GPS Modernization

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GPS Modernization
14 March 2005 CGSIC IISC Europe
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Civil SatNav Applications

• Enabling technology
• Unlimited growth potential
• 68 billion industry worldwide by year 2010
• Wide use in transportation safety
• Aviation, maritime, railroad, highway, etc.
• Potential to reduce land-based navigation systems
• Centerpiece of future transportation
  infrastructure
• Ever increasing range of civil uses
• Telecommunications, surveying, law enforcement,
  emergency response, agriculture, mining, etc.
• Used in conjunction with remote sensing
• Supporting civil applications never envisioned

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GPS Modernization Plan
Block IIA/IIR
Block III
Block IIR-M, IIF

• III IIF capabilities
• Improved civil signal (L1C)
• Increased accuracy (4.8-1.2m)
• Evaluating integrity improvements
• Navigation surety
• Increased A/J power (20 dB)

• IIA / IIR Basic GPS
• C/A civil signal (L1C/A)
• Std Service, 16-24m SEP
• Precise Service, 16m SEP
• L1 L2 P(Y) nav

• IIR-M IIA/IIR capabilities
• 2nd civil signal (L2C)
• New military code
• Flex A/J power (7dB)
• IIF IIR-M capability plus
• 3rd civil signal (L5)

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Civil Benefits of GPS Modernization

• New signals provide
• Reduced vulnerability to interference
• Calculation of ionospheric corrections at user
  site
• Improvements in service performance in accuracy,
  availability, integrity, and reliability
• Provide centimeter-level accuracy for scientific
  and survey applications
• New spectrally separated signals
• Preserve civil use outside areas of military ops
• New commercial opportunities
• Opportunity to converge services with other
  global satellite navigation systems

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Second Civil Signal (L2C)
Begins with IIR-M sats First launch May 2005 24
Satellites 2012

• Benefits of L2C
• Improves service for 50,000 current scientific/
  commercial dual-frequency users
• Extends service for safety-of-life,
  single-frequency E-911 applications
• Provides 24 dB better protection than C/A against
  code cross correlation and continuous wave (CW)
  interference
• Signal defined in ICD-GPS-200C

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Third Civil Signal (L5)
L5 code
Begins with IIF sats First launch 2007 24
Satellites 2014

• Benefits of L5
• Improves signal structure for enhanced
  performance
• Higher power (-154.9 dBW)
• Wider bandwidth (24 MHz)
• Aeronautical Radionavigation Services band
• Co-primary allocation at WRC-2000
  (1164-1215MHz)
• Signal defined in IS-GPS-705

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L1C Signal
L1C
Begins with GPS III sats First launch 2012 24
Satellites 2017

• Benefits of L1C
• Adds a modernized L1 civil signal
• In addition to C/A code to ensure backward
  compatibility
• Higher precision
• Added interference protection
• Enables civil interoperability with Galileo
• Converges with Galileo L1 Open Service

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GPS III Status

• Contracts awarded in January 2004
• To Lockheed and Boeing for 12-month
  requirements definition effort
• Leading to Systems Requirements Review
• Selection of final contractor anticipated in 2005
• First launch projected for 2012

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GPS III Civil Benefits

• Significant increase in system accuracy
• Improve robustness to interference
• Improve level of unaugmented integrity
• Improve availability of accuracy with integrity
• Backward compatibility with existing receivers
• Operational capability for L2C and L5
• In combination with GPS IIR-M and IIF satellites
• Flexibility to respond to evolving requirements
  with limited programmatic impacts
• Opportunity to converge with Galileo Open Service

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Legacy Improvement

• Legacy Accuracy Improvement Initiative by Air
  Force and National Geospatial-Intelligence Agency
  in 2005
• Additional info decreases Age of Data, thus
  increasing accuracy in GPS satellite orbital
  position and clock data
• Integrity Failure Modes and Effects Analysis
• Knowledge of GPS failure modes required to design
  improved integrity monitoring systems

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Current GPS Monitoring Stations
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GPS Monitoring Stations
Accuracy Improvement Initiative (AII)
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Modernization Information

• JPO GPS Modernization
• http//gps.losangeles.af.mil/engineering/icwg/
• Navigation Information Service
• http//www.navcen.uscg.gov
• http//www.navcenter.org/ (mirror site)
• E-mail nisws_at_navcen.uscg.mil
• Phone [phone]
• Fax [phone]

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