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Real Time Network Activities a t T he National Geodetic Survey

Real Time Network Activities a t T he National Geodetic Survey. Neil D. Weston National Geodetic Survey, NOS, NOAA. Silver Spring, Maryland -- 31 January, 2013. Background. NGS Real Time Network (prototype only) 21 CORS Streaming near-real time observables

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Real Time Network Activities a t T he National Geodetic Survey

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  1. Real Time Network Activities at The National Geodetic Survey Neil D. Weston National Geodetic Survey, NOS, NOAA Silver Spring, Maryland -- 31 January, 2013

  2. Background • NGS Real Time Network (prototype only) • 21 CORS Streaming near-real time observables • Stream Delays – 0.005 to 2.000 s • Uses NTRIP Caster to provide access • 15 GPS + GLONASS sites; 6 GPS only sites • Data format – RTCM 3.0, update to RTCM 3.1 in future • Data rate – 1 second • Data – L1 and L2 code and carrier observables, station ARP information and coordinates

  3. RTN Stream Access • 150+ users registered at NGS • 30 occasional users • Users typically access one stream • Usage is very limited • ** FAA, DGPS, NDGP CORS sites do not provide RTN streams

  4. Geometric Spacing • Sites are widely spaced • No possible error modeling for the following: • Ionosphere • Troposphere • Real Time Orbits • No plans to add/include sites for additional coverage

  5. RTN Applications • Surveying / Engineering • Machine guidance • Precision Agriculture • Mining • GIS • Scientific / Academic • Monitoring services • Others

  6. RTN Considerations • Precision / Accuracy • Reliability • Availability • Required Procedures • Interoperability of RTNs • Formats – streams • Applications

  7. RTN Expansion by NGS - Pros • Additional Coverage would aid some federal agencies and help support public and private RTN • Tie to the National Spatial Reference System (NSRS)

  8. RTN Expansion by NGS - Cons • Competition – Feds will not compete with private sector • Expensive to maintain network • Possible bandwidth issues at NGS (Caster site) • Communications costs for NGS • Administrative costs increase as you add sites • Each site provides limited coverage (25 – 75 km) • GPS only network • Very limited network coverage • Prototype project only

  9. Alternatives for Users • Use a private network. Several have national coverage • Fees – Vary between $1200 - $3000 per year • Most provide GPS + GLONASS solutions • Variety of services are offered • Most are tied to the NSRS

  10. Thank YouNeil D. Westonneil.d.weston@noaa.gov+1 301-713-3191

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