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By: - 26th August 2005 at 17:54 Permalink - Edited 1st January 1970 at 01:00
SPACE BASED RADAR TO KILL STEALTH
When stealth technology is used in modern military aircraft, usually only the forward sector of the aircraft is treated and/or shaped. This forward sector treatment is effective against static, ground based radars.However, the aircraft may be very susceptible to a look-down type of radar. This thesis addresses the viability of using space- based radar to detect stealth aircraft. Many papers have been written on how to use space-based radar to detect and track targets.
The approach of this thesis was to select a target area, in this case Iraq, and develop two satellite constellations that could provide the required radar coverage. The next step was to determine if the system would be able to detect and track stealth targets.
Based on the analysis, one satellite in geosynchronous orbit can detect stealth aircraft. However, because the satellite is 35,786 km away, the power requirements, as well as the spot size are too large to track stealth aircraft. On the other hand, a constellation of 32 satellites in low earth orbit (1000 km)[u] can both detect and track stealth aircraft[/u].
By: - 26th August 2005 at 17:55 Permalink - Edited 1st January 1970 at 01:00
Busting Stealth
Multi-billion pound stealth bombers could be rendered obsolete by a British invention that uses existing mobile telephone masts to detect and track aircraft that were previously invisible to radar.Stealth fighters and bombers such as the F117, B1 and B2 played key roles in the Gulf and Kosovan wars as they are almost impossible to detect using conventional radar. However, the ease with which the mobile telephone mast system developed at Roke Manor Research at Romsey in Hampshire can be used to detect the aircraft has greatly concerned the military.
Peter Lloyd, head of projects at the laboratory's sensor department, said: "I cannot comment in detail because it is a classified matter, but let's say the US military is very interested." Stealth aircraft, each of which costs at least £1.4 billion, are shaped to confuse radar. A special paint absorbs radio waves, reducing the radar signature to the equivalent of a gull in flight.
The Roke Manor scientists discovered that telephone calls sent between mobile phone masts detected the precise position of stealth aircraft with great ease.
Mr Lloyd said: "We use just the normal phone calls that are flying about in the ether. The front of the stealth plane cannot be detected by conventional radar, but its bottom surface reflects very well."
Mobile telephone calls bouncing between base stations produce a screen of radiation. When the aircraft fly through this screen they disrupt the phase pattern of the signals. The Roke Manor system uses receivers, shaped like television aerials, to detect distortions in the signals. A network of aerials large enough to cover a battlefield can be packed in a Land Rover.
Using a laptop connected to the receiver network, soldiers on the ground can calculate the position of stealth aircraft with an accuracy of 10 metres with the aid of the GPS satellite navigation system.
Mr Lloyd said: "It's remarkable that a stealth system that cost £60 billion to develop is beaten by £100,000 mobile phone technology. It's almost impossible to disable a mobile phone network without bombing an entire country, whereas radar installations are often knocked out of action with a single bomb or missile."
Mr Lloyd said the range of the mobile telephone base station system is classified information, but it would be at least the maximum distance a mobile phone would work from a base station - about 15 miles.
According to military sources, a rough version of a similar system might have been used in Serbia to shoot down an American F117 stealth fighter 40 miles west of Belgrade during the Kosovo campaign. The Serbs fired several missiles into an area they suspected the stealth fighter was flying through.
By: - 26th August 2005 at 17:56 Permalink - Edited 1st January 1970 at 01:00
Great read.
I also read the Aussie Jindalee radar picks up Stealth aircraft
By: - 26th August 2005 at 17:57 Permalink - Edited 1st January 1970 at 01:00
Low-frequency radars may be used to overcome "Stealth" technology
"Low-frequency radars, destined to become the base element of any detection system against LO aircraft and guided missiles, enjoy increasing confidence of military hardware developers, as computing capabilities of modern radars and sophistication of computing algorithms are rapidly growing and allow to identify even the smallest characteristics of aircraft designs using "Stealth" technology.A recently published article from Aviation Week & Space Technology, based on the interview with a US Navy pilot, who participated in the planning of strikes against Iraqi air defense during the early stages of the operation Desert Storm, indicates that there is "nothing invisible in the radar frequency range below 2GHz"and with a well-designed low-frequency radar it is possible to "see even a dragonfly at a great distance".
