AFCEAs International Student Conference 2009 Brussels, October 28 2009 SDR GNSS Receiver Acquisition...
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Transcript of AFCEAs International Student Conference 2009 Brussels, October 28 2009 SDR GNSS Receiver Acquisition...
![Page 1: AFCEAs International Student Conference 2009 Brussels, October 28 2009 SDR GNSS Receiver Acquisition Module LabVIEW Implementation Lt. Pasquale Digregorio.](https://reader036.fdocuments.us/reader036/viewer/2022062511/551a32d9550346545e8b4ac5/html5/thumbnails/1.jpg)
AFCEA’s International Student Conference 2009
Brussels, October 28 2009
SDR GNSS ReceiverAcquisition Module
LabVIEW Implementation Lt. Pasquale Digregorio
![Page 2: AFCEAs International Student Conference 2009 Brussels, October 28 2009 SDR GNSS Receiver Acquisition Module LabVIEW Implementation Lt. Pasquale Digregorio.](https://reader036.fdocuments.us/reader036/viewer/2022062511/551a32d9550346545e8b4ac5/html5/thumbnails/2.jpg)
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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