Term Paper Example 2

Term Paper Example 2 - Automated Highways ESE 319...

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Automated Highways ESE 319 – Introduction to Electromagnetic Fields and Waves
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2 Application Description As increasing urban density oozes into greater suburban sprawl the automobile becomes an omnipresent fixture of American life. Those who use an automobile to commute to work can undoubtedly share stories of traffic frustration. Although voicing one’s frustration can relieve stress, it does nothing to fix the problem. In a high traffic situation average travel speeds on main traffic arteries drop to a frustrating 36 mph at rush hour, leading annually to some 5 billion collective hours of delay and estimated productivity losses of $50 billion. 1 In addition to the economic losses an increased amount of exhaust gasses are released at the slower speed negatively impacting the environment. To alleviate the stress on both the environment and commuters it is proposed that an automated highway system be implemented. Such a system would efficiently route traffic through congested areas reducing stress and pollution in addition to freeing the driver to be productive while they are in the car. A key component of the automated highway system is the sensor system that determines the speed and position of the car on the roadway. A popular system is the magnetic marker method. Magnetic bars are inserted into the roadway and their corresponding magnetic filed is detected by a magnetometer, allowing roadway position calculation. Additionally researchers have developed signal encoding schemes to embed other information such as preview road curvature. The magnetic bars polarity is alternating allowing for a binary encoding. 2 Design Specification If we assume to use the magnetic marker method then we limit the implementation such a system. Since magnetic markers are passive their field strength is relatively weak. Therefore the sensor would need to be close to the source of the field. This eliminates the application of inter-vehicle sensing. Large distances are required between moving vehicles to ensure a safe stop. If we consider a high performance car, the Porsche Boxster S, its stopping distance from a speed of 60mph is 105 feet. This distance may prove problematic as magnetic field strength falls off as a square of the
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Term Paper Example 2 - Automated Highways ESE 319...

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