Soviet-built low-frequency "Bar Lock" and "Spoonrest" radars were used for detecting targets at great distances. These radars operated in the UHF and L-band frequency ranges when it was possible to make use the half-wave resonance effect. This effect can be observed when the length of an aircraft or a cruise missile roughly corresponds to the half of the wavelength, thus creating phase-coherent reflections from the terminal points of the target. Dipole reflector, developed during the Second World War, used this effect to jam radars of that era. Metallic film, cut into strips of the length corresponding to half of the wavelength, resonate with the incoming radar signal, creating an illusion of a large target. Using the resonance effect it is relatively easy to detect even the most advanced LO aircraft, cruise missiles and ballistic missiles.
By: - 26th August 2005 at 17:58 Permalink - Edited 1st January 1970 at 01:00
[b]China can detect stealth : US int.
The Izvestia (Taras Lariokhin, "BEIJING LEARNED HOW TO SEE THE 'INVISIBLE' ONES", Moscow, Pg.7) reported that high-ranking officials of the US Defense Department and industry experts will convene in Washington this December to discuss the implications of alleged PRC capability of detecting the US F-117 Stealth aircraft.The US intelligence claims that the new technology may be introduced to the PRC air defenses within two years. Unlike the existing radars, the new radar systems operate by detecting the temporary noises caused by a passing Stealth aircraft. The radar will not need to emit electromagnetic waves and therefore cannot be easily detected or subsequently destroyed.
The US company Lockheed Martin, which invented the Stealth technology, has also produced a similar device called the "Silent Sentinel," but has not introduced it into practice.
By: - 26th August 2005 at 17:59 Permalink - Edited 1st January 1970 at 01:00
INDIAN DEVELOPMENTS
[b]
Scientists of the Bangalore-based Indian Institute of Science (IISc) are developing the next generation radars.
These high-precision radars would also be able to detect rain drops, hails or ice flakes at a large distance with high accuracy for meteorological studies, he said, adding "A single drop of rain having a diameter of one millimeter at a distance of 100 km can be traced by these radars."
The only bottleneck is that the radars require very high computing facility for practical use. "With our supercomputer, which is faster than US Cray supercomputer, it takes about nine hours to analyze the data," Balakrishnan disclosed.
A new mode of computing is therefore necessary to accelerate the practical use, he said. Probably quantum computing, which is still in the laboratory stage and is believed to be the future of computing, would be the right technique for such radars.
The team is also working on an advanced version of the radar which can make the so-called "invisible aircraft" visible. Normal radars fail to see the type of aircraft, regularly used by advanced countries for surveillance, as they are coated with a paint which makes them invisible to the radar.
But in their movement they produce waves which, at least theoretically, can be detected just as the movement of a ship can be traced by observing the waves it creates. "We are trying to develop computational algorithm for this purpose," Balakrishnan said.
From News India - Times. Jan 14, 2000
This is old news and i suppose this would have alredy been developed by now.
By: - 26th August 2005 at 18:01 Permalink - Edited 1st January 1970 at 01:00
FROM A BRITISH COMPANIE's WEBSITE
Stealth engineers at Roke Manor Research design both stealth and covert antennas, as well as developing applications that analyse the radar signature of stealth antennas and platforms that host stealth antennas.We use our world renowned Epsilon™ for radar signature analysis and design hybrid solutions using Epsilon™ in conjunction with other rigorous solvers.
Epsilon™ is a comprehensive radar signature assessment and diagnostics tool, used to address land, sea and air platforms.
Since 1986 we have provided our customers in this field with the solutions that they need to be world leaders. We take design concepts, on paper or CAD format, to analyse the radar signatures. Epsilon™ has an international reputation and is probably the most widely used radar cross-section prediction code.
