Position, Navigation and Timing Advisory Board: Strategic Engagement

1
Position, Navigation and TimingAdvisory
BoardStrategic Engagement CommunicationMarch
27-28, 2008
2
SEC - Update

• Intro
• PNT Hill Day - March 14
• ICG involvement
• Asia Pacific Economic Cooperation - GNSS
  Implementation Team, Meeting
• May 26-30 Bangkok - outreach/engagement
  opportunity
• Situational awareness - approach
• Panel recommendations plans
• Varia

3
Recommendations (1)

• 30 satellite constellation critical for ALL user
  applications
• Assured availability, accuracy, integrity
• Explore constellation orbit design wrt
  GLONASS/Galileo and Beutler/Flohrer analysis -
  see Beutler presentation
• Performance, inter-system biases and
  interchangeability issues 6 or more sats
  visible for assured performance
• US security (domestic, ecomomic, intl US
  interests) disaster response in urban areas,
  operations in mountainous terrain, face same
  issues of signal availability
• Satellite laser-ranging retro-reflectors should
  be placed on GPS satellites as soon as possible
• Independent accuracy checks are mandatory, not a
  luxury

4
Recommendations (2)

• Situational awareness
• GPS as global critical infrastructure requires a
  means to measure, detect, and geolocate
  interference
• Review National PNT Plan for Interference
  Detection and Mitigation, and Implementation Plan
• Explore demonstration of IDM instruments,
  sub-group to be led by Terry McGurn
• Confirmation of policy openly available, no user
  fees
• Emphasize importance in implementation in
  practice of common reference frame and timing
• ITRF GGTO(?)

5
Recommendations (3)

• Ensure adequate funding for space and ground
  infrastructure, critical
• Global geodetic infrastructure and assured,
  stable resources for all agencies involved
  leadership model of support for intl investments
• Underscore importance of GPS for
• Climate change, natural hazards, sea level rise,
  ice, earthquakes, volcanoes, tsunamis, weather,
  space weather, gravity field
• Group on Earth Observation / System of Systems
  GEO/GEOSS
• Engagement in Africa - AFREF, training and
  coordination meetings
• Support needed in developing countries to bridge
  digital divide
• US-China Workshop May, Boulder - Earthquake
  Research
• GPS key component

6
Plans

• Report on Situational awareness
• Contribute to transition report
• Other to be developed
• Monitoring, ITRF, Timing - GGTO,
• Next meeting
• US Dept of Agriculture
• GPS as a key tool for understanding climate
  change
• Options for independent monitoring
• Galileo expert briefing

7
National Research Council's Committee National
Requirements for Precision Geodetic Infrastructure

• Statement of taskImprovements in positioning,
  navigation, and timing have always driven
  exploration and understanding of our world.
  Recognizing the national importance of
  maintaining and improving the global, high
  precision geodetic infrastructure that is
  fundamental to scientific discovery and
  leadership, and their applications to societal
  well-being and a vast array of commercial
  activity, an NRC committee will
• Describe and assess the range of benefits to the
  nation that are dependent on high precision
  geodetic networks
• Review high priority scientific objectives that
  are dependent on geodetic networks
• Describe the infrastructure requirements for
  achieving these objectives and benefits
• Assess the opportunities for technological
  innovation that will arise from renewed
  investment in geodetic infrastructure
• Recommend a national plan for the implementation
  of a precision geodetic infrastructure.
• No budgetary recommendations will be made
• First meeting April 7, 2008

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(No Transcript)
9
GPS Policy Affects Civil Use - 1980
10
Why Monitor?

• Monitoring allows characterization of a systems
  processes, determines any inherent variability,
  determines whether or not the system is in
  control, and ultimately helps to optimize
  performance and control.
• Monitor and control permit system assessment,
  management, failover mode decisions, and quality
  assurance of the system or its output.
• Monitoring is based on requirements and/or
  performance specifications.

11
Definitions

• Integrity the quality relating to trust which
  can be placed in the correctness of the
  information supplied by the total system
  assurance of availability, quality and
  reliability.
• Integrity risk probability of an undetected
  failure a specified system accuracy. Integrity
  includes the ability of a system to provide
  timely warnings to the user when the system
  should not be used for the intended operation or
  application
• System monitoring describe system performance
  with respect to specifications normally a part
  of the system.
• Performance assessment characterize system in
  terms of a relevant metric performance
  characterization independent of the system,
  external

• Monitor to watch, observe, or check closely or
  continuously, to keep track of systematically
  with a view to collecting information
• Accuracy nearness to truth, how close a
  measurement is to the real value. Correctness of
  information can be measured in the form of a
  quantitative value given for a parameter
• Precision the ability of a measurement to be
  consistently reproduced, the quality of being
  reproducible in amount or performance.
• Consistency a first measure of quality and
  integrity.

12
We Trust Our Sources

• National Weather Service (NWS) has a component
  called the NWS Cooperative Program
• Willingness to use a variety of data sources
• Probably weight their own station data highest
  when it comes (eg.) declaring a tornado warning
• Train ordinary people to describe and report
  weather conditions
• Information feeds back into their system as an
  enhancement, augmentation, and finer sampling
• Lessons learned for GPS? Great opportunity for
  leveraging low investment - coordination required

Neighborhood watch for GPS/GNSS?