Wednesday, 7 December 2011

Bermuda Triangle

The area of the Triangle varies by author

The boundaries of the triangle cover the Straits of Florida, the Bahamas and the entire Caribbean island area and the Atlantic east to the Azores. The more familiar triangular boundary in most written works has as its points somewhere on the Atlantic coast of Miami; San Juan, Puerto Rico; and the mid-Atlantic island of Bermuda, with most of the accidents concentrated along the southern boundary around the Bahamas and the Florida Straits.
The area is one of the most heavily traveled shipping lanes in the world, with ships crossing through it daily for ports in the Americas, Europe, and the Caribbean Islands. Cruise ships are also plentiful, and pleasure craft regularly go back and forth between Florida and the islands. It is also a heavily flown route for commercial and private aircraft heading towards Florida, the Caribbean, and South America from points north.

History

Origins

The earliest allegation of unusual disappearances in the Bermuda area appeared in a September 16, 1950 Associated Press article by Edward Van Winkle Jones.[5] Two years later, Fate magazine published "Sea Mystery at Our Back Door",[6] a short article by George X. Sand covering the loss of several planes and ships, including the loss of Flight 19, a group of five U.S. Navy TBM Avenger bombers on a training mission. Sand's article was the first to lay out the now-familiar triangular area where the losses took place. Flight 19 alone would be covered in the April 1962 issue of American Legion Magazine.[7] It was claimed that the flight leader had been heard saying "We are entering white water, nothing seems right. We don't know where we are, the water is green, no white." It was also claimed that officials at the Navy board of inquiry stated that the planes "flew off to Mars." Sand's article was the first to suggest a supernatural element to the Flight 19 incident. In the February 1964 issue of Argosy, Vincent Gaddis's article "The Deadly Bermuda Triangle" argued that Flight 19 and other disappearances were part of a pattern of strange events in the region.[8] The next year, Gaddis expanded this article into a book, Invisible Horizons.[9]
Others would follow with their own works, elaborating on Gaddis's ideas: John Wallace Spencer (Limbo of the Lost, 1969, repr. 1973);[10] Charles Berlitz (The Bermuda Triangle, 1974);[11] Richard Winer (The Devil's Triangle, 1974),[12] and many others, all keeping to some of the same supernatural elements outlined by Eckert.[13]

Larry Kusche

Lawrence David Kusche, a research librarian from Arizona State University and author of The Bermuda Triangle Mystery: Solved (1975)[14] argued that many claims of Gaddis and subsequent writers were often exaggerated, dubious or unverifiable. Kusche's research revealed a number of inaccuracies and inconsistencies between Berlitz's accounts and statements from eyewitnesses, participants, and others involved in the initial incidents. Kusche noted cases where pertinent information went unreported, such as the disappearance of round-the-world yachtsman Donald Crowhurst, which Berlitz had presented as a mystery, despite clear evidence to the contrary. Another example was the ore-carrier recounted by Berlitz as lost without trace three days out of an Atlantic port when it had been lost three days out of a port with the same name in the Pacific Ocean. Kusche also argued that a large percentage of the incidents that sparked allegations of the Triangle's mysterious influence actually occurred well outside it. Often his research was simple: he would review period newspapers of the dates of reported incidents and find reports on possibly relevant events like unusual weather, that were never mentioned in the disappearance stories.
Kusche concluded that:
  • The number of ships and aircraft reported missing in the area was not significantly greater, proportionally speaking, than in any other part of the ocean.
  • In an area frequented by tropical storms, the number of disappearances that did occur were, for the most part, neither disproportionate, unlikely, nor mysterious; furthermore, Berlitz and other writers would often fail to mention such storms.
  • The numbers themselves had been exaggerated by sloppy research. A boat's disappearance, for example, would be reported, but its eventual (if belated) return to port may not have been.
  • Some disappearances had, in fact, never happened. One plane crash was said to have taken place in 1937 off Daytona Beach, Florida, in front of hundreds of witnesses; a check of the local papers revealed nothing.
  • The legend of the Bermuda Triangle is a manufactured mystery, perpetuated by writers who either purposely or unknowingly made use of misconceptions, faulty reasoning, and sensationalism.[14]

