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Topic: Altimeter

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	Altimeter Watches
		Each of these multi-function watches feature a variety of functions, but an Altimeter feature is the one common feature that they all have.
		How an Altimeter Works / Predicting The Weather / Choosing An Altimeter / How To Use An Altimeter / Return Policy
		The Altimeter Store is a division of ROC Gear, Inc., your online specialty gear supplier.
	www.thealtimeterstore.com /watch.html (148 words)

	Rocket Altimeter
		The altimeter measures the air pressure surrounding the rocket.
		The altimeter will continue to save the data, until it runs out of memory (about 5 minutes after launch), or until the air pressure returns to the previous ground level point; in which case it assumes the rocket has made a landing on the ground.
		Even though the altimeter can be mounted firmly in the rocket, it is small enough and lightweight enough that it can also be slip it into a padded tube for quick installation into the rocket.
	www.apogeerockets.com /Altimeter.asp (1971 words)

	Suunto Altimeter Watches - watch reviews & free shipping
		An altimeter watch is a wristop instrument that allows the wearer to determine their current elevation.
		This is why many altimeter watches feature "temperature compensation," and why the altimeter must to be calibrated regularly (by simply entering the current barometric pressure or setting to a known altitude).
		Pilots of small planes often wear an altimeter watch as a back-up in case of instrument failure - although be aware that an altimeter of this type cannot be used successfully in a pressurized plane.
	www.suuntowatches.com /By_Function/Suunto_Watches_with_Altimeter/index.cat (450 words)

	Altimeter
		The altimeter is a sensitive barometer that measures air pressure.
		The altimeter is connected to the static ports.
		To display altitude accurately, the altimeter must be set to the current barometric pressure adjusted to sea-level pressure.
	www.abbysenior.com /aviation/altimete.htm (342 words)

	Altimeter \| World of Invention
		The aneroid altimeter derives a quantity for altitude by measuring the decreasing air pressure that occurs with increase in altitude, while a radio altimeter bounces a radio signal from an object aloft to the ground and determines the distance aloft as a function of the time it takes for the signal to return.
		The surface of the compartment bulges or contracts slightly as the outside air pressure changes, and the movements of the compartment are indicated on a needle which is connected to the box by a chain, lever, and springs.
		A drawback of the aneroid altimeter is its sensitivity to weather conditions.
	www.bookrags.com /research/altimeter-woi (646 words)

	altimeter - Search Results - MSN Encarta
		Altimeter, mechanical or electronic device commonly used in aircraft to measure vertical height above the surface of the earth.
		The successful development of a tiny radio tube whose possible applications include mechanical 'ears' for the deaf that are four times as sensitive as the present type, and police and foot-soldier radio receiving sets, have been announced by the Hytronic Laboratories at Salem, Mass., after two...
		altimeter, barometer, calipers, clock, compass, dipstick, dividers, gauge, Geiger counter, level, meter, micrometer, mileometer, odometer,...
	encarta.msn.com /altimeter.html (164 words)

	Radar Altimeter
		The radar altimeter is an instrument on a satellite that measures the distance from the satellite to the Earth's surface using a radar signal.
		The radar altimeter measures the altitude of the Earth's surface to determine ice sheet topography and small-scale ocean roughness.
		The GEOSAT radar altimeter contained an onboard calibration mode that was invoked twice daily to track waveform sample gain and attitude, wave height, automatic gain control, and height.
	nsidc.org /data/docs/daac/altimeter_instrument.gd.html (360 words)

	Static friction free altimeter - Patent 4052902
		The altimeter, as recited in claim 2, wherein said insulator means completely encapsulates said piezoelectrial transducer and fills said chamber to modify the amplitude of said vibratory motion.
		It is a further object of this invention to provide an altimeter with a static friction reducer having a noise absorber through which a vibration force is transmitted to a gear train driven by a pressure responsive aneroid.
		It is a still further object of this invention to provide an altimeter with a piezoelectric transducer responsive to an electrical signal derived from the operation of a four layer transistor diode device for attenuating static friction associated with a gear train through which a pressure responsive altitude sensor supplies an indicator with torque.
	www.freepatentsonline.com /4052902.html (2112 words)

	Altimeter Summary
		The altimeter is calibrated to show the pressure directly as altitudes, in accordance with a mathematical model defined by the International Standard Atmosphere (ISA).
		An altimeter cannot, however, be adjusted for variations in air temperature.
		Radar altimeters are also a component of terrain avoidance warning systems, telling the pilot that the aircraft is flying too low or that terrain is rising to meet the aircraft.
	www.bookrags.com /Altimeter (1235 words)

