Tag Archives: laser weapons

Kidnapper Satellites: war in space

It was May 2014 when a small team of American airmen monitoring a Russian satellite launch saw something they had never seen before. An object the team thought was a piece of debris from the launch suddenly came to life.  “The one object that we assumed was a piece of debris started to maneuver in close proximity to the (rocket) booster,” recalled Lt. Gen. David Buck …at Vandenberg Air Force Base in California. Buck… said the deliberate maneuvers the mystery object made close to the rocket’s booster were a red flag. Getting that close to another object in space is a complex feat, as objects can move as fast as 17,500 miles per hour….[W]hat the US military was witnessing was not debris at all, but instead a satellite with a dangerous capability, one that could allow it to cozy up next to another satellite and potentially destroy it….

The Russian satellite is officially known as Kosmos 2499 but it has been given a more daunting nickname: “kamikaze,” a spacecraft expressly designed to maneuver up close to another satellite to disable or destroy it. In other words, it’s a satellite that could go on the attack.Retired Gen. William Shelton, the former commander of Air Force space command, likened the satellite to a space Trojan horse. “You could have something on orbit that, for all intents and purposes, looks like a communications satellite, when in actuality, it is also a weapon,” said Shelton.

Kosmos 2499 is far from the only threat. In September 2014, just a few months after Kosmos was placed in orbit, Russia launched an additional satellite named Luch with both maneuvering and spying capabilities.  “This satellite has been maneuvering through geosynchronous space … cozying up close to various communications satellites, listening to what traffic is flowing over those,” said Paul Graziani, CEO of civilian satellite tracker Analytical Graphics, Inc. (AGI).

Over the course of a year, Graziani’s team has watched as Luch parked itself next to three US commercial satellites and one European satellite. The Russians flew the satellite close enough to collect both civilian and, possibly, sensitive military information.  Graziani was charged with delivering the bad news to US-owned commercial satellite company Intelsat…

“If the operators of this spacecraft so chose, they could direct it to actually hit another spacecraft,” said Graziani.  Like Kosmos, Luch’s ability to maneuver has the potential to make it into a satellite killer.

 Launched in 2013, the Shiyan, meaning “experiment” in Chinese, was “experimenting” shadowing the smaller satellite, according to AGI. But then something unexpected happened: The smaller satellite repeatedly disappeared and then reappeared on their screens.“We saw the approach, we saw the larger spacecraft come close to the smaller spacecraft, and then we no longer saw the smaller spacecraft,” said Graziani.

The only reasonable explanation, experts say, is that the Shiyan has a robotic arm that was repeatedly grabbing and then releasing its smaller partner.  The Chinese government acknowledged the satellite’s robotic arm, saying the satellite is “mainly used in space debris observation,” according to the state-run Xinhua News Agency.

But space watchers like Graziani see a more sinister application.  “You could grab and hold of a satellite and maneuver it out of its mission,” said Graziani  If true, it would be a new threatening capability, allowing the Shiyan to essentially kidnap another satellite….

Lasers:  “You can aim a laser at a satellite’s sensor and try to make it hard to see,” said Laura Grego, a scientist with the Union of Concerned Scientists. “Like someone shining a flashlight in your eyes.”With power dialed up high that same laser could permanently fry the satellite’s sensor. But “very expensive and important satellites should have shutters” to block this kind of threat, said Grego, who considers these types of activities more of a nuisance than a space attack.

Space drone: Moving further into the realm of science fiction, the US military has developed the first space drone, the X-37B. Bearing a striking resemblance to the space shuttle, the drone is officially a reusable spacecraft for carrying payloads into space…Its other missions are classified, but the drone’s maneuverability, payload space and ability to stay in orbit for hundreds of days have space watchers and countries like Russia and China wondering whether the X-37B would one day be used as a space fighter jet,

Excerpts from Jim Sciutto and Jennifer Rizzo War in space: Kamikazes, kidnapper satellites and lasers, CNN, Nov. 29, 2016

Laser Weapons

The notion of using energy as a weapon of war dates back at least as far as the ancient Greeks. In the late 1970s and early 1980s the idea was revived when American strategists began thinking in earnest about the technologies they would need to shoot down nuclear-armed ballistic missiles. Among the more fanciful ideas taken up by Ronald Reagan’s Strategic Defence Initiative (more commonly known as Star Wars) was the X-ray laser, which aimed to harness the energy of an atomic explosion to generate powerful laser beams….