Much of the work is computational electro-magnetic based and has applications in both civil and defence sectors for electro-magnetic compatibility and radiation hazard assessment.
We have also developed Victory™, in conjunction with DERA, software to exploit computational physics skills and computational electro-magnetics in physical level simulations.
Roke Manor Research's stealth engineering group's experience means that it has become increasingly involved in counter-stealth projects. We are currently involved in the development of next generation radar systems to counter sophisticated stealth technology.
We are working on systems that are increasing our expertise in ultra wideband systems. Areas of application for this technology are in impulse radar and future generation communications systems. In particular, the group has developed signal sources and antennas covering the 1-40 GHz band
http://www.roke.co.uk/defence/stealth.asp
The same company has also developed the Hawk-Eye system for cricket telecasts. Being an ardent cricket fan i can assure one and all the system is great and works very well.
The Hawk-Eye system : http://www.roke.co.uk/sensors/imaging/tracking_prediction.asp
By: - 26th August 2005 at 18:03 Permalink - Edited 1st January 1970 at 01:00
More from the UK...
A British research and development company, which claims to have invented a method to detect stealth aircraft, has clammed up on details about its technology.
Roke Manor Research has decided not to speak to the press after UK national the Daily Telegraph ran an article on the detection system. Roke claims the Telegraph misquoted the company's head of projects. [The truth or arse covering? - you decide, Ed]
The system uses a traditional mobile phone network to detect stealth aircraft as they pass silently through the ether. Although the aircraft have advanced coatings which absorb conventional radar signals, they apparently still reflect back enough radiation emitted from mobile phone masts to be detected by special ground receivers.
The receivers are linked to a central computer which - in sync with a GPS satellite - is able to position the aircraft to within 10 metres.
The central computer could conceivably be a simple notebook operated by ground troops. Once exposed, the stealth aircraft would be easy prey for convential ground-to-air missiles.
Disabling the system would require the complete destuction of a target country's mobile phone mast network - in reality, an impossible task.
Considering the potential of this system to completely undermine the US's stealth aircraft programme, it might be reasonable to assume that the military there is taking a close interest. Not so, according to Roke Manor Research, despite claims by the Daily Telegraph.
According to the Telegraph Peter Lloyd, head of projects at the laboratory's sensor department, said: "I cannot comment in detail because it is a classified matter, but let's say the US military is very interested."
Lloyd today denied ever having said that the project was classified, or that the US military has expressed an interest. He added that the article was a "gross distortion of the truth", and that he was under instructions not to talk to the press. Details on the project have been removed from Roke Manor Research's website.
Despite the company's assertions, it is indeed unlikely that the US military has not taken a degree of 'interest' in this project. After all, the US is the only country currently actively deploying stealth aircraft - the F-117 and B-2. It also has the F-22 'Raptor' in development.
The Telegraph article claims that, according to 'military sources', the Serbs may have used a crude version of the same technology to shoot down an F-117 during the Kosovo crisis.
If this is true, then the US will be keeping a very close eye on an ingenious idea which could, at a stroke, render its multi-billion dollar stealth programme obsolete. ®
Bootnote
Another Roke Manor Research product recently made the news. The company's 'Hawk-Eye' system has been tested in a cricket match between England and Pakistan.
The technology is able to accurately track the path of the ball from bowler to batsman in three dimensions. It is hoped that this will eventually lead to the umpires being able to call upon an impartial technological 'third umpire' to resolve borderline lbw decisions.
Perhaps the company might like also to consider a device which can detect meetings between cricketers and bent bookies - now that would be a breakthrough.
http://www.theregister.co.uk/2001/06/20/stealth_detection_system_disappears/
By: - 26th August 2005 at 18:06 Permalink - Edited 1st January 1970 at 01:00
MIT website says :
A big part of the radar visibility problem is that stealth technology was designed to hide planes from high frequency radar commonly used by the former Soviet Union, but stealth planes are readily spotted by low-frequency radar systems. Older radar technology was based on low-frequency and new radar systems include a broad range of both low and high frequency radar. These radar systems are buildable with off-the-shelf parts by virtually any engineering student.In other words, stealth technology is already obsolete.
