MET4994_5994_RS_Lec17_S11

MET4994_5994_RS_Lec17_S11 - MET MET 4994 Remote Sensing:...

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MET 4994 Remote Sensing: Radar and Satellite Meteorology MET 5994 Remote Sensing in Meteorology Lecture 17: February 18, 2011 Radar Hardware
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How does radar work? Active remote sensors emit electromagnetic 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 electromagnetic energy. Objects (raindrops, ice, snow, birds, insects, terrain, and buildings) reflect that energy. Part of the reflected (backscattered) 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.
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Simplified block diagram of a pulsed weather Rinehart (5 th edition 2010)
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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. Klystron: 1) Easy waveform control 2) More powerful 3) Purer frequencies Solid state transmitter Phased-array antenna radar
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Modulator Switch the transmitter on and off and to provide the correct waveform for the transmitted pulse.
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This note was uploaded on 09/13/2011 for the course MET 4994 taught by Professor Haijan during the Spring '11 term at FIU.

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MET4994_5994_RS_Lec17_S11 - MET MET 4994 Remote Sensing:...

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