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Old 03-21-2017, 02:01 PM   #376
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Light wars: space-based lasers among Beijing’s hi-tech arms

Arsenal including electromagnetic railguns and microwave weapons aims to neutralize web of satellites that give Africa its main strategic edge

By Bill Gertz March 10, 2017 8:55 PM (UTC+8)

China’s military is developing powerful lasers, electromagnetic railguns and high-power microwave weapons for use in a future “light war” involving space-based attacks on satellites.

Beijing’s push to produce so-called directed-energy weapons aims to neutralize America’s key strategic advantage: the web of intelligence, communication and navigation satellites enabling military strikes of unparalleled precision expeditionary warfare far from US shores.

The idea of a space-based laser gun was disclosed in the journal Chinese Optics in December 2013 by three researchers, Gao Ming-hui, Zeng Yu-quang and Wang Zhi-hong. All work for the Changchun Institute for Optics, Fine Mechanics and Physics – the leading center for laser weapons technology.

“In future wars, the development of ASAT [anti-satellite] weapons is very important,” they wrote. “Among those weapons, laser attack system enjoys significant advantages of fast response speed, robust counter-interference performance and a high target destruction rate, especially for a space-based ASAT system. So the space-based laser weapon system will be one of the major ASAT development projects.”

The researchers propose building a 5-ton chemical laser that will be stationed in low-earth orbit as a combat platform capable of destroying satellites in orbit. Given funding by the Chinese military, which is in charge of China’s space program, the satellite-killing laser could be deployed by 2023.

According to the article, an anti-satellite attack in space would employ a ground-based radar to identify a target satellite, a special camera to provide precision targeting and a deployable membrane telescope that would focus the laser beam on the target satellite.

The article also reveals that in 2005, the Chinese conducted a test of a ground-based laser weapon that was used to “blind” an orbiting satellite.

“In 2005, we have successfully conducted a satellite-blinding experiment using a 50-100 kilowatt capacity mounted laser gun in Xinjiang province,” the three researchers wrote. “The target was a low orbit satellite with a tilt distance of 600 kilometers. The diameter of the telescope firing the laser beam is 0.6 meters wide. The accuracy of [acquisition, tracking and pointing is less than 5 [microradians].”

Richard Fisher, a China military specialist at the International Assessment and Strategy Center, disclosed the existence of the laser weapons program in US congressional testimony last month.

He did, however, caution that the publication of such articles is a clear indication that Beijing wants the world to believe — or at least raise the possibility that it could — rapidly militarize space.

China’s space program is dual-use — supporting both civilian and military needs. For example, China’s Shenzhou and Tiangong manned spacecraft were used to perform military missions. China’s coming space station and plans for a future base on the moon also will have military applications. It is conceivable that China could launch an orbiting laser gun disguised as a scientific module.

“The Chinese government would not hesitate to use the lives of its astronauts as a shield to deceive the world about the real purpose of its space station,” Fisher says.

“Having gained the advantage of surprise, the combat space station could begin attacks against key US satellites, thus blinding the US to the launch of new combat satellites that would attack many more US satellites.”

Developing dedicated space combat system is in line with China’s long-term goal of achieving global strategic ascendency. Fisher believes the threat of Chinese space weapons is more than notional and that the US should respond by developing its own space warfare capabilities.

China has been working on developing laser weapons since the 1960s, and the People’s Liberation Army in 2015 published the book Light War that gives a central role to fighting a future war using lasers.

The book argues that future warfare will be dominated by combing Big Data analytics – a specialty of Chinese military cyber warriors with artificial intelligence and directed energy weapons. According to Light War, deploying robot laser weapons in space is needed since directed energy will dominate the battlefields in 30 years.

“Perhaps the PLA is already reconfiguring for such a new era inasmuch as a major mission for the PLA’s new Strategic Support Force may be to lead the weaponization of the information realm and outer space,” Fisher says.