Further responses

When the UK Channel 4 television program "The Bermuda Triangle" (c. 1992) was being produced by John Simmons of Geofilms for the Equinox series, the marine insurance market Lloyd's of London was asked if an unusually large number of ships had sunk in the Bermuda Triangle area. Lloyd's of London determined that large numbers of ships had not sunk there.[15]
United States Coast Guard records confirm their conclusion. In fact, the number of supposed disappearances is relatively insignificant considering the number of ships and aircraft that pass through on a regular basis.[14]
The Coast Guard is also officially skeptical of the Triangle, noting that they collect and publish, through their inquiries, much documentation contradicting many of the incidents written about by the Triangle authors. In one such incident involving the 1972 explosion and sinking of the tanker SS V. A. Fogg, the Coast Guard photographed the wreck and recovered several bodies,[16] in contrast with one Triangle author's claim that all the bodies had vanished, with the exception of the captain, who was found sitting in his cabin at his desk, clutching a coffee cup.[10] In addition, V. A. Fogg sank off the coast of Texas, nowhere near the commonly-accepted boundaries of the Triangle.
The NOVA/Horizon episode The Case of the Bermuda Triangle, aired on June 27, 1976, was highly critical, stating that "When we've gone back to the original sources or the people involved, the mystery evaporates. Science does not have to answer questions about the Triangle because those questions are not valid in the first place... Ships and planes behave in the Triangle the same way they behave everywhere else in the world."[17]
David Kusche pointed out a common problem with many of the Bermuda Triangle stories and theories: "Say I claim that a parrot has been kidnapped to teach aliens human language and I challenge you to prove that is not true. You can even use Einstein's Theory of Relativity if you like. There is simply no way to prove such a claim untrue. The burden of proof should be on the people who make these statements, to show where they got their information from, to see if their conclusions and interpretations are valid, and if they have left anything out."[17]
Skeptical researchers, such as Ernest Taves[18] and Barry Singer,[19] have noted how mysteries and the paranormal are very popular and profitable. This has led to the production of vast amounts of material on topics such as the Bermuda Triangle. They were able to show that some of the pro-paranormal material is often misleading or inaccurate, but its producers continue to market it. Accordingly, they have claimed that the market is biased in favor of books, TV specials, and other media that support the Triangle mystery, and against well-researched material if it espouses a skeptical viewpoint.
Finally, if the Triangle is assumed to cross land, such as parts of Puerto Rico, the Bahamas, or Bermuda itself, there is no evidence for the disappearance of any land-based vehicles or persons.[citation needed] The city of Freeport, located inside the Triangle, operates a major shipyard and an airport that handles 50,000 flights annually and is visited by over a million tourists a year.[20]

Supernatural explanations

Triangle writers have used a number of supernatural concepts to explain the events. One explanation pins the blame on leftover technology from the mythical lost continent of Atlantis. Sometimes connected to the Atlantis story is the submerged rock formation known as the Bimini Road off the island of Bimini in the Bahamas, which is in the Triangle by some definitions. Followers of the purported psychic Edgar Cayce take his prediction that evidence of Atlantis would be found in 1968 as referring to the discovery of the Bimini Road. Believers describe the formation as a road, wall, or other structure, though geologists consider it to be of natural origin.[21]
Other writers attribute the events to UFOs.[22] This idea was used by Steven Spielberg for his science fiction film Close Encounters of the Third Kind, which features the lost Flight 19 aircrews as alien abductees.
Charles Berlitz, author of various books on anomalous phenomena, lists several theories attributing the losses in the Triangle to anomalous or unexplained forces.[11]

