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The U'S' SpaceBased PNT Current Program and Future Trends

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Title: The U'S' SpaceBased PNT Current Program and Future Trends


1
The U.S. Space-Based PNT Current Program and
Future Trends
Michael Shaw Director U.S. National Coordination
Office
2
Introduction
  • During the past decade, GPS has grown into a
    global utility providing space-based positioning,
    navigation and timing (PNT)
  • Consistent, predictable, dependable policy and
    performance
  • Augmentations improve performance
  • Like the Internet, GPS is a critical component of
    the global information infrastructure
  • Scalable applications enabling broad new
    capabilities
  • Innovations in efficiency, safety, environmental
    protection, public security and science

3
GNSS Applications Support A Wide Range of
Economic Activities
Satellite Operations
Power Grid Management
Trucking Shipping
Communications Network Synchronization
Personal Navigation
Fishing Boating
Aviation
Surveying Mapping
Oil Exploration
Precision Agriculture
3
4
GNSS is Key to Scientific Monitoring of the Earth
To better understand the changes and complex
dynamic processes of our home planet
5
Overview
  • Program
  • Policy
  • International Cooperation

6
Global Positioning System (GPS)
  • Baseline 24 satellite constellation in Medium
    Earth Orbit
  • Global coverage, 24 hours a day, all weather
    conditions
  • Satellites broadcast precise time and orbit
    information on L-band radio frequencies
  • Two types of signals
  • Standard (free of direct user fees)
  • Precise (U.S. and allied military)
  • Three segments
  • Space
  • Ground control
  • User equipment

7
GPS Constellation
31 Operational Satellites As of 1 Apr 2008
(Baseline Constellation 24)
  • 13 Block IIA satellites
  • 12 Block IIR satellites
  • 6 Block IIR-M satellite
  • Transmitting new second civil signal (L2C)
  • Continuously assessing constellation health to
    determine launch need
  • 2 Block IIR(M) satellites remaining
  • Next launch June 2008
  • Global GPS civil service performance commitment
    met continuously since December 1993

8
GPS Operational Control Segment (OCS)
Alaska
England
Schriever AFB Colorado
S Korea
Vandenberg AFB California
USNO
Cape Canaveral
Hawaii
Bahrain
Kwajalein
Ecuador
Tahiti
Diego Garcia
Ascension
S Africa
Argentina
Australia
New Zealand
Ground Antenna
OCS Monitor Station
Master Control Station
Monitor Station
NGA Monitor Station
Backup Master Control Station
Ground Antenna
Future Monitor Station
Master Control Station (Schriever AFB)
9
GPS Modernization the Future
  • Second civil signal L2C
  • Designed to meet commercial needs
  • Higher accuracy through ionospheric correction
  • Began with GPS Block IIR-M in Sep 2005 24
    satellites 2014
  • Third civil signal L5
  • Designed to meet demanding requirements for
    transportation safety-of-life
  • Uses highly protected Aeronautical Radio
    Navigation Service (ARNS) band
  • Begins with GPS Block IIF
  • 1st launch 2008 (GPS IIR-M Demo) 2009 (GPS
    IIF) 24 satellites 2016
  • Fourth civil signal L1C
  • Designed with international partners for GNSS
    interoperability
  • Begins with GPS Block III
  • First launch 2014 24 satellites 2021

10
Continuous Performance Improvement
  • Key measures of effectiveness to evaluate GPS
    services
  • Accuracy
  • Bounded inaccuracy
  • Assured availability
  • Integrity
  • Resistance to RF interference/jamming

Accuracy
Performance Standard
Decreasing range error
Year
11
U.S. Policy History
  • 1978 First GPS satellite launched
  • 1983 President offered free civilian GPS access
    to GPS
  • 1996 Established joint civil/military GPS
    management
  • 1997 Congress passes law providing civil GPS
    access free of direct user fees
  • 2000 President set Selective Availability to
    Zero
  • 2004 President issues U.S. Policy on Space-Based
    PNT
  • 2007 President announces Selective Availability
    eliminated from future GPS III satellites

12
2004 U.S. Space-Based PNT Policy
  • No direct user fees for civil GPS services
  • Open public signal structures for all civil
    services
  • Promotes equal access for user equipment
    manufacture, applications development and
    value-added services
  • Encourages open market-driven competition
  • Encourage use of GPS time, geodesy and signal
    standards
  • Promote global compatibility and interoperability
    of GNSS systems with GPS
  • Protect the radionavigation spectrum from
    disruption and interference
  • Recognition of national and international
    security issues and protect against misuse

13
2004 U.S. Space-Based PNT Policy
  • Recognizes the changing international scene
  • Other nations are implementing space-based
    systems that provide PNT services
  • National Executive Committee for Space-Based PNT
  • Chaired by Deputy Secretaries of Defense and
    Transportation
  • Membership includes State, Interior,
    Agriculture, Commerce, Homeland Security, Joint
    Chiefs of Staff and NASA
  • Established National Coordination Office with
    staff from each member agency

