GNSS Performances - Revision history

Claudia.Prajanu at 08:49, 26 July 2018

2018-07-26T08:49:22Z

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	The performance parameters described above measure the performance of the GNSS system. These performance parameters can be used in different ways, with different purposes and in different conditions.		The performance parameters described above measure the performance of the GNSS system. These performance parameters can be used in different ways, with different purposes and in different conditions.

	One of the uses of the GNSS Performance Parameters is to define requirements that a GNSS System should have in specific conditions. All GNSS systems had such requirements during the specification phase of the development of the system. These requirements are one of the drivers of the system design and development. During the operational phase these requirements are kept and sometimes updated as operational requirements against which actual performance will be verified. Such [[GALILEO Performances\|performance]] requirements for [[~~GALILEO~~\|Galileo]] can be found in the ~~[http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf~~ Galileo Mission High Level Definition] coming from the Galileo System Requirement Document<ref> ~~[http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf~~ Galileo Mission High Level Definition], v3, September 2002.</ref><ref> Galileo System Requirement Document, ESA-APPNS-REQ-00011, issue 3.0, June 20 2003</ref>. The GPS Performance requirements can be found in the [http://www.gps.gov/technical/ps/ GPS Performance Requirements Documents]<ref> [http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf GPS Standard Positioning Service (SPS) Performance Standard], 4<sup>th</sup> Edition, September 2008.</ref><ref> [http://www.gps.gov/technical/ps/2007-PPS-performance-standard.pdf GPS Precision Positioning Service (PPS) Performance Standard], 1<sup>st</sup> Edition, February 2007.</ref>.		One of the uses of the GNSS Performance Parameters is to define requirements that a GNSS System should have in specific conditions. All GNSS systems had such requirements during the specification phase of the development of the system. These requirements are one of the drivers of the system design and development. During the operational phase these requirements are kept and sometimes updated as operational requirements against which actual performance will be verified. Such [[GALILEO Performances\|performance]] requirements for [[Galileo General Introduction\|Galileo]] can be found in the Galileo Mission High Level Definition coming from the Galileo System Requirement Document<ref> Galileo Mission High Level Definition, v3, September 2002.</ref><ref> Galileo System Requirement Document, ESA-APPNS-REQ-00011, issue 3.0, June 20 2003</ref>. The GPS Performance requirements can be found in the [http://www.gps.gov/technical/ps/ GPS Performance Requirements Documents]<ref> [http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf GPS Standard Positioning Service (SPS) Performance Standard], 4<sup>th</sup> Edition, September 2008.</ref><ref> [http://www.gps.gov/technical/ps/2007-PPS-performance-standard.pdf GPS Precision Positioning Service (PPS) Performance Standard], 1<sup>st</sup> Edition, February 2007.</ref>.

	These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.		These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.

Filipe.Pelica: Included editor logo.

2014-09-18T16:34:52Z

Included editor logo.

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	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
			\|Logo=GMV
	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	}}		}}

Filipe.Pelica: fixed broken link

2014-05-29T13:47:27Z

fixed broken link

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	The performance parameters described above measure the performance of the GNSS system. These performance parameters can be used in different ways, with different purposes and in different conditions.		The performance parameters described above measure the performance of the GNSS system. These performance parameters can be used in different ways, with different purposes and in different conditions.

