Irregular moon - Revision history

en>Double sharp: /* Exploration */

2015-01-06T08:26:39Z

Exploration

← Older revision		Revision as of 10:26, 6 January 2015
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en>JorisvS: +wl

2014-02-06T10:03:54Z

+wl

← Older revision		Revision as of 12:03, 6 February 2014
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	'''The Okumura model for Urban Areas''' is a [[Radio propagation model]] that was built using the data collected in the city of [[Tokyo]], [[Japan]]. The model is ideal for using in cities with many urban structures but not many tall blocking structures. The model served as a base for the [[Hata Model for Urban Areas\|Hata Model]].		Hello and welcome. My name is Numbers Wunder. Managing people is what I do and the salary has been truly satisfying. His family lives in South Dakota but his spouse wants them to transfer. The thing she adores most is physique developing and now she is attempting to earn cash with it.<br><br>Also visit my web-site; std testing at home, [http://riddlesandpoetry.com/?q=node/19209 visit the following web site],

	~~Okumura model was built into three modes. The ones for urban, suburban and open areas. The model for urban areas was built first~~ and ~~used as the base for others~~.

	~~==Coverage==~~

	~~Frequency = 150 MHz to 1920 MHz~~

	~~Mobile station antenna height: between 1 m and 10 m~~

	~~Base station antenna height: between 30 m and 1000 m~~

	~~Link distance: between 1 km and 100 km~~

	~~==Mathematical formulation==~~

	~~The Okumura model~~ is ~~formally expressed as:~~

	~~<math>L\;=\;L_{FSL}\;+\;A_{MU}\;-\;H_{MG}\;-\;H_{BG}\;-\;\sum{K_{correction}}\;</math>~~

	~~where,~~

	~~L = The [[median]] [[path loss]]~~. ~~Unit: [[Decibel]] (dB)~~

	~~L<sub>FSL</sub> = The [[Free-space loss\|Free Space Loss]]. Unit: [[Decibel]] (dB)~~

	~~A<sub>MU</sub> = [[Median]] [[attenuation]]. Unit: [[Decibel]] (dB)~~

	~~H<sub>MG</sub> = [[Mobile station]] [[Antenna (radio)\|antenna]] height [[gain]] factor.~~

	~~H<sub>BG</sub> = [[Base station]] [[Antenna (radio)\|antenna]] height [[gain]] factor.~~

	~~K<sub>correction</sub> = Correction factor gain (such as type of environment, water surfaces, isolated obstacle etc.)~~

	~~==Points to note==~~

	~~Okumura's model~~ is one of the most widely used models for signal prediction in urban areas. This model is applicable for frequencies in the range 150 MHz to 1920 MHz (although it is typically extrapolated up to 3000 MHz) and ~~distances of 1 km to 100 km. It can be used for base station antenna heights ranging from 30 m to 1000 m.~~

	~~Okumura developed a set of curves giving~~ the median attenuation relative to free space (Arnu), in an urban area over a quasi-smooth terrain with a base station effective antenna height ({{Not a typo\|hte}}) of 200 m and a mobile antenna height (hre) of 3 m. ~~These curves were developed from extensive measurements using vertical omni-directional antennas at both the base and mobile, and are plotted as a function of frequency~~ in ~~the range 100 MHz~~ to ~~1920 MHz and as a function of distance from the base station in the range 1 km to 100 km. To determine path~~
	loss using Okumura's model, the free space path loss between the points of interest is first determined, and then the value of Amu(f, d) (as read from the curves) is added to it along with correction factors to account for the type of terrain. The ~~model can be expressed as~~
	~~L50(dB) = LF + Amu(f, d)- G({{Not a typo\|hte}}) — G(hre) — Garea~~
	where L50 is the 50th percentile (i.e., median) value of propagation path loss, LF is the free space propagation loss, Amu is the median attenuation relative to free space, G({{Not a typo\|hte}}) is the base station antenna height gain factor, G(hre) is ~~the mobile antenna height gain factor,~~ and ~~GAREA~~ is ~~the gain due~~ to ~~the type of environment.~~
	~~Note that the antenna height gains are strictly a function of height and have nothing to do~~ with ~~antenna patterns~~.

