RADAR2009_Pres - Radar Technology Andrew Chapello Natalie...

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Radar Technology Andrew Chapello Natalie Kociubinski Terrence Yeo 12/17/2009 1
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• Introduction (watch us!) • What is Radar? • History of Radar Development • Basic schematic • Components of Modern Radar – Modulator – Transmitter – Antenna – Receiver • Radar Physics • Modern Radar Uses Agenda 12/17/2009 2
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12/17/2009 3 What is Radar? Radar is a system which uses electromagnetic waves to identify the location, speed, and altitude of both stationary and moving objects for various purposes Basic Facts Short for Radio Detection and Ranging (RADAR) – originally called Radio Detection Finder Primarily developed for use in the aerospace and defense industries, but has since been expanded to be used in other scientific pursuits Radar devices are often characterized by a large antenna in the middle of a parabolic arc, much like the device to the left The technology that allows radar to function is applicable in many different household products and processes Radar is also used in many different sporting and recreational pursuits, such as baseball, racing, hunting, and even fishing
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12/17/2009 4 History of Radar Development Christian Hülsmeyer patents first radar technology Nikola Tesla discovers tracking technology 1904 1917 Heinrich Hertz discovers that some materials reflect radio waves 1887 1940 Allen DuMont proposes a “ship finder” device to the US Army 1932 Two scientists demonstrate first air defense radar system to British MIT scientists discover the magnetron oscillator, high frequencies 1937 The Doppler principle is first studied and incorporated into radar systems 1950s The US develops the “Early Warning Line” of radar to warn of Soviet attack 1950s 1941 Ground Controlled Intercept and Plan Position Indicators invented by military 1951 First recorded “hook echo” on radar associated with thunderstorm FAA requires that all commercial planes carry a radar beacon for Air Traffic Control 1960 Today 1954 Radar gun (traffic, sports) invented by Bryce Brown in Chicago and is first used by CPD
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Basic Block Diagram 12/17/2009 5 Duplexer Transmitter Pulse Modulator ) Antenna
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The four parts which we will focus on: Transmitter Antenna Receiver 12/17/2009 6 Components of Modern Radar Systems Modulator
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The Modulator – provides a voltage of current waveform to the transmitter; contains some means for storing energy and a switch to control the discharge of energy into the load. Components of Modern Radar Systems 12/17/2009 7 Pulse Modulator Transmitter Antenna Receiver
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ECE 317 Concepts 12/17/2009 8 Gaseous State Electronic Switch Capable of handling high voltage and currents but extremely fragile The Thyraton Gas Tube an electronic switch Solid State Electronic Switch Handles a maximum current magnitude but is more durable compared to the glass tube The BJT an electronic switch The Thyraton Gas Tube is analogous to the BJT transistor! Recall HW1P1… resistance:
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RADAR2009_Pres - Radar Technology Andrew Chapello Natalie...

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