GPS Performances - Revision history

Gema.Cueto: Updated reference ICD/SDD links

2026-04-17T12:19:21Z

Updated reference ICD/SDD links

← Older revision		Revision as of 12:19, 17 April 2026
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	GPS supplies two different service levels, Standard Positioning Service and the Precise Positioning Service:		GPS supplies two different service levels, Standard Positioning Service and the Precise Positioning Service:
	# The Standard Positioning Service (SPS),<ref name="SPS-Standard ">[https://~~www~~.gps.gov/technical/ps/2020-SPS-performance-standard.pdf Global Positioning System Standard Positioning Service Performance Standard]</ref> is a positioning and timing service provided on GPS L1, L2 and L5 frequencies and available to all GPS users. The L1 frequency contains a coarse acquisition (C/A) code and a navigation data message. The L2 frequency contains a CM-code and CL-code signals whereas I5-code and Q5-code signals are transmitted in L5 frequency.		# The Standard Positioning Service (SPS),<ref name="SPS-Standard ">[https://archive.gps.gov/technical/ps/2020-SPS-performance-standard.pdf Global Positioning System Standard Positioning Service Performance Standard]</ref> is a positioning and timing service provided on GPS L1, L2 and L5 frequencies and available to all GPS users. The L1 frequency contains a coarse acquisition (C/A) code and a navigation data message. The L2 frequency contains a CM-code and CL-code signals whereas I5-code and Q5-code signals are transmitted in L5 frequency.
	# The Precise Positioning Service (PPS),<ref name="PPS-Standard "/> is a highly accurate military positioning, velocity and timing service broadcasted at the GPS L1 and L2 frequencies. Both frequencies contain a precision (P/Y) code ranging signal with an encrypted navigation data message that is reserved for authorized users.		# The Precise Positioning Service (PPS),<ref name="PPS-Standard "/> is a highly accurate military positioning, velocity and timing service broadcasted at the GPS L1 and L2 frequencies. Both frequencies contain a precision (P/Y) code ranging signal with an encrypted navigation data message that is reserved for authorized users.

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	==Introduction==		==Introduction==

	The levels of performance that the user can expect from GPS are specified in the Standard Positioning Service Performance Standard,<ref name="SPS-Standard "/> and the Precise Positioning Service Standard.<ref name="PPS-Standard">[~~http~~://~~www~~.gps.gov/technical/ps/2007-PPS-performance-standard.pdf Global Positioning System Precise Positioning Service Performance Standard]</ref> However, the values provided by these documents are very conservative, being the actual performances usually better than these official values.		The levels of performance that the user can expect from GPS are specified in the Standard Positioning Service Performance Standard,<ref name="SPS-Standard "/> and the Precise Positioning Service Standard.<ref name="PPS-Standard">[https://archive.gps.gov/technical/ps/2007-PPS-performance-standard.pdf Global Positioning System Precise Positioning Service Performance Standard]</ref> However, the values provided by these documents are very conservative, being the actual performances usually better than these official values.

	Moreover, the performance obtained with GPS depends strongly on the mode of operation. For instance, a stand-alone receiver that uses only the signals received from the satellites, the levels of performance are:<ref>The Modernization of GPS: Plans, New Capabilities and the Future Relationship to Galileo, Keith D. McDonald </ref>		Moreover, the performance obtained with GPS depends strongly on the mode of operation. For instance, a stand-alone receiver that uses only the signals received from the satellites, the levels of performance are:<ref>The Modernization of GPS: Plans, New Capabilities and the Future Relationship to Galileo, Keith D. McDonald </ref>