	Rough Science . New Zealand . Treasure Hunt . Altimeter \| PBS
		We can calibrate the altimeter by taking it up a known height and measuring the change in the levels of the water.
		We calibrated our Rough Science altimeter by taking it up Sentinel Point, which, according to the maps, is about 130 feet (40 meters) higher in altitude than the surroundings.
		With the board vertical and both tube ends open, carefully fill the U tube halfway with colored water (you could soak a teabag in the water for 10 minutes to make it dark brown) so that it is easy to see.
	www.pbs.org /weta/roughscience/series3/treasure/altimeter.html (1013 words)

	What is an Altimeter?
		An altimeter is a altitude measurement device used by mountaineers, skydivers, pilots, satellites, and many others.
		The altimeter’s general purpose is to tell its human or machine user how elevated from sea level it is. It performs this function via one of two ways – either by measuring the local air pressure using a barometer, or by bouncing radar off a target.
		A high precision radar altimeter works by measuring the transit time of a radio wave between a target and an airplane or satellite.
	www.wisegeek.com /what-is-an-altimeter.htm (351 words)

	The Low-Down on Altimeter Settings (Site not responding. Last check: )
		Incorrect altimeter settings are a direct cause of altitude deviations, some of them severe enough to result in near mid-air collisions and controlled flight toward terrain.
		The altimeter showed a setting on impact of 30.05; the correct setting would be about 29.22, causing the altimeter to read about 800-850 feet high.
		Altimeter was set at 29.84, and should have been set at 28.84.
	asrs.arc.nasa.gov /directline_issues/dl9_low.htm (3740 words)

	Altimeter: Free Encyclopedia Articles at Questia.com Online Library
		The radio altimeter, or terrain-clearance indicator, is an absolute altimeter; it indicates the actual altitude over water or over terrain, however uneven.
		The radio altimeter is used in the automatic landing systems of aerospace vehicles; systems developed from radio altimeters can automatically control military aircraft flying at high speeds and low altitudes.
		A satellite radar altimeter operates at microwave frequencies, effectively...via validation exercises, in which the altimeter results are correlated with ground-based...hydrological variations, gauges closest to the altimeter ground track (within a few kilometres...
	www.questia.com /library/encyclopedia/altimeter.jsp (1615 words)

	Barometric Altimeter - MB Wiki
		The altimeter will detect your change in altitude based on the change in the atmospheric pressure (the higher you go the less pressure).
		The problem with a barometric altimeter is the requirement to calibrate it every time you start your activity.
		Absolute location is provided originally by the satellite to help auto-calibrate the barometric altimeter, then the barometric altimeter is used to provide a more stable elevation change.
	wiki.motionbased.com /mb/GPS_Barometric_Altimeter (318 words)

	[No title]
		Unless specifically requested by the pilot, the altimeter setting need not be issued to local aircraft operators who have requested this omission in writing or to scheduled air carriers.
		The tower may omit the altimeter if the aircraft is sequenced or vectored to the airport by the approach control having jurisdiction at that facility.
		If the altimeter setting must be obtained by the pilot of an arriving aircraft from another source, instruct the pilot to obtain the altimeter setting from that source.
	www.faa.gov /ATPubs/ATC/Chp2/atc0207.html (628 words)

	Altimeter height residuals (Site not responding. Last check: )
		Altimeter height residuals are a means to monitor the radial orbit error, although part of the residuals are caused by the fact that the reference surface will not be a perfect representation of the actual instantaneous mean sea level.
		From analyses of the altimeter residuals it appeared that the origin of the MSS93A model is offset from the actual orbital reference frame imposed by the SLR station coordinates.
		A mean height residual of 39.3 cm is found, which is compatible with the -41.5 cm radar altimeter bias determined from the ``Venice calibration'' [Francis et al., 1993].
	www.deos.tudelft.nl /ers1/operorbs/node15.html (356 words)

	Altimeter
		Altimeters inform the pilot the altitude of the aircraft.
		The altimeter is a device that senses atmospheric pressure.
		The altimeter detects this reduction in pressure and displays the reading by mechanical or electronic means to the pilot.
	www.allstar.fiu.edu /aerojava/alt.htm (302 words)

	Dropzone Gear : Evolution Stainless Altimeter
		ALTIMETER The stainless steel version is 6.5oz and is slightly heavier then the Altimaster III at 5.8oz.
		It is notably smooth in its movement both when manually adjusting the altimeter and visually during in the plane ride up (the plane ride down as well in one case last weekend) and during the freefall.
		In short I am extremely pleased with the Evolution Altimeter I purchased and if you are in the process of looking for an altimeter I highly recommend that this is one that you should consider.
	www.dropzone.com /gear/Detailed/488.html (740 words)

