multi-modal update: nationwide differential gps 14 th meeting of the apec gnss implementation team...
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Multi-Modal Update:Nationwide Differential GPS
14th Meeting of the APEC GNSS Implementation Team
Marriott Renaissance HotelRegional Meeting
Seattle, WAJune 23, 2010
Timothy A. KleinSenior Policy Advisor/RITA NDGPS Coordinator
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Nationwide Differential GPS
• Expansion of maritime differential GPS (DGPS) network to cover terrestrial United States– Compliant with RTCM SC-104 and ITU-RM.823– 50 nations operate compatible systems– Proven technology and performance
• System characteristics– Accuracy: 1 to 3 meters typical; better observed– Post-processed: 2 to 5 cm– Integrity: 5 seconds to alarm at 100 bps– Availability: 99.7% with single coverage
99.9% with dual coverage
• Current coverage– Single coverage: 92% of continental U.S.– Double coverage: 65% of continental U.S.
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NDGPS Coverage
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• Transportation operational requirements:– Federal Highway Administration (FHWA)
– on behalf of state and local DOT stakeholders– routine use in Federal-Aid Program– survey, construction, quality, asset management– roadside management– law enforcement
– Association of American Railroads– baseline reference
– National Governor’s Association– use by state DOTs, resource
management agencies
Terrestrial NDGPS Capabilities and Uses
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• Other federal, state/local and private operational requirements:
– Department of Agriculture/Department of Interior (NPS, USFS, BLM, etc.)
– One meter real-time positioning and navigation– Fire management and safety
– Department of Commerce (NOAA)– Continuously Operating Reference Stations– Severe weather forecasting
– State, County and Local Governments– Departments of Transportation, Natural
Resources, Environmental Protection, Agriculture, Parks
– Private/Non-Profit Sector– U.S. GPS Industry Council– National Precision Farming Association– Professional Land Surveyors
Terrestrial NDGPS Capabilities and Uses (2)
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Cooperation with Canada
• 16 U.S. and 11 Canadian DGPS sites cooperate for increased coverage along the border
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NDGPS in Dredging
• Army Corps of Engineers uses include:– Aids to Navigation– Underwater Surveying– Dredging (2 meter accuracy requirement)
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Precision Agriculture
• Maximize use of resources– Optimized plowing of crop rows– Tailored applications of seeds, fertilizer, water, pesticides– Improved management of land, machinery, personnel, time– Greater crop yields
• Minimize environmental impacts– Localized identification and treatment of distressed crops
reduces chemical use– Precise leveling of fields prevents fluid runoff
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States and Local Governments – Public Safety
• Emergency response– Law Enforcement
– Fire Fighting
– Search and Rescue
– Paramedics
– Disaster Relief
• Transportation Management– Traffic operations systems
– Public road inventory
– Asset management
– Snowplow guidance
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Severe Storm Forecasting
• NOAA’s Earth Systems Research Laboratory uses M/NDGPS data to estimate the amount of water vapor over the U.S. every 30 minutes
– Used by weather forecastersto monitor rapidly changingconditions
– This knowledge is critical for forecasting severe weather events such as tornados, hurricanes, thunderstorms, and snow storms
– Used in several operational NOAA weather models
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Monitoring Space Weather
• NOAA’s Space Weather Prediction Center uses NDGPS data to map the spatial distribution of free electrons in the ionosphere, once every 15 minutes
– The distribution of free electrons in the ionosphere affects HF radio communication and delays the arrival of GPS signals
– Delay is interpreted as position errors, which can be as large as 100 meters in extreme cases
– Solar storms proven to affect on-orbit satellite performance andtransmissions, including GPS
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National Continuously Operating Reference Stations (CORS)• Enables highly accurate,
3-D positioning post-processed– 1 – 10 cm-level precision
in differential mode– Tied to National Spatial
Reference System– Feeds into local RTNs
(not competitive)
• 1,200+ sites operated by 200+ public, private, academic organizations• NOAA’s Online Positioning User Service (OPUS) automatically processes coordinates submitted via the web from around the world
• OPUS-RS (Rapid Static) delivers results from user data sets as short as 15 minutes (post-processed)
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• NOAA/National Geodetic Survey test-streaming NDGPS corrections to users over Internet
– Improved civil sector customer service– Enabling technology for commercial services
• DHS expects NDGPS to be part of GPS Interference Detection and Monitoring (IDM) capability
– Critical infrastructure protection beyond transportation– Could support a Nationwide Emergency Communications System
• DOT continuing to pursue potential high accuracy (HA-NDGPS) upgrade (1 cm dynamic accuracy) as possible ITS enabling technology
– Joint documentation meetings (DOT/FHWA, Coast Guard)– Depends upon requirements
NDGPS Opportunities
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ITS/IntelliDriveSM Safety Applications
• Leverage technology to make vehicles discoverable to other vehicles, infrastructure, and pedestrians
• Enable 360° situational
awareness to the vehicle and driver