MET4300_SWX_LEC4

MET4300_SWX_LEC4 - MET 4300 Lecture 4 Radar and Satellite...

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Unformatted text preview: MET 4300 Lecture 4 Radar and Satellite In-situ vs. Remote Sensing Sensing : Using instruments/devices to measure parameters Thermometers measure temperature, radar guns measure the speed of passing cars Two categories of sensing devices: in-situ sensing and remote sensing In-situ sensing: In-situ sensing/measuring devices are in contact with the medium or object they are sensing. Examples: ASOS, Rawinsonde, buoys, reconnaissance plane, staff stream gauge Active vs. Passive Remote Sensing Active remote sensors emit electromagnetic (EM) waves that travel to an object and are reflected back toward the sensor. Example: X-Ray, Radar, Lidar Radar works by transmitting a pulse of EM energy. Objects (raindrops, ice, snow, birds, insects, terrain, and buildings) reflect that energy. Part of the reflected energy is received back at the radar. Once the radar receives the reflected signal, computer programs and meteorologists interpret the signal to determine where it is precipitating. Active vs. Passive Remote Sensing (Cont.) Passive remote sensors observe EM waves emitted by objects. Example: Camera; Satellite IR, Visible, Passive Microwave sensors Satellite visible sensors: visible imagery is available only during daylight hours since sunlight is reflected only during that period. Satellite IR sensors: Infrared energy is emitted 24 hours a day from the earths surface and the atmosphere and is sensed by satellites continuously. How Does Radar Work? Radar emits a pulse Travels until it reaches a target Reflected back to antenna Time of travel tells distance Brightness of echo tells size and/or number of scatterers Simplified block diagram of a pulsed weather Rinehart (5 th edition 2010) Transmitter: the source of EM radiation emitted by a radar Magnetron: A self-exciting oscillator tube used to produce the radio frequency signal transmitted by some radars....
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This note was uploaded on 02/18/2012 for the course MET 4300 taught by Professor Staff during the Spring '08 term at FIU.

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MET4300_SWX_LEC4 - MET 4300 Lecture 4 Radar and Satellite...

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