Application of Wave Technology in Military Aspect

Application of Wave Technology in Military Aspect â€Å"Hide and Seek† in the World of Wave Student name: Choi Ho Lam Thank you for giving this valuable chance for me to investigate on this topic. As this topic involves military technology, it gives a deeper understanding of wave principle and usage in daily life. However, in normal settings, such kind of topic is not included, as it can be quite controversial. Fortunately, in this CCST course, I am allowed to choose this topic and enrich my engineering knowledge to a deeper extend. National geographic After watching the show â€Å"Hilter’s Stealth Fighter†, it gives me a clearer direction on starting the research on this topic. It enriches my knowledge on the use of RAM in relation with RF wave properties. Teaching assistants of the course The teaching assistants in the course are helpful. Their opinions help me to narrow my direction in investigating to specific topics like radar and specific technology related to radar. Without their help, I would still wonder in the wild world of military and aimlessly searching for a suitable topic. 2. Introduction Radar detection and stealth technology are like a game of â€Å"hide and seek† with the application of wave technology. They share the opposite aims, either finding one or avoid from being found. In the world of military, this is a game that changes the fate of the world and losing is not an option. During the World War II, the deployment of radar in British had changed the tide of battle in the English Channel. Fighting against 2550 German fighters and bombers, the Royal Air Force (RAF) was able to attack strategically and stopped German invasion with just 1963 planes. After this battle, British served as the last stand among European nations against Nazi Germany. With such important history, the military value for radar as well as its counterpart, stealth technology were deeply investigated. Nazi Germany had suffered from a direct defeat from this battle. Since then, Nazi Germany carried out various researches on stealth aircrafts. Just one month near the end of WWII, the first prototype stealth bomber, Horten Ho 229 was developed. Recent research from National Geographic show that such plane decreases the detection range of British radar by 37%, which is already enough for wiping out the entire RAF. It was so fortunate that the plane wasn’t in mass production or the course of history would have been change completely. This paper aims at studying the application of wave technology in the use of radar, as well as the principles in some of the counter radar measures. Since it is a CCST coursework, some of the complicated mathematical procedures and modern method of radar jamming would be omitted. Nevertheless, by studying such technology, we can establish a better understanding of different wave phenomena and know how they change our life. 3. Content 3.1 Radar Radar stands for Radio Detecting and Ranging. In general, radar detects a far object by sending a pulse of EM wave and measures the time and frequency for the reflected pulse. By analyzing these factors, the speed and the distance of the far object can be found. In a macroscopic view, radar consists of 3 basic parts, a transmitter, a duplexer and a receiver. The transmitter emits a short-duration high-power radio frequency (RF) pulse. The pulse will travel through the transmitter antenna and emit outwards. The antenna can give appreciate space for efficient distribution of RF pulse. When the RF pulse hit an obstacle, the RF pulse is reflected back to the receiver. The receiver antenna will receive the signal and analysis the time of travel as well as the frequency of reflected pulse. Since the receiver antenna is very sensitive as it is assumed to be receiving the small pulse reflected back from far distance, a duplexer is installed to switch the between two antenna. This can ensure only one antenna is in use and prevent receiver antenna receiving signal directly from the transmitter antenna, which can potentially damage the receiver antenna. In a microscopic view, an alternating current (AC) is supplied to the antenna. It then produces a perpendicular alternating magnetic field around the antenna. By Lenz’s Law, for a closed loop carrying a current, it would produce a magnetic field perpendicular to current around the loop. In reverse, for a closed loop experience a change in magnetic field, a current perpendicular to magnetic field is generated to oppose the change. The combination of alternating current and magnetic field produces the electromagnetic wave that used for detection. The frequency of the EM wave can be changed by modifying the AC frequency. The frequency of the electromagnetic wave is usually set to between 3 kHz to 300 GHz at radio frequency (RF). It varies depends on the usage. With a higher frequency, using relation with speed of light (C) and wavelength (ÃŽ ») C=FÃŽ », the wavelength of RF wave is shorten. This decreases the