NYSNET 11/28/2014 GPS/GLONASS (GG) January 2015 NYSAPLS Conference

Transcription

1 GPS/GLONASS (GG) January 2015 NYSAPLS Conference 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

2 GPS/GLONASS (GG)Status (Single Sites/Nearest) January 2015 NYSAPLS Conference GPS/GLONASS (GG)Status (Network RTK) January 2015 NYSAPLS Conference

3 Network RTK Clusters January 2015 NYSAPLS Conference January 2015 NYSAPLS Conference

4 Antenna Types January 2015 NYSAPLS Conference Antenna Types January 2015 NYSAPLS Conference

5 Antenna Types / RINEX January 2015 NYSAPLS Conference Antenna Types / RINEX January 2015 NYSAPLS Conference

6 January 15, 2009 NYSAPLS 2010 Conference 11 Antenna Types / RT January 2015 NYSAPLS Conference

7 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 Single Base RTK - Network RTK(NRTK) Atmosphere 10k >10k 1cm +1ppm Reference Station Rover Rover January 2015 NYSAPLS Conference

8 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 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... January 2015 NYSAPLS Conference

9 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

10 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 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

11 NTRIP Mount Points January 2015 NYSAPLS Conference January 2015 NYSAPLS Conference

12 January 2015 NYSAPLS Conference National CORS Time Series Plot January 2015 NYSAPLS Conference

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19 January 2015 NYSAPLS Conference NAVD88 From CORS Using GEOID12a H=h-N Ortho Ht = Ellipsoid Ht GEOID Ht Ortho Ht = (-29.25) Ortho Ht = Ortho Ht = [GPS/GEOID 12a] Leveled Ht = Difference = 2.8 cm s GPS Vector HI GEOID12a Leveled Ellipsoid GEOID January 2015 NYSAPLS Conference

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26 Summary Questions, Comments, Suggestions? Steve Roden NYSDOT Design Services Bureau, Land Surveying Section January 2015 NYSAPLS Conference