PART 5 : Implementation.¶

• Table of contents
• PART 5 : Implementation.
  • 1 - Starting point.
    • .......
  • 2 - Acquisition.
    • .......
  • 3 - Tracking.
    • .......
  • 4 - Navigation Data decoding.
    • a - Delimiting subframes.
    • b- Decoding ephemeris and information within the frame.
  • 5 - Localization computation.
    • a - Satellite position.
    • b - Pseudoranges.
    • Least Square solution for position determination.
  • 6 - Complete UML Diagram of the receiver.

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1 - Starting point.¶

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LabVIEW
GPS signal of sampling frequency 38.192 MHz from CD [1] under GNSS_signal_records/GPSdata-DiscreteComponents-fs38_192-if9_55.bin
C/A code generation : CA_code.vi with subVI CA_generatorG1.vi CA_generatorG2.vi

2 - Acquisition.¶

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3 - Tracking.¶

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4 - Navigation Data decoding.¶

See the UML Diagram of Section 4 under : NavigationData.PNG.

a - Delimiting subframes.¶

The files involved are :
- FindPreamble.vi
- TestFindPreamble.vi
- GenerateFrame.vi
- ParityCheck.vi

Figure 5. : Cross-correlation between navigation frame and local preamble. Figure 5. : Subframes with index of delimitation.

b- Decoding ephemeris and information within the frame.¶

The files involved are :
- Ephemeris.vi
- BinaryArrayToDecimal.vi
- twosComp2dec.vi
- ParityCheck.vi

5 - Localization computation.¶

See the UML Diagram of Section 5 under : Localization.PNG

a - Satellite position.¶

The files involved are :
- SatellitePosition.vi
- TestSatellitePosition.vi
- Check_time.vi

Figure 5. : Interface with ephemeris as input and illustration of the satellite position.

b - Pseudoranges.¶

The file involved is :
PseudorangesComputation.vi

Least Square solution for position determination.¶

LeastSquarePosition.vi
SatelliteRotationECEF.vi
toTopocentric.vi
CartesianToGeodetic.vi
TroposphericCorrection.vi

6 - Complete UML Diagram of the receiver.¶

References :
[1] K. Borre, D. M. Akos, N. Bertelsen, P. Rinder, S. H. Jensen, A software-defined GPS and GALILEO receiver