electrical length of the antenna to and makes it easier to build. In military use, the RF pulse would set to lower frequency portion in the RF spectrum, usually between 7 to 11.2 GHz, which is called the X band. Being in RF spectrum, the high frequency radar pulse can create a radar cross-section of aircraft with a higher resolution, which helps identify aircraft more accurately. In more advance use, a much lower frequency is used to reveal stealth aircraft since it can give a much more sensitive signal. With a low frequency, the wavelength of radar pulse is comparable to size of stealth fighter and creates a scattering in resonance region instead of optical region, turning it more visible on radar. However, the frequency of the radar pulse cannot be lower than 800 MHz, otherwise the EM pulse would have insufficient penetrating power and easily be absorbed by raindrops. Other than that, the resolution of low frequency radar is relatively poor, and gives a poor display. It is only effective against stealth aircraft of length comparable to wavelength . When the radar pulse is bound back to the radar, the antenna experience an alternating change in magnetic field. This will produce an alternating electrical field and thus an AC current to flow in circuit. Since the returning signal is weak, it would pass through an amplifying circuit to increase the amplitude. In analyzing the signal, the frequency and time of travel would be taken to find the speed and velocity of detection target. When the radar pulse reaches an object, it is reflected and the frequency is shifted by Doppler Effect. Since the speed of RF wave is always the speed of light (C), the distance (S) can be express as a time (t) function, S = Ct/2. It is divided by two since the radar pulse travel through the same distance twice. To calculate speed of moving object, we can find out the change in frequency (Doppler frequency) of the returning wave. If the far object is moving, the object would create a Doppler shift to the radar pulse. This Shifted frequency () can be expressed by original frequency (), the moving speed (V) and speed of light (C). , which gives us the Doppler frequency () . For convenience, one assume, such that, and simply the equation as . 3.2 Radar jamming and deception Radar jamming and deception usually refer to the intention of saturating the radar with noise and false information, lowering the detection range of radar as well as the accuracy of the radar. There mainly two types of jamming, either mechanical jamming or electronic jamming. Mechanical jamming Mechanical jamming usually refer to use of physically existed thing to reflect and re-reflect RF signal back to radar, causing the radar to be saturated with false return signal. The commonly used mechanical jamming methods that adopt wave principles are chaff and corner reflectors. Chaff is bundles of reflective aluminum strip of various lengths. The aircraft drops these strips in air. When radar pulse reaches these strips, the radar pulse is reflected and scattered in all direction, creating huge return signal to the receiver. This could deceive the radar as â€Å"seeing† huge plane and deplete enemy resources like ammunition on shooting down the false target. Corner reflector reflects incoming radar pulse at other angle. Corner reflector is composed of either two or three reflective planes, perpendicular to each other. This configuration allows the incoming radar ray fully reflected back to the source. Yet this also increases special occupation of corner reflector, making it harder to carry by aircraft. The tails of the stealth fighter are designed to be acute angle, such that it avoids forming corner reflector, allowing radar to identify the airplane. Electronic jamming Electronic jamming refers to the active emission of RF pulse to the radar, saturating the radar with false return and noises. It includes spot jamming, sweep jamming, barrage jamming, cover pulse jamming and digital radio frequency memory jamming. Spot jamming, sweep jamming, barrage jamming uses the same principle, occupying the radar with high energy pulse and causing destructive interference of the RF wave. Spot jamming refers to jamming one specific frequency with high energy signal. Sweep jamming refers to jamming one specific frequency with high energy signal when the radar is switching from one frequency to another. Barrage jamming refers to jamming all specific frequency with high energy signal, however since it cover full range of frequency, each frequency are partially jammed. Cover pulse jamming refers to false return signal as noise. As radar receives certain amount of ambient noise, for example, like scanning through eagle and other types of bird, so it could be used as disguise for fighter to hide from radar. With pulse jamming system installed, the aircraft analysis the incoming radar signal and find suitable frequency for false noise return. Digital radio frequency memory is a repeater technique that analysis the incoming radar pulse and changes the returning frequency as well as time of return. The signal would be delay and diminish. This gives a false sign of far distance between aircraft and radar. Moreover, the frequency would also be shifted and produce a false Doppler shift on radar signal. This returns with false information about the velocity of aircraft. 