	One of the uses of the GNSS Performance Parameters is to define requirements that a GNSS System should have in specific conditions. All GNSS systems had such requirements during the specification phase of the development of the system. These requirements are one of the drivers of the system design and development. During the operational phase these requirements are kept and sometimes updated as operational requirements against which actual performance will be verified. Such [[GALILEO Performances\|performance]] requirements for [[GALILEO\|Galileo]] can be found in the [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition] coming from the Galileo System Requirement Document<ref> [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition], v3, September 2002.</ref><ref> Galileo System Requirement Document, ESA-APPNS-REQ-00011, issue 3.0, June 20 2003</ref>. The GPS Performance requirements can be found in the [http://www.gps.gov/technical/ps/ GPS Performance Requirements Documents]<ref> [http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf GPS Standard Positioning Service (SPS) Performance Standard], 4<sup>th</sup> Edition, September 2008.</ref><ref> [http://www.~~pnt~~.gov/~~public~~/~~docs~~/2007~~/ppsps2007~~.pdf GPS Precision Positioning Service (PPS) Performance Standard], 1<sup>st</sup> Edition, February 2007.</ref>.		One of the uses of the GNSS Performance Parameters is to define requirements that a GNSS System should have in specific conditions. All GNSS systems had such requirements during the specification phase of the development of the system. These requirements are one of the drivers of the system design and development. During the operational phase these requirements are kept and sometimes updated as operational requirements against which actual performance will be verified. Such [[GALILEO Performances\|performance]] requirements for [[GALILEO\|Galileo]] can be found in the [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition] coming from the Galileo System Requirement Document<ref> [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition], v3, September 2002.</ref><ref> Galileo System Requirement Document, ESA-APPNS-REQ-00011, issue 3.0, June 20 2003</ref>. The GPS Performance requirements can be found in the [http://www.gps.gov/technical/ps/ GPS Performance Requirements Documents]<ref> [http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf GPS Standard Positioning Service (SPS) Performance Standard], 4<sup>th</sup> Edition, September 2008.</ref><ref> [http://www.gps.gov/technical/ps/2007-PPS-performance-standard.pdf GPS Precision Positioning Service (PPS) Performance Standard], 1<sup>st</sup> Edition, February 2007.</ref>.

	These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.		These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.

Filipe.Pelica: fixed broken link

2014-05-29T11:04:43Z

fixed broken link

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	The performance parameters described above measure the performance of the GNSS system. These performance parameters can be used in different ways, with different purposes and in different conditions.		The performance parameters described above measure the performance of the GNSS system. These performance parameters can be used in different ways, with different purposes and in different conditions.

	One of the uses of the GNSS Performance Parameters is to define requirements that a GNSS System should have in specific conditions. All GNSS systems had such requirements during the specification phase of the development of the system. These requirements are one of the drivers of the system design and development. During the operational phase these requirements are kept and sometimes updated as operational requirements against which actual performance will be verified. Such [[GALILEO Performances\|performance]] requirements for [[GALILEO\|Galileo]] can be found in the [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition] coming from the Galileo System Requirement Document<ref> [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition], v3, September 2002.</ref><ref> Galileo System Requirement Document, ESA-APPNS-REQ-00011, issue 3.0, June 20 2003</ref>. The GPS Performance requirements can be found in the [http://www.gps.gov/technical/ps/ GPS Performance Requirements Documents]<ref> [http://www.~~pnt~~.gov/~~public~~/~~docs~~/2008~~/spsps2008~~.pdf GPS Standard Positioning Service (SPS) Performance Standard], 4<sup>th</sup> Edition, September 2008.</ref><ref> [http://www.pnt.gov/public/docs/2007/ppsps2007.pdf GPS Precision Positioning Service (PPS) Performance Standard], 1<sup>st</sup> Edition, February 2007.</ref>.		One of the uses of the GNSS Performance Parameters is to define requirements that a GNSS System should have in specific conditions. All GNSS systems had such requirements during the specification phase of the development of the system. These requirements are one of the drivers of the system design and development. During the operational phase these requirements are kept and sometimes updated as operational requirements against which actual performance will be verified. Such [[GALILEO Performances\|performance]] requirements for [[GALILEO\|Galileo]] can be found in the [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition] coming from the Galileo System Requirement Document<ref> [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition], v3, September 2002.</ref><ref> Galileo System Requirement Document, ESA-APPNS-REQ-00011, issue 3.0, June 20 2003</ref>. The GPS Performance requirements can be found in the [http://www.gps.gov/technical/ps/ GPS Performance Requirements Documents]<ref> [http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf GPS Standard Positioning Service (SPS) Performance Standard], 4<sup>th</sup> Edition, September 2008.</ref><ref> [http://www.pnt.gov/public/docs/2007/ppsps2007.pdf GPS Precision Positioning Service (PPS) Performance Standard], 1<sup>st</sup> Edition, February 2007.</ref>.

