NavCom Lab SMLF (Signal Monitoring Laboratory Facility), la piattaforma TAS-I per il supporto alla...

8/14/2019 NavCom Lab SMLF (Signal Monitoring Laboratory Facility), la piattaforma TAS-I per il supporto alla verifica del segnale di Galileo

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NavCom Lab SMLF:NavCom Lab SMLF:--

verifica del segnale di Galileo.verifica del segnale di Galileo.. , . , .. , . , .

Presented by: SALVATORE CORVOresented by: SALVATORE CORVO

All rights reserved2007, Thales Alenia Space

BU NAV


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Content

Overview on TAS-I NavCom Laboratory

GNSS (SMLF) Signal Monitoring Facility

Antenna

Down Converter

SMFL SISA SW CONCLUSION


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Forum Aerospazio e Difesa 2009 2


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Introduction

under responsibility of B.U. Navigation &

Space Italia S.p.A.

system engineering activities in charge of TAS-I

The sco e of the NavCom Lab is twofold:

1) to support the growth of the system engineering competences in the

Navigation domain2) to represent an experimental platform for the fine tuning of the Galileo

system verification tests


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Main Objectives and Functions of NavCom Lab

Hardware Prototyping for Application development & exploitation that includes adequate tools to develop navigationhardware prototypes and to test applications at experimental stage.

The GNSS Flexible Signal In Space Simulation that is to be able to generate any type of Navigation signal taking intoaccount all the effects impacting on signal propagation from the satellite to the ADC output of the receiver.

The UERE Budget Characterization algorithms: it is designed to provide a verification platform where the UERE (UserEquivalent Range Error) budget contribution can be isolated and characterized.

The Orbit Determination Algorithms. This facility will analyze, define and implement the algorithms for the GNSS SatellitesOrbit Determination.

Augmentation and Interoperability Scenarios: Analysis, Prototyping and Tests. The activities that will be supported by theNavCom Lab are:

Systems Data Fusion, to experiment possible applications of GNSS, inertial sensors or cartographic data fusions;

Indoor Seamless Navi ation S stem IndoSenS, to develo solutions for in-door a lications of navi ation s stems

Web Portal to exchange products from TAS-I and TAS-F BUNAV Laboratories and to share any available NavCom Lab rawdata, measurements and analyses results to enabled users

The GNSS Signal Monitoring Laboratory Facility (SMLF) that has been designed to allow tracking of the GNSS satellitesfor monitoring of the RF and Code & Data characteristics of GNSS SIS implementing both real-time and post-processinganalysis of the GNSS signals received on ground.


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Analysis & Algorithm Development Lab

In the Analysis & Algorithm Development Room will be implemented the

following functionalities:

6600.00 mm.x 4000.00 mm.

Stanza

C

Meteo

Station


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Analysis & Algorithm Development Lab

In the Analysis & Algorithm Development Room will be implemented the


System Engineering Data &Configuration Management;

UERE budget characterization;

SynchroNet;

6600.00 mm.x 4000.00 mm.

Stanza

Galileo Signal Acquisition & Tracking

algorithms;C

Meteo

Station

GNSS Bit-True Signal Simulator;

Web Portal;


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Measurements & Platform Development Lab

In the Measurements & Development Room will be implemented the


R

Firewall

7

5

612

11

10 8

42

1

9

3

Atomic

Clock

ER

Firewall

7

5

612

11

10 8

421

9

3

Atomic

Clock

VSG Network

Analyser

Spectrum

S

ERVE

Me

Sta

SERV

Oscilloscopio

Spectrum

Bit Grabber

Database

Steo

tion

Oscilloscopio Spectrum

Meteo

tation

GPS/GALILEO

Riceviers


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Measurements & Platform Development Lab

In the Measurements & Development Room will be implemented the


Signal Monitoring

In-Door Seamless Navi ation ERFirewall

7

5

612

11

10 8

421

9

3

Atomic

Clock

VSG Network

Analyser

Spectrum

System (InDoSeNS)System Data Fusion

SERV

Oscilloscopio

Spectrum

Bit Grabber

Database

S

Collection of main weatherparameters

Oscilloscopio Spectrum

Meteo

tation

GPS/GALILEO

Riceviers


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GNSS Signal Monitoring Laboratory Facility

Simultaneous operations of three independent measurement

Real-Time Signal Analysis (Green Block):-

Characterization (i.e. Spectrum of modulatedsignal Equivalent Isotropic Radiated Power(EIRP), Nominal Power Level, OccupiedBandwidth, Frequency Stability (if possible),Carrier-to-Noise Ratio C/N0, intra-band andout of band emission).

User Analysis (Blue Block): that allowsevaluation on Raw data, Navigation Messages, BER, Doppler, Cycle slips Signal quality,

Signal status, SNR,.

Post-Processing Signal Analysis (Orange Block): it allows a SW analysis in a postprocessing way. Several investigation like signal rate, Code and carrier phase, received phasenoise, are carried out.


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SMLF High Gain Steerable Antenna

The antenna system, operating in the L-Band, is an high efficient prime focus feed 5.1m-reflector- - .

antenna main reflector is a 5.1m axially symmetric parabolic surface made from Fibre Glass.

Antenna type 5.1 m parabolic antenna,rime focus

Receivefrequency L-Band 1100 1600 MHz

Polarization RHCPOverall G/ T at E5 11.5 dB/K to zenith;

. owar s or zon

Sidelobes -24 dBAxial ratio 1.8 dB max

LNA Gain 35 dB

LNA N/ F 1 dB max

Band 1.1 GHz 1.35 GHz 1.6 GHzGain 32.6 dBi 34.4 dBi 35.9 dBiB W 4 deg 3 7 deg 2 75 deg

The RF signals is amplified by a set of two cascaded low-noise amplifiers (LNA)with a total gain of 100 dB and a noise figure of 1 dB.