3.3 Use of RAM Besides of active jamming and deceiving radar, the military develop RAM to avoid radar detection from the enemy. RAM stands for the Radar-Absorbance Material. According to the detecting radar frequency, different types of RAM are used to build stealth aircrafts. Iron ball paint absorber Iron ball paint is one of the mostly used RAM. It contains tiny spheres coated with carbonyl iron and ferrite. As radar waves induce molecular oscillation in this paint, the energy would dissipate as heat. This can absorb the radar and reduce the reflection of radar wave. Re-entrant triangles The structures of re-entrant triangles in between the surface foam absorber layer help reduce reflection of radar ray back to radar transceiver. Inside the foam absorber layer, the foam was cut into tiny square pyramid. This structure reflect incoming wave several times and reduce the energy of the radar wave. In practice, the width and height would change according to the incoming radar wave. The main purpose of adjusting height and width ratio is to achieve maximum internal reflection within the plane surface as possible. Jaumann absorber The wave principle deployed by Jaumann absorber is destructive interference. Gerneally, Jaumann absorber consist of two equally spaced layer and a ground metal plate. It cancels out the incoming wave by producing destructive interference. When a radar signal strikes on to the surface of Jaumann absorber, the wave split in to two waves, one is reflected at glossy surface of the Jaumann absorber, while the other enters the layer. The ray will then reflect back by the metal ground plate. The two layers having a total spacing of ÃŽ »/4 will allow the wave reflected back to surface at anti-phrase compare to incoming ray, where the ray have travelled a total of ÃŽ »/2 distance. Conclusion Radar principle make use of various wave property in tracing the enemy. In engineering, there is a sub-discipline for radar analysis, for a more precise interpretation of radar signal. This paper includes only few example and it was just a corner of iceberg. However, in just a brief analysis, we can see advancement of technology as people know more about wave and using this knowledge to build stealth aircraft. This game of â€Å"hide and seek† can be devastating to world as it brings a much higher casualties in war, however this game has also proven to be saving life war and pushing the advancement of technology. Would this game be beneficial to human? It would be an unanswered question waiting for the people to decide. Reference Radar. (n.d.). Retrieved from http://en.wikipedia.org/wiki/Radar ODonnell, Robert. RES.LL-001 Introduction to Radar Systems, Spring 2007. (MIT OpenCourseWare: Massachusetts Institute of Technology), http://ocw.mit.edu/resources/res-ll-001-introduction-to-radar-systems-spring-2007 (Accessed 28 Nov, 2014). License: Creative Commons BY-NC-SA Wolff, C. (n.d.). Radar Principle. Retrieved from http://www.radartutorial.eu/01.basics/Radar Principle.en.html Toomay, J., Hannen, P. (2004). Radar Principle for the Non-Specialist (3rd ed.). SciTech Publishing. Hitlers Stealth Fighter [Motion picture]. (2009). United State of America: National Geographic. Garcia, L. (n.d.). How Waves Helped Win the War: Radar and sonar in WWII. Retrieved from http://www.ww2sci-tech.org/lessons/lesson3.pdf Deb, N.N. (2006). Telecommunication Engineering (1st ed.). New Age International. Bole, A., Wall, A., Norris, A. (2014). Radar and ARPA Manual Radar, AIS and Target Tracking for Marine Radar Users. Elsevier. Varshney, L. (2002). Technical Report Radar Principles (3rd revision.). NY: Syracuse Research Corporation. Lorell, M. (2003). The U.S. Combat Aircraft Industry, 1909-2000. National Defense Research Institute. Radar jamming and deception. (n.d.). Retrieved from http://en.wikipedia.org/wiki/Radar_jamming_and_deception Radar-absorbent material. (n.d.). Retrieved from http://en.wikipedia.org/wiki/Radar-absorbent_material Zikidis, K., Skondras, A., Tokas, C. (2014). Low Observable Principles, Stealth Aircraft and Anti-Stealth Technologies. Journal of Computations Modelling, Vol.4(No.1, 2014), 129-165. Retrieved from http://www.scienpress.com/Upload/JCM/Vol 4_1_9.pdf Stealth Technology. (n.d.). Retrieved from http://www.slideshare.net/search/slideshow?searchfrom=headerq=stealth technology

Privacy And The Internet Essay -- Web Cyberspace Internet papers