(this is from an article dated November, 2000)
If this is not the time to reduce military spending on ineffective technologies, then it seems that time will never come.
http://web.mit.edu/thistle/www/v12/2/stealth.html
-------------------------------------------------------
WIKIPEDIA says :
A number of methodologies to detect stealth aircraft at long range have been developed. Both Australia and Russia have announced that they have developed processing techniques that allow them to detect the turbulence of aircraft at reasonably long ranges (possibly negating the stealth technology). The UK has announced a system that uses the signals broadcast from the huge number of cellular telephone towers to generate a synthetic picture, although it is not clear if this method is actually practical. A general feature of these systems is that they use a large number of low-accuracy radar systems (or signal sources) combined with heavy computer processing to generate tracking information.
----------------------------------------
US govt sponsored website says :
Stealth teaches the lesson that technology is never static - a "stealth breakthrough" may only last for a few years before an adversary finds a means of countering it.
Low-frequency radar will spot virtually any stealthy aircraft but is bad at determining its exact location. Communications networks enabling a defensive system to combine information and locate a target also connect these and other radars. Other systems attempt to pick up radio and television signals that may bounce off a stealthy airplane.
http://www.centennialofflight.gov/essay/Evolution_of_Technology/Stealth_tech/Tech18.htm
By: - 26th August 2005 at 18:07 Permalink - Edited 1st January 1970 at 01:00
Found it,
Stealth Aircraft not Immune
Edinburg is also linked to a third Jindalee transmitter and receiver at Alice Springs, which has operated as a JORN test site since 1993. McElroy says the Jindalee radar is very difficult to jam because of the way the signal is propagated over the ionosphere. "It can also detect stealth bombers, which are not designed to defeat the characteristics of Jindalee's high frequency radar," he said.
Stealth aircraft, such as the US Nighthawk F117A, are designed with sharp leading edges and a flat belly to minimise reflections back towards conventional ground-based radars. However, Jindalee radar bounces down from the ionosphere onto upper surfaces that include radar-reflecting protrusions for a cockpit, engine housings and other equipment.
Group Captain Hockings says stealth aircraft are coated with special radar absorbing material to avoid detection by conventional microwave radar. But the Jindalee radar uses high frequency radio waves, which have a much longer frequency than microwave radar. "Unless designed to be stealthy to both microwave and HF radars, (stealth) aircraft would not evade detection by JORN," he said.
The RAAF admits the system can operate well beyond its "unclassified" range of 3000 kilometres when radar signals become trapped inside the ionosphere and bounce twice before emerging over the horizon. However, unofficial reports that JORN can see as far as Singapore Harbour, Hong Kong and the Russian border are described by the RAAF as "highly optimistic".
More than a million lines of software code were written to integrate the constantly changing electronic data in what is described by RLM Systems as the biggest software development project in the southern hemisphere. The whole network is linked to a test command centre in Melbourne and, via a duplicate link, to the RAAF's high frequency surveillance command headquarters at Edinburg base, near Adelaide.
By: - 26th August 2005 at 18:08 Permalink - Edited 1st January 1970 at 01:00
PROOF THAT IT WORKS
American F-117A stealth bomber shot down over Yugoslavia in March of 1999.
Pentagon officials confirmed that the aircraft was tracked by an unidentified radar and that two surface-to-air missile were fired at the F-117.
By: - 26th August 2005 at 18:09 Permalink - Edited 1st January 1970 at 01:00
Sensors to locate targets pose a particular problem for stealth aircraft. The large radars used by conventional aircraft would obviously compromise the position of a stealth aircraft. Air-to-air combat would rely on passive detection of transmissions by hostile aircraft, as well as infrared tracking.Aircraft for attacking targets on the ground face a similar problem. FLIR can be used for precise aiming at targets whose general location is known, but they are poorly suited for searching for targets over a wide area. A radar on the aircraft to scan for potential targets would compromise its position. In order to locate targets, stealth aircraft may rely on an airborne laser radar, although such a sensor may prove of limited utility in poor weather.
