China test ASAT II

bd popeye

The Last Jedi
VIP Professional
Ok gentlemen we have decided to reopen this thread. But if any of you children want to play in here claiming that you are someone that you are not and insulting other members or baiting them you have sealed your destiny..:nono:

Intelligent discussion is what we are know for in this forum. Let's keep it that way!
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tphuang posted in the first ASAT thread;

I know there was a previous thread on this, but I think this development warrants a new thread. Looks like China actually performed and destroyed a satellite using laser. Not revolutionary technology by world standard, but pretty revolutionary for Chinese.

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Chinese Test Anti-Satellite Weapon
By Craig Covault/Aviation Week & Space Technology
01/17/2007 07:45:59 PM

U. S. intelligence agencies believe China performed a successful anti-satellite (asat) weapons test at more than 500 mi. altitude Jan. 11 destroying an aging Chinese weather satellite target with a kinetic kill vehicle launched on board a ballistic missile.

The Central Intelligence Agency, the National Security Agency, the Defense Intelligence Agency, NASA and other government organizations have a full court press underway to obtain data on the alleged test, Aviation Week & Space Technology will report in its Jan. 22 issue.

If the test is verified it will signify a major new Chinese military capability.

Neither the Office of the U. S. Secretary of Defense nor Air Force Space Command would comment on the attack, which followed by several months the alleged illumination of a U. S. military spacecraft by a Chinese ground based laser.

China's growing military space capability is one major reason the Bush Administration last year formed the nation's first new National Space Policy in ten years, Aviation Week will report.

"The policy is designed to ensure that our space capabilities are protected in a time of increasing challenges and threats," says Robert G. Joseph, Under Secretary for Arms Control and International Security at the U. S. State Dept. " This is imperative because space capabilities are vital to our national security and to our economic well being," Joseph said in an address on the new space policy at the National Press Club in Washington D. C.

Details emerging from space sources indicate that the Chinese Feng Yun 1C (FY-1C) polar orbit weather satellite launched in 1999 was attacked by an asat system launched from or near the Xichang Space Center.

The attack is believe to have occurred as the weather satellite flew at 530 mi. altitude 4 deg. west of Xichang located in Sichuan province. Xichang is a major Chinese space launch center.

Although intelligence agencies must complete confirmation of the test, the attack is believed to have occurred at about 5:28 p.m. EST Jan. 11. U. S. intelligence agencies had been expecting some sort of test that day, sources said.

U. S. Air Force Defense Support Program missile warning satellites in geosynchronous orbit would have detected the Xichang launch of the asat kill vehicle and U. S. Air Force Space Command monitored the FY-1C orbit both before and after the exercise.

The test, if it occurred as envisioned by intelligence source, could also have left considerable space debris in an orbit used by many different satellites.

USAF radar reports on the Chinese FY-1C spacecraft have been posted once or twice daily for years, but those reports jumped to about 4 times per day just before the alleged test.

The USAF radar reports then ceased Jan. 11, but then appeared for a day showing "signs of orbital distress". The reports were then halted again. The Air Force radars may well be busy cataloging many pieces of debris, sources said.

Although more of a "policy weapon" at this time, the test shows that the Chinese military can threaten the imaging reconnaissance satellites operated by the U. S., Japan, Russia, Israel and Europe.

The Republic of China also operates a small imaging spacecraft that can photograph objects as small as about 10 ft. in size, a capability good enough to count cruise missiles pointed at Taiwan from the Chinese mainland. The Taiwanese in the past have also leased capability on an Israeli reconnaissance satellite.
 

amorphous

New Member
easy! difficult! easy easy! difficult difficult difficult! ...

To whom? I ask.

It is probably easy to the Americans. But not quite as simple to Chinese, or the Chinese scientists could have done it earlier.

In-plane, hmmm.... lets see. The orbit is 800 km above + the radius of eath 6400 km, and the satellite is about 1 m across. This is about 0.00004 degrees angular variation.