Natural explanations

Compass variations

Compass problems are one of the cited phrases in many Triangle incidents. While some have theorized that unusual local magnetic anomalies may exist in the area,[23] such anomalies have not been shown to exist. Compasses have natural magnetic variations in relation to the magnetic poles, a fact which navigators have known for centuries. Magnetic (compass) north and geographic (true) north are only exactly the same for a small number of places – for example, as of 2000 in the United States only those places on a line running from Wisconsin to the Gulf of Mexico.[24] But the public may not be as informed, and think there is something mysterious about a compass "changing" across an area as large as the Triangle, which it naturally will.[14]

Deliberate acts of destruction

Deliberate acts of destruction can fall into two categories: acts of war, and acts of piracy. Records in enemy files have been checked for numerous losses. While many sinkings have been attributed to surface raiders or submarines during the World Wars and documented in various command log books, many others suspected as falling in that category have not been proven. It is suspected that the loss of USS Cyclops (AC-4) in 1918, as well as her sister ships USS Proteus (AC-9) and USS Nereus (AC-10) in World War II, were attributed to submarines, but no such link has been found in the German records.[citation needed]
Piracy—the illegal capture of a craft on the high seas—continues to this day. While piracy for cargo theft is more common in the western Pacific and Indian oceans, drug smugglers do steal pleasure boats for smuggling operations, and may have been involved in crew and yacht disappearances in the Caribbean. Piracy in the Caribbean was common from about 1560 to the 1760s, and famous pirates included Edward Teach (Blackbeard) and Jean Lafitte.[citation needed]
False-color image of the Gulf Stream flowing north through the western Atlantic Ocean. (NASA)

Gulf Stream

The Gulf Stream is a deep ocean current that originates in the Gulf of Mexico and then flows through the Straits of Florida into the North Atlantic. In essence, it is a river within an ocean, and, like a river, it can and does carry floating objects. It has a surface velocity of up to about 2.5 metres per second (5.6 mi/h).[25] A small plane making a water landing or a boat having engine trouble can be carried away from its reported position by the current.

Human error

One of the most cited explanations in official inquiries as to the loss of any aircraft or vessel is human error.[26] Whether deliberate or accidental, humans have been known to make mistakes resulting in catastrophe, and losses within the Bermuda Triangle are no exception. For example, the Coast Guard cited a lack of proper training for the cleaning of volatile benzene residue as a reason for the loss of the tanker V.A. Fogg in 1972[citation needed]. Human stubbornness may have caused businessman Harvey Conover to lose his sailing yacht, the Revonoc, as he sailed into the teeth of a storm south of Florida on January 1, 1958.[27]

Hurricanes

Hurricanes are powerful storms, which form in tropical waters and have historically cost thousands of lives lost and caused billions of dollars in damage. The sinking of Francisco de Bobadilla's Spanish fleet in 1502 was the first recorded instance of a destructive hurricane. These storms have in the past caused a number of incidents related to the Triangle.

Methane hydrates

Worldwide distribution of confirmed or inferred offshore gas hydrate-bearing sediments, 1996.
Source:
USGS
An explanation for some of the disappearances has focused on the presence of large fields of methane hydrates (a form of natural gas) on the continental shelves.[28] Laboratory experiments carried out in Australia have proven that bubbles can, indeed, sink a scale model ship by decreasing the density of the water;[29] any wreckage consequently rising to the surface would be rapidly dispersed by the Gulf Stream. It has been hypothesized that periodic methane eruptions (sometimes called "mud volcanoes") may produce regions of frothy water that are no longer capable of providing adequate buoyancy for ships. If this were the case, such an area forming around a ship could cause it to sink very rapidly and without warning.
Publications by the USGS describe large stores of undersea hydrates worldwide, including the Blake Ridge area, off the southeastern United States coast.[30] However, according to another of their papers, no large releases of gas hydrates are believed to have occurred in the Bermuda Triangle for the past 15,000 years.[15]