	These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.		These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.

Teresa.Ferreira: /* Performance Parameters */

2013-01-04T17:10:08Z

Performance Parameters

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	:'''[[Integrity]]:''' Integrity is the measure of the trust that can be placed in the correctness of the information supplied by a navigation system. Integrity includes the ability of the system to provide timely warnings to users when the system should not be used for navigation.		:'''[[Integrity]]:''' Integrity is the measure of the trust that can be placed in the correctness of the information supplied by a navigation system. Integrity includes the ability of the system to provide timely warnings to users when the system should not be used for navigation.


			Furthermore, an additional performance indicator, the Time To First Fix ([[TTFF]]), is also used by some receiver manufacturers. The TTFF is a measure of performance of a GNSS receiver that accounts for the time elapsed from the GNSS receiver switch-on until the output of a navigation solution within a certain performance (e.g. in terms of [[Accuracy\|accuracy]]).

	==Uses of GNSS Performance Parameters==		==Uses of GNSS Performance Parameters==

Carlos.Lopez at 11:33, 23 February 2012

2012-02-23T11:33:12Z

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	{{Article Infobox2		{{Article Infobox2
	\|Category=Fundamentals		\|Category=Fundamentals
	\|~~Title={{PAGENAME}}~~		\|Editors=GMV
	~~\|Authors~~=GMV
	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
	\|~~Logo~~=~~GMV~~		\|Title={{PAGENAME}}
	}}		}}

	Performance of a navigation system is most usually measured in terms of the solution error ([[Accuracy\|accuracy]]) and of the portion of the time it can be used for the intended application ([[Availability\|availability]]). However, other performance parameters can become important for some [[GNSS Applications\|applications]]. For instance, when a navigation system is used for air or maritime navigation, an unwarned large solution error can seriously increase the risk of an accident, possibly causing damage of goods, injuries to people or even death. Such errors can occur without violating the [[Accuracy\|accuracy]] specification, and this is why the civil aviation community has defined the concept of [[Integrity\|integrity]] as a measure of the probability that such hazardous situations can take place. Also, since some flight phases (such as approach and landing) are of special criticality, it is important that the navigation system remains available without interruptions during such periods although actually all flight phases have certain needs at this respect. That is why the civil aviation community has defined a fourth performance parameter called [[Continuity\|continuity]].		Performance of a navigation system is most usually measured in terms of the solution error ([[Accuracy\|accuracy]]) and of the portion of the time it can be used for the intended application ([[Availability\|availability]]). However, other performance parameters can become important for some [[GNSS Applications\|applications]]. For instance, when a navigation system is used for air or maritime navigation, an unwarned large solution error can seriously increase the risk of an accident, possibly causing damage of goods, injuries to people or even death. Such errors can occur without violating the [[Accuracy\|accuracy]] specification, and this is why the civil aviation community has defined the concept of [[Integrity\|integrity]] as a measure of the probability that such hazardous situations can take place. Also, since some flight phases (such as approach and landing) are of special criticality, it is important that the navigation system remains available without interruptions during such periods although actually all flight phases have certain needs at this respect. That is why the civil aviation community has defined a fourth performance parameter called [[Continuity\|continuity]].

Rui.Pereira at 13:18, 30 June 2011

2011-06-30T13:18:49Z

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	These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.		These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.

	In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS ~~Perfomances~~\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.		In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS Performances\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.

