Why develop Beidou? 27 years ago, China was forced into panic

recent

After the southern floods and heavy rains, a sudden landslide collapsed 5 houses in Shimen County, Hunan Province. Fortunately, there were no casualties.
 

becausebefore landslideShimen County14household33peopleReceived earlyBeidou satellitewarning issuedEvacuate in time

all the timeWhen each Beidou satellite is launchedBesides looking up at the starsLament the magic of technologywe don't knowBeidou satellite’s impact on our daily livesIs thereHow important

1983Korean Air007flightAfter taking off from New YorkMysterious entry into Soviet airspaceThe night is darkThe Soviet Union many timesFire warning shotsThe civilian airliner did not notice

When about to leave Soviet airspaceshot down by missile

revealed via black box investigationdue to captainOperation errorNot performing standard flight modegeomagnetic navigationmalfunctionCausing the aircraft to deviate from its intended courseairlinerEntering airspace by mistake

two years laterexistGlobal GPS SeminarsuperiorThe United States made it clearforEnsure homeland securityRespond to emergenciesThe United States will, under special circumstancesThree things to do about GPS

a. Reduce the other party’s navigation accuracy

b. Change encoding at any time

c. Carry out regional management

In order not to be controlled by othersBu Qingjun found an academician of the Chinese Academy of SciencesChen FangyunDiscuss togethersatellite positioning plan

For US GPS rangingFour-star positioningIn order to save moneyDesigned by Chen FangyunTwo-star positioningFirst satisfy domestic navigation and positioning 

Satellite navigation is very complexLaunched around the Earth24satellitesformThree different orbital surfacesknitted into onenetworkPeople can see it at the same time anytime, anywherefour starsDevelopment of the American GPS systemIt is based on this principle

China Gangreform and opening upNational power is limitedSatellite positioning plans have to be postponed 

until1993China GalaxyCarrying goods such as stationery, small hardware, mechanical parts and dyesDeparting from Tianjin PortPlanned to ship to the Middle East

The GPS signal in the sea area where the Galaxy is located is turned offThe ship was forced to drift in the Indian Ocean33sky

at the beginningThe project team is not in one room20Working in a square meter roomNo satellite in handJust from the other two satellite programsFree up two spare satellitesAn exclusive function was also designed for Beidou——short message

1995Project stuck infirst hurdleUnable to solve the problem of "fast tracking" of satellite signals

When everyone is at a lossWang Feixue、Yong ShaoweiandEurosteelThree of them have not yet graduated with Ph.D.20young mantook out a set"Fully Digital" Solution three peoplein less than one10square meters of laboratoryhold4Ten thousand yuan of fundingSurrounded by a relatively advanced computertime consuming3YearTesting got the first batch"Quickly catch sperm and follow" data 

2000Beidou-1first shotAfter the United States and RussiaChina becomes the third in the worldCountries that have established satellite navigation systems

2002In order not to rely too much on GPSInitiated by the European Union"Galileo" satellite programat this timeChinaBeidou-2Encountering technical bottlenecksEU lacks R&D fundsdecided by both partiesjoint development 

Chinese payment2.7After the franchise fee of 100 million eurosNot onlyNo access to core technologyalsoNo right to discusscompletely excludedthenChina decides to go it alone 

at this timeChoking Beidou by the throatThe second hurdle

hydrogen atomic clock

Satellite positioning in spaceIt’s time to calculate spaceAtomic clock istiming tool 

thenonlyUSAandEuropean UnionMastering Atomic Clock TechnologypreviouslyChina buys atomic clocks from a European companyBut after China decided to go it alonetemporarily againNot for saleThe scientists had no choice but to groan.walked upThe road to independent research and development of atomic clocks fortunatelyIt only took two yearsChinese atomic clock launched300Only error in ten thousand years1Second

Beidou-2's flight to heavensolvedAsia Pacific positioning issuesImmediately afterwardssecond yearWenchuan outbreakMagnitude 8 earthquakeRoads, electricity, and communications were disrupted in Yingxiu, the epicenter of the earthquake.Lost contact with the outside worldTens of thousands of people are still alive and dead. earthquake20hours laterfirst unitBreaking through the death lineWalking into YingxiuWith the help of aBeidou terminalFinally able to send out a distress messageThis is what the epicenter of the earthquake spread to the outside world.first message

2009After solving the domestic and Asia-Pacific region positioning issuesBeidou-3 begins to look at the worldEstablishGPSHit head onThe third test

Unable to establish ground stations overseas

Since it is not allowed to be built overseasThen we simply build a bridge for global satellites

The post-80s generation of Beidou teamproposed"Inter-satellite link"clever trick

Here comes the problemWhere is the inter-satellite link?

Strictly speaking, it is to enable global satellite interconnection. As long as there is one satellite in China's airspace, all satellites can contact domestic ground stations through it.

To put it bluntly, it means bringing all satellites into a group to share their positions.

2017Equipped with “WeChat Group” technologyBeidou-3Successfully launched

2020June 23The last Beidou satellite was launched successfully in XichangSo fartime consuming26Yearemission55satellitesinvest120billion30Thousands of people participatedspanning three generationsChina Beidou completes deployment of global satellite navigation system

26today years laterOur fishing boats and shipsIn the event of danger or threatnot only guaranteeReal-time on-site positioningIt can also be sent out immediately1000word for helpno longer be controlled by others

thanks toBeidou teamof30Thousands of peopleHang Chi Hang Chisilently studying9490day and night

AlthoughBeidou technology looks very unpredictable

Positioning, communication and timing functions are very down-to-earth

Beidou guides the wayThe dragon enters the seaShenzhou FeitianMozi GuanyuWandering in HeavenJade Rabbit Flying to the Moon

Beidou not only achieves global positioning and takes back the initiative Now Your Majesty has a minister, just like the sky has a Beidou. Dou is the mouthpiece of Heaven, and Shangshu is also the mouthpiece of His Majesty. ——《后汉书·李固传》

It is also realizing what the ancients didromantic cosmic dream as the worldThe earliest development of astronomyone of the countriesThe ancients loved the Big Dipper deeplyXia Dynasty used it to determinefirst monthandJuneThe Warring States Period used it to determineSoutheast, NorthwestandSpring, summer, autumn and winter

If the handle of the bucket points to the east, everything will be spring; if the handle of the bucket points to the south, everything will be summer; if the handle of the bucket points to the west, everything will be autumn;The handle of the bucket points north, and it is winter all over the world.——"He Guanzi? Circulation" in the Warring States Period,Zhou Dynasty used it to drink wine

Poets from all dynasties used it to drink wine and compose poems.

as the only existingFour ancient civilizationsChina's Beidou project is pointing to the futureIt is also continuingFive thousand years of China at this timeThe Beidou team is riding a time shuttleIn the team80and90backsinging"The stars in the sky join the Big Dipper"Responding to Du Fu

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