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Topic: Types and uses of radar

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List of radars

Passive radar

Radar

Millimetre cloud radar

History of radar

3D radar

Millimeter Cloud Radar

Secondary surveillance radar

Synthetic aperture radar

Radar gun

Doppler radar

Stealth

Active Electronically Scanned Array

Air traffic control

NEXRAD

	Observing Systems at the NOAA Environmental Technology Laboratory
		Using pulsed lidar technology initially developed by the Department of Defense to detect objects in the water, FLOE is being developed to conduct airborne fisheries surveys to improve fisheries management and decrease costs.
		This scanning lidar is used in a variety of research investigations, including air-quality-related studies of flows in complex terrain, climate studies of cloud properties and stratospheric aerosol, and severe weather events such as wind shear and damaging downslope winds.
		The radar is often used by meteorologists as part of local research projects and by the University of Colorado in meteor trail studies.
	www.etl.noaa.gov /technology/tech.html (2682 words)

	Wikinfo \| Radar (Site not responding. Last check: 2007-11-05)
		Early radars used very long wavelengths that were larger than the targets and received a vague signal, whereas modern systems use shorter wavelengths (a few centimetres) that can image objects the size of a loaf of bread or larger.
		This means that a radar has a distinct minimum range, which is the length of the pulse divided by the speed of light, divided by two.
		The main advantage of the CW radars is that they have no pulsing, and thus no minimum or maximum ranges (although the broadcast strength imposes a practical limit on the later) as well as maximizing power on the target.
	www.wikinfo.org /wiki.php?title=radar (4541 words)

	Radar Summary
		Radar is used in many contexts, including meteorological detection of precipitation, air traffic control, police detection of speeding traffic, and by the military.
		Early radars used very long wavelengths that were larger than the targets and received a vague signal, whereas some modern systems use shorter wavelengths (a few centimetres or shorter) that can image objects as small as a loaf of bread or smaller.
		In the transmitted radar signal, the electric field is perpendicular to the direction of propagation, and this direction of the electric field is the Polarization of the wave.
	www.bookrags.com /Radar (7002 words)

	Radar
		Other scientists use radar for remote sensing applications, including mapping the surface of the earth from orbit, studying asteroids, and investigating the surfaces of other planets and their moons.
		The PPI displays the direction of the target in relation to the radar system (relative to north)as an angle measured from the top of the display, while the distance to the target is represented as a distance from the center of the display.
		Simple pulse radar requires precise timing circuits in the duplexer to prevent the transmitter from transmitting while the receiver is acquiring a signal from the antenna, and to keep the receiver from trying to read a signal from the antenna while the transmitter is operating.
	www.geocities.com /sinactamzt/RADARES2.htm (4867 words)

	ipedia.com: Radar Article (Site not responding. Last check: 2007-11-05)
		These so-called corner cubes are commonly used as radar reflectors to make otherwise difficult-to-detect objects easier to detect, and are often found on boats in order to improve their detection in a rescue situation.
		One serious limitation with this type of solution is that the broadcast is sent out in all directions, so the amount of energy in the direction being examined is subject to the inverse square law.
		Other mathematical developments in radar signal processing include time-frequency analysis (Weyl Heisenberg or wavelet), as well as the chirplet transform which makes use of the fact that radar returns from moving targets typically "chirp" (change their frequency as a function of time, as does the sound of a bird or bat).
	www.ipedia.com /radar.html (5421 words)

	More on Radar
		Radars use horizontal, vertical and circular polarization to detect different types of reflections.
		The main advantage of the CW radars is that they have no pulsing, and thus no minimum or maximum ranges (although the broadcast strength imposes a practical limit on the latter) as well as maximizing power on the target.
		The radar measures the distance to the reflector by measuring the time from emission of a pulse to reception, and dividing by the speed of light.
	www.eduhistory.com /radar.htm (2471 words)

	Telecommunication > Radar
		Radar sets attempt to reflect electromagnetic waves, notably radio waves and microwaves, from target objects.
		Long range radars tend to use long pulses with long delays between then, and short range radars use smaller pulses with less time between them.
		At the time he had been most interested in their use for communications, but he and his partner Hans-Karl von Willisen had also worked on radar-like systems.
	www.telecommunication.teleactivities.net /applications/radar.html (4459 words)

	Police Radar Accessories and Parts for All Brands, Makes and Models.
		We carry a complete line of accessories and parts for most makes, models and brands of police traffic radar units.
		If you are looking for an item that is not shown or would like to order any of our accessories of parts please give us a call.
		Small dash mount/ Rear deck mount can be used for all types of mounting situations.
	www.policeradar.com /Accessories.htm (128 words)

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