Navigating The Cosmos With Space GPS

Image via: DiscoveryMagazine.com

Spacecraft could one day navigate through the cosmos using a particular type of dead star as a kind of GPS.

German scientists are developing a technique that allows for very precise positioning anywhere in space by picking up X-ray signals from pulsars.

These dense, burnt-out stars rotate rapidly, sweeping their emission across the cosmos at rates that are so stable they rival atomic clock performance.

This timing property is perfect for interstellar navigation, says the team.

If a spacecraft carried the means to detect the pulses, it could compare their arrival times with those predicted at a reference location. This would enable the craft to determine its position to an accuracy of just five kilometres anywhere in the galaxy.

"The principle is so simple that it will definitely have applications," said Prof Werner Becker from the Max-Planck Institute for Extraterrestrial Physics in Garching.

"These pulsars are everywhere in the Universe and their flashing is so predictable that it makes such an approach really straightforward," he told BBC News.

The proposed technique is very similar to that employed in the popular Global Positioning System, which broadcasts timing signals to the user from a constellation of satellites in orbit.

Currently, mission controllers wanting to work out the position of their spacecraft deep in the Solar System will study the differences in time radio communications take to travel to and from the satellite. It is a complex process and requires several antennas dotted across the Earth.

It is also a technique that is far from precise, and the errors increase the further away the probe moves.

For the most distant spacecraft still in operation - Nasa's Voyager probes, which are now approaching the very edge of the Solar System, some 18 billion km away - the errors associated with their positions are on the order of several hundred km.

Even for a probe at the reasonably short separation of Mars, the positioning uncertainty can be about 10km.

"It becomes possible with the development of lightweight X-ray mirrors," said Prof Becker.

"These are on the way for the next generation of X-ray telescopes. Current mirrors have a 100 times more weight and would be completely unusable.

"In 15-20 years, the new mirrors will be standard and our device will be ready to be built."

The scientist believes his navigation solution will certainly find use on Solar System probes, providing autonomous navigation for interplanetary missions and perhaps for future manned ventures to Mars where high performance systems will be an absolute requirement for safety reasons.

Via: "The BBC"

DHS Emergency Power Extended

The Obama administration has given the Department of Homeland Security powers to prioritize government communications over privately owned telephone and Internet systems in emergencies.

An executive order signed June 6 “gives DHS the authority to seize control of telecommunications facilities, including telephone, cellular and wireless networks, in order to prioritize government communications over private ones in an emergency,” said Amie Stephanovich, a lawyer with the Electronic Privacy Information Center (EPIC).

The White House says Executive Order 13618, published Wednesday in the Federal Register, is designed to ensure that the government can communicate during major disasters and other emergencies and contains no new authority.

“The [order] recognizes the creation of DHS and provides the Secretary the flexibility to organize the communications systems and functions that reside within the department as [she] believes will be most effective,”White House spokeswoman Caitlin Hayden said in an email. “The [order] does not transfer authorities between or among departments.”

She said the order replaced one originally signed in 1984 by President Reagan and amended in 2003 by President George W. Bush after DHSwas set up and took responsibility for emergency response and communications.

When the original order “was written during the Cold War, the motivating national security concern was maintaining communications capability following a devastating nuclear strike,” Ms. Hayden said.

The new order “address[es] a world in which our economy and government are far more reliant on communications technologies to maintain essential functions than we were then,” she wrote.

At issue is a provision of the four-page order that says Homeland Security Secretary Janet A. Napolitano “shall … satisfy [federal] priority communications requirements through the use of commercial, government, and privately owned communications resources.”

“The previous orders did not give DHS those authorities over private and commercial networks,” Ms. Stepanovich said. “That’s a new authority.”

“This should have been done by Congress, so there could have been proper debate about it,” she added. “This is not authority that should be granted by executive order.”

Ms. Hayden said the legal basis for the order is Section 706 of the 1934 Communications Act. The section authorizes the president to “cause the closing of any facility or station for wire communication” and gives him “control of any such facility or station” if a state of war, or the threat of one, exists.

