SatelliteOperatio
ns
SatelliteOperatio
ns
TeleCommTeleComm
Oil ExplorationOil Exploration
Trucking & Shipping
Trucking & Shipping
Surveying & MappingSurveying & Mapping
Precision AgriculturePrecision
Agriculture
GPS enables a diverse array of applications
Power GridsPower Grids
IntelliDriveIntelliDrive
NextGenNextGenTransit
Operations
TransitOperatio
ns
Disease ControlDisease Control
Personal NavigationPersonal
Navigation
Fishing & BoatingFishing & Boating
GPS Constellation Status
• Very robust constellation; exceeds user requirements
• 31 satellites currently in operation
• 11 GPS IIA
• 12 GPS IIR
• 7 GPS IIR-M
• 1 GPS IIF (set healthy 26 Aug 2010)
• 4 additional satellites in residual status
• 1 additional IIR-M waiting to be set healthy
• Global GPS civil service performance commitment met continuously since December 1993
Baseline Constellation = “24 Expandable”
3
4
GroundAntenna
Master Control Station (Schriever AFB)
GPS Operational Control Segment (OCS)
AscensioAscensionn
Diego Diego GarciaGarcia
Cape Cape CanaveralCanaveralHawaiiHawaii
Kwajalein Kwajalein
Schriever Schriever AFB AFB
ColoradoColorado S KoreaS Korea
AustraliaAustralia
BahrainBahrain
S AfricaS Africa
EnglandEngland
ArgentinaArgentina
EcuadorEcuador
TahitiTahiti
USNOUSNO
AlaskaAlaska
MonitorStation
New New ZealanZealandd
Vandenberg Vandenberg AFB AFB
CaliforniaCalifornia
NGA Monitor Station
OCS Monitor Station
Ground Antenna Future Monitor Station
Master Control Station
Alternate Master Control Station
5
N/A
1.61.2 1.1
0.9
0
1
2
3
4
5
6
7
RM
S S
IS U
RE (
m)
RM
S S
ignal-
in-S
pace
Use
r R
an
ge E
rror
(UR
E),
m
ete
rs
2008 SPS Performance Standard(Worst of any SPS SIS URE)
2001 SPS Performance Standard(RMS over all SPS SIS URE)
N/A N/A N/AN/A
Selective Availability (SA)
System accuracy exceeds published standard
System accuracy exceeds published standard
Signal-in-Space User Range Error is the difference between a GPS satellite’s navigation data (position and clock) and the truth, projected on the line-of-sight to the user
1990 1992 1994 1996 1997 2001 2004 2006 20092008
1.0
Current GPS Accuracy
6
GPS Modernization
GPS II R / IIR-MGPS II R / IIR-M
20052005
• IIA/IIR capabilities plus• 2nd civil signal
(L2C)• M-Code (L1M &
L2M)
GPS IIAGPS IIA
19951995
• Standard Service• Single
frequency (L1)• Coarse
acquisition code navigation
• Precise Service• Y-Code (L1Y &
L2Y)
GPS IIFGPS IIF
20102010
• IIR-M capability plus• 3rd civil signal
(L5)• 12 year design
life
GPS IIIGPS III
2014 - 20252014 - 2025
• Backward compatible• 4th civil signal (L1C)• Increased accuracy• Increased integrity
Architecture Evolution Plan
(AEP)
Next Generation
Control Segment
(OCX)
LegacyControlSystem
7
Latest U.S. Policy
• Provide continuous worldwide access for peaceful uses, free of direct user charges
• Encourage compatibility and interoperability with foreign GNSS services
• Operate and maintain constellation to satisfy civil and national security needs– Foreign PNT may be used to strengthen
resiliency
• Invest in domestic capabilities and support international activities to detect, mitigate and increase resiliency to harmful interference
8
Summary
• GPS performance is better than ever and will continue to improve– Augmentations enable even higher
performance– New civil GPS signal available now– Many additional upgrades scheduled
• U.S. policy encourages worldwide use of civil GPS and augmentations– Permits U.S use of foreign PNT to increase
resiliency
• International cooperation is a priority– Compatibility and interoperability are critical
9
For Additional Information…
GPS.gov PNT.gov
10
Contact Information
Hank SkalskiDOT Liaison to Air Force Space
Command
Air Force Space Command Headquarters
AFSPC/OST150 Vandenberg St., Suite 1105
Peterson AFB, CO 80914
Phone: +01.719.554.2570Fax: +01.719.554.6719
Email: [email protected]