	Plots of Amu(f, d) and GAREA for a wide range of frequencies are shown in Figure 3,23 and Figure 3.24. Furthermore, Okumura found that G({{Not a typo\|hte}}) varies at a rate of 20 dB/decade and G(hre) varies at a rate of 10 dB/decade for heights less than 3 m.
	~~G({{Not a typo\|hte}}) = 20 log({{Not a typo\|hte}}/200) 1000 m~~ > ~~{{Not a typo\|hte}} > 30 m~~
	~~G(hre) = 10 log(hre/3) hre~~ <~~= 3 m~~
	~~G(hre) = 20 log (hre/3) 10 m > hre~~ > ~~3 m~~
	Other corrections may also be applied to Okumura's model. Some of the important terrain related parameters are the terrain undulation height (A/i), isolated ridge height, average slope of the terrain and the mixed land-~~sea parameter. Once the terrain related parameters are calculated~~, ~~the necessary correction~~
	~~factors can be added or subtracted as required. All these correction factors are~~
	~~also available as Okumura curves [0ku68].~~

	~~Okumura's model is wholly based on measured data and does not provide~~
	~~any analytical explanation. For many situations, extrapolations of the derived~~
	~~curves can be made to obtain values outside the measurement range, although~~
	~~the validity of such extrapolations depends on the circumstances and the~~
	~~smoothness of the curve in question.~~

	~~Okumura's model is considered to be among the simplest and best in terms~~
	~~of accuracy in path loss prediction for mature cellular and land mobile radio systems~~
	~~in cluttered environmehts. It is very practical and has become a standard~~
	~~for system planning in modern land mobile radio systems in Japan. The major~~
	~~disadvantage with the model is its slow response to rapid changes in terrain,~~
	~~therefore the model is fairly good in urban and suburban areas, but not as good~~
	~~in rural areas. Common standard deviations between predicted and measured~~
	~~path loss values are around 10 dB to 14 dB.~~

	~~==Further reading==~~

	* Introduction to RF propagation, John S. Seybold, 2005, Wiley.

	~~==See also==~~

	*[[Hata Model for Urban Areas]]
	*[[Hata Model for Suburban Areas]]
	*[[Hata Model for Open Areas]]
	*[[Young Model]]

	~~==External links==~~
	*[http://~~www.siradel~~.com ~~VOLCANO advanced radio propagation model] including both direct-path and multi-path ([[Ray tracing (physics)\|ray-tracing]]) models~~

	~~[[Category:Radio frequency propagation]~~]

en>SuperJew: Disambiguated: orbital plane → orbital plane (astronomy)

2013-11-17T21:08:23Z

Disambiguated: orbital plane → orbital plane (astronomy)

← Older revision		Revision as of 23:08, 17 November 2013
Line 1:		Line 1:
	~~Greetings! I am Marvella~~ and ~~I really feel comfy when individuals use~~ the ~~full name~~. ~~Body building~~ is one of the ~~issues I adore~~ most. ~~I utilized~~ to be ~~unemployed but now I am~~ a ~~librarian~~ and the ~~wage has been truly satisfying~~. ~~Years in~~ the ~~past we moved~~ to ~~North Dakota~~.<br>~~<br~~>~~my web site ::~~ [http://~~ironptstudio~~.com~~/rev/239375 std testing at home~~]		'''The Okumura model for Urban Areas''' is a [[Radio propagation model]] that was built using the data collected in the city of [[Tokyo]], [[Japan]]. The model is ideal for using in cities with many urban structures but not many tall blocking structures. The model served as a base for the [[Hata Model for Urban Areas\|Hata Model]].

			Okumura model was built into three modes. The ones for urban, suburban and open areas. The model for urban areas was built first and used as the base for others.

			==Coverage==

			Frequency = 150 MHz to 1920 MHz

			Mobile station antenna height: between 1 m and 10 m

			Base station antenna height: between 30 m and 1000 m

			Link distance: between 1 km and 100 km

			==Mathematical formulation==

			The Okumura model is formally expressed as:

			<math>L\;=\;L_{FSL}\;+\;A_{MU}\;-\;H_{MG}\;-\;H_{BG}\;-\;\sum{K_{correction}}\;</math>

			where,

			L = The [[median]] [[path loss]]. Unit: [[Decibel]] (dB)

			L<sub>FSL</sub> = The [[Free-space loss\|Free Space Loss]]. Unit: [[Decibel]] (dB)

			A<sub>MU</sub> = [[Median]] [[attenuation]]. Unit: [[Decibel]] (dB)

			H<sub>MG</sub> = [[Mobile station]] [[Antenna (radio)\|antenna]] height [[gain]] factor.