There are limits to the utility of stealth techniques. Since the radar cross-section of an aircraft depends on the angle from which it is viewed, an aircraft will typically have a much smaller RCS when viewed from the front or rear than when viewed from the side or from above. In general stealth aircraft are designed to minimize their frontal RCS. But it is not possible to contour the surface of an aircraft to reduce the RCS equally in all directions, and reductions in the frontal RCS may lead to a larger RCS from above. Thus while a stealth aircraft may be difficult to track when it is flying toward a ground-based radar or another aircraft at the same altitude, a high-altitude airborne radar or a space-based radar may have an easier time tracking it.
Another limitation of stealth aircraft is their vulnerability to detection by bi-static radars. The contouring of a stealth aircraft is designed to avoid reflecting a radar signal directly back in the direction of the radar transmitter. But the transmitter and receiver of a bi-static radar are in separate locations indeed, a single transmitter may be used by radar receivers scattered over a wide area. This greatly increases the odds that at least one of these receivers will pickup a reflected signal. The prospects for detection of stealth aircraft by bi-static radar are further improved if the radar transmitter is space-based, and thus viewing the aircraft from above, the direction of its largest radar cross section.
Several analysts claim stealth aircraft will be vulnerable to detection by infrared search and track systems (IRST). The natural heating of an aircraft's surface makes it visible to this type of system. The faster and aircraft flies, the warmer it gets, and thus, the easier to detect through infrared means. One expert asserts "if an aircraft deviates from its surroundings by only one degree centigrade, you will be able to detect it at militarily useful ranges." In fact, both the Russian MiG-29 and Su-27 carry IRST devices, which indicates that the Russians have long targeted this as a potential stealth weakness.
Stealth aircraft are even more vulnerable to multiple sensors used in tandem. By using an IRST to track the target and a Ladar (laser radar), or a narrow beam, high-power radar to paint the target superior data is provided.
The most basic potential limitation of stealth, is its vulnerability to visual detection. Since the F-22 is 25-30 percent larger than the F-15 and 40 percent larger than the F-18, for example, it will be much easier to detect visually from ranges on the order of 10 miles. When one considers that stealth characteristics will drastically reduce the effectiveness of several types of guided air-to-air missiles, fighter engagements will probably move back to the visual range arena. In this context, the cumbersome F-22 would be at a distinct disadvantage.
excrepts from http://www.engineering.com/content/ContentDisplay?contentId=41010021
By: - 26th August 2005 at 18:10 Permalink - Edited 1st January 1970 at 01:00
Another good link : http://www.fas.org/nuke/control/mtcr/text/mtcr_handbook_item17.pdf
And check this out :
When the F-117 opens its weapons bays, it automatically increases its radar signature. The bays are open only for a short time, but it's long enough for enemy radar to get a lock on the fighter's position and allow the enemy to take countermeasures.The moment the F-117 opens its weapons-bay doors is the modern-day equivalent of the flaming datum. Once seen, how-ever briefly, the F-117's presence has been announced. Air defenses, knowing the F-117's speed limitations, can quickly mount a counterstrategy that, given modern weapons systems, can find it and destroy it
By: - 26th August 2005 at 18:12 Permalink - Edited 1st January 1970 at 01:00
[u]US buying these to test 'em out[/u]
The one country that surely doesn't need to find out where Stealth bombers might be is buying a radar system that is claimed to be able to detect them.The USA is reported to be negotiating to buy a set of Vera radars from the Czechs, the quid pro quo being that a deal to sell them to China does not go ahead.
Vera is the successor to the Tamara radar system, which has been alleged to have been responsible for the loss of an F-117 in Kosovo.