Privacy and the Internet The natural progression of the Internet and emerging technologies is towards streamlining our lives both personally and professionally. Instantaneous communications and available on-line services continue to reduce the physical distance between individuals. Almost anything is now available in cyberspace from shopping, schooling and education, on-line trading, banking, to social and political on-line communities. On-line service providers are shifting from a product centric approach to a more personal and customized approach to marketing their products and services. The idea of one-to-one marketing is very powerful and has become an important tool for competing in the interactive age. One-to-one marketing takes a customer-orientated approach to selling; customers are treated as individuals with different interests and needs. We respond positively to individual attention; when we visit a web site we want to see products and services of interest to us not every available product. We do not want to waste our time. For many people, time is money and the convenience factor ways heavily on the decision to return to a web site. Are the benefits of electronic communication at the expense of our privacy? How does the Internet affect the availability and use of our personal information? The Internet brings another dimension to the issue of privacy. Whether you are voting on-line or buying a book from Amazon.com you must consider how much personal information has been collected about you, with or without your consent, and how it can be used. Policies governing privacy on the Internet are still not clearly defined and many on-line users do not understand how the information they provide will be used. How much... ...activity are all available at the press of a button. Soon we will have on-line refrigerators that can place grocery orders, washing machines that can access the Internet to determine the best wash cycle for a delicate fabric and Internet connectivity available from every room in the house. If we reap the benefits of communications technology, we must expect to pay the price with our privacy. Works Cited Bridis, Ted. Comcast Tracks Users Web Browsing. Los Angeles Times 12 Feb 2002. http:www.latimes.com/news/nationworld/politics/wire/sns-ap-internet-privacy/0212feb12.story (25 Feb 2002). Grossman, Lawrence K. The Shape of the Electronic Republic. Composing Cyberspace. Richard Holeton. United States: McGraw-Hill, 1998, 311-327. Birkets, Sven. Into the Electronic Millennium. Composing Cyberspace. Richard Holeton. United States: McGraw-Hill, 1998, 311-327. Privacy And The Internet Essay -- Web Cyberspace Internet papers Privacy and the Internet The natural progression of the Internet and emerging technologies is towards streamlining our lives both personally and professionally. Instantaneous communications and available on-line services continue to reduce the physical distance between individuals. Almost anything is now available in cyberspace from shopping, schooling and education, on-line trading, banking, to social and political on-line communities. On-line service providers are shifting from a product centric approach to a more personal and customized approach to marketing their products and services. The idea of one-to-one marketing is very powerful and has become an important tool for competing in the interactive age. One-to-one marketing takes a customer-orientated approach to selling; customers are treated as individuals with different interests and needs. We respond positively to individual attention; when we visit a web site we want to see products and services of interest to us not every available product. We do not want to waste our time. For many people, time is money and the convenience factor ways heavily on the decision to return to a web site. Are the benefits of electronic communication at the expense of our privacy? How does the Internet affect the availability and use of our personal information? The Internet brings another dimension to the issue of privacy. Whether you are voting on-line or buying a book from Amazon.com you must consider how much personal information has been collected about you, with or without your consent, and how it can be used. Policies governing privacy on the Internet are still not clearly defined and many on-line users do not understand how the information they provide will be used. How much... ...activity are all available at the press of a button. Soon we will have on-line refrigerators that can place grocery orders, washing machines that can access the Internet to determine the best wash cycle for a delicate fabric and Internet connectivity available from every room in the house. If we reap the benefits of communications technology, we must expect to pay the price with our privacy. Works Cited Bridis, Ted. Comcast Tracks Users Web Browsing. Los Angeles Times 12 Feb 2002. http:www.latimes.com/news/nationworld/politics/wire/sns-ap-internet-privacy/0212feb12.story (25 Feb 2002). Grossman, Lawrence K. The Shape of the Electronic Republic. Composing Cyberspace. Richard Holeton. United States: McGraw-Hill, 1998, 311-327. Birkets, Sven. Into the Electronic Millennium. Composing Cyberspace. Richard Holeton. United States: McGraw-Hill, 1998, 311-327.