Rogue waves

In various oceans around the world, rogue waves have caused ships to sink[31] and oil platforms to topple.[32] These waves, until 1995, were considered to be a mystery and/or a myth.[33][34]

Notable incidents

Theodosia Burr Alston

Theodosia Burr Alston was the daughter of former United States Vice President Aaron Burr. Her disappearance has been cited at least once in relation to the Triangle.[35] She was a passenger on board Patriot, which sailed from Charleston, South Carolina to New York City on December 30, 1812, and was never heard from again. The planned route is well outside all but the most extended versions of the Bermuda Triangle. Both piracy and the War of 1812 have been posited as explanations, as well as a theory placing her in Texas, well outside the Triangle.
Schooner Carroll A. Deering, as seen from the Cape Lookout lightvessel on January 29, 1921, two days before she was found deserted in North Carolina. (US Coast Guard)

Ellen Austin

The Ellen Austin supposedly came across a derelict ship, placed on board a prize crew, and attempted to sail with it to New York in 1881. According to the stories, the derelict disappeared; others elaborating further that the derelict reappeared minus the prize crew, then disappeared again with a second prize crew on board. A check from Lloyd's of London records proved the existence of the Meta, built in 1854 and that in 1880 the Meta was renamed Ellen Austin. There are no casualty listings for this vessel, or any vessel at that time, that would suggest a large number of missing men were placed on board a derelict that later disappeared.[36]

USS Cyclops

The incident resulting in the single largest loss of life in the history of the US Navy not related to combat occurred when USS Cyclops, under the command of Lt Cdr G.W. Worley, went missing without a trace with a crew of 309 sometime after March 4, 1918, after departing the island of Barbados. Although there is no strong evidence for any single theory, many independent theories exist, some blaming storms, some capsizing, and some suggesting that wartime enemy activity was to blame for the loss.[37][38]

Carroll A. Deering

A five-masted schooner built in 1919, the Carroll A. Deering was found hard aground and abandoned at Diamond Shoals, near Cape Hatteras, North Carolina on January 31, 1921. Rumors and more at the time indicated the Deering was a victim of piracy, possibly connected with the illegal rum-running trade during Prohibition, and possibly involving another ship, SS Hewitt, which disappeared at roughly the same time. Just hours later, an unknown steamer sailed near the lightship along the track of the Deering, and ignored all signals from the lightship. It is speculated that Hewitt may have been this mystery ship, and possibly involved in the Deering crew's disappearance.[39]

Flight 19

US Navy TBF Grumman Avenger flight, similar to Flight 19. This photo had been used by various Triangle authors to illustrate Flight 19 itself.
Flight 19 was a training flight of TBM Avenger bombers that went missing on December 5, 1945, while over the Atlantic. The squadron's flight path was scheduled to take them due east for 120 miles, north for 73 miles, and then back over a final 120-mile leg that would return them to the naval base, but they never returned.
A search and rescue Mariner aircraft with a 13-man crew was dispatched to aid the missing squadron, but the Mariner itself was never heard from again. Later, there was a report from a tanker cruising off the coast of Florida of a visible explosion[40] at about the time the Mariner would have been on patrol.
While the basic facts of this version of the story are essentially accurate, some important details are missing. The weather was becoming stormy by the end of the incident, and naval reports and written recordings of the conversations between Taylor and the other pilots of Flight 19 do not indicate magnetic problems.[41]

Star Tiger and Star Ariel

G-AHNP Star Tiger disappeared on January 30, 1948 on a flight from the Azores to Bermuda; G-AGRE Star Ariel disappeared on January 17, 1949, on a flight from Bermuda to Kingston, Jamaica. Both were Avro Tudor IV passenger aircraft operated by British South American Airways.[42] Both planes were operating at the very limits of their range and the slightest error or fault in the equipment could keep them from reaching the small island. One plane was not heard from long before it would have entered the Triangle.[14]