The new order “extends Section 706 powers to the Internet,” said James Harper, an electronic-privacy advocate at the Cato Institute, a libertarian think tank.

The authorities “might have made sense in the 1930s,” but now the communication networks are too complex and interdependent, he said. “If you try to seize control of the Internet that way, you will break it.”

Under the previous executive orders, communications providers have long established priority access programs for federal users. In the telephone system, a special code the user inputs before dialing a number automatically tells the phone companies’ equipment to give the call priority.

“Mobile phones, the Internet, and social media are all now integral to the communications landscape,” Ms. Hayden said.

Via: "The Washington Times"

Israel Has One Of World's Largest 'EavesDropping' Bases

The base, near Kibbutz Urim, is central to the activities of the main Israel Defense Forces signals intelligence unit, 8200, according to report in Le Monde Diplomatique.

By Yossi Melman
Published 01:19 05.09.10
Latest update 01:19 05.09.10
Courtesy Of "Haaretz NewsPaper"

Israel has one of the largest signals intelligence (SIGINT) bases in the world in the western Negev, Le Monde Diplomatique reported. The base, near Kibbutz Urim, is central to the activities of the main Israel Defense Forces signals intelligence unit, 8200, the report says.

According to the report, the base has 30 antennas and satellite dishes of different sizes and types, capable of eavesdropping on telephone calls and accessing the e-mail of "governments, international organizations, foreign companies, political groups and individuals."

One of the base's main purposes is to listen to transmissions from ships passing in the Mediterranean, the report says. The base is also the center of intelligence activity that "taps underwater communication cables, mostly in the Mediterranean, connecting Israel with Europe."

The data collected at the Negev site is relayed for processing to a 8200 base near Herzliya, the paper says. Other reports say 8200's base is near the Mossad headquarters, which receives the intelligence along with IDF units, the paper says.

The report quotes a former soldier in 8200 who said her job was to intercept telephone calls and e-mails in English and French.

"It was very interesting work, which centered on locating and identifying the 'gems' out of routine communications," she said.

The report says that the base's antennas can be identified if you go to the right websites. The antennas there are lined up in rows, it says.

The author of the article, Nick Hager, is a New Zealand investigative reporter specializing in intelligence and technology related stories involving signals intelligence. In 1996 he wrote a book on the role of New Zealand in international intelligence gathering, and discussed cooperation between New Zealand, the U.S., Britain, Australia and Canada.

Le Monde Diplomatique repeats assessments in Israeli and foreign media about 8200's contribution to Israel's intelligence capabilities.

The unit has several bases, and is described as being the main body for signals intelligence collection in Israel, according to the report and other foreign media. Besides SIGINT, which involves communications, it also deals in ELINT, collecting signals from various electronic sources, including radar.

There are also 8200 units specializing in code breaking.

The unit's great, known successes include the interception of a telephone call between Egyptian president Gamal Abdel Nasser and King Hussein of Jordan during the first day of the Six-Day War, and the interception of the telephone call between Yasser Arafat and the terrorist group that hijacked the Achille Lauro cruise ship in the Mediterranean in 1985.

Hager compares the Urim base's capabilities to those of the U.S. National Security Agency, Britain's Government Communications Headquarters and a similar organization in France.

"However, there is one difference," he says at the end of the report. While those units were uncovered long ago, "the unit at Urim remained unknown until this report."

China's Secure Communications Quantum Leap

By Matthew Luce
August 26, 2010
Courtesy Of "Asia Times Online"

A team of 15 Chinese researchers from Tsinghua University in Beijing and the Hefei National Laboratory for Physical Sciences, a government-directed research center, in May published a research paper announcing a successful demonstration of "quantum teleportation" (liangzi yinxing chuan) over 16 kilometers of free space.

These researchers claimed to have the first successful experiment in the world. The technology on display has the potential to revolutionize secure communications for military and intelligence organizations and may become the watershed of a research race in communication and information technology.

