m.sc. in advanced communication and navigation satellite systems
DESCRIPTION
M.Sc. in Advanced Communication and Navigation Satellite Systems. Chapter of Rome. AFCEA’s International Student Conference 2009. SDR GNSS Receiver Acquisition Module LabVIEW Implementation. Lt. Pasquale Digregorio. Brussels, October 28 2009. SUMMARY. SUMMARY. - PowerPoint PPT PresentationTRANSCRIPT
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AFCEA’s International Student Conference 2009
Brussels, October 28 2009
SDR GNSS ReceiverAcquisition Module
LabVIEW Implementation Lt. Pasquale Digregorio
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Introduction : Workgroup
GNSS Ricever : Hw-based vs Sw-based
Acquisition Module : Hw e Sw approach
LabView : implementation
Results : real GPS signal acquisition
Conclusions
SUMMARY22
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Cpt. Francesco Bartolozzi
Cpt. Alberto De Sanctis
Gabriele Mariani
Lt. Efer Miotti
3
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RF to IF converter
Antenna GNSS
Acquisition Tracking Navigation
Code-phase Delta Doppler
ObservablesNavigation Data PVT
A/D converter
RF to IF converter
Antenna GNSS
Acquisition Tracking Navigation
Code-phase Delta Doppler
ObservablesNavigation Data PVT
SOFTWARSOFTWAREE
HARDWAREHARDWARE
SUMMARY44
A/D converter
Acquisition
SOFTWARESOFTWAREHARDWAREHARDWARE
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GPS signalLocal Code
Satellite in view (PRN code)
Delta Doppler
Code-phaseCode-phase
Search in 3 dimention space:
0 100 200 300 400 500 600 700 800 900 1000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1Acquisizione
Chip
Corr
ela
zio
ne
0 100 200 300 400 500 600 700 800 900 1000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1Acquisizione
Chip
Corr
ela
zio
ne ∆∆tt
GPS SiS
GPS Signal at the receiver
Reciver Local Code
Shifted local code
GPS SiS reachs the reciver after dt delay
SUMMARY55
Code-phaseCode-phase
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Search Space
1023 Chip
±10
KH
z
∆f = 500 Hz
∆τ = 1/fc ≈ 1μsFase Codice PRNF
req
. Do
pp
ler
SUMMARY66
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MODULO ACQUISIZIONE
Hw-Based
1023 Chip
±10
KH
z
∆f = 500 Hz
∆τ = 1/fc ≈ 1μsPRN code phaseF
req
. Do
pp
ler
SUMMARY77
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Sw-Based
1023 Chip
±10
KH
z
∆f = 500 Hz
∆τ = 1/fc ≈ 1μsPRN code phaseF
req
. Do
pp
ler
MODULO ACQUISIZIONESUMMARY88
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Computational issues
Fast Fourier Transform Parallel Code Phase Search Acquisition Algorithm
with high computing efficiency
Parametric Acquisition Configurable time and frequency bin size Trade-off : accuracy and sensitivity versus computational weight
MODULO ACQUISIZIONESUMMARY99
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Acquisition Module
MODULO ACQUISIZIONESUMMARY1010
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Parametric GUI
MODULO ACQUISIZIONESUMMARY1111
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MODULO ACQUISIZIONESUMMARY1212
SV N°22 SV N°2
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Acquired SV
MODULO ACQUISIZIONESUMMARY1313
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SV dynamicDoppler Shift (kHz)
-5
-4
-3
-2
-1
0
1
2
3
4
5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Sat.
MODULO ACQUISIZIONESUMMARY1414
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Pseudorange (ms)
0
0,2
0,4
0,6
0,8
1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Sat.
MODULO ACQUISIZIONESUMMARY1515
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Goals achieved: Implemented PRN Code generator
(test gold sequence properties) Acquisition module (Parametric function, FFT)
(testing with a Real digital GPS signal)
Future development: Tracking module Navigation solution module
MODULO ACQUISIZIONESUMMARY1616
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