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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


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GPS/GLONASS (GG)Status (Single Sites/Nearest)


GPS/GLONASS (GG)Status (Network RTK)


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Network RTK Clusters



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Antenna Types


Antenna Types


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Antenna Types / RINEX


Antenna Types / RINEX


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January 15, 2009 NYSAPLS 2010 Conference 11

Antenna Types / RT


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Why do we need reference stations?

Errors in GPS

•Clock Errors

•Ephemeras

Without Reference StationsAccuracy From 6-11 Meters

•Multipath

•Atmosphere

Magnitude of errors can be

With Reference StationsAccuracy From .005 to 1Meter

Atmosphere

Reference Station

On known point Rover

gdetermined at known station and applied at rover position

Differential GPS (DGPS)

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Single Base RTK - Network RTK(NRTK)

Atmosphere

10k >10k

1cm +1ppm


Reference Station

Rover

1cm +1ppm

Rover

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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 +1ppmV: 20mm +1ppm


V: 20mm +1ppmppm 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.

RTN - Network RTK (NRTK)

Network Cell – Interpolated RTK Corrections using the Master/Auxiliary Concept (MAC)Observables from master station, and correction differences from auxillarystations


stations. Models correction differences among a cell (group) of stations..Modeled correctionscan reduce ppm error.

FOR MORE INFO... www.network-rtk.info/euler/euler.html

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Auxiliary Stations

Network RTK (NRTK)RTCM MAC(Master Auxiliary Concept)

Master StationMAX – Rover does the interpolation.

iMAX-central server does the interpolation and sends corrected data to the rover.

8/8 +

January, 2014 NYSAPLS Conference 17

Reference Coordinates and Correction DifferencesReference Coordinate and Raw GPS Observations

Network RTK Clusters


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RTN-Connection TermsConnections to the network via internetCell Modems, RTK Bridge Transceivers

User Authentication via standard protocol.pNTRIP (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

RTN- Data ProductsStandard RTCM formatsGIS (sub meter) and Survey (cm) level positioning productspositioning products. Nearest Site (single reference station)PPM error due to Ionosphere and Atmospheric Delays

Network RTK (NRTK) (multiple reference stations)


reference stations)PPM error reduced, RTK accuracy at greater distances from reference station.

Standard Data Formats, Non Proprietary

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NTRIP Mount Points



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National CORS – Time Series Plot


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H=h-NOrtho Ht = Ellipsoid Ht – GEOID HtOrtho Ht = 513.123 – (-29.25)Ortho Ht = 513.123 +29.25

•NAVD88 From CORSUsing GEOID12a

GPS Vector

HI

Ortho Ht = 542.373 [GPS/GEOID 12a]Leveled Ht = 542.347Difference = 2.8 cm’s


Ellipsoid

GEOID-29.25

513.123

542.373 GEOID12a

542.347Leveled

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http://www.ngs.noaa.gov/GEOID/GEOID12A/g2012Arme.txt

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Summary

Questions, Comments, Suggestions?

Steve [email protected] 485 1385


NYSDOTDesign Services Bureau,Land Surveying Section

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