Although much of the science behind this technology is still young, quantum technologies have wide-ranging applications for the fields of cryptography, remote sensing and secure satellite
communications. In the near future, the results from this experiment will be used to send encrypted messages that cannot be cracked or intercepted, and securely connect networks, even in remote areas, with no wired infrastructure, even incorporating satellites and submarines into the link [1].

Roots In Quantum Physics, Applications In Intelligence

Rather than transporting matter from place to place, quantum teleportation's most practical applications currently involve using photons for instantaneous, almost totally secure data communication. Using the term "teleportation" to describe this effect can be justified by what Albert Einstein called "spooky action at a distance": after two particles are linked together through quantum entanglement, any change in the state of one particle immediately alters the other, even from kilometers away. In effect, the state of the particle at the sender's end is destroyed and reappears as an exact replica at the receiver's end, with a negligible chance of undetected third-party interception [2].

While the teleportation of physical matter remains science fiction at this point, quantum teleportation could be immediately implemented as a means for secure communications and cryptography. Current encryption techniques are based upon mathematical functions involving very large prime numbers and secure key management and distribution, but this strategy has a number of drawbacks and is nearing the end of its shelf life.

In particular, as computing power continues to double every year and computer bits speed up through the use of quantum particles, the cryptographic keys used for encoding and decoding must now be changed more often to prevent encrypted data from being cracked. As a result, it has become very difficult to "future proof" the encryption of data, and were any major breakthrough in quantum computing to be achieved in the near future, current encryption techniques could become obsolete and encrypted data could suddenly become unprotected [3].

The security of using quantum teleportation to distribute cryptographic keys, on the other hand, is upheld by the laws of physics and has a seemingly infinite time horizon. These keys cannot currently be detected and cracked even with the help of the most powerful computers. Owing to the Heisenberg Uncertainty Principle, the quantum states of photons cannot be observed without changing the state of the particle, which has the result of immediately informing the sender and receiver of any eavesdropping. Quantum communication can thus be used to send the most sensitive information, including keys to decode encrypted data sent over less secure means.

Significance Of The China's Achievement

As a result, the issue has found itself at the center of a rapidly developing geopolitical race to apply quantum technology to military and intelligence work. Since secure quantum key distribution (QKD) provides a much higher level of security between communication networks, employing quantum teleportation over a satellite network allows for completely secure communications, even in sensitive and remote areas, without fiber optic infrastructure, as long as all parties are able to maintain line of sight with a satellite. This could have wide applications in communications and intelligence for ground troops, aircraft, surface ships and submarines, and fits into China's current plans to grow its satellite network even further.

Using quantum teleportation to send this type of information has been technically possible for several years, but according to the Chinese research paper, it had been previously demonstrated experimentally only over an enclosed fiber optics network and then only over a distance of several hundred meters [4].

The Chinese experiment appears to shatter these records by claiming to be the first to use a high-powered blue laser to exchange quantum information over a free space channel, and to demonstrate the principle over a distance as great as 16km. This distance is significant because it displays approximately the same degree of light distortion as is seen in communication from the earth's surface to a satellite, and so would allow for quantum communication using satellites. If this experiment were indeed the first of its kind, it would appear that China has succeeded in leapfrogging the West, and gained a significant edge in next-generation communications and cryptography.

A Quantum Space Race?

The Chinese claim to be the first may not be entirely accurate, although certain elements of their experiment were unique and innovative. In 2005, a group of universities and defense corporations under a Defense Advanced Research Projects Agency (DARPA) grant and led by BBN Technologies, the company responsible for developing the precursor to the Internet, succeeded in transferring cryptographic keys over a free-space link of 23 km in Cambridge, Massachusetts.

Well beyond the single link employed by the Chinese, the BBN program has developed an expanding, multi-node web of secure quantum communication that will be able to further expand and link seamlessly with existing Internet technology [5]. There are a few differences in the physics of their experiment that still make it notable and may not technically disqualify the Chinese from claiming their status as first, but nonetheless American researchers seem to have had a five-year head start in demonstrating the principles of the technology.