The rationale behind the current proposed US purchase is that the US wants to test the radar's effectiveness.
full article at .. http://www.theregister.co.uk/2004/05/20/us_buys_vera_stealth/
By: - 26th August 2005 at 18:14 Permalink - Edited 1st January 1970 at 01:00
Information about Tamara anti-stealth radar
By: - 26th August 2005 at 19:24 Permalink - Edited 1st January 1970 at 01:00
No triangulation of cellphone network of electronics emmeting tamara would be efficient into an extrem jamming war zone! cell phone network isn't very new!
actually the most advanced inopherique radar is Nostradamus, because he detect the movement of any plane "stealth or no is the same for him" from the echo of low frequency that the plane energy is emiting to the ionopheric layer!
"Basé à Dreux sur une ancienne base de l'OTAN, Nostradamus se compose d'un réseau de 300 antennes de 7 mètres de haut ayant la forme d'une immense croix à trois branches. Un tiers d'entre elles sont émettrices de signaux, toutes sont réceptives. Sa porté permet d'obtenir des renseignements sur l'activité aérienne et navale des régions d'Europe, de l'Afrique du nord et du Moyen-Orient. D'autres pays comme l'Australie et les États-Unis avaient déjà mis au point de tels radars mais sans jamais avoir atteint un niveau de performance aussi élevé. Les antennes radar devaient se déplacer pour effectuer la visée, la partie émettrice et la partie réceptive du radar devaient être localisées à plusieurs centaines de kilomètres l'une de l'autre. L'angle de visée ne dépassait pas 60 degrés. Tout ceci n'était pas probant. Mais Nostradamus, par ses résultats étonnants 360 degrés, ce type de radar et trouvera probablement sa place dans l'éventail des systèmes de surveillance"
By: - 3rd October 2005 at 17:08 Permalink - Edited 1st January 1970 at 01:00
K this was a fine thread .... let me post one more abt the same from the Indian side, which appeared a few years ago ...
Scientists create device to see invisible aircraftFrom Kalyan Ray
DH News Service
NEW DELHI, July 28Uniquely coating two glass slides with some chemicals, Indian scientists have come up with a memory storage device, which is capable of seeing "invisible" aircraft used in warfare and can be used in the heart of future target tracking devices.
After four years of diligent research, a team at National Physical Laboratory (NPL), here under the Council of Scientific and Industrial Research (CSIR) have been able to develop the memory storage device which is superior to existing storage devices as it can store images up to one year. The NPL team got patents on the novel system in US, Japan, Germany, UK and South Korea.
Using the NPL device, Instrumentation Research and Development Establishment (IRDE) a Defence Research and Development Organisation (DRDO) laboratory at Dehradun, is working to create an improved target-tracking equipment since the indigenous system is capable of seeing the invisible.
Many nations today use aircraft coated with a radar absorbing paint that make such planes invisible to the radar. "But our device converts invisible images into visible images making these planes visible.
It can see throughout the spectrum — from ultraviolet to visible to infrared range — which is an added advantage," NPL team leader Dr Ashok Biradar told Deccan Herald. The system identifies the planes within a fraction of a second.
On the civilian side, the device can be used for storing holographic images, Dr Biradar said, adding that the commercial potential of the application had not been explored so far. The device runs on one pencil battery and cheaper than semiconductor-based storage devices used in computers.To prepare the storage device, two-glass plates were coated with a chemical called indium tin oxide. On the coated glass plate, a second coating by a polymer was given. A spacer is used to maintain a tiny gap between the two plates.
But what makes the entire system unique, is a grooving which the scientists were able to create on the polymer surface by controlling the polymer formation and manually rubbing the material.“The uneven grooves and the thickness of the coating are the two vital components of the storage device. A slightly thicker coating than what is normally used leads to the memory effect while the grooves hold the images that can be seen on a display,” he explained.
For image conversion the optical storage system needs to be integrated with a chemical known as ferroelectric liquid crystal. The problem area is lack of repeatability as the team has failed in repeating the particular pattern on the polymer by manually rubbing the surface in 90 per cent cases. But NPL is importing a machine that scientists feel will do away with the uncertainty by mechanically rubbing the surface in an orderly fashion.
but I think, the patenting was a BIG mistake ....