	The increase in performance given by space-based augmentations systems ([[EGNOS Performances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentation\|GNSS Augmentations]] is measured also using these parameters.		The increase in performance given by space-based augmentations systems ([[EGNOS Performances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentation\|GNSS Augmentations]] is measured also using these parameters.

Rui.Pereira at 14:27, 29 June 2011

2011-06-29T14:27:21Z

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	The four parameters used to ~~caraterize~~ GNSS performance are based on the [[Wikipedia:Required navigation performance\|RNP]] specification are summarized hereafter{{#tag:ref\| These definitions were adapted from the [http://www.navcen.uscg.gov/pdf/2008_Federal_Radionavigation_Plan.pdf 2008 US Federal Radionavigation Plan]<ref> [http://www.navcen.uscg.gov/pdf/2008_Federal_Radionavigation_Plan.pdf US Federal Radionavigation Plan], DOT-VNTSC-RITA-08-02/DoD-4650.5, 2008</ref>\|group="nb"}}:		The four parameters used to characterize GNSS performance are based on the [[Wikipedia:Required navigation performance\|RNP]] specification are summarized hereafter{{#tag:ref\| These definitions were adapted from the [http://www.navcen.uscg.gov/pdf/2008_Federal_Radionavigation_Plan.pdf 2008 US Federal Radionavigation Plan]<ref> [http://www.navcen.uscg.gov/pdf/2008_Federal_Radionavigation_Plan.pdf US Federal Radionavigation Plan], DOT-VNTSC-RITA-08-02/DoD-4650.5, 2008</ref>\|group="nb"}}:

	:'''[[Accuracy]]:''' The accuracy of an estimated or measured position of a craft (vehicle, aircraft, or vessel) at a given time is the degree of conformance of that position with the true position, velocity and/or time of the craft. Since accuracy is a statistical measure of performance, a statement of navigation system accuracy is meaningless unless it includes a statement of the uncertainty in position that applies.		:'''[[Accuracy]]:''' The accuracy of an estimated or measured position of a craft (vehicle, aircraft, or vessel) at a given time is the degree of conformance of that position with the true position, velocity and/or time of the craft. Since accuracy is a statistical measure of performance, a statement of navigation system accuracy is meaningless unless it includes a statement of the uncertainty in position that applies.
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	These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.		These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.

	In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS ~~Perfomance~~\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.		In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS Perfomances\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.

	The increase in performance given by space-based augmentations systems ([[EGNOS Performances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentation\|GNSS Augmentations]] is measured also using these parameters.		The increase in performance given by space-based augmentations systems ([[EGNOS Performances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentation\|GNSS Augmentations]] is measured also using these parameters.

Rui.Pereira: /* Uses of GNSS Performance Parameters */

2011-05-06T09:07:05Z

Uses of GNSS Performance Parameters

← Older revision		Revision as of 09:07, 6 May 2011
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	In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS Perfomance\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.		In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS Perfomance\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.

	The increase in performance given by space-based augmentations systems ([[EGNOS ~~Perfomances~~\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentations]] is measured also using these parameters.		The increase in performance given by space-based augmentations systems ([[EGNOS Performances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentation\|GNSS Augmentations]] is measured also using these parameters.

	Besides being used to evaluate the performance of the GNSS systems and its augmentation systems and technologies these performance parameters are used to measure the performance of the receivers that use these systems. This performance evaluation can be made for generic conditions (such as open sky locations) or for the evaluation of the receiver on specific conditions since the receiver performance can be influenced by local factors such as:		Besides being used to evaluate the performance of the GNSS systems and its augmentation systems and technologies these performance parameters are used to measure the performance of the receivers that use these systems. This performance evaluation can be made for generic conditions (such as open sky locations) or for the evaluation of the receiver on specific conditions since the receiver performance can be influenced by local factors such as:

Rui.Pereira at 09:50, 31 March 2011

2011-03-31T09:50:23Z

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	The four parameters used to caraterize GNSS performance are based on the [[Wikipedia:Required navigation performance\|RNP]] specification are summarized hereafter{{#tag:ref\| These definitions were adapted from the [http://www.navcen.uscg.gov/pdf/2008_Federal_Radionavigation_Plan.pdf 2008 US Federal Radionavigation Plan]<ref> [http://www.navcen.uscg.gov/pdf/2008_Federal_Radionavigation_Plan.pdf Federal Radionavigation Plan], DOT-VNTSC-RITA-08-02/DoD-4650.5, 2008</ref>\|group="nb"}}:		The four parameters used to caraterize GNSS performance are based on the [[Wikipedia:Required navigation performance\|RNP]] specification are summarized hereafter{{#tag:ref\| These definitions were adapted from the [http://www.navcen.uscg.gov/pdf/2008_Federal_Radionavigation_Plan.pdf 2008 US Federal Radionavigation Plan]<ref> [http://www.navcen.uscg.gov/pdf/2008_Federal_Radionavigation_Plan.pdf US Federal Radionavigation Plan], DOT-VNTSC-RITA-08-02/DoD-4650.5, 2008</ref>\|group="nb"}}:

	:'''[[Accuracy]]:''' The accuracy of an estimated or measured position of a craft (vehicle, aircraft, or vessel) at a given time is the degree of conformance of that position with the true position, velocity and/or time of the craft. Since accuracy is a statistical measure of performance, a statement of navigation system		:'''[[Accuracy]]:''' The accuracy of an estimated or measured position of a craft (vehicle, aircraft, or vessel) at a given time is the degree of conformance of that position with the true position, velocity and/or time of the craft. Since accuracy is a statistical measure of performance, a statement of navigation system accuracy is meaningless unless it includes a statement of the uncertainty in position that applies.
	accuracy is meaningless unless it includes a statement of the uncertainty in position that applies.

	:'''[[Availability]]:''' The availability of a navigation system is the percentage of time that the services of the system are usable by the navigator. Availability is an indication of the ability of the system to provide usable service within the specified coverage area. Signal availability is the percentage of time that navigation signals transmitted from external sources are available for use. It is a function of both the physical characteristics of the environment and the technical capabilities of the transmitter facilities.		:'''[[Availability]]:''' The availability of a navigation system is the percentage of time that the services of the system are usable by the navigator. Availability is an indication of the ability of the system to provide usable service within the specified coverage area. Signal availability is the percentage of time that navigation signals transmitted from external sources are available for use. It is a function of both the physical characteristics of the environment and the technical capabilities of the transmitter facilities.
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	The performance parameters described above measure the performance of the GNSS system. These performance parameters can be used in different ways, with different purposes and in different conditions.		The performance parameters described above measure the performance of the GNSS system. These performance parameters can be used in different ways, with different purposes and in different conditions.

