, borrow a conversation? )
Bit (bit) this unit, be information most subsection, only 0 change with two kinds 1. Since 1bit has 2 kinds of change, how many kinds of change does that 10bit have?
Here, machine elder brother emphasizes, must not think 10 2 add up came to an end, it is not common addition, need to use power however.
10 when change twice square, that is 1024 kinds of change.
So, GPS fastens statistic to calculate Zhou Shu, can arrive from 0 computation only 1023, can come again from the beginning again next.
A year 52 weeks, 1024 weeks of conversion come over, it is 19.7 years probably. Machine elder brother in other words, every other 19.7 years, GPS system can clear.
And the time of GPS, it is the 00:0 from January 6, 19800 begin. So...
alleged: Do not importune not knowable, should from foregone push sealed.
First time occurrence GPS clears, on August 21, 1999.
The 2nd, also be this year this, on April 6, 2019.
Clever machine friend has been rolled out, appear the next time again, will be on November 20, 2038.
Breathe out... feeling of machine elder brother, went up to everybody an advanced maths.
But, be in aside 8 younger brother, said sentence but.
What 8 younger brother care more is, on April 6 that day, still can does by airplane go travelling?
We must be made clear, GPS clears attribute normal phenomenon, after all the family is such designs.
Not only GPS, the north that links our nation research and development fights navigation system, also put in this kind of phenomenon.
Do not pass, be being fought because of north is to use 13bit to calculate Zhou Shu, so every other 157.5 years, ability can appear to clear.
This, our north fights a system or have vision very much, machine elder brother should be blown explode!
More what is more,the rather that, last time GPS clears, did not appear particularly serious problem, and airline has last answer experience, also won't become what big question this.
Today, he Zhi force also says engineer of academy of news of empty day of Chinese Academy of Sciences, if be put in hidden trouble, need to ask GPS receiver supplies square newer firmware only, and had been done beforehand case and emulation test, can eliminate.
Respecting this, if had not given up apprehension, machine elder brother sees however, how did land publish a document entirely, the solution of this second incident was mentioned inside.
Cardinal principle of machine elder brother looked, what with He Gong Cheng division states is about the same, it is the firmware that the proposal maintains newest.
But, machine brother should say but.
This GPS clears, let machine elder brother remember, the IPhone of dynamic changed 2016 bricky incident.
At that time, what want machine elder brother to use only is the system of IOS 8 above, and be the IPhone of 64 processor, if hand of machine elder brother is owed, move systematic time to January 1, 1970, next...
Do not have next next, had changed because of the IPhone of machine elder brother brick, cannot leave machine.
As to the reason, clear with today's GPS very picture.
What IOS interior uses is Unix time, its to time axis, start was on January 1, 1970 00:00:00, add slowly with the binary system next.
But, cannot a bit oversight is very important: What machine elder brother uses usually is Beijing time, it is so called east 8 time zone (UTC/GMT+08:00) .
Move IPhone to Beijing time when machine elder brother the 00:0 January 1, 19700, the time axis with actually internal system, had gone back the 16:0 December 31, 19690.
The problem goes here, this time to IOS, it is a negative! ! Can spark next Bug. IPhone darling is very helpless also: Who am I? From where do I come? Where should go? Finally, can with dead offer an apology, change next brick...
Do not pass, malic engineer also is not abstain from eating meal, after this Bug is exploded to go out, pushed firmware of an IOS 9.2.1 to be solved newlier rapidly.
Additional, actual measurement of machine elder brother, the IOS 12.1.4 system on the hand, had moved do not go back 1970, the likelihood prevents a hand to owe namely.
This story also tells us, do not look for trouble to won't die.
?
Good, the story of GPS and IOS tells here today, machine elder brother sets his mind at to go billow!