By: - 4th October 2005 at 13:53 Permalink - Edited 1st January 1970 at 01:00
All of this is old news. The F-117 wasn't shot down with some
special anti stealth device, it was shot down with an old Sa2, and
a normal, cold war radar. the F-117 was flying the same path,
every time, at low altitude. Not being stupid, the Serbs put a
missle launcher and radar nearby, and easily shot it down. Close
up, anything is visible to radar.
All these anti stea;th systems, space based radar, cellphone
networks, are inconsequential. They will work for any aircraft.
Radar works on stealth aircraft - it just works less effectivly.
That's it. There's no big secret, stealth aircraft are just hardER to
spot with IR or radar. They FORCE the enemy to try other
means. Regardless of them, all will be less effective on stealth
planes than conventional ones, except maybe turbulence
detectors.
As far as cellphone towers... Destroying all the nations cellphone
towers in not impossible by a long shot. All we'd need is th eGPS
locations of the towers that would need to be destroyed, and then
we could program them into SDB's. A flight of 4 B2's would
carry enough SDB's to destroy over 700 targets at a range of
over 40 miles.
It's a non-static field. Methods will come about to detect stealth,
but your incorrect to say it's obsolete. Just because Sa2's were
able to bring down B-52's doesn't mean they were obsolete in the
60's. I'd rather be in a stealth aircraft than a non-stealth aircraft, if
I had to fly into sensor rich enemy territory.
By: - 4th October 2005 at 14:27 Permalink - Edited 1st January 1970 at 01:00
As far as cellphone towers... Destroying all the nations cellphone
towers in not impossible by a long shot. All we'd need is th eGPS
locations of the towers that would need to be destroyed, and then
we could program them into SDB's. A flight of 4 B2's would
carry enough SDB's to destroy over 700 targets at a range of
over 40 miles.
But those cell towers are powered off the AC power grid which is often the first victim of a air offensive. Cell towers have power conditioning and UPS voltage hold-ups for transient glitches on the AC power grid, but once AC goes away, so does the cell capability.
By: - 4th October 2005 at 23:16 Permalink - Edited 1st January 1970 at 01:00
Hi Blackcat,
Anymore links to this article as well as this subject. Seems like a image storage system than some sort of detection system, is it meant to be linked to a detection system?
Thanks
K this was a fine thread .... let me post one more abt the same from the Indian side, which appeared a few years ago ...but I think, the patenting was a BIG mistake ....
Posts: 815
By: Stealth Spy - 26th August 2005 at 17:53
Here are a some details on Stealth Detection :
New "Passive" Radar, under Development by Russia, Could Threaten Stealth Aircraft
1) Mobile phone masts normally are honeycombed across large areas, transmitting and receiving signals to provide a continuous service for users. They, and radio and television transmitters, produce a screen of radiation that can be distorted by moving aircraft.
2) Special receivers, scattered over an area, are used to receive radio frequency waves already in the atmosphere.
3) The receivers are linked to a high-performance computer that can process all the signal data and provide a graphical depiction of the aircraft location.
4) A global positioning satellite might be used to help pinpoint the location of the aircraft for targeting.
5) A US F-117 stealth aircraft is shaped so it is difficult to detect when traditional radar signals strike it head on. With the passive system, signals are transmitted from many fixed points near the ground. It's asserted they might bounce off the aircraft's fairly flat underbelly, making the plane easier to detect.
Of immediate concern is that this so-called passive radar can also track all types of aircraft without the pilots knowing they are being watched or targeted. With conventional radar, pilots know when they are being tracked and can take appropriate action. Conventional radar sends out its own high-frequency signal that a pilot can detect. The new radar simply listens to low-frequency radio waves that are already in the atmosphere in great profusion, from power sources such as transmitters used for television, FM radio and cell phones.
"And because there are quite a large number of transmitters that they can use for that purpose, it's quite effective," says Professor Hugh Griffiths of University College London.
[/quote]