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Combined Processing of GPS, GLONASS, and SBAS Code Phase and Carrier Phase Measurements. Lambert Wanninger, Stephan Wallstab-Freitag Geodetic Institute, Dresden University of Technology, Germany. ION GNSS 2007, Session D2.

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Lambert Wanninger, Stephan Wallstab-Freitag

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Lambert wanninger stephan wallstab freitag

Combined Processing of

GPS, GLONASS, and SBAS

Code Phase and Carrier Phase Measurements

Lambert Wanninger, Stephan Wallstab-Freitag

Geodetic Institute, Dresden University of Technology, Germany

ION GNSS 2007, Session D2


Gps glonass sbas

GPS+GLONASS+SBAS

  • Maxim: The more satellites the better.

  • but several differences:

  • reference systems (GLONASS)  transformation

  • orbit accuracy (GLONASS, SBAS)  weighting

  • observation quality (GLONASS, SBAS) weighting

  • inter-channel biases (GLONASS) algorithm, estimation


Orbit accuracy gps glonass

Orbit Accuracy GPS/GLONASS

Broadcast

orbit accuracy

(source: JPL, IGS)

Precise IGS orbits

GPS (final): <5 cm

GLONASS: 15 cm


Observation quality gps glonass

Observation Quality GPS/GLONASS

Code Observations: Elevation dependence of MP1

Station 1 / Receiver 1

Station 2 / Receiver 2

Proper weighting required  receiver dependence


Gps glonass sbas1

GPS+GLONASS+SBAS

Observation Equations for

Single-Difference Carrier Phases

GLONASS inter-channel bias difference [cm]:


Glonass inter channel bias diff

GLONASS Inter-channel Bias Diff.

Double-Difference Residuals L1

GPS

GLONASS

GLONASS

GLONASS

inter-channel

biases removed


Glonass inter channel bias diff1

GLONASS Inter-channel Bias Diff.

Long-term Stability

L0 – iono.-free linear combination


Glonass inter channel bias diff2

GLONASS Inter-channel Bias Diff.

  • Temperature effects

  • Chilling:

  • 20° Celsius temperature difference

  • no effect

    but

    change of antenna affects

    inter-channel bias difference

L0 – iono.-free linear combination


Glonass inter channel bias diff3

GLONASS Inter-channel Bias Diff.

A priori values of [cm]


Baseline results gps glonass

Baseline Results GPS/GLONASS

RTK-like processing:

short baseline, 2 minutes of observations


Lambert wanninger stephan wallstab freitag

SBAS

  • Code and carrier phase

  • observations to

  • GEO satellites

  • presently

  • 10 SBAS satellites,

  • 4 over Europe,

  • just single-frequency

  • EGNOS

  • presently:

  • poor broadcast orbits+clocks

  •  short baselines only


Observation quality gps sbas

Observation Quality GPS/SBAS

Code observations:

elevation dependence

of MP1

dual-frequency GPS MP1

single-frequency GPS MP1´

single-frequency SBAS MP1´


Lambert wanninger stephan wallstab freitag

SBAS

RTK-like processing:

short baseline, 2 minutes of observations,

dual-freq. GPS, single-freq. SBAS

 single-frequency SBAS improves dual-frequency GPS


Sbas carrier phase multipath

SBAS Carrier Phase Multipath

Double-difference residuals L1:

short static baseline, 2 SBAS satellites

daily multipath pattern, but also changes in pattern:

due to daily repetition of orbits, orbit maneuvers


Summary outlook

Summary + Outlook

  • GLONASS

    • lower orbit accuracy

    • some receivers: lower accuracy of code observations

    • inter-channel biases

  • SBAS

    • presently + EGNOS only: very poor orbit accuracy

    • lower accuracy of code observations

    • single-frequency only

  • Bright future

    • GPS L5, dual-frequency SBAS

    • more GPS/GLONASS/SBAS satellites

    • Galileo / Compass / GLONASS CDMA

  • A bird in the hand is worth two in the bush.


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