GPS/GLONASS (GG) January 2015 NYSAPLS Conference 2015 1 NYSNet 2015 GLONASS Upgrades Antenna Types Single Base/Network RTK GPS/GLONASS (GG) Single Base GPS/GLONASS (GG) Network RTK RT Products (NTRIP Mount Points) Tie to National Spatial Reference Network Positioning/Monitoring/Updating Heights Registering/Subscribing to products Station/Network Status January 2015 NYSAPLS Conference 2015 2 1
GPS/GLONASS (GG)Status (Single Sites/Nearest) January 2015 NYSAPLS Conference 2015 3 GPS/GLONASS (GG)Status (Network RTK) January 2015 NYSAPLS Conference 2015 4 2
Network RTK Clusters January 2015 NYSAPLS Conference 2015 5 January 2015 NYSAPLS Conference 2015 6 3
Antenna Types January 2015 NYSAPLS Conference 2015 7 Antenna Types January 2015 NYSAPLS Conference 2015 8 4
Antenna Types / RINEX January 2015 NYSAPLS Conference 2015 9 Antenna Types / RINEX January 2015 NYSAPLS Conference 2015 10 5
January 15, 2009 NYSAPLS 2010 Conference 11 Antenna Types / RT January 2015 NYSAPLS Conference 2015 12 6
Why do we need reference stations? Errors in GPS Clock Errors Ephemeras Multipath Atmosphere Without Reference Stations Accuracy From 6-11 Meters With Reference Stations Accuracy From.005 to 1Meter Atmosphere Reference Station On known point Rover Magnitude of errors can be determined at known station and applied at rover position Differential GPS (DGPS) January 2015 NYSAPLS Conference 2015 13 Single Base RTK - Network RTK(NRTK) Atmosphere 10k >10k 1cm +1ppm Reference Station Rover Rover January 2015 NYSAPLS Conference 2015 14 7
RTN Single Baseline RTK Nearest Site or Single Site Observables from a single station. Single Baseline Solution. Accuracy dependent upon receiver spec such as: H: 10mm +1ppm V: 20mm +1ppm ppm error partly due to atmospheric differences between reference and rover locations. The further away from the reference station the more atmospheric differences there may be between the reference station and the rover. January 2015 NYSAPLS Conference 2015 15 RTN - Network RTK (NRTK) Network Cell Interpolated RTK Corrections using the Master/Auxiliary Concept (MAC) Observables from master station, and correction differences from auxillary stations. Models correction differences among a cell (group) of stations.. Modeled corrections can reduce ppm error. FOR MORE INFO... www.network-rtk.info/euler/euler.html January 2015 NYSAPLS Conference 2015 16 8
Auxiliary Stations Network RTK (NRTK) RTCM MAC (Master Auxiliary Concept) 8/8 + Master Station MAX Rover does the interpolation. imax-central server does the interpolation and sends corrected data to the rover. Reference Coordinates and Correction Differences Reference Coordinate and Raw GPS Observations January, 2014 NYSAPLS Conference 17 Network RTK Clusters January 2015 NYSAPLS Conference 2015 18 9
RTN-Connection Terms Connections to the network via internet Cell Modems, RTK Bridge Transceivers User Authentication via standard protocol. NTRIP (Networked Transport of RTCM via Internet Protocol): A secure (login, password required) means of transmitting correction data via TCP/IP. Temporarily, to accommodate non-ntrip rovers, NYSDOT will provide access to RTCM by use of a NMEA user ID (GPUID) and password. NTRIP users will have access to all real time data products. GPUID users will have access to one real time data product. Rover must send in position using navigation standard format. NMEA Non Proprietary Connection Terms January 2015 NYSAPLS Conference 2015 19 RTN- Data Products Standard RTCM formats GIS (sub meter) and Survey (cm) level positioning products. Nearest Site (single reference station) PPM error due to Ionosphere and Atmospheric Delays Network RTK (NRTK) (multiple reference stations) PPM error reduced, RTK accuracy at greater distances from reference station. Standard Data Formats, Non Proprietary January 2015 NYSAPLS Conference 2015 20 10
NTRIP Mount Points January 2015 NYSAPLS Conference 2015 21 January 2015 NYSAPLS Conference 2015 22 11
January 2015 NYSAPLS Conference 2015 23 National CORS Time Series Plot January 2015 NYSAPLS Conference 2015 24 12
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January 2015 NYSAPLS Conference 2015 37 NAVD88 From CORS Using GEOID12a H=h-N Ortho Ht = Ellipsoid Ht GEOID Ht Ortho Ht = 513.123 (-29.25) Ortho Ht = 513.123 +29.25 Ortho Ht = 542.373 [GPS/GEOID 12a] Leveled Ht = 542.347 Difference = 2.8 cm s GPS Vector HI 542.373 GEOID12a 542.347 Leveled 513.123-29.25 Ellipsoid GEOID January 2015 NYSAPLS Conference 2015 38 19
http://www.ngs.noaa.gov/geoid/geoid12a/g2012arme.txt January 2015 NYSAPLS Conference 2015 39 January 2015 NYSAPLS Conference 2015 40 20
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Summary Questions, Comments, Suggestions? Steve Roden stephen.roden@dot.ny.gov 518 485 1385 NYSDOT Design Services Bureau, Land Surveying Section January 2015 NYSAPLS Conference 2015 51 26