			H<sub>BG</sub> = [[Base station]] [[Antenna (radio)\|antenna]] height [[gain]] factor.

			K<sub>correction</sub> = Correction factor gain (such as type of environment, water surfaces, isolated obstacle etc.)

			==Points to note==

			Okumura's model is one of the most widely used models for signal prediction in urban areas. This model is applicable for frequencies in the range 150 MHz to 1920 MHz (although it is typically extrapolated up to 3000 MHz) and distances of 1 km to 100 km. It can be used for base station antenna heights ranging from 30 m to 1000 m.

			Okumura developed a set of curves giving the median attenuation relative to free space (Arnu), in an urban area over a quasi-smooth terrain with a base station effective antenna height ({{Not a typo\|hte}}) of 200 m and a mobile antenna height (hre) of 3 m. These curves were developed from extensive measurements using vertical omni-directional antennas at both the base and mobile, and are plotted as a function of frequency in the range 100 MHz to 1920 MHz and as a function of distance from the base station in the range 1 km to 100 km. To determine path
			loss using Okumura's model, the free space path loss between the points of interest is first determined, and then the value of Amu(f, d) (as read from the curves) is added to it along with correction factors to account for the type of terrain. The model can be expressed as
			L50(dB) = LF + Amu(f, d)- G({{Not a typo\|hte}}) — G(hre) — Garea
			where L50 is the 50th percentile (i.e., median) value of propagation path loss, LF is the free space propagation loss, Amu is the median attenuation relative to free space, G({{Not a typo\|hte}}) is the base station antenna height gain factor, G(hre) is the mobile antenna height gain factor, and GAREA is the gain due to the type of environment.
			Note that the antenna height gains are strictly a function of height and have nothing to do with antenna patterns.

			Plots of Amu(f, d) and GAREA for a wide range of frequencies are shown in Figure 3,23 and Figure 3.24. Furthermore, Okumura found that G({{Not a typo\|hte}}) varies at a rate of 20 dB/decade and G(hre) varies at a rate of 10 dB/decade for heights less than 3 m.
			G({{Not a typo\|hte}}) = 20 log({{Not a typo\|hte}}/200) 1000 m > {{Not a typo\|hte}} > 30 m
			G(hre) = 10 log(hre/3) hre <= 3 m
			G(hre) = 20 log (hre/3) 10 m > hre > 3 m
			Other corrections may also be applied to Okumura's model. Some of the important terrain related parameters are the terrain undulation height (A/i), isolated ridge height, average slope of the terrain and the mixed land-sea parameter. Once the terrain related parameters are calculated, the necessary correction
			factors can be added or subtracted as required. All these correction factors are
			also available as Okumura curves [0ku68].

			Okumura's model is wholly based on measured data and does not provide
			any analytical explanation. For many situations, extrapolations of the derived
			curves can be made to obtain values outside the measurement range, although
			the validity of such extrapolations depends on the circumstances and the
			smoothness of the curve in question.

			Okumura's model is considered to be among the simplest and best in terms
			of accuracy in path loss prediction for mature cellular and land mobile radio systems
			in cluttered environmehts. It is very practical and has become a standard
			for system planning in modern land mobile radio systems in Japan. The major
			disadvantage with the model is its slow response to rapid changes in terrain,
			therefore the model is fairly good in urban and suburban areas, but not as good
			in rural areas. Common standard deviations between predicted and measured
			path loss values are around 10 dB to 14 dB.

			==Further reading==

			* Introduction to RF propagation, John S. Seybold, 2005, Wiley.

			==See also==

			*[[Hata Model for Urban Areas]]
			*[[Hata Model for Suburban Areas]]
			*[[Hata Model for Open Areas]]
			*[[Young Model]]

			==External links==
			*[http://www.siradel.com VOLCANO advanced radio propagation model] including both direct-path and multi-path ([[Ray tracing (physics)\|ray-tracing]]) models

			[[Category:Radio frequency propagation]]

en>Teapeat: /* External links */ it's about the orbit, add to cat orbits

2012-06-25T14:31:47Z

External links: it's about the orbit, add to cat orbits

New page

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