The main appeal of using an energy beam to shoot things is that it travels at the speed of light, which means, in practice, that it will hit whatever it is aimed at. Trying to shoot down an incoming missile or warhead with a physical projectile, by contrast, is much more difficult. The guidance challenges of trying to “hit a bullet with a bullet” are enormous and are only gradually being solved using complex radars and missiles equipped with expensive sensors. A second attraction of lasers and other energy weapons is that in most cases they cannot run out of ammunition, and can keep firing for as long as they are plugged into a power source. The initial costs may be quite high, but each shot may then cost only a few dollars, compared with a price-tag of $3m or more for the latest missiles used to shoot down aircraft or other missiles.

Yet until very recently, despite the billions of dollars invested in them, military lasers have had a less than glowing record. The most famous (and expensive) experiment was America’s Airborne Laser Test Bed. This programme, which cost the Pentagon about $5 billion over more than 15 years, was an effort to cram a huge laser gun into a Boeing 747. It was intended to shoot down ballistic missiles in their “boost phase”, after their launch but before they had picked up enough speed to leave the atmosphere. The logic was that this is a particularly vulnerable time for a missile, since it is moving relatively slowly and because even minor damage to an accelerating rocket could prove fatal given the enormous stresses it is subjected to.

The airborne laser showed some promise in tests, but the programme was ignominiously zapped in 2011 by the Pentagon, which couldn’t quite work out how it would be able to keep a big, slow-moving jumbo jet airborne around the clock, deep within enemy territory, while waiting for a missile to blast off nearby.  Another laser that came close to being practical enough to use was the Tactical High Energy Laser, also known as the Nautilus laser which was designed to shoot down incoming artillery rounds. It was successfully tested in Israel, where it intercepted incoming rockets and shells, but Israel and America decided to pull the plug on it. One reason that it and the airborne laser were shot down was that military planners fell out of love with chemical lasers. These are very large and not especially portable lasers that are powered by a chemical reaction. As well as being bulky, they require large amounts of toxic and perishable chemicals, which can run out, limiting the number of shots that the laser can fire.

For the moment, the idea of shooting down big nuclear-tipped missiles with lasers has been put on hold, and proponents of laser weapons are aiming instead at more flammable targets. Much of the work in this field is now being done by the American navy….

The big trend now is to try to scale up three other sorts of laser that are far more compact than chemical lasers and can fire away merrily as long as they have power and don’t get too hot. The first sort is the fibre laser, in which the beam is generated within an optical fibre. Because this is already used in industry for welding and cutting, prices are falling, power output is increasing and reliability has been steadily improving. Industrial lasers can be turned into weapons pretty easily, simply by strapping them to a weapons mount.  But they are not very powerful. The Tactical Laser System being developed for the American navy by BAE Systems, a British firm, has an output of just 10kW, enough to run a few household kettles. Even so, it might be useful for frightening off (or burning holes in) small boats that look threatening but wouldn’t warrant a hail of machinegun fire. A slightly bigger version puts out about 33kW of power and fits neatly on existing turrets that house the rotary cannons used to shoot down incoming anti-ship missiles. It could blind optical or heat-seeking sensors on enemy missiles, or puncture small boats.  Plans are afoot to scale military fibre lasers up to about 100kW, which would enable them to shoot down small unmanned aircraft. The technology is relatively mature: a study by the Congressional Research Service (CRS), an American government-research body, (pdf) reckons it would cost around $150m to develop a prototype, and that such lasers could be in service by 2017.

The second technology being worked on is the slab laser… It would be less useful for shooting down targets flying directly at the laser because of “thermal blooming”….The Center for Strategic and Budgetary Assessments, a think-tank based in Washington, DC, argues that various sorts of solid-state lasers could be in service on American ships by 2018. It thinks that they could also be used to counter cruise missiles flying directly at a ship, using relay mirrors mounted on nearby unmanned aircraft.

To be really suitable for shooting down ballistic missiles, however, a laser with a power level of more than a megawatt would be needed. That would mean using a third technology, called a free-electron laser….

Although lasers have many advantages, in short, they also suffer from quite severe limitations. The main one is their relatively low power output. So much energy is needed to burn through the armour of a tank, for instance, that it is easier simply to fire a rocket at it. Even people do not make particularly good targets for lasers: human bodies can absorb a lot of energy before heating up substantially. (Eyes make a better target, but international conventions ban lasers designed to blind.)

A further limitation is that laser light can be absorbed or scattered by pollution, fog or smoke. Missiles or other targets can also be protected by coating them with mirrors or wrapping them with insulation. In addition, laser beams travel in a straight line, which means they are less useful than conventional artillery when shooting at something on the other side of a hill. It seems likely that laser weapons will have been deployed on ships by the end of the decade. They will have their uses, but they remain rather less fearsome than their science-fiction reputation might suggest.

Excerpts, Energy weapons: Zap, crackle and pop, Economist Technology Quarterely, Sept. 1, 2012, at 12