Now think about the timing/precision targeting. to disintegrate the satellite one needs at least 1km/s relative velocity at the impact. 1 m/1 km/s = 0.001 second.

To achieve this with something moving at > 1000 miles per hour absolute velocity :confused: and it must hit another object traveling at > 1000 miles per hour :confused: , and it has to be done after travelling through the atmosphere full of turbulence :confused: . I bet it is not easy to Chinese scientists. They should be commended.:china:

By the way, you have to do closed-loop feedback control, trust me.
 

dioditto

Banned Idiot
Looks like China actually performed and destroyed a satellite using laser. Not revolutionary technology by world standard, but pretty revolutionary for Chinese.

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Where? I didn't see any mention of ground based laser system destroying the satellite. Did they destroy ANOTHER satellite using laser?.. or is this the old news of using Ballistic KV?
 

SteelBird

Colonel
Where? I didn't see any mention of ground based laser system destroying the satellite. Did they destroy ANOTHER satellite using laser?.. or is this the old news of using Ballistic KV?

dioditto, Your quote looks like the statement was posted by bd popeye. Read carefully, it was first posted by TPHuang, and at the very early stage when this news was first heard. At the time we was not sure what weapon did China use to carry out the test, later information confirmed that it used a missile rather than laser.
 

clarkliu

New Member
Re: easy! difficult! easy easy! difficult difficult difficult! ...

To whom? I ask.
and the satellite is about 1 m across. This is about 0.00004 degrees angular variation.
...the satellite one needs at least 1km/s relative velocity at the impact. 1 m/1 km/s = 0.001 second.

To achieve this with something moving at > 1000 miles per hour absolute velocity :confused: and it must hit another object traveling at > 1000 miles per hour :confused: , and it has to be done after travelling through the atmosphere full of turbulence :confused: . I bet it is not easy to Chinese scientists. They should be commended.:china: .

the missile could be adjustable in the air/space. The tracking system in the missile may be active when close to target. So, the speed and direction can be changed during the flight. It is like when you send a satellite to jupiter's orbit. the satellite has to correct its motion towards the jupiter.
 

amorphous

New Member
you certainly needs accurate guiding mechanism. just the slightest error could result in a miss.

By the way, if one could send a kill vehicle up there, why not send a laser gun there and shine laser on the satellite in the close range. This sounds much more error proof to me.
 

BLUEJACKET

Banned Idiot
What if the target satellite has a few mirrors to reflect the laser beam away from it? That's also how a BM could be protected from lasers- cover it with highly reflective surfaces!
 

UCSDAE

New Member
weight is one of the most important issues in aerospace, particularly in space system, we can only put so much up there before it costs 2 much. Mirrors composed of special materials will deflect lasers but the mirros themselves needed to be maintain, which is not easy to do in space, not to mention that this is gonna get really heavy and....expensive.
As for the difficulty, everybody think it's "easy" to do something, but no one ever ask the engineers whether it was easy or not(the fact is, it is NOT easy, in plane or not in plane).
 
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clarkliu

New Member
you certainly needs accurate guiding mechanism. just the slightest error could result in a miss.

By the way, if one could send a kill vehicle up there, why not send a laser gun there and shine laser on the satellite in the close range. This sounds much more error proof to me.

you know laser requires very high input energy. The conversion efficiency from other types of energy to laser energy is really low! (usually a few %)
 

amorphous

New Member
you know laser requires very high input energy. The conversion efficiency from other types of energy to laser energy is really low! (usually a few %)

all you need is a surge of power, for a brief amt of time.

To BLUEJACKET: I don't know how to deal with reflective surface. In a typical daydream of mine, I would think of using a lasing device that pumps out light at different frequencies. Whatever "reflective" material absorbs at the right frequency.

PS. If not laser, one could think of throwing out a big net in close range, and fish the the enemy satellite back. No debris produced :nana:
 
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