China launches eighth satellite for indigenous global navigation, positioni

[houshanghai]

China launches eighth satellite for indigenous global navigation, positioning network

English.news.cn 2011-04-10 06:28:50 FeedbackPrintRSS

A Long March-3A carrier rocket lifts off at the Xichang Satellite Launch Center in southwest China's Sichuan Province, Apr. 10, 2010. China successfully launched into space a eighth orbiter for its independent satellite navigation and positioning network known as Beidou, or Compass System here Saturday. (Xinhua/Luo Xiaoguang)


XICHANG, Sichuan, April 10 (Xinhua) -- China early Sunday morning successfully launched its eighth orbiter which will form part of its indigenous satellite-navigation and -positioning network.

A Long March-3A carrier rocket carrying the "Beidou," or Compass, navigation satellite took off at 4:47 a.m. Sunday from the Xichang Satellite Launch Center in southwest China's Sichuan Province.

It will join seven other satellites already in orbit to form a network which will eventually consist of more than 30 satellites.

The launching of the satellite marks the establishment of a basic system for the navigation and positioning network, said an unidentified spokesperson for the Xichang Satellite Launch Center.

China will launch more satellites within the coming two years to finish a regional network to provide navigation services with high precision and credibility for industries and sectors such as mapping, fishery, transportation, meteorology and telecommunication, in the Asia-Pacific regions, the spokesperson said.

The network is scheduled to be able to provide global services by 2020.

A Long March-3A carrier rocket lifts off at the Xichang Satellite Launch Center in southwest China's Sichuan Province, Apr. 10, 2010. (Xinhua/Luo Xiaoguang)


[video]http://www.tudou.com/v/5r-qooaFols/&rpid=20659917/v.swf[/video]

 

[Aramsogo]

You guys always launch at night so failures won't be shot from a clear sky. It's commie tradition, I guess.

What failures?? Put the crack pipe down!!

China - Long March (2010) - 15 / 15
Russia - Proton - 10 / 11
USA - Taurus XL - 6 / 9

 

[rcrmj]

You guys always launch at night so failures won't be shot from a clear sky. It's commie tradition, I guess.

apart from stupid lack of knowledge trolling what else can u do?

launch time is not a random decision like ur failed life, its a precise calculation of the orbit, weather etc```

besides according to ur monoric theory, big fireworks are always more obvious during night than day light``thats why humans doing fireworks in the night not like unkonw species like u``

 

[Aramsogo]

Good point rcrmj. Ao333's statement is self contradictory.
I've never seen any real fireworks (not launch failures) during the day.

 

[Aramsogo]

Self-delete.

 

[Nan Yang]

Night launches are so that it can be easily optically tracked.

 

[Huan]

Lol. ao333 is trolling.

 

[ao333]

apart from stupid lack of knowledge trolling what else can u do?

launch time is not a random decision like ur failed life, its a precise calculation of the orbit, weather etc```

besides according to ur monoric theory, big fireworks are always more obvious during night than day light``thats why humans doing fireworks in the night not like unkonw species like u``

Are you serious China boy? Orbit launches are time-irrelevant. Distance "calculations" only apply to moon/planatery landings, like for our Moon and Mars.

During clear skies, sunlight blinds all optic devices including your eyes when flying objects pass a certain height where when viewed on the ground, is in sync with the sun itself.

Your fireworks analogy is absurd as rockets rarely explode 200m off surface but dim down and tilt out of trajectory when failures occur. Most rockets accomplish this when it reaches the 3rd stage at which point the flare from its boosters can seldom be seen with bare eyes. Hence the reason commies like to do it during night so an ignition faliure will not be recorded with personal cameras but state-sanctioned footage.

It's common sense, but you guys preceive it as troll. Saddle your patriotism; I'm beginning to side with Gambit on Chinese' lack of basic scientific knowledge...

You guys seriously don't know why some countries launch at night...?

 

[oct605032048]

This is the 137th successful launch of Changzheng, good job!

 

[conworldus]

Are you serious China boy? Orbit launches are time-irrelevant. Distance "calculations" only apply to moon/planatery landings, like for our Moon and Mars.

During clear skies, sunlight blinds all optic devices including your eyes when flying objects pass a certain height where when viewed on the ground, is in sync with the sun itself.

Your fireworks analogy is absurd as rockets rarely explode 200m off surface but dim down and tilt out of trajectory when failures occur. Most rockets accomplish this when it reaches the 3rd stage at which point the flare from its boosters can seldom be seen with bare eyes. Hence the reason commies like to do it during night so an ignition faliure will not be recorded with personal cameras but state-sanctioned footage.

It's common sense, but you guys preceive it as troll. Saddle your patriotism; I'm beginning to side with Gambit on Chinese' lack of basic scientific knowledge...

You guys seriously don't know why some countries launch at night...?

Does it make you cry that the Chinese rockets launched successfully?

 

[below_freezing]

Are you serious China boy? Orbit launches are time-irrelevant. Distance "calculations" only apply to moon/planatery landings, like for our Moon and Mars.

During clear skies, sunlight blinds all optic devices including your eyes when flying objects pass a certain height where when viewed on the ground, is in sync with the sun itself.

Your fireworks analogy is absurd as rockets rarely explode 200m off surface but dim down and tilt out of trajectory when failures occur. Most rockets accomplish this when it reaches the 3rd stage at which point the flare from its boosters can seldom be seen with bare eyes. Hence the reason commies like to do it during night so an ignition faliure will not be recorded with personal cameras but state-sanctioned footage.

It's common sense, but you guys preceive it as troll. Saddle your patriotism; I'm beginning to side with Gambit on Chinese' lack of basic scientific knowledge...

You guys seriously don't know why some countries launch at night...?

