PART 4 : Implementation.¶

• Table of contents
• PART 4 : Implementation.
  • 1 - Starting point.
    • .......
  • 2 - Acquisition.
    • .......
  • 3 - Tracking.
    • .......
  • 4 - Navigation Data decoding.
    • Delimit subframes.
    • Decode ephemeris and information within the frame.
  • 5 - Localization computation.
    • Satellite position.
    • 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.

Delimit subframes.¶

TestFindPreamble.vi
GenerateFrame.vi
FindPreamble.vi
ParityCheck.vi

Decode ephemeris and information within the frame.¶

Ephemeris.vi
BinaryArrayToDecimal.vi
twosComp2dec.vi

5 - Localization computation.¶

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

Satellite position.¶

The following figure gives the impairments affecting the range in case of the GPS system as well as the correction process :

Figure 4.... : Pseudo-range measurement extracted from [2]

SatellitePosition.vi
TestSatellitePosition.vi
Check_time.vi

Pseudoranges.¶

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
[2] Position Estimation Workshop, March 2016