	How to Buy an Altimeter - eHow.com
		An altimeter is great to have along in the outdoors: It can help you monitor your vertical progress as well as aid you in locating yourself should you get lost.
		A good altimeter will also have a stopwatch (with multiple splits), an alarm and a countdown timer.
		Altimeters are expensive - almost certainly over $100 - but add a great deal to the outdoor experience.
	www.ehow.com /how_9488_buy-altimeter.html (272 words)

	Highgear Alterra Altimeter Watch - Free Shipping! from Backcountry.com
		An altimeter with Ski Chrono function automatically calculates your total vert and speed of descent, and then saves the info so you can rub it in to your friends.
		The Alterra Altimeter Watch is a serious piece of equipment that provides the vital info you need to get the most out of an epic day in the mountains.
		Since the altimeter and barometer work together, i've found that setting the altimeter to a known altitude (http://geonames.usgs.gov/pls/gnispublic/f?p=151:1:7302452860451648895::NO:::) is a much more accurate way to calibrate this watch.
	www.backcountry.com /store/HIG0050/Highgear-Alterra-Altimeter.html?CP=Affiliate (566 words)

	Ocean Surface Topography from Space-Technology
		The dual-frequency NASA radar altimeter, NRA, is the primary instrument aboard the spacecraft.
		The CNES altimeter is a solid-state, low-power, low-mass sensor which works in much the same way as the NASA altimeter.
		The altimeter emits a radar beam that is reflected back to the antenna from the Earth's surface.
	sealevel.jpl.nasa.gov /technology/instrument-altimeter.html (264 words)

	Altimeter design
		The Radar Altimeter is a Ku-band (13.8 GHz) nadir-pointing active microwave sensor designed to measure the time return echoes from ocean and ice surfaces.
		Functioning in one of two operational modes (ocean or ice) the Radar Altimeter provides information on significant wave height; surface wind speed; sea surface elevation, which relates to ocean currents, the surface geoid and tides; and various parameters over sea ice and ice sheets.
		The Radar Altimeter antenna is shown in the figure and a block diagram illustrating the functioning of the Radar Altimeter is shown in the figure.
	earth.esa.int /rootcollection/eeo4.10075/altimeter_design.html (726 words)

	SureCheck Aviation > Avionics > Articles
		Without an internal altimeter, errors will result if squawking one of the hundreds of possible IFR or ATC codes because the transponder is sending “image altitude”;, a squawk code that happens to match up with an altitude code.
		When entering a temporary RADAR shadow, without an internal altimeter, the last received altitude would be carried into the shadow area, resulting in erroneous traffic information and potentially dangerous results.
		TrafficScope recognizes the distorted echo of the transponder signal, and the internal altimeter error correction logic determines the correct altitude.
	www.surecheck.net /avionics/altimeter.html (631 words)

	Altimeter Comparison
		Most of the altimeters available are listed here and their features compared in tabular form.
		There is a concise discussion of all the functions of the board, as well as a detailed implementation section with formulas for calculating optimal vent size, etc. There are even several illustrated examples of dual stage deployment schemes to give the newby an overview of some of the ways this is done.
		Their new P4/P5 altimeter is meant as a replacement for the Adept ALTS25, particularly in P.M.L.'s CPR (Close Proximity Recovery) system.
	www.jcrocket.com /altimeters.shtml (1707 words)

	Avionics (Site not responding. Last check: )
		Three avionics instruments are the airspeed indicator (left), the altimeter (center),and the vertical speed indicator.
		The airspeed indicator is the aircraft's "speedometer." The altimeter measures pressure and displays this as height above sea level.
		These include navigation instruments; control instruments that aid in steering and controlling the craft; power indicators such as tachometers, torquemeters, and exhaust pressure ratio indicators; and performance indicators such as altimeters, vertical velocity indicators, and velocity gauges.
	www.centennialofflight.gov /essay/Dictionary/avionics/DI50.htm (122 words)

	Altimeter
		Of the models I examined, it was the only one that specified the altimeter temperature sensitivity coefficient, i.e., +/-330 ft/18 deg F. The coefficient for my watch is less than half the specified value.
		The repeatability demonstrated on my North Dome trip (Yosemite Valley) is typical; over 9 hours and a dramatic weather change, the parking lot elevation repeated to 60'.
		It was uneventful, but only because we had a mechanical altimeter and a compass.
	home.comcast.net /~w.siegmund/Washington/20020305_Altimeter/index.html (380 words)

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