Gema.Cueto at 12:38, 4 December 2020

2020-12-04T12:38:01Z

← Older revision		Revision as of 12:38, 4 December 2020
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	GPS supplies two different service levels, Standard Positioning Service and the Precise Positioning Service:		GPS supplies two different service levels, Standard Positioning Service and the Precise Positioning Service:
	# The Standard Positioning Service (SPS),<ref name="SPS-Standard ">[https://www.gps.gov/technical/ps/2020-SPS-performance-standard.pdf Global Positioning System Standard Positioning Service Performance Standard]</ref> is a positioning and timing service provided on GPS L1, L2 and L5 ~~frequency~~ frequencies and available to all GPS users. The L1 frequency contains a coarse acquisition (C/A) code and a navigation data message. The L2 frequency contains a CM-code and CL-code signals whereas I5-code and Q5-code signals are transmitted in L5 frequency.		# The Standard Positioning Service (SPS),<ref name="SPS-Standard ">[https://www.gps.gov/technical/ps/2020-SPS-performance-standard.pdf Global Positioning System Standard Positioning Service Performance Standard]</ref> is a positioning and timing service provided on GPS L1, L2 and L5 frequencies and available to all GPS users. The L1 frequency contains a coarse acquisition (C/A) code and a navigation data message. The L2 frequency contains a CM-code and CL-code signals whereas I5-code and Q5-code signals are transmitted in L5 frequency.
	# The Precise Positioning Service (PPS),<ref name="PPS-Standard "/> is a highly accurate military positioning, velocity and timing service broadcasted at the GPS L1 and L2 frequencies. Both frequencies contain a precision (P/Y) code ranging signal with an encrypted navigation data message that is reserved for authorized users.		# The Precise Positioning Service (PPS),<ref name="PPS-Standard "/> is a highly accurate military positioning, velocity and timing service broadcasted at the GPS L1 and L2 frequencies. Both frequencies contain a precision (P/Y) code ranging signal with an encrypted navigation data message that is reserved for authorized users.

Gema.Cueto at 10:03, 30 November 2020

2020-11-30T10:03:16Z

← Older revision		Revision as of 10:03, 30 November 2020
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	GPS supplies two different service levels, Standard Positioning Service and the Precise Positioning Service:		GPS supplies two different service levels, Standard Positioning Service and the Precise Positioning Service:
	# The Standard Positioning Service (SPS),<ref name="SPS-Standard ">[~~http~~://www.gps.gov/technical/ps/~~2008~~-SPS-performance-standard.pdf Global Positioning System Standard Positioning Service Performance Standard]</ref> is a positioning and timing service provided on GPS L1, L2 and L5 frequency frequencies and available to all GPS users. The L1 frequency contains a coarse acquisition (C/A) code and a navigation data message. The L2 frequency contains a CM-code and CL-code signals whereas I5-code and Q5-code signals are transmitted in L5 frequency.		# The Standard Positioning Service (SPS),<ref name="SPS-Standard ">[https://www.gps.gov/technical/ps/2020-SPS-performance-standard.pdf Global Positioning System Standard Positioning Service Performance Standard]</ref> is a positioning and timing service provided on GPS L1, L2 and L5 frequency frequencies and available to all GPS users. The L1 frequency contains a coarse acquisition (C/A) code and a navigation data message. The L2 frequency contains a CM-code and CL-code signals whereas I5-code and Q5-code signals are transmitted in L5 frequency.
	# The Precise Positioning Service (PPS),<ref name="PPS-Standard "/> is a highly accurate military positioning, velocity and timing service broadcasted at the GPS L1 and L2 frequencies. Both frequencies contain a precision (P/Y) code ranging signal with an encrypted navigation data message that is reserved for authorized users.		# The Precise Positioning Service (PPS),<ref name="PPS-Standard "/> is a highly accurate military positioning, velocity and timing service broadcasted at the GPS L1 and L2 frequencies. Both frequencies contain a precision (P/Y) code ranging signal with an encrypted navigation data message that is reserved for authorized users.