Douglas DC-3

On December 28, 1948, a Douglas DC-3 aircraft, number NC16002, disappeared while on a flight from San Juan, Puerto Rico, to Miami. No trace of the aircraft or the 32 people onboard was ever found. From the documentation compiled by the Civil Aeronautics Board investigation, a possible key to the plane's disappearance was found, but barely touched upon by the Triangle writers: the plane's batteries were inspected and found to be low on charge, but ordered back into the plane without a recharge by the pilot while in San Juan. Whether or not this led to complete electrical failure will never be known. However, since piston-engined aircraft rely upon magnetos to provide spark to their cylinders rather than a battery powered ignition coil system, this theory is not strongly convincing.[43]

KC-135 Stratotankers

On August 28, 1963, a pair of US Air Force KC-135 Stratotanker aircraft collided and crashed into the Atlantic. The Triangle version (Winer, Berlitz, Gaddis[8][11][12]) of this story specifies that they did collide and crash, but there were two distinct crash sites, separated by over 160 miles (260 km) of water. However, Kusche's research[14] showed that the unclassified version of the Air Force investigation report stated that the debris field defining the second "crash site" was examined by a search and rescue ship, and found to be a mass of seaweed and driftwood tangled in an old buoy.

SS Marine Sulphur Queen

SS Marine Sulphur Queen, a T2 tanker converted from oil to sulfur carrier, was last heard from on February 4, 1963 with a crew of 39 near the Florida Keys. Marine Sulphur Queen was the first vessel mentioned in Vincent Gaddis' 1964 Argosy Magazine article,[8] but he left it as having "sailed into the unknown", despite the Coast Guard report, which not only documented the ship's badly-maintained history, but declared that it was an unseaworthy vessel that should never have gone to sea.[44][45]

Connemara IV

A pleasure yacht was found adrift in the Atlantic south of Bermuda on September 26, 1955; it is usually stated in the stories (Berlitz, Winer[11][12]) that the crew vanished while the yacht survived being at sea during three hurricanes. The 1955 Atlantic hurricane season shows Hurricane Ione passing nearby between the 14th and 18th of that month, with Bermuda being affected by winds of almost gale force.[14] It was confirmed that the Connemara IV was empty and in port when Ione may have caused the yacht to slip her moorings and drift out to

Friday, 7 October 2011

MY FIRST TECHNICAL PAPER PRESENTION and WON SECOND PRIZE!!!!













AN INNOVATIVE GUIDENCE SYSTEM TO TRACK AND ATTACK MOVING TARGETS










BESTOWED BY


B.SUBASHRI


PRE Final year CSE


P.PRIYADHARSHINI


Pre-final year CSE


Contact:subashathriya7@ymail.com










ABSTRACT






In this paper, we propose a new missile guidance technique that is an ideal support for surface-to-air and air-to-air cruise missile attack. Our technique exemplifies the usage of real time video camera for target tracking which is once impossible to attain due to the lack of real time video processing techniques. But several advancements have been made in the field of digital video processing that promises to provide reliable support for real time systems. Recent innovation in discovering objects in videos provides solution for unsupervised object discovery which was believed impossible a decade earlier. Our paper focuses narrowly on the way the targets are being identified rather the whole system itself. Though our technique works complimentary to the present guidance systems, it’s possible to use it as a standalone technique under certain threshold conditions which we reveal later.










INTRODUCTION


A Missile is a rocket carrying a warhead of conventional or nuclear explosives; may be ballistic or directed by remote control. A missile is not just a carrier of military warheads but it’s more than that. A missile could be anything from a rock that you pick up off the ground and throw at an enemy, to a spear, an arrow, a bullet, up to a multi-staged rocket carrying multiple MIRV-type nuclear weapons. Basically there are two types of missiles.


• Ballistic Missiles


• Cruise Missiles


A ballistic missile is a missile that follows a sub-orbital ballistic flight path with the objective of delivering a warhead to a predetermined target. The missile is only guided during the relatively brief initial powered phase of flight and its course is subsequently governed by the laws of orbital mechanics and ballistics.