Except for the fact that no failures have occured for 100+ times in a row

Also, unless you're an expert in orbital mechanics, please don't say launching to orbit is time invariant.

Basics of Space Flight: Orbital Mechanics

Launch Windows

Similar to the rendezvous problem is the launch-window problem, or determining the appropriate time to launch from the surface of the Earth into the desired orbital plane. Because the orbital plane is fixed in inertial space, the launch window is the time when the launch site on the surface of the Earth rotates through the orbital plane. The time of the launch depends on the launch site's latitude and longitude and the satellite orbit's inclination and longitude of ascending node.

 

[Akasa]

Are you serious China boy? Orbit launches are time-irrelevant. Distance "calculations" only apply to moon/planatery landings, like for our Moon and Mars.

During clear skies, sunlight blinds all optic devices including your eyes when flying objects pass a certain height where when viewed on the ground, is in sync with the sun itself.

Your fireworks analogy is absurd as rockets rarely explode 200m off surface but dim down and tilt out of trajectory when failures occur. Most rockets accomplish this when it reaches the 3rd stage at which point the flare from its boosters can seldom be seen with bare eyes. Hence the reason commies like to do it during night so an ignition faliure will not be recorded with personal cameras but state-sanctioned footage.

It's common sense, but you guys preceive it as troll. Saddle your patriotism; I'm beginning to side with Gambit on Chinese' lack of basic scientific knowledge...

You guys seriously don't know why some countries launch at night...?

Oh wait, so since many Shuttle launches are during the night, then all the footage must be US state-sanctioned, right?

And why does China need to be afraid of failures when their success rate is 95%?

Your so-called "common sense" is as pathetic as your argument, Canada boy.

 

[ao333]

Except for the fact that no failures have occured for 100+ times in a row

Also, unless you're an expert in orbital mechanics, please don't say launching to orbit is time invariant.

LOL, the orbit of a satellite depends on 2 factors: location and time of launching. The lattitude of the earth, even at the same degree allows more satellite than the world has. The fact that you guys choose to launch during night on Tibetan territory which is of a higher attitude (appropriate) and receives significantly more day time than the rest of China means one thing: you want to hide faliures.

PS: Both the Sputnik you guys' Dong Fang Hong song bird were fired up during night with no independent journalists allowed near the site. In stark contrast, the Apollo succeeded in broad day light with hoards of international paparazzi.

As concession to end this spiralling troll, I'd like to say congratulations! And please contain the rocket launches in one thread. Maybe make a new one when the Chinese Global PS Beidou2 system comes into play?

 

[ChinaToday]

Are you serious China boy? Orbit launches are time-irrelevant. Distance "calculations" only apply to moon/planatery landings, like for our Moon and Mars.

During clear skies, sunlight blinds all optic devices including your eyes when flying objects pass a certain height where when viewed on the ground, is in sync with the sun itself.

Your fireworks analogy is absurd as rockets rarely explode 200m off surface but dim down and tilt out of trajectory when failures occur. Most rockets accomplish this when it reaches the 3rd stage at which point the flare from its boosters can seldom be seen with bare eyes. Hence the reason commies like to do it during night so an ignition faliure will not be recorded with personal cameras but state-sanctioned footage.

It's common sense, but you guys preceive it as troll. Saddle your patriotism; I'm beginning to side with Gambit on Chinese' lack of basic scientific knowledge...

You guys seriously don't know why some countries launch at night...?

stupid troll like you make me laugh and yeah lunching big operation like this we have to do it secretely under the dark of night so no body can see it LMAO

 

[lcloo]

Timing of space launch is relevant, and is called Launch Window. If a launch window is missed, another one may be available after days or even weeks, depending on thr target point in space.

From Wiki

Launch window
Launch window is a term used in spaceflight to describe a time period in which a particular launch vehicle (rocket, Space Shuttle, etc.) must be launched. If the rocket does not launch within the "window", it has to wait for the next window.[1]

For trips into largely arbitrary Earth orbits, almost any time will do. But if the spacecraft intends to rendezvous with a space station (such as the International Space Station) or another vehicle already in an orbit, the launch must be carefully timed to occur around the times that the target vehicle's orbital plane intersects the launch site.

For launches above low Earth orbit (LEO), the actual launch time can be somewhat flexible if a parking orbit is used, because the inclination and time the spacecraft initially spends in the parking orbit can be varied. See the launch window used by the Mars Global Surveyor spacecraft to the planet Mars at [1].

To go to another planet using the simple low-energy Hohmann transfer orbit, if eccentricity of orbits is not a factor, launch windows are periodic according to the synodic period; for example, in the case of Mars the period is 2.135 years, i.e. 780 days. In more complex cases, including the use of gravitational slingshots, launch windows are irregular. Sometimes rare opportunities arise such as when Voyager 2 took advantage of 175 year planetary alignment (launch window) to visit Jupiter, Saturn, Uranus and Neptune. When such an opportunity is missed, another target may be selected. For example, the Rosetta mission of ESA was originally intended for comet 46P/Wirtanen, but a launcher problem delayed it and a new target had to be selected (comet 67P/Churyumov-Gerasimenko).

Launch windows are often calculated from porkchop plots that show the delta-v needed to achieve the mission, plotted against the launch time.

[edit] Specific issuesSpace Shuttle missions to the International Space Station are restricted by beta angle cutout. Beta angle (&#946 is defined as the angle between the orbit plane and the vector from the Sun.[2] Due to the relationship between an orbiting object's beta angle (in this case, the ISS) and the percent of its orbit that is spent in sunlight, solar power generation and thermal control are affected by that beta angle.[3] Shuttle launches to the ISS are normally only attempted when the ISS is in an orbit with a beta angle of less than 60 degrees.[3]