Gema.Cueto: /* Standard Positioning Service (SPS) Performances */

2020-11-30T09:59:36Z

Standard Positioning Service (SPS) Performances

← Older revision		Revision as of 09:59, 30 November 2020
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	! colspan="2"\| User Range Error (URE)		! colspan="2"\| User Range Error (URE)
	\| N/A		\| N/A
	\| <7.8 m 95% of time		\| <7.0 m 95% of time
	\|- align="center"		\|- align="center"
	! colspan="2"\| Velocity Accuracy		! colspan="2"\| Velocity Accuracy
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	! colspan="2"\| Time Transfer Accuracy		! colspan="2"\| Time Transfer Accuracy
	\| N/A		\| N/A
	\| <40 ns 95% of time		\| <30 ns 95% of time
	\|- align="center"		\|- align="center"
	! colspan="2" rowspan="2"\| Geometry (PDOP ≤ 6)		! colspan="2" rowspan="2"\| Geometry (PDOP ≤ 6)

Gema.Cueto: /* Standard Positioning Service (SPS) Performances */

2020-11-30T09:58:47Z

Standard Positioning Service (SPS) Performances

← Older revision		Revision as of 09:58, 30 November 2020
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	\| All-in-View Horizontal 95%		\| All-in-View Horizontal 95%
	\| <100 m		\| <100 m
	\|< 9 m		\|< 8 m
	\|- align="center"		\|- align="center"
	\| All-in-View Vertical 95%		\| All-in-View Vertical 95%
	\| <156 m		\| <156 m
	\| < 15 m		\| < 13 m
	\|- align="center"		\|- align="center"
	! rowspan="2"\| Worst Site Accuracy		! rowspan="2"\| Worst Site Accuracy
	\| All-in-View Horizontal 95%		\| All-in-View Horizontal 95%
	\| <100 m		\| <100 m
	\|< 17 m		\|< 15 m
	\|- align="center"		\|- align="center"
	\| All-in-View Vertical 95%		\| All-in-View Vertical 95%
	\| <156 m		\| <156 m
	\| < 37 m		\| < 33 m
	\|- align="center"		\|- align="center"
	! colspan="2"\| User Range Error (URE)		! colspan="2"\| User Range Error (URE)

Gema.Cueto: /* Standard Positioning Service (SPS) Performances */

2020-11-30T09:58:02Z

Standard Positioning Service (SPS) Performances

← Older revision		Revision as of 09:58, 30 November 2020
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	\| <7.8 m 95% of time		\| <7.8 m 95% of time
	\|- align="center"		\|- align="center"
			! colspan="2"\| Velocity Accuracy
			\| N/A
			\| < 0.2 m/sec 95% velocity error
			\|- align="center"

	! colspan="2"\| Time Transfer Accuracy		! colspan="2"\| Time Transfer Accuracy
	\| N/A		\| N/A

Gema.Cueto at 09:54, 30 November 2020

2020-11-30T09:54:55Z

← Older revision		Revision as of 09:54, 30 November 2020
Line 10:		Line 10:

	GPS supplies two different service levels, Standard Positioning Service and the Precise Positioning Service:		GPS supplies two different service levels, Standard Positioning Service and the Precise Positioning Service:
	# The Standard Positioning Service (SPS),<ref name="SPS-Standard ">[http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf Global Positioning System Standard Positioning Service Performance Standard]</ref> is a positioning and timing service provided on GPS L1 frequency and available to all GPS users. The L1 frequency contains a coarse acquisition (C/A) code and a navigation data message.		# The Standard Positioning Service (SPS),<ref name="SPS-Standard ">[http://www.gps.gov/technical/ps/2008-SPS-performance-standard.pdf Global Positioning System Standard Positioning Service Performance Standard]</ref> is a positioning and timing service provided on GPS L1, L2 and L5 frequency frequencies and available to all GPS users. The L1 frequency contains a coarse acquisition (C/A) code and a navigation data message. The L2 frequency contains a CM-code and CL-code signals whereas I5-code and Q5-code signals are transmitted in L5 frequency.
	# The Precise Positioning Service (PPS),<ref name="PPS-Standard "/> is a highly accurate military positioning, velocity and timing service broadcasted at the GPS L1 and L2 frequencies. Both frequencies contain a precision (P/Y) code ranging signal with an encrypted navigation data message that is reserved for authorized users.		# The Precise Positioning Service (PPS),<ref name="PPS-Standard "/> is a highly accurate military positioning, velocity and timing service broadcasted at the GPS L1 and L2 frequencies. Both frequencies contain a precision (P/Y) code ranging signal with an encrypted navigation data message that is reserved for authorized users.