However, one notable difference between the Chinese and American experiments is that the Beijing experiment used a blue laser for their teleportation experiments while the BBN team had been employing infrared. Both have advantages and disadvantages in range and power, but the primary difference in their applications seems to be that blue and blue-green lasers penetrate further into water and so have wider applications for sub-surface communications. China is currently modernizing its submarine fleet as a way to project force further past its coastal waters to deter any US naval response to a potential invasion of Taiwan as well as doing significant research into laser communications in submarines [6].

Quantum laser links with satellites would allow sub-surface communication without most of the traditional downsides of radio communications and allow subs to operate with even greater autonomy and silence [7]. Judging from the interest in blue lasers for underwater communication and the interesting choice of a blue laser for the teleportation experiment, it would be safe to venture a guess that applications for quantum communication are already beginning to find their way into Chinese military research and development.

Because of its security level and applications for satellite and submarine communications, quantum communication technology figures centrally in the objectives of the Chinese military to upgrade their growing command and control capabilities. A functional satellite-based quantum communication system would give the Chinese military the ability to operate further afield without fear of message interception.

However, Chinese researchers must also be aware of the potential for the United States to employ the same technology and may be seeking ways to counter this eventuality. While it is still almost impossible to intercept quantum messages without being detected, it may be feasible to jam the laser signals that send them with "optical noise" or other lasers. Understanding the ways in which quantum cryptography functions may also eventually expose further weaknesses in the network that can be exploited by a savvy adversary.

China's continuing cutting-edge quantum cryptography, lasers and optics research thus seems as much a reaction to the same research in the United States and an attempt to counter it as it is to develop its own indigenous network.

Conclusions

All of these potential uses are motivations for Chinese labs to be the first to develop successful applications of quantum technology for immediate deployment and to claim milestones like being the first to successfully execute teleportation over several miles of free space.

Besides the military uses and academic prestige, this accomplishment could attract a significant amount of international funding for China's developing optics industry, and if quantum teleportation becomes the new paradigm for the future of secure communications, China would like to make a name for itself as the premier research and development hub. Claims of this recent "first" for China then have that much greater significance for security and the continued health of US technological superiority.

Notes

1. Jin Xian-Min, et al. "Experimental free-space quantum teleportation." Nature Photonics 4, 376 - 381 (2010). Published online: May 16, 2010 doi:10.1038/nphoton.2010.87. See also the Chinese Academy of Sciences review. 


2. Lei Zhang, Jacob Barhen, and Hua-Kuang Liu. "Experimental and Theoretical Aspects of Quantum Teleportation." Center foe Engineering Science Advanced Research, Computer Science and Mathematics Division, Oak Ridge National Laboratory (2000).

3. David Pearson, "Building a QKD Network out of Theories and Devices," BBN Technologies (December 2005).

4. The Chinese paper cites R Ursin, et al. "Quantum teleportation across the Danube" and I Marcikic, et al "Long-distance teleportation of qubits at telecommunication wavelengths," both descriptions of quantum cryptography over hundreds of meters of optical fiber.

5. Chip Elliott, et al. "Current status of the DARPA Quantum Network." In Quantum Information and Computation III, edited by Eric J. Donkor, Andrew R. Pirich, Howard E. Brandt, Proceedings of SPIE Vol. 5815 (SPIE, Bellingham, WA, 2005).

6. See Yingzhuang Liu and Xiaohu Ge, "Underwater laser sensor network: a new approach for broadband communication in the underwater." Department of Electronics & Information Engineering, Huazhong University for Science and Technology (May 2006).

7. These include detectability, the need to surface to communicate, limitations in range, and the reliance on cryptographic keys that may be cracked. 

Matthew Luce is a researcher and Chinese linguist at Defense Group Inc’s Center for Intelligence Research and Analysis, where he does primary source research and analysis of China’s science and technology policies and development programs. Mr. Luce's research and writing focuses on cyber security, C4ISR-related technologies, and China's ethnic relations. He has worked and traveled extensively in China and speaks and reads fluent Chinese. 

This article first appeared in The Jamestown Foundation. Used with permission.) 

(Copyright 2010 The Jamestown Foundation.)