14
U.S. Space-Based PNT Structure
WHITE HOUSE
Ad Hoc Working Groups
15
U.S. Space-based PNT Advisory Board
  • Conducts assessments makes recommendations to
    the Executive Committee in support of national
    policy goals and objectives for space-based PNT
  • Twenty-four members 6 international members
  • Met twice in 2007
  • Last meeting 27-28 March 2008

16
Key Executive Committee Activities
Eight meetings since 2006
  • Five-Year National Space-Based PNT Plan
  • Summarizes EXCOM agency planning for development,
    acquisition, sustainment and modernization of
    U.S. space-based PNT systems
  • Interference Detection and Mitigation Plan
  • Department of Homeland Security coordinating U.S.
    capabilities to detect and mitigate sources of
    interference to GPS and its augmentations
  • National PNT Architecture
  • Provides national PNT framework/investment
    strategy to help guide future PNT
    system-of-systems investment 2025 timeframe
  • International Cooperation and Consultation
  • Compatibility and interoperability with other
    foreign systems

17
2004 U.S. Space-Based PNT Policy International
Relations
  • Goals
  • U.S. space-based PNT systems and services remain
    essential components of internationally accepted
    services
  • Promote U.S. technological leadership in
    applications involving space-based PNT services
  • To achieve these goals, the U.S. shall
  • Encourage foreign development of PNT
    services/systems based on GPS
  • Seek to ensure foreign space-based PNT systems
    are interoperable with civil GPS and
    augmentations
  • At a minimum ensure compatibility
  • Promote use of GPS and its augmentations, civil
    services and standards with foreign govts and
    other intl organizations

18
Existing and Future GNSS
  • Global Constellations
  • GPS
  • GLONASS
  • Galileo
  • Compass
  • Regional Constellations
  • QZSS
  • IRNSS
  • Satellite-Based Augmentations
  • WAAS
  • EGNOS
  • MSAS
  • GAGAN

Future
19
Goal of Civil Interoperability
Example
  • Ideal interoperability provides users a PNT
    solution using signals from different GNSS
    systems
  • No additional receiver cost or complexity
  • No degradation in performance

Interoperable Better Together Than Separate
20
U.S. Objectives with Other GNSS Service Providers
  • Ensure compatibility ? ability of U.S. and
    non-U.S. space based PNT services operating
    separately or together without interfering with
    each individual service or signal
  • Radio frequency compatibility
  • Spectral separation between M code and other
    signals
  • Achieve interoperability ability of civil U.S.
    and non-U.S. space-based PNT services operating
    together to provide better user capabilities
    than by relying on one service or signal
  • Primary focus on the common L1C and L5 signals

Pursue through Bi-lateral and Multi-lateral
Cooperation
21
U.S. - Europe Cooperation
  • Activity is divided among four working groups
  • Radio frequency compatibility
  • Trade issues
  • Technological developments and
    future designs
  • Security issues
  • Improved new civil signal (MBOC)
    adopted in July 2007
  • U.S. -- EU agreement signed in 2004 provides
    solid foundation for cooperation

June 26, 2004, press conference at U.S.-EU Summit
in Ireland (U.S. Sec. of State Colin Powell,
Irish Foreign Minister Brian Cowen, EU
Vice-President Loyola De Palacio)?
22
International Committee on Global Navigation
Satellite Systems (ICG)?
  • Emerged from 3rd UN Conference on Exploration and
    Peaceful Uses of Outer Space - July 1999
  • Promote the use of GNSS and its integration into
    infrastructures, particularly in developing
    countries
  • Encourage compatibility and interoperability
    among global and regional systems
  • Members include
  • GNSS providers (U.S., EU, Russia, China, India,
    Japan)
  • Other member states of the United Nations
  • International organizations/associations
  • U.S. will host next ICG in Pasadena, CA - Dec 2008

23
Summary
  • U.S. Space-based PNT effort progressing well in
    policy, programs and international outreach
  • Implementation of 2004 U.S. Policy proceeding
    well
  • U.S. space-based PNT system performance
    continue to imimprove into the future
  • International cooperation is a top U.S.
    priority
  • Actively engaged in multi-lateral/bi-lateral
    consultations
  • New GNSS applications emerging

As new space-based GNSSs emerge, compatibility
and interoperability is the key to success for
all
24
Web-based Information
  • PNT.gov established to provide a source for
    information about U.S. Space Based PNT Program
    including
  • U.S. policy, Executive Committee membership,
    Advisory Board and frequently asked questions
  • Announcements about Selective Availability and
    offer letter to International Civil Aviation
    Organization
  • Recent public presentations
  • GPS.gov established for public information about
    GPS applications
  • Available in English, French, Spanish, Arabic and
    Chinese
  • Brochures also available in hardcopy upon request
  • Links to various other Web sites

25
Contact Information
  • Michael E. Shaw Director
  • U.S. National Coordination Office Space-Based
    Positioning, Navigation and Timing 1401
    Constitution Ave, N.W. Washington, D.C.
    20230-0001
  • Ph (202) 482-5809 Fax (202) 482-4429 michael.sh
    aw_at_pnt.gov
  • This presentation and other GPS
    information www.pnt.gov
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