A cruise missile is a guided missile that carries an explosive payload and uses a lifting wing and a propulsion system, usually a jet engine, to allow sustained flight; it is essentially a flying bomb. Cruise missiles are generally designed to carry a large conventional or nuclear warhead many hundreds of miles with high accuracy. Modern cruise missiles can travel at supersonic or high subsonic speeds, are self-navigating, and fly on a non-ballistic very low altitude trajectory in order to avoid radar detection.


Obviously Cruise missiles possess greater power and threat to military and defense attacks. But designing a Cruise missile posts numerous challenges since its being semi-autonomous in various aspects. Especially guidance techniques used differentiates the capability of the missile under concern.


ROLE OF GUIDANCE SYSTEMS IN MISSILES


Missile guidance refers to a variety of methods of guiding a missile or a guided bomb to its intended target. The missile's target accuracy is a critical factor for its effectiveness. Guidance systems improve missile accuracy by improving its "Single Shot Kill Probability" (SSKP).


These guidance technologies can generally be divided up into a number of categories, with the broadest categories being "active," "passive" and "preset" guidance’s. Missiles and guided bombs generally use similar types of guidance system, the difference between the two being that missiles are powered by an onboard engine, whereas guided bombs rely on the speed and height of the launch aircraft for propulsion.


CATEGORIES OF GUIDANCE SYSTEMS


Guidance systems are divided into different categories according to what type of target they are designed for – either fixed targets or moving targets. The weapons can be divided into two broad categories.


• Go-Onto-Target (GOT)


• Go-Onto-Location-in-Space (GOLIS)


A GOT missile can target either a moving or fixed target. The trajectory that a missile takes while attacking a moving target is dependent upon the movement of the target. Also, a moving target can be an immediate threat to the sender of the missile. The target needs to be eliminated in a timely fashion in order to preserve the integrity of the sender.


A GOLIS missile is limited to a stationary or near-stationary target. In GOLIS systems the problem is simpler because the target is not moving.


EXISTING GUIDANCE SYSTEM OVERVIEW


1) BEAM RIDER GUIDANCE


The beam rider concept relies on an external ground- or ship-based radar station that transmits a beam of radar energy towards the target. The surface radar tracks the target and also transmits a guidance beam that adjusts its angle as the target moves across the sky. The missile is launched into this guidance beam and uses it for direction. Scanning systems onboard the missile detects the presence of the beam and determine how close the missile is to the edges of it. This information is used to send command signals to control surfaces to keep the missile within the beam. In this way, the missile "rides" the external radar beam to the target.


2) COMMAND GUIDANCE


Command guidance is similar to beam riding in that the target is tracked by external radar. However, second radar also tracks the missile itself. The tracking data from both radars are fed into a ground based computer that calculates the paths of the two vehicles.










3) HOMING GUIDANCE


Homing guidance is the most common form of guidance used in anti-air missiles today. Three primary forms of guidance fall under the homing guidance umbrella--semi active, active, and passive.






i) SEMI-ACTIVE HOMING GUIDANCE


A semi-active system is similar to command guidance since the missile relies on an external source to illuminate the target. The energy reflected by this target is intercepted by a receiver on the missile. The difference between command guidance and semi-active homing is that the missile has an onboard computer in this case. The computer uses the energy collected by its radar receiver to determine the target's relative trajectory and send correcting commands to control surfaces so that the missile will intercept the target.


ii) ACTIVE HOMING GUIDANCE


Active homing works just like semi-active except that the tracking energy is now both transmitted by and received by the missile itself. No external source is needed. It is for this reason that active homing missiles are often called "fire-and-forget" because the launch aircraft does not need to continue illuminating the target after the missile is launched.


iii) PASSIVE HOMING GUIDANCE


A passive homing system is like active in that the missile is independent of any external guidance system and like semi-active in that it only receives signals and cannot transmit. Passive missiles instead rely on some form of energy that is transmitted by the target and can be tracked by the missile seeker.










iv) RETRANSMISSION HOMING GUIDANCE


A more unusual example of homing guidance is the retransmission method. This technique is largely similar to command guidance but with a unique twist. The target is tracked via an external radar, but the reflected signal is intercepted by a receiver onboard the missile, as in semi-active homing. However, the missile has no onboard computer to process these signals. The signals are instead transmitted back to the launch platform for processing. The subsequent commands are then retransmitted back to the missile so that it can deflect control surfaces to adjust its trajectory.