How does steinbeck portray George, hero or villian? Essay

â€Å"Of Mice and Men† is based on the major themes of hard reality, dreams, companionship and tragedy; particularly relevant to 1930’s America, following the depression and economic poverty it caused. Steinbeck portrays George as a flawed character who doesn’t display archetypal heroic qualities, however the reader empathizes with him. Steinbeck therefore ultimately presents him as a anti-hero within the context of the narrative. At the beginning of the novel, Steinbeck portrays George as a flawed character. George and lennie travel to a ranch , indicating the unsettled lifestyle of men during 1930’s. Before arriving at the ranch, George loss his temper with lennie : â€Å"morosely† implying bad temper and unsociability, and perhaps emphasising George’s villainous side. another perspective may be the build up of Georges anger, due to complications in weed. Steinbeck implies this using the word â€Å"restless†. The enraged language heightens Georges villainous attributes, combined with adverbs â€Å"explodes† and â€Å"snapped†, increasing the readers confusion about George although they empathize with his hardships faced by staying with Lennie However, these hardships are questioned by his actions later in the novel. Georges relationship with lennie conveys his character as a anti-hero, however this doesn’t highlight his lack of conventional heroic attributes. Lennie’s portrayed as protective towards George: nobody hurts George† â€Å"Lennie growled†. Nonetheless, this juxtaposition intensifies the contrast between the pair. Perhaps Steinbeck uses this to intrigue the reader about the dynamics of their relationship, heightening the human side of George and allowing the reader to empathize with George under the circumstances. Steinbeck describes George as having â€Å"sharp strong features†: due to his work as a itinerant migrant worker during the US depression. However, the reader may begin to question if Steinbeck is using the adjectives to describe Georges physical appearance, or his strong character. Despite this, George’s most heroic quality is his intense care for others, specifically Lennie, where the reader observes the complexities of their companionship. â€Å"I never seen one guy take so much trouble for another† : Steinbeck allows the reader to notice Georges kinder human characteristics. On the other hand, Steinbeck uses the adverbs â€Å"morosely†: the negative language empathises Georges villainous side. Additionally, Steinbeck uses the verbs â€Å"snapped† and â€Å"glared† to present George as harsh and sharp. Combined with â€Å"harshly† and â€Å"briskly† the readers ambiguous reaction towards George is increased, and some sense of heroism is lost. the loss is intensified towards the end of the novel. In contrast to George, Steinbeck describes lennie as â€Å"patient†. juxtaposing Lennie’s innocence with Georges frustration. Despite this George looks â€Å"ashamedly† , which contrasts against his temper heightens his human characteristics compared with lennie â€Å"anguished face†. ** However this confuses the reader about Georges emotion towards Lennie’s, making the reader question whether Georges a hero or villain. The element of dreams is the most powerful symbol in the novel, representing the possibility of self-reliance and freedom. Steinbeck presents George as inventor of the dream, therefore his heroic attributes become visible. Steinbeck conveys George as essentially protecting other characters from the cruelties of the world. Additionally, Steinbeck portrays George as an inspirational welcoming character, as George allows candy and crocks to become â€Å"bemused by the beauty† of the dream. However this heightens their desperation and loneliness but also the trust and reliance they have in George. Even though each character subconsciously knows the dreams a unrealistic goal, they are still â€Å"amazed†. George spoke â€Å"reverently† conveys his deep respects and awe towards the dream, almost as if it was sacred. This could connect to his surname â€Å"Milton†: reference to paradises lost a 1930’s poem about the destruction of a perfect place. here, Steinbeck heightens his human attributes. perhaps another perspective could be that George allowed the character to dream falsely as he knew the dream wasn’t achievable. in the context of 1930’s economic situation, maybe he knew â€Å"they’d never do her† and he agreed as Lennie â€Å"usta like to hear about it†. on the other hand, the dream may have been created for Georges benefit and