B.W. 4deg 3.7 deg 2.75deg


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SMLF satellite visibility analysis

The scope is to guarantee a spectra discrimination of the usefultrac e s gna a eo or w t respect to ot er sate tessatellites)

The simulations have been carried out considerin the minimumangle between the projection of two specific satellite to a fix point in

the ground corresponding to SMLF Antenna.


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Minimum angular distance between Galileo SV03 and the remaining SVi Galileo and GPS


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This analysis has been done to establish how long (in time percentage) the Galileo 5.1m antenna is able totrack a selected satellite, considering a prefixed threshold of 3 degree on the antenna beam


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It can be noted that, for the maximum threshold (4 [email protected] worst cases) for the Galileosystem the availability of the verification service is approximately of 96% of the visibility time and 92%

for the GPS system


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Antenna Control System

The pointing system is driven by a,

motion and the satellite tracking, with0.001 degree of resolution and an overall

accuracy of 0.02 degree

The tracking pedestal is an elevationover-azimuth heavy-duty and highdynamic tracking pedestal.

It is characterized by dual drive design -two brushless servomotor and will carry

The tracking controller software, developed by

.gust and 180 Km/h Survival

TAS, uses satellites ephemeris data, extractedfrom Galileo/GPS receivers to control the ACU.Data are processed and converted into theACU format


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Down Converter

The down converter device guarantees system flexibility and modularity in term of bandand intermediate output frequency selection.

92 MHz 42 MHz 42 MHz

10 MHz external10 MHz externalreference providedreference provided

by an Activeby an Active


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Data Recorder and Data Storage

The SMLF BitGrabber is a digitizer, combined with data recorder and storage system steered by a- ,

with National Instruments COTS:

The system is composed of an high-speed digitizer, features two 100-

100 MHz bandwidth. It is based on the PXI Express technology and theoperative frequency (IF) is related to the down converter setting

direction per link) and a x1 PCI Express link to a PCI Express-to-PCItranslation bridge on the backplane.

The system accepts a system timing controller for advanced timing and synchronization (10 MHz of

external reference NavLab active H Maser) .

Since a sampling phase, the signal data flow passes, in real time, to external storage through the data

recorder, that provides recording and playback capability up to 600MB/s

Quad eSATA 4X connectors allows connection to external storage drive chassis or up to 8 individual

SATA disk drives with the a memory size 3TB


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SMLF SISA SW

The SMLF facility implements the capability to collect,collect, processprocess andand archivearchivehigh quality data and measurements from the tracked satellites.

Data types are three:

Samples of the satellites signal, gathered with several devices: I & Q samples from the Bit-Grabber, after the down converter (IF); I & Q sam les from the IF sam ler receivers

I & Q samples from the dedicated instruments, like vector signal analyzer SW with suchoption

Raw Data: the observables seudo-ran es carrier hase C/N0 etc from theGalileo/GPS receivers, connected both to the L band Steerable antenna dish and to theuser antenna;

Measurements of basic arameters like ower level fre uenc stabilit occu iedbandwidth, Spectra shaping and PSD, taken from the instruments, such as spectrumanalyzer and vector analyzer, including also a frequency meter and a power meter.


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SMLF SISA SW

-3

-2

-1

0

1

2

3

4x 10

4 Tracking of B channel

I

Q

0 10 20 30 40 50 60-4

Time [ea ch point corresponds to 2ms]

-1

0

1

2

3

4x 10

4 Tracking of C channel I

Q

0 10 20 30 40 50 60-4

-3

-2

Time [each point corresponds to 2ms]


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Laboratory Equipment

Galileo/GPS RECEIVERSSeptentrio PolaRx2 supports reception of L1 and L2 signals

Javad LEXON GGD 50 channels of single frequency

GPS and GLONASS with raw data and position solution

Septentrio GeNeRx1 is a 54-channel dual-constellation multi-

attractive, sturdy, and watertight box.

,

Galileo L1, E5a, E5b, E5 (AltBOC) and E6 signals, and providesdetailed measurements and data for all tracked signals. GeNeRx1 canoperate in dual constellation GPS/Galileo mode as well as in Galileoonly mode.

The Septentrio PolaNt: a dual-frequency antenna for

precise positioning and surveying applications. Theantenna incorporates low-noise amplifiers.

The Novatel GPS-704X antenna offers access tomultiple Global Navigation Satellite Systems (GNSS)


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nc u ng , a eo an requenc es.


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Laboratory Equipment

The Symmetricon MHM 2010

1s 2.0E-1310s 5.0E-14100s 1.3E-141000s 3.2E-15Floor* 3.0E-15

Long term:


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Conclusions

The design of NavCom Lab SMLF is based on the acquired know-how in the frame of GIOVE-A/B experimentation campaign, GalileoIOV test campaign and Galileo System Evaluation Equipments

e s a e o guaran ees a con nuous s gna mon or ng oone GNSS satellite per time

characterization activities in the RNSS scenario

The final target is to create an asset to be made available for thecurrent and future Galileo activities concerning the performanceverification of the system and the evaluation of possible scenarios

about its evolution.


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Thank YouThank You

or our ttent onor our ttent on

SALVATORE CORVOSALVATORE CORVO

. . .

Via Saccomuro 24, I-00131 Roma (Italy)

Ph. Nr.: +39 06 4151.2282FAX Nr.: +39 06 4191.287

E-mail: [email protected]


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