BEAM RIDER GUIDANCE






COMMAND GUIDANCE










HOMING GUIDANCE






SEMI-ACTIVE HOME GUIDANCE






ACTIVE HOMING GUIDANCE














PASSIVE GUIDANCE


































RETRANSMISSION HOMING GUIDANCE






DIFFICULTIES IN SURFACE-TO-AIR AND AIR-TO-AIR MISSILE IMPLEMENTATION


 Setting multiple target and simultaneous missile attacks is almost impossible.


 Both attacker and target will be in motion.


 Possibility of Self-attack.


 Probability of success is minimum


PROPOSED SYSTEM


Considering the flaws of the above listed guidance systems we developed yet another missile guidance system that overcomes most of the limitations mentioned.


BRIEF OVERVIEW


Our system makes use of a fully automated high resolution digital camera for the purpose of tracking the target body. The video obtained will be processed to detect the motion of the target. The guidance system will send a hardware trap after finalizing the motion change. The Interrupt is nothing but a command to the guidance computer to turn the missile to respective degree focussing the target. Thus the target body is tracked effectively without any external signalling as well as with full automation. Detailed discussion about the guidance system is as follows.


ARCHITECTURE OF OUR PROPOSED VIDEO GUIDANCE SYSTEM


As shown in the figure, Our Guidance system consists of the following important functional blocks.


• Real-Time Capturing Device


• Location and Scale Estimation


• Motion Modelling


• Guidance Centre


REAL-TIME CAPTURING DEVICE


The missile consists of a high resolution camera that captures the target body with maximum frames per second. As soon as the camera captures the video it immediately split into individual frames for processing. The camera’s zooming power is the critical factor which determines the performance measure in our case. Suitable camera selection solves such a problem.






























LOCATION AND SCALE ESTIMATION


After splitting the video into frames the next step is to find a number of patches to generate the visual words. In this paper, we have adapted a robust operator called Maximally Stable Extremal regions (MSER) operator. MSERs are a part of image where the local contrast is high. Features are then extracted from the MSERs by Scale-Invariant feature transform (SIFT). The SIFT descriptor is collected from all the images and are vector quantized using k-means clustering. The resulting cluster centres form the dictionary of visual words. The visual words is represented as w = { w1, w2, w3, ...., wn} , here we take n=50. The visual words are nothing but the Estimates for Location and scale of the desired target object. Note that the acquisition of visual words does not require any labelled data, which shows the unsupervised nature of this system.


calculation. Thus the prediction will be right as long as the target exhibits the constant directional motion. Only if there is a deviation the system’s will go wrong (for only one instance).By the next prediction it will correct the guidance information and send immediately to the guidance computer. A probability data Association problem is there while comparing the predicted and observed results. This PDA problem is solved by using a PDA filter. A PDA filter is a fuzzy logic that calculates correction values to the guidance system.






GUIDANCE CENTRE


Guidance centre is nothing but a computer that includes a fuzzy circuit which selects the missile path according to the predicted and observed values. Suppose if the target’s motion is the same as that of the predicted direction and displacement, the Guidance computer maintains the previous command to the missile tracker. Otherwise, depending upon the displacement, the guidance computer calculates the turning angle and optimal speed to the missile tracker.


HOW TO MAINTAIN THE RELATIVE SIZE OF THE TARGET IN THE CAMERA FRAME?


Let us review the important critical issue in our guidance system i.e How to maintain the optimal size of the target body in our capturing device?


