GPS Status

1
GPS Status Modernization Briefing to National
PNT Advisory Board 29 March 2007
Col Allan Ballenger Commander, GPS Wing
2
Overview

• GPS System Description
• GPS Constellation Status Availability
• Recent GPS Accomplishments
• GPS Modernization
• Summary

Department of Defense and Air Force are
committedto responsible stewardship of GPS as a
global utility
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GPS System DescriptionMission
4
GPS System DescriptionGPS Enterprise

• International Cooperation
• Japan QZSS
• Russia - GLONASS
• Europe and other countries

• Department of Defense
• Services (Army, Navy, AF, Marines)
• Agencies (NGA, DISA, etc.)

• Civil Applications
• Search and rescue
• Surveying and mapping
• Trucking, shipping and Aviation
• Banking and Finance
• Offshore drilling
• Fishing and boating

• Department of Transportation
• Federal Aviation Administration (FAA)

• Department of Homeland Security
• Coast Guard

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GPS System DescriptionWhat Are the GPS Segments?
6
GPS Constellation Status Availabilityas of
March 2007
30 Healthy Satellites Baseline Constellation 24

• 16 Block IIA satellites operational
• 12 Block IIR satellites operational
• 3 Block IIR-M satellites operational
• 5 additional IIR-M satellites to launch
• Since Dec 93, U.S. Government met/exceeded civil
  GPS service performance commitments
• SPS Performance Standard (PS)
• U.S. DoD committed to superior GPS service

as of 26 Mar 07
7
GPS Constellation Status AvailabilityGrowing
to 30 Satellites

• IIR-15(M) launched Monday, 25 Sep 06
• Set healthy Thursday, 12 Oct 06, SVN 52 - PRN
  31
• 17 days from launch to on-orbit ops
• IIR-16(M) launched Friday, 17 Nov 06
• Set healthy 13 Dec 06, SVN 58 - PRN 12
• PRNs 12 32 return to ops allows growth to 32
  SV constellation
• Larger constellation for improved availability
  accuracy

PRN Pseudo Random Noise (spreading code) SVN
Space Vehicle Number
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Recent GPS Accomplishments

• Launched a new era of GPS services
• First GPS IIR-M (14) launched 25 Sep 05,
  operational 16 Dec 05
• New military signal (M-Code) and new civil signal
  (L2C)
• GPS IIR-M (15) launched 25 Sep 06 IIR-16(M)
  launched 17 Nov 06
• Fielded operational improvements
• Legacy Accuracy Improvement Initiative improves
  position accuracy over 10
• Provide zero age of data to warfighters
• Delivered 100,000 DAGRs, 250,000 SAASMs
• OSD/NII signed Precise Positioning Service
  Performance Standard,23 Feb 07 enables
  certification of military GPS use in US airspace
• New acquisition strategies for next generation
  GPS
• Back to Basics and incremental block approach
• GPS Block III satellites
• GPS Block III Next-Generation Control Segment
  (OCX)
• Modernized User Equipment/Modernized Space
  Receiver

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Recent GPS Accomplishments Our Mission Successes
GPS IIR-13 6 Nov 04
GPS IIR-15(M) 25 Sep 06
GPS IIR-14(M) 25 Sep 05 1st Modernized GPS
Satellite
GPS IIR-16(M) 17 Nov 06
A world class team providing worldwide position,
navigation timing!
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Recent GPS Accomplishments Continuous Performance
Improvement

• Key Measures of Effectiveness help evaluate GPS
  services
• Accuracy
• Bounded inaccuracy
• Assured Availability
• Integrity
• Resistance to RF Interference/Jamming

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Recent GPS AccomplishmentsLeveraging
Civil/Commercial Technology
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GPS ModernizationCapability Evolution
Space Segment

• GPS III (Block III)
• Increased accuracy
• Increased A/J power(up to 20 dB)
• Signal integrity
• Search and Rescue
• Common signals with Galileo (L1C)

• Modernized (Block IIR-M)
• 2nd civil signal (L2C)
• M-Code signals (L1M, L2M)
• Flex A/J power (7dB)

• Modernized (Block IIF)
• 3rd civil signal (L5)

• Legacy (Block IIA/IIR)
• Basic GPS
• C/A civil signal (L1C/A)
• Std Pos. Service
• Precise Pos. Service
• L1 L2 P(Y) nav
• NDS

Control Segment

• Upgraded (AEP)
• IIR-M IIF TTC
• WAGE, AII, LADO
• SAASM
• New MCS/AMCS

• Legacy
• TTC
• L1 L2 monitoring

• Modernized (OCX V1)
• New Architecture
• Signal Monitoring

• GPS III (OCX V2)
• GPS III TTC
• NAVWAR, GNOC
• L1C, L2C, L5
• Flex Power
• Real-Time C2

User Segment

• Legacy
• Man Pack
• MAGR, PLGR
• RCVR-3A, 3S
• OH, UH
• FRPA, CRPA

• Upgraded
• DAGR
• CSEL

• Modernized
• MUE
• MSR

• GAS-1
• MAGR2K
• GB-GRAM

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Summary

• Sustaining capabilities for military and civil
  users worldwide
• Maintain ground systems/on-orbit satellites,
  launch new satellites
• Fielding GPS enhancements, such as Legacy
  Accuracy Improvement
• Modernizing constellation with new signals and
  capabilities
• First IIR-M launch Sep 05, first IIF launch 2008,
  first III launch 2013
• New civil and military GPS signals
• Transitioning control segment from legacy to new
  architecture/systemby Summer 07
• Continuing work with Galileo and international
  community
• Developing next generation of GPS
• Acquisition strategies for space, ground, and
  user segments
• Synchronizing space, control, and user equipment
  upgrades
• Back to Basics focus and incremental block
  approach
• Managing GPS systems supporting stakeholders
• Technical baselines, interfaces, performance
• Supporting/participating in key fora NPEC/NPCO,
  DSB, IRT, PNT FACA

Department of Defense and Air Force are committed
to responsible stewardship of GPS as a global
utility