GNSS test receiver: Interference case study

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GNSS TEST RECEIVER: INTERFERENCE CASE STUDY

Marc Pollina

NI Aerospace & Defense Forum 2013

June, 13th 2013


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SOMMAIRE

www.m3systems.netM3Systems We Guide You J anvierr2013

M3 systemsGNSS context

Interference environment

DME/TACAN test caseVST based integrated test bench

Conclusions

Questions


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Company overview

Independent SME Started in 1999, nearby Toulouse 35 engineers

Turnover : 2.9M (2012)

Offices in Bordeaux and subsidiary in Belgium

Engineering services Satellite navigation (GNSS)

Air trafic management

Innovation R&D activity Radio-navigation technologies (GNSS, hybridization)

futures navigation applications(military, transport, aerospace)

Products

airport (e-TrackAir) Galileo receiver & signal generator
http://www.oseo.fr/


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Autonomous vehicle

R&D project

CTS-SAT project (DGCIS)

demonstration at La Cit de lEspace , Toulouse

(summer 2009)

TAXISAT project (FP7) :

demonstration at Francorchamp racing circuit in Belgium(summer 2013)


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Assisted GNSS for military application

Conception Achievement

Electronic

Mechan

ical


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Airport product: e-TrackAir

EGNOS based Navigation solution for airport vehiculeoperating in the manoeuvring area

Reduction of runway incursion risks

Record & Replay trajectories (runway inspection)

Generation of mission reports


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GNSS CON TEXT :

GAL I L EO &

M ULT I - CON STELLAT I ON



GALILEO IOV



GALILEO deployment



GNSS systems

GPS ( USA) operational since 1995 ( 30 satellites)

GLONASS (Russia) est nouveau oprationnel depuis 2010(29 satellites/22 operational)

GALILEO (Europe) under deployment , first services in 2015, fullyoperational in 2020 (30 satellites)

COMPASS(China) under deployment

IRNSS (India) geostationnary satellites


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RF signals for GNSS systems


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GNSS I N TERFEREN CE

EN V I RONM EN T


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Summary of main interference sources


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DME : 1151-1213 Mhz

GNSS Spectrum & DME


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DME/ TA CAN

I n t e r f e r e n c e t e s t c a se


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DME signal characteristics


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- Degradation of C/N0 ( Blue curve)

- Increased errors in pseudo-distance (Green curve)

- Loss of tracking in some test scenario

Impact of DME on GNSS receivers


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VST Ba s e d

I n t e g r a t e d GN SS t e s t b e n ch


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Reference model

Applications

NavigationEn h a n c e d N a v i g a t i o n

I n tg r i t y

PVT

BB signalprocessing

P o u r s u i t e Dm od u la t i o n

A c q u i s i t i o n

Co r rla t io n

RF processing

Hybridation

Interfacesd

ecommunicat

ion

Con

trle/Commande

Ca

pteurs

&

Assistance

Missions

NavigationT r a j e c t o g r a p h i e Rx

O r b i t o g r a p h i e

N a v i g a t i o n m e s sa g e s P r o p a g a t i o n

BB signal processingSi S I / Q g e n e r a t i on

RF processing

Inte

rferences

Con

trle/Comma

nde

Simulateur Navigateur

E

rreurs


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GNSS receiver modules

GPS GLONASS

tracking & data demodulation

GALILEO BEIDOU

Correlation

E6E1/L1

Front End

E5/L5 L2

Couche PVT

Hybridization multi-constellations

Canal

Canal

Canal

Canal

Canal

Time

synch

Time & position

RF Signals

Rawdata &internal

data: Canal

Canal

Canal

Canal

Canal

Canal

Canal


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Integration of GNSS IPs into the VSTplatform to provide modular & configurablesolutions :

log & replay

signal generation

open receiver

GNSS functions integration

22 octobre 201222 octobre 2012

Intgrated GNSS testbench

Existing IP (FPGA

Spartan 6)


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VST B d GNSS T t b h


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HIGH LEVEL OF RF PERFORMANCESFOR RECEPTION AND TRANSMISSIONALLOWING TO COVER THE WHOLE GNSSSPECTRUM;

RADIO-SOFTWARE APPROACH THATENABLES HIGH FLEXIBILITY ANDMODULARITY THROUGH LABVIEWENVIRONMENT;

FPGA CAPABILITIES TO ACCESS HIGHREAL TIME PERFORMANCES IN

PARTICULAR TO IMPLEMENT LOW LEVELPROCESSING CAPABILITIES (E.G.,DEMODULATION AND CORRELATION).

VST Based GNSS Test bench

Hi h l l f b bilit


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High level of observability


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CONCLUSI ON S

Integrated test bench concept


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VST technology enables high performancesoftware radio implementation

M3 Systems is using these capabilities tocover multiple GNSS use cases

We open the way towards affordable &configurable solutions to support GNSS

research & industry.

Integrated test bench concept


Key features


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Analyse real signals (log & replay)

Generate GNSS signals, includinginterferences

Assess receivers performances,including innovative algorithms

Flexible & modular : multi-constellation& multi-frquency by softwareconfiguration

Key features


Documents

GNSS test receiver: Interference case study