This can be achieved by robustly automating the camera focus handle. Let’s explain the facts using some simulation.


Let,


 The camera’s total angle is 360’ (single rotational focuser)


 The maximum range of the camera is X km


 The feasibility distance be Y m (The distance at which the target relies at the centre)


 Current position of the target is Z km


Then,


Focus angle F = {[Z/(X – Y)]*360’}


- if and if only Z


The distance between the target and the missile can be easily achieved by Doppler Effect of stationary waves.










WORKING SCENARIO OF OUR PROPOSED SYSTEM:


Let’s simulate the working scenario of our proposed system. Consider a Target T is in motion and assume we need perform a surface-to-air attack. Initially the camera is controlled by a ground system that contains radar for initially locating the target. Once the missile’s camera is able to capture the target, it sends a trap to the ground controller. Now the Ground controller will issue a launch of the missile. The missile, with its onboard camera predicts and approaches the target. Once the target is liable to be attacked, the missile fires.


The following diagrams show how the frames after extraction being processed and the missiles intelligence in deciding the targets path.


We simulate the tracking functionality of our system using some snapshots from the camera virtually. We have taken a case where the camera’s angle is limited to 8 angles namely North, South, West, East, Northeast, Northwest, Southeast, and Southwest.






FRAME 1


Let the camera has been initialized to focus the target body at the centre of the frame position. This can be done before missile launch using a ground radar station.






FRAME 2


Let the target moves along Northeast direction (45*).






FRAME 3


Now our Guidance system compares the 1st and the current (2nd) frame and predicts the direction and velocity model of the moving target. Then it will give instruction about the direction and angle to which the camera should be turned. Note that the camera performs a ‘Double jump’ in order to capture the target at its centre. Meanwhile it calculates the next move using the PDA (predictive filter).






FRAME 4


The missile’s prediction is correct and hence it needs no correction thereby it predicts for the next position in the same manner. Assume that the target deviates from the predicted position by an angle x*.










FRAME 5


Now the System’s prediction is obviously wrong. The centre part of our frame corresponds to a wrong position since the target deviates. Hence a correction is needed to be done in the inputs. This is done by the correction filter in the diagram shown earlier.






FRAME 6


Now the System performs a correction over its prediction parameters (i.e) in terms of angle and in terms of velocity model. Now the guidance system again issues a ‘double jump’ in order to track the current position of the target at the centre.










ADVANTAGES OF OUR PROPOSED SYSTEM


 Cost effective


 Reliable performance


 Implementation complexity is being reduced


 Robust


 Scalable


OTHER RELATIVE APPLICATIONS OF OUR PROPOSED SYSTEM


This Video object discovery technique can be applied to variety of fields even though the breakthrough application will be on Defence purpose. Some of them are….


a. High Level Video Content analysis


i. Content based Multimedia Search


ii. Automated High level video editing technology


iii. Forensic video analysis systems


b. Fully automated Cricket Cameras


c. Spatial data mining










CONCLUSION


We presented a new innovative guidance system for cruise missiles. We justified that our system increases performance and robustness when used as a complementary with the existing guidance systems. Also we proved that our approach can be operated standalone at certain instances without compromising the performance metrics. With the innovation in camera techniques and video object discovery techniques, our system will also evolve. It’s not our aim to increase violation by increasing ballistic weapons, but, our current scenario demands great advancements in Military and defence area to meet the challenges that are upcoming from terrorist attacks and other countries.






REFERENCES






1. “Missile Survey: Ballistic and Cruise Missiles” by Andrew Feickert, CSS report, 2007


2. “Multimedia Image and Video Processing” by Ling Guan, Sun-Yuan kung, 2001


3. “DISCOV: A Framework for discovering objects in videos” by David Liu and Tsuhan Chen, IEEE transactions on Multimedia, feb-2008


4. “Video retrieval based on Object discovery” by David Liu and Tsuhan Chen, Science direct, 2007