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Cycle Slips Detection in Quad-Frequency Mode:
Galileo’s Contribution to an Efficient Approach
under High Ionospheric Activity
1
Laura Van de Vyvere
vandevyvere@m3systems.eu
CLGE Students’ Contest 2015
Winner of the 2015 GSA-CLGE
Prize for Young Surveyors
Introduction Cycle slips
Quad-frequency
algorithm
Validation
Conclusion &
improvements
2
Position
Accuracy
3
Introduction Cycle slips Quad-frequency
algorithm
Validation
Conclusion &
improvements
Phase
measurements
PositioningCounter
What is a
cycle slip ?
4
Introduction Cycle slips Quad-frequency
algorithm
Validation
Conclusion &
improvements
Shift Shift
Phase
measurements
PositioningCounter
What is a
cycle slip ?
Introduction Cycle slips Quad-frequency
algorithm
Validation
Conclusion &
improvements
What is a
cycle slip ?
Shift Shift
Phase
measurements
PositioningCounter
How is it a
drawback to
precision ?
1 cycle = 20 cm
6
Introduction Cycle slips Quad-frequency
algorithm
Validation
Conclusion &
improvements
Different
cases
1 carrier
affected
multiple carriers
affected
Same
magnitude
Different
magnitude
How is it a
drawback to
precision ?
What is a
cycle slip ?
1 cycle = 20 cm
Shift Shift
Phase
measurements
PositioningCounter
7
Introduction Cycle slips Quad-frequency
algorithm
Validation
Conclusion &
improvements
Present day
methods :
limits and
weaknesses
Dual frequency
Triple frequency
Quad frequency ?
Different
cases
1 carrier
affected
multiple carriers
affected
Same
magnitude
Different
magnitude
How is it a
drawback to
precision ?
What is a
cycle slip ?
1 cycle = 20 cm
Shift Shift
Phase
measurements
PositioningCounter
8
More carrier
frequencies
Measurements
precision
Efficient Thresholds
Reliable detection method
More testing
quantities
More stable
testing
quantities
Introduction Cycle slip
Quad-frequency
algorithm
Validation
Conclusion &
improvements
9
Introduction Cycle slip
Quad-frequency
algorithm
Validation
Conclusion &
improvements
Gabon
Japan
All cycle slips detected
Real
Simulated
Efficient in
harsh
conditions
Military
user
10
Introduction Cycle slip
Quad-frequency
algorithm
Validation
Conclusion &
improvements
Research Commercial
applications
Civil user
Quad-
frequency
CS detection
method
Efficient in
harsh
conditions
11
Introduction Cycle slip
Quad-frequency
algorithm
Validation
Conclusion &
improvements
Research Commercial
applications
Civil user
Military
user
Quad-
frequency
CS detection
method
Detection
Correction
Galileo Receiver
REAL-TIME
Continuous &
Corrected data
Thank you for your attention
12
Laura Van de Vyvere
vandevyvere@m3systems.eu
CLGE Students’ Contest 2015

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INTERGEO2015_Galileo cycle slips_Van de Vyvere

  • 1. Cycle Slips Detection in Quad-Frequency Mode: Galileo’s Contribution to an Efficient Approach under High Ionospheric Activity 1 Laura Van de Vyvere vandevyvere@m3systems.eu CLGE Students’ Contest 2015 Winner of the 2015 GSA-CLGE Prize for Young Surveyors
  • 3. 3 Introduction Cycle slips Quad-frequency algorithm Validation Conclusion & improvements Phase measurements PositioningCounter What is a cycle slip ?
  • 4. 4 Introduction Cycle slips Quad-frequency algorithm Validation Conclusion & improvements Shift Shift Phase measurements PositioningCounter What is a cycle slip ?
  • 5. Introduction Cycle slips Quad-frequency algorithm Validation Conclusion & improvements What is a cycle slip ? Shift Shift Phase measurements PositioningCounter How is it a drawback to precision ? 1 cycle = 20 cm
  • 6. 6 Introduction Cycle slips Quad-frequency algorithm Validation Conclusion & improvements Different cases 1 carrier affected multiple carriers affected Same magnitude Different magnitude How is it a drawback to precision ? What is a cycle slip ? 1 cycle = 20 cm Shift Shift Phase measurements PositioningCounter
  • 7. 7 Introduction Cycle slips Quad-frequency algorithm Validation Conclusion & improvements Present day methods : limits and weaknesses Dual frequency Triple frequency Quad frequency ? Different cases 1 carrier affected multiple carriers affected Same magnitude Different magnitude How is it a drawback to precision ? What is a cycle slip ? 1 cycle = 20 cm Shift Shift Phase measurements PositioningCounter
  • 8. 8 More carrier frequencies Measurements precision Efficient Thresholds Reliable detection method More testing quantities More stable testing quantities Introduction Cycle slip Quad-frequency algorithm Validation Conclusion & improvements
  • 9. 9 Introduction Cycle slip Quad-frequency algorithm Validation Conclusion & improvements Gabon Japan All cycle slips detected Real Simulated
  • 10. Efficient in harsh conditions Military user 10 Introduction Cycle slip Quad-frequency algorithm Validation Conclusion & improvements Research Commercial applications Civil user Quad- frequency CS detection method
  • 11. Efficient in harsh conditions 11 Introduction Cycle slip Quad-frequency algorithm Validation Conclusion & improvements Research Commercial applications Civil user Military user Quad- frequency CS detection method Detection Correction Galileo Receiver REAL-TIME Continuous & Corrected data
  • 12. Thank you for your attention 12 Laura Van de Vyvere vandevyvere@m3systems.eu CLGE Students’ Contest 2015