Filipe.Pelica: CNAV performance

2015-04-12T17:34:08Z

CNAV performance

← Older revision		Revision as of 17:34, 12 April 2015
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	In general, PPS performance standards are in line with SPS ones. Some advantages of PPS Service opposite to the SPS Service are that PPS access to WAGE (Wide Area GPS Enhancements) rapid ephemeris updates and corrections, and the use of dual frequency to correct the delay suffered by the signal in its transmission through the [[Ionospheric Delay\|ionosphere]] in real time, which implies a significant performance improvement. The P/Y code is encrypted to avoid spoofing and the access to the service to unauthorised users.		In general, PPS performance standards are in line with SPS ones. Some advantages of PPS Service opposite to the SPS Service are that PPS access to WAGE (Wide Area GPS Enhancements) rapid ephemeris updates and corrections, and the use of dual frequency to correct the delay suffered by the signal in its transmission through the [[Ionospheric Delay\|ionosphere]] in real time, which implies a significant performance improvement. The P/Y code is encrypted to avoid spoofing and the access to the service to unauthorised users.

			==Modernized Signals Performances==
			Since the beginning of the transmission of the CNAV navigation message, by April 2014, the L2C signal is suffering several improvements. On March 2015 the U.S. Air Force reported that signal performance of CNAV matches or slightly outperforms Legacy performance: average user range error (RMS URE) from 25 February – 3 March 2015 was 0.50 m for Legacy and 0.57 m for Modernized; best week for Modernized signals since the broadcast initiated April 2014 was 0.42 m for 6 – 13 January 2015<ref>[http://gpsworld.com/cnav-performance-matches-or-slightly-outperforms-legacy-signals/ CNAV Performance ‘Matches or Slightly Outperforms’ Legacy Signals], GPS World, March 19, 2015</ref>.

	==Combined Services Performances==		==Combined Services Performances==

Filipe.Pelica: Included editor logo.

2014-09-18T16:40:27Z

Included editor logo.

← Older revision		Revision as of 16:40, 18 September 2014
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	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
			\|Logo=GMV
	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	}}		}}

Filipe.Pelica: fixed broken link

2014-05-29T13:47:47Z

fixed broken link

← Older revision		Revision as of 13:47, 29 May 2014
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	==Introduction==		==Introduction==

	The levels of performance that the user can expect from GPS are specified in the Standard Positioning Service Performance Standard,<ref name="SPS-Standard "/> and the Precise Positioning Service Standard.<ref name="PPS-Standard">[http://~~pnt~~.gov/~~public~~/~~docs~~/2007~~/ppsps2007~~.pdf Global Positioning System Precise Positioning Service Performance Standard]</ref> However, the values provided by these documents are very conservative, being the actual performances usually better than these official values.		The levels of performance that the user can expect from GPS are specified in the Standard Positioning Service Performance Standard,<ref name="SPS-Standard "/> and the Precise Positioning Service Standard.<ref name="PPS-Standard">[http://www.gps.gov/technical/ps/2007-PPS-performance-standard.pdf Global Positioning System Precise Positioning Service Performance Standard]</ref> However, the values provided by these documents are very conservative, being the actual performances usually better than these official values.

	Moreover, the performance obtained with GPS depends strongly on the mode of operation. For instance, a stand-alone receiver that uses only the signals received from the satellites, the levels of performance are:<ref>The Modernization of GPS: Plans, New Capabilities and the Future Relationship to Galileo, Keith D. McDonald </ref>		Moreover, the performance obtained with GPS depends strongly on the mode of operation. For instance, a stand-alone receiver that uses only the signals received from the satellites, the levels of performance are:<ref>The Modernization of GPS: Plans, New Capabilities and the Future Relationship to Galileo, Keith D. McDonald </ref>