selfishness. Therefore, through George’s dream Steinbeck highlights both heroic and potentially villainous attributes of his character. In the last scene, George murders lennie not through an evil intention but a mercy killing. Steinbeck creates a paradox as George intends to kill lennie however George portrays being cruel to be kind. Steinbeck’s presentation of Georges internal conflict is finally resolved. The reader observes that the Curley will punish lennie brutally and slowly; â€Å"shoot for his guts†. Therefore the reader empathises with George, as he makes a conflicted decision between two actions. In contrast to George, Steinbeck portrays Curley as an archetypal villain. Curley is described as â€Å"terrier†. the malicious language elevates his villainous traits above Georges. combined with the adverbs â€Å"lashed† and â€Å"harsh† the readers negative reactions towards Curley heighten, as they’re unable to trust Curley, instead they feel a sense of alert and tension when he’s around. therefore, when comparing George and Curley, George villainous qualities decrease and his heroic actions become more visible. Despite Georges complaints about lennie, he feels a brotherly connection with Lennie because Lennie provides an escape form loneliness of a migrant workers who are † the loneliest guys in the world†. However, an alternative perspective that heighten George heroism, is that perhaps George killed lennie, as he realised Lennie was a danger to society. Overall, the reader witnesses the depth of the sacrifice George made, even though it shattered is own dreams, strengthening the readers empathy towards George. Despite this the reader is unable to forgive Georges actions. This concludes Steinbeck as portraying George as a conflicting character, an anti-hero.

Argumentative Essay On Civil Rights - 956 Words

Most of us today cannot say we’ve experience the horror of war. I infact have never. I’m ignorant to the subject, while others can say they’ve stared death in the face. We fought for slave rights, for equal rights, and allowed people to immigrate here believing America was a peaceful place. I infact am honored to be an American. I have rights, I do not serve under a dictator, but most countries arent as lucky as I. Unfortunately, tragedy is the only magnet that pulls us together. We have not learned from the sacrifices of our own sons and daughters. It is my hope that America can move on from its childish antics and turn away from all the violence. Hate goes back generations here. We stole peoples lands, and claimed them as our own. We†¦show more content†¦We have not forgotten, and we certainly aren’t forgiving. Instead, we are walling off countries so they can no longer travel here and make a better life for themselves. For certain tragedies we are vengeful to other countries. We view these people as aliens, or a threat. We shut these people out when they need us most. We have closed arms for these people. Refugees are dying, suffering critical injuries, and weve closed the doors. We fought back, killing thousands of innocents, and so little of the guilty. We are mirroring the exacts acts we swore never to repeat. We signed documents swearing we would make our future better. We are letting our founding fathers down. Our hope for the future is peace... It takes only a tragedy for Americans to come together to help, and accept each other. Only after a tragedy, we realize how much we need each other to overcome anything. Like bombings, bombings that happen so frequently. After every attack, love responds. Officials, even injured civilians help others. It not only was their job, but it’s the fact we believe innocent lives do not deserve to be taken. Why can’t it be like that all the time? Why is it that when people are slaughtered we finally realize were all equal? How exactly is it okay for us to attack other places, but its not okay for it to happen to us? Not only do we come together in rare times, but we dont pay attention to it after a while. We shield our children, and shield ourselves from the harshShow MoreRelatedShould Gays Be Allowed to Marry1476 Words   |  6 PagesThe Prusuit of Happiness! Should gays be allowed to marry? Stacey Dockery PHI103: Informal Logic (GSJ1231E) Instructor Name: Daniel Beteta September 3, 2012 Argumentative Essay on Gay Marriage Marriage: a legally recognized relationship, established by civil or religious ceremony, between two people who intend to live together as sexual and domestic partners. 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