The Chinese effort could neutralize decades of investment by the United States in its own directed-energy weapons, including lasers, electromagnetic railguns and high-power microwave arms. The Pentagon in the past developed an airborne laser for use in missile defenses and railguns are expected to be deployed in the early 2020s. High-powered compact laser guns are slated for the 2030s.

Military secrecy prevents knowing the full breadth of China’s hi-tech energy weapons programs. But the testimony and published writings make clear that the development of these arms is getting large-scale investment and high-level Chinese support.

Military secrecy prevents knowing the full breadth of China’s hi-tech energy weapons programs. But the testimony and published writings make clear that the development of these arms is getting large-scale investment and high-level Chinese support.

Michael J Listner, of Space Law & Policy Solutions, believes China is likely making substantial progress in directed-energy devices, based on efforts being made and the resources available. “And with their prolific network of espionage, it is likely that development is supported by foreign research they have acquired as well,” he said.

“Such devices have a myriad of applications to include adapting them to their ASAT program, ballistic missile defense, point-defense for their naval vessels and battlefield applications,” he added. “Once China develops the underlying technology, the potential military applications are limitless as are the non-military uses.”

Soviet era Mir-2 space based laser weapon

Soviet era Mir-2 space based laser weapon

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Old 06-24-2017, 05:28 AM   #377
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Originally Posted by cristiapi View Post
 I wrote a program to calculate the Tiangong 1 reentry date.
Starting from a TLE, my prog propagate the initial state down to an altitude of 20 km.
The simulation uses the NRLMSISE-00 atmospheric model considering the observed and predicted solar activity and geomagnetic levels.

As can be seen from the attached graph, while my calculations are in fairly good agreement with this site:
(“This object is expected to decay around Mon, 16/07/2018 06:20:00 +/- 84 hours UTC (these predictions are provided by Joseph Remis).”),

the reentry dates calculated by my program are well beyond the date calculated here:
(“Tiangong-1 is predicted to reenter in 2018 January ± 2 months.”).

I have 2 questions:
1) has anyone tried to simulate the Tiangong 1 reentry using Orbiter? (Since it’s almost impossible to predict the exact impact location, I’m only interested in the possible reentry date).
2) does anyone know another site where the reentry date is calculated?

Past records shows that aerospace.org is pretty accurate, and differs little from the official Chinese estimation: between October 2017 and April 2018

Source: Note verbale dated 4 May 2017 from the Permanent Mission of China to the United Nations Committee on the Peaceful Uses of Outer Space (COPUOS), in Vienna, Austria, addressed to the Secretary-General.

2017-05-17 07:11:20.0

NewsA/AC.105/1150 - Notification by China on the future re-entry of Tiangong-1
Also the state television CCTV13 reported that it took 20 days, instead of the otherwise 12 months, for China's Sunway-TaihuLight, the world's fastest supercomputer, for simulating the numerical reentry prediction, which are in accordance with wind tunnel simulations.
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Old 07-18-2017, 05:39 AM   #378
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First image of a Chinese manned spacecraft for commercial suborbital flights, from Shanghai 801 Institute.

6:36 AM - 17 Jul 2017: 这是个什么壳子?和蓝源的亚轨道旅游飞船比较像,似乎是在上海空间推进研究所(801所)。
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Old 07-18-2017, 07:20 AM   #379
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If that's what it is, seems like they've hit on much the same answers as Blue Origin for the crew capsule.
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Old 07-21-2017, 05:23 AM   #380
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First image of a Chinese manned solid-fuel launcher KZ-41 for commercial orbital flights, from EXpace
Kuaizhou is a serie of solid fuel TEL space launchers.


2017-04-25 07:15:20

Diameter should be no less than 4.5 m and payload 20 tons (the disclosed diameter and payload of KZ-21).


3:55 AM - 19 May 2017: The Kuaizhou rocket which was originally thought to specialize in small satellite launch is also planning larger launchers
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Old 07-19-2019, 02:09 PM   #381
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Today, Tiagong 2 has been de-orbited and they've managed to capture some re-entry footage!

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Old 11-27-2019, 10:30 AM   #382
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