Indexed language - Revision history

en>Jochen Burghardt: /* top */ they are sets, since contained in the Kleene star; MCSL is a class of language classes, LIG is a member of it, not a subset

2014-08-17T13:24:40Z

top: they are sets, since contained in the Kleene star; MCSL is a class of language classes, LIG is a member of it, not a subset

← Older revision		Revision as of 15:24, 17 August 2014
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	~~Oscar~~ is ~~what my spouse enjoys~~ to ~~call me and I totally dig that title~~. ~~Puerto Rico~~ is ~~exactly where he~~'s been ~~residing~~ for ~~many years and he will by no means move. I used to be unemployed but now I am a librarian and the salary has been truly satisfying. To do aerobics is~~ a ~~thing that I'm completely addicted to~~.<br><br>~~Feel free to~~ visit my ~~site ::~~ [http://www.~~gaysphere~~.~~net~~/~~user~~/~~Z5147 home std test kit~~]		Hi there. Let me start by introducing the author, her name is Sophia. Credit authorising is how she tends to make a residing. Her family members life in Ohio. As a woman what she truly likes is fashion and she's been doing it for quite a whilst.<br><br>Also visit my page - tarot card readings ([http://www.khuplaza.com/dent/14869889 simply click the following site])

en>Jochen Burghardt: moved ref.s to central ((cite doi)) template pages, where possible

2014-02-15T17:31:20Z

moved ref.s to central ((cite doi)) template pages, where possible

← Older revision		Revision as of 19:31, 15 February 2014
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	~~'''Phase-comparison monopulse''' (also called phase-interferometry) describes a technique~~ that can be used in [[radar]] and [[direction finding]] applications to accurately estimate the direction of arrival of a signal from the phase difference of the signal measured on two (or more) separated antennas.		Oscar is what my spouse enjoys to call me and I totally dig that title. Puerto Rico is exactly where he's been residing for many years and he will by no means move. I used to be unemployed but now I am a librarian and the salary has been truly satisfying. To do aerobics is a thing that I'm completely addicted to.<br><br>Feel free to visit my site :: [http://www.gaysphere.net/user/Z5147 home std test kit]
	~~<ref Name="Mahafza">{{cite book \|~~title~~= Introduction to radar analysis; Electrical Engineering Radar Signal Processing \|last= Mahafza \|first= Bassem R~~. \|authorlink= Bassem R. Mahafza \|year= 1998 \|publisher= CRC Press \|isbn= 0-8493-1879-3 \|page= 251 \|url= http://books.google.com/books?id=HnbERplIrX0C&pg=PA251&dq=Phase-Comparison+Monopulse&hl=en&ei=jfeZTda7NaiR0QHX7qz7Cw&sa=X&oi=book_result&ct=result&resnum=2&ved=0CC0Q6AEwAQ#v=onepage&q=Phase-Comparison%20Monopulse&f=false}}</ref>
	~~==Mathematics==~~
	~~{{Unreferenced section\|date=April 2011}}~~
	~~Assume two antenna separated by a distance~~ '~~'d'', with a wavefront incident at an angle θ, then the extra path the signal must travel between Antenna 1~~ and ~~Antenna 2 (see figure) results in a phase difference, ΔΦ, between the two antennas~~. ~~This can be~~ used to ~~calculate the direction of arrival using:~~
	~~:<math> \theta = \sin^{-1} \left( \frac{\lambda\ \Delta \Phi}{2 \pi d} \right) </math>~~
	~~where λ is the signal's wavelength.~~

	~~For unambiguous results, the antennas should~~ be ~~spaced half~~ a ~~wavelength apart, or less. However, this can result in significant mutual coupling between elements, which means that each antenna's phase measurement will be corrupted by~~ the ~~other's~~. ~~The approach assumes~~ that the phase centres of the antennas are exactly known. With more complex antenna structures (such as the [[log-periodic antenna]]) the effects of mutual coupling can make the phase centre locations unknown. In this case, calibration or [[electromagnetic modeling]] may be required.

