L2c data collection and analysis using a trimble r7 gps receiver
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L2C Data Collection and Analysis using a Trimble R7 GPS Receiver. Liliana S ü keova Department of Geodesy and Geomatics Engineering University of New Brunswick Fredericton, NB. Outline. Background and objectives. Project description. Observations and their analysis. Conclusion.

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L2C Data Collection and Analysis using a Trimble R7 GPS Receiver

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L2c data collection and analysis using a trimble r7 gps receiver

L2C Data Collection and Analysis using a Trimble R7 GPS Receiver

Liliana Sükeova

Department of Geodesy and Geomatics Engineering

University of New Brunswick

Fredericton, NB


L2c data collection and analysis using a trimble r7 gps receiver

Outline

  • Background and objectives

  • Project description

  • Observations and their analysis

  • Conclusion


Background

Background

GPS Modernization

a new open civil signal available on L2 frequency – L2C – currently broadcast by Block IIR-M satellites:

PRN 17 since 15.12.2005

PRN 31 since 12.10.2006

L2C signal tracking network

L2C capable GPS receivers deployed to existing and new stations

Trimble R7 receiver on loan to UNB

Establishing UNB3 as a part of the L2C tracking network


Objectives

  • General objective

    • to analyze the modernized L2C signal

  • Specific objectives

    • to establish a station using Trimble R7 receiver

    • to collect the data containing the new L2C observables

    • to test the receiver’s firmware version

Objectives


Project description

Project description

  • L2C signal tracking network

  • Trimble R7 at UNB

    • becomes a part of L2C tracking network

    • successfully tracks the modernized L2C signal


Project description1

  • Establishing UNB3

    • Trimble R7 connected to the same antenna used by IGS

      station UNB1 (currently UNBJ), by means of an antenna splitter

      (UNB, Fredericton, NB)

    • L2C data collection since January 11th, 2006

      until October 10th, 2006

    • 30 second daily files containing the new L2C uploaded to the

      site at the Crustal Dynamic Data Information System (CDDIS)

      ftp://cddis.gsfc.nasa.gov/gps/data/l2ctest/daily/2006/

Project description


Observations and their analyses

Observations and their analyses

  • Data processing

    • to create daily observation and navigation files program

      TEQC was used, v. 5.11.2005, provided by UNAVCO

    • to accommodate the new GPS L2C pseudorange

      observable a new code (C2) was defined in RINEX

      (v. 2.11) observation files.

    • The full command line reads:

      teqc +C2 -tr d +nav *.06n *.dat > *.06o


Observations and their analysis

Observations and their analysis

Signal-to-noise ratio on L1:

Signal-to-noise ratio on L2:


Observations and their analysis1

Observations and their analysis

C/A and P2 SNR – PRN 11

C/A and L2C SNR – PRN 17

70 deg

10 deg

10 deg

80 deg

10 deg

10 deg


Observations and their analysis2

Observations and their analysis

  • Compute code multipath and noise level

    • of C/A and L2C code pseudorange for PRN 17

    • of P2 and C/A code for PRN 11

  • code multipath and noise level =


Observations and their analysis3

Observations and their analysis

  • L2C and C/A code multipath and noise level – PRN 17, 16.01.2006

    • with the mean removed (offset by the carrier phase ambiguities)

,

stdL2C = 0.611 m

stdC/A = 0.270 m


Observations and their analysis4

Observations and their analysis

  • P2 and C/A code multipath and noise level – PRN 11, 16.01.2006

    • with the mean removed (offset by the carrier phase ambiguities)

stdP2 = 0.438 m

stdC/A = 0.314 m


Observations and their analysis5

Observations and their analysis

  • Analyses of code multipath and noise level

    • According to (Simsky et al., 2006) the same level of noise and multipath is expected on C/A and L2C

    • contrast with this assumption found in Trimble R7 => the firmware of Trimble R7 (v. 2.26, v. 2.28) does not combine CM and CL code wavelengths of the L2C signal


Observations and their analysis6

Observations and their analysis

  • Other incongruities in the firmware of Trimble R7

    • after processing data with GAPS -

      found an inconsistency between carrier-phase and

      pseudorange measurements => a cycle-slip-like effect

    • observations from consecutive days can not be used

      sequentially without re-initializing ambiguities for all

      satellites at each day crossover


Conclusions

Conclusions

  • More advanced signal structure of L2C code over the C/A code,

  • SRN of L2C is higher than P2 code, values similar to SNR of C/A code

  • Multipath and noise level of L2C is higher than that of C/A code - contrast with the assumption

  • inconsistency between carrier-phase and pseudorange measurements

    Current work:

  • Analysis of data collected with different antennas, receivers

    (from all tracking stations)

    Future work:

  • Analysis of simulated data sets of L2C signal with Spirent simulator


Acknowledgements

Acknowledgements

  • GEOIDE Network for funding

  • Cansel for loan of Trimble R7 receiver

THANK YOU


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