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1Geodetic Survey Division • EARTH SCIENCES SECTOR

DCB Estimation at NRCan:Status and Future Plans

Reza Ghoddousi-Fard

Workshop on GNSS Biases, Bern, Jan 2012

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2Geodetic Survey Division • EARTH SCIENCES SECTOR

Outline

• GPS Differential Code Biases estimation status at NRCan• A look at daily GPS DCB estimates • Receiver GPS P2C2 estimates• Monitoring station DCB using a TEC map• Future plans

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3Geodetic Survey Division • EARTH SCIENCES SECTOR

Regional SCH TEC mapping based on a single layer model

(GPS only)

~40 stations

P1P2~40 stations

P1C1~18 stations

P2C2

~40 stations

NRT~75 stations

Daily

DC

B

Averaged daily and weekly

Daily warning system

Operational

NRT Global SH TEC mapping

and DCB estimation

Not yet operational

~130 RT-IGS stations

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4Geodetic Survey Division • EARTH SCIENCES SECTOR

Current daily DCB estimation process at NRCan

• P1P2ASHTECH UZ-12 (17)AOA BENCHMARK ACT (6)TPS NETG3 ( 6)TPS NET-G3A (4)AOA SNR-12 ACT (3)AOA SNR-8000 ACT (2)ASHTECH Z-XII3T (1)JPS EGGDT (1)

• P1C1ASHTECH UZ-12 (17)TPS NETG3 (7)AOA BENCHMARK ACT (6)TPS NET-G3A (4)AOA SNR-12 ACT (3)AOA SNR-8000 ACT (2)ASHTECH Z-XII3T (1)

• P2C2TPS NETG3 (7)TPS NET-G3A (4) TRIMBLE NETR5 (3)TRIMBLE NETRS (1+2)TRIMBLE NETR8 (1)

GPS regional ionosphere modelling

GPS direct determination

GPS direct determination

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5Geodetic Survey Division • EARTH SCIENCES SECTOR

Daily GPS sat. DCB estimates

~5.6 m

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6Geodetic Survey Division • EARTH SCIENCES SECTOR

~1.2 m

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7Geodetic Survey Division • EARTH SCIENCES SECTOR

~ 0.7 m

Block IIF

Block IIR-M

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8Geodetic Survey Division • EARTH SCIENCES SECTOR

Receiver P2C2 estimates

* * * *

* Firmware update

*

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9Geodetic Survey Division • EARTH SCIENCES SECTOR

* * **

* Receiver changed from TPS NETG3 to TPS NET-G3A

+ +

+ Firmware update

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10Geodetic Survey Division • EARTH SCIENCES SECTOR

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11Geodetic Survey Division • EARTH SCIENCES SECTOR

Monitoring station DCB using a TEC map

TEC map

Observation Phase smoothed code

VTEC at IPPs and sat DCBsMoving weighted average

and stdof receiver DCB

iirL

ipprippr DCBmfVTECDCB

alg2TPS NET-G3A

alg3TPS NETG3

algoAOA

BENCHMARK ACT

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12Geodetic Survey Division • EARTH SCIENCES SECTOR

Future plans

• DCB estimation using global stations in operational mode• GLONASS DCB estimation

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13Geodetic Survey Division • EARTH SCIENCES SECTOR

Thank you!