	~~The ability to accurately measure a signal~~'~~s phase depends on the [[signal-~~to~~-noise ratio]] (SNR), and hence the accuracy of this technique is dependent on the SNR~~.

	~~[[File~~:~~PhaseInterferometry.png\|frame\|Principle of phase interferometry]]~~

	~~==See also==~~
	* [[Very-long-baseline interferometry]]
	* [[Amplitude-comparison monopulse]]

	~~==References==~~
	~~{{reflist}}~~

	~~[[Category~~:~~Interferometry]]~~
	[~~[Category~~:~~Radar]~~]

en>Jochen Burghardt: /* Properties */ fixed url again ("url=arXiv:math/9509205" didn't render a link)

2014-02-03T14:13:45Z

Properties: fixed url again ("url=arXiv:math/9509205" didn't render a link)

← Older revision		Revision as of 16:13, 3 February 2014
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	~~Hi there~~. ~~Allow me begin by introducing the author, her~~ title ~~is Sophia~~. ~~To perform lacross is 1 of the things she enjoys most~~. ~~Office supervising is my occupation~~. ~~Ohio is where his home is~~ and ~~his family enjoys it~~.<br><br>~~Here~~ is ~~my blog post~~ [~~http://si~~.~~dgmensa~~.~~org/xe/index~~.~~php?document_srl~~=~~48014&mid~~=~~c0102 good psychic~~]		'''Phase-comparison monopulse''' (also called phase-interferometry) describes a technique that can be used in [[radar]] and [[direction finding]] applications to accurately estimate the direction of arrival of a signal from the phase difference of the signal measured on two (or more) separated antennas.
			<ref Name="Mahafza">{{cite book \|title= Introduction to radar analysis; Electrical Engineering Radar Signal Processing \|last= Mahafza \|first= Bassem R. \|authorlink= Bassem R. Mahafza \|year= 1998 \|publisher= CRC Press \|isbn= 0-8493-1879-3 \|page= 251 \|url= http://books.google.com/books?id=HnbERplIrX0C&pg=PA251&dq=Phase-Comparison+Monopulse&hl=en&ei=jfeZTda7NaiR0QHX7qz7Cw&sa=X&oi=book_result&ct=result&resnum=2&ved=0CC0Q6AEwAQ#v=onepage&q=Phase-Comparison%20Monopulse&f=false}}</ref>
			==Mathematics==
			{{Unreferenced section\|date=April 2011}}
			Assume two antenna separated by a distance ''d'', with a wavefront incident at an angle θ, then the extra path the signal must travel between Antenna 1 and Antenna 2 (see figure) results in a phase difference, ΔΦ, between the two antennas. This can be used to calculate the direction of arrival using:
			:<math> \theta = \sin^{-1} \left( \frac{\lambda\ \Delta \Phi}{2 \pi d} \right) </math>
			where λ is the signal's wavelength.

			For unambiguous results, the antennas should be spaced half a wavelength apart, or less. However, this can result in significant mutual coupling between elements, which means that each antenna's phase measurement will be corrupted by the other's. The approach assumes that the phase centres of the antennas are exactly known. With more complex antenna structures (such as the [[log-periodic antenna]]) the effects of mutual coupling can make the phase centre locations unknown. In this case, calibration or [[electromagnetic modeling]] may be required.

			The ability to accurately measure a signal's phase depends on the [[signal-to-noise ratio]] (SNR), and hence the accuracy of this technique is dependent on the SNR.

			[[File:PhaseInterferometry.png\|frame\|Principle of phase interferometry]]

			==See also==
			* [[Very-long-baseline interferometry]]
			* [[Amplitude-comparison monopulse]]

			==References==
			{{reflist}}

			[[Category:Interferometry]]
			[[Category:Radar]]

en>Helpful Pixie Bot: ISBNs (Build KC)

2012-05-05T23:33:08Z

ISBNs (Build KC)

New page

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