	One of the uses ~~for~~ the GNSS Performance Parameters is to define requirements that ~~and~~ GNSS System should have in specific conditions. All GNSS systems had such requirements during the specification phase of the development of the system. These requirements are one of the drivers of the system design and development. During the operational phase these requirements are kept and sometimes updated as operational requirements against which actual performance will be verified. Such [[GALILEO Performances\|performance]] requirements for [[GALILEO\|Galileo]] can be found in the [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition] coming from the Galileo System Requirement Document<ref> [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition], v3, September 2002.</ref><ref> Galileo System Requirement Document, ESA-APPNS-REQ-00011, issue 3.0, June 20 2003</ref>. The GPS Performance requirements can be found in the [http://www.gps.gov/technical/ps/ GPS Performance Requirements Documents]<ref> [http://www.pnt.gov/public/docs/2008/spsps2008.pdf GPS Standard Positioning Service (SPS) Performance Standard], 4<sup>th</sup> Edition, September 2008.</ref><ref> [http://www.pnt.gov/public/docs/2007/ppsps2007.pdf GPS Precision Positioning Service (PPS) Performance Standard], 1<sup>st</sup> Edition, February 2007.</ref>.		One of the uses of the GNSS Performance Parameters is to define requirements that a GNSS System should have in specific conditions. All GNSS systems had such requirements during the specification phase of the development of the system. These requirements are one of the drivers of the system design and development. During the operational phase these requirements are kept and sometimes updated as operational requirements against which actual performance will be verified. Such [[GALILEO Performances\|performance]] requirements for [[GALILEO\|Galileo]] can be found in the [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition] coming from the Galileo System Requirement Document<ref> [http://ec.europa.eu/dgs/energy_transport/galileo/doc/galileo_hld_v3_23_09_02.pdf Galileo Mission High Level Definition], v3, September 2002.</ref><ref> Galileo System Requirement Document, ESA-APPNS-REQ-00011, issue 3.0, June 20 2003</ref>. The GPS Performance requirements can be found in the [http://www.gps.gov/technical/ps/ GPS Performance Requirements Documents]<ref> [http://www.pnt.gov/public/docs/2008/spsps2008.pdf GPS Standard Positioning Service (SPS) Performance Standard], 4<sup>th</sup> Edition, September 2008.</ref><ref> [http://www.pnt.gov/public/docs/2007/ppsps2007.pdf GPS Precision Positioning Service (PPS) Performance Standard], 1<sup>st</sup> Edition, February 2007.</ref>.

	~~In a similar way this kind of~~ performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.		These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.

	In the same way that these parameters are used for the definition of requirements of a GNSS system they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS Perfomance\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation ~~Adminstration~~]] in its GPS Performance Analysis Reports><ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.		In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS Perfomance\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.

	In the same way that space-based GNSS Systems ([[GALILEO Perfomances\|GALILEO]], [[GPS Performances\|GPS]], [[GLONASS Performances\|GLONASS]], [[COMPASS Performances\|COMPASS]]) are evaluated in terms of performance using these parameters also the increase in performance given by space-based augmentations systems ([[EGNOS Perfomances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentations]] ~~are~~ measured using these parameters.		The increase in performance given by space-based augmentations systems ([[EGNOS Perfomances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentations]] is measured also using these parameters.

	Besides being used to evaluate the performance of the GNSS systems and its augmentation systems and technologies these performance parameters are used to measure the performance of the receivers that use these systems. This performance evaluation can be made for generic conditions (such as open sky locations) or for the evaluation of the receiver on specific conditions since the receiver performance can be influenced by local factors such as:		Besides being used to evaluate the performance of the GNSS systems and its augmentation systems and technologies these performance parameters are used to measure the performance of the receivers that use these systems. This performance evaluation can be made for generic conditions (such as open sky locations) or for the evaluation of the receiver on specific conditions since the receiver performance can be influenced by local factors such as:

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	These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.		These performance requirements can be used also to define the performance that an [[GNSS Applications\|application]] will need from a GNSS system in order to be able to perform its functionality adequately.

	In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS ~~Perfomances~~\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.		In the same way that these parameters are used for the definition of requirements of a GNSS system, they are use to evaluate its actual performance under typical and well defined conditions. The actual [[GPS Performances\|performance of GPS]] is monitored by several entities such as the [[Wikipedia:Federal Aviation Administration\|US Federal Aviation Administration]] in its GPS Performance Analysis Reports<ref> [http://www.nstb.tc.faa.gov/reports/PAN72_0111.pdf FAA Global Positioning System (GPS) Standard Positioning Service (SPS) Performance Analysis Report], Report 72, January 2011.</ref>.

	The increase in performance given by space-based augmentations systems ([[EGNOS Performances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentation\|GNSS Augmentations]] is measured also using these parameters.		The increase in performance given by space-based augmentations systems ([[EGNOS Performances\|EGNOS]], [[WAAS Performances\|WAAS]], [[MSAS Performances\|MSAS]]) and of other [[GNSS Augmentation\|GNSS Augmentations]] is measured also using these parameters.