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GALILEO IOV Results

IWG Meeting

05 Feb 2014, New Delhi, India

Verification before full System Deployment:

Verification of Space, Ground and User components and Interfaces prior to full system

deployment

Navigation Processing & Message Dissemination Capabilities

Analysis of System Performance with the

view to refine the FOC system

Signal in Space Ranging Error & User Equivalent Range

Error budget

Verification of Operational Procedures

IOV Mission Objectives

November 10, 2013

Galileo Space Segment for IOV3

GSAT0102

GSAT0101

GSAT0104

GSAT0103

12 GSS

Kourou TTC/ULS/GSS

Kiruna TTC

Redu TTC(TBD)

GSS/IOTS. Pierre &

Miquelon

GSS

Fucino GSS

Troll GSS

Reunion ULS/GSSNoumea

ULS/GSS

Kerguelen GSS

Jan Mayen

GSS

Galileo Ground Segment for IOV

Svalbard

ULS/GSS

4 ULS 3 TT&C1 IOT

4

November 10, 2013

Kourou

Launch Site

Kiruna TTC

Kourou

TTC-ULS

Redu IOT

SAT MANUFATURER

Fucino

GCC-I & GSS

Oberpfaffenhofen

GCC-D

ESCC CNES

ESCC ESOC

Galileo Ground Segment for IOV

Kerguelen GSS

Noumea

GSS/ULS/TTC

November 10, 2013

IOV SCHEDULE

6

May’13 Jun’13 Jul’13 Aug’13 Sept’13 Oct’13

12/03/2013

First PVT Start IOV

CampaignIOV

Review

PHM RAFS SYS UPGRADE PHM

PLANNED OUTAGE

Satellite Availability*

SIS (%)

Availability*

Navigation Message (%)

GSAT0101 100 100

GSAT0102 100 100

GSAT0103 100 100

GSAT0104 86.3** 78.8**

* Period: 14/05/2013 to 31/07/2013

** Outage on 14/06/13. Resumed signal broadcast 26/06/2013, navigation message on 01/07/13

November 10, 2013

IOV Results

7

POSITIONING

PERFORMANCE

November 10, 2013

1st Position Fix 12/03/2013 10:00 -11:00 UTC

November 10, 2013

-8 -6 -4 -2 0 2 4 6 8-8

-6

-4

-2

0

2

4

6

8

W-E [meters]

S-N

[m

ete

rs]

95th Percentile:5.9[m]50th Percentile:3.1[m]

GNOR (ESTEC, Noordwijk) Horizontal Accuracy 12-03-2013 10:00-11:00 UTC

Dual Frequency E1-E5a F/NAV

Ve

rtic

al P

osit

ion

Err

or

in [

m]

Time (UTC)Horizontal Position Error (West/East) in [m]

Ho

rizo

nta

l P

osit

ion

Err

or

(So

uth

/No

rth

) in

[m

]

Horizontal Accuracy: 5.9 m (95th Percentile) Vertical Accuracy: 11 m (95th Percentile)

Standalone Galileo Position Solution E1/E5a Dual Frequency Receiver

12th March 2013 10:00 – 11:00 UTC

Accuracy of 1st Position Fix at ESTEC

Position Fix established with Test User Receivers in real-time and with TGVF Reference Receivers off-line.

November 10, 2013

IOV Results

10

TIMING

PERFORMANCE

November 10, 2013

Galileo Timing User specs

The European GNSS Programmes 1

User Performance Specification

Frequency Accuracy

(expressed as a normalised frequency

offset relative to UTC, 2 sigma, over

any 24 h interval)

< 3 x 10-13

User UTC determination uncertainty

(2 sigma) < 30 ns

November 11, 2013

Navigation Timekeeping – critical for navigation

Stable and autonomous timescale

Synchronisation of ground facilities

Reference for satellite orbit and clock prediction

Internal time tagging

Metrological Timekeeping – necessary for Galileo Timing Service

Accurate timescale synchronised to UTC (modulo 1 second)

Implementation of ITU recommendations

(Legally) valid time-tagging of user position and time

Timing service for specialised users

The European GNSS Programmes 1

Core SystemPrecise Timing Facility (PTF)

ExternalTime Service Provider

Navigation and Metrological Timekeeping

November 11, 2013

UTC(k) and UTCpredicted vs. GST (MC)Early Results

The plot shows daily average of GST(MC) offset to the national real-time realizations of UTC, named

UTC(k). The offset UTC(k)-GST(MC) is measured using TWTFT and GPS CV techniques. The real time

approximation of UTC named UTCapprox is the average of the five UTC(k)’s predicted vs UTC.

November 11, 2013

Conclusions: Galileo IOV works (and it works very well….!)

Positioning Search And Rescue

Grey = 3 s/c

Black = 4 s/c

-20 -15 -10 -5 0 5 10 15 20

-15

-10

-5

0

5

10

15

20

<- West - East (m) ->

<-

So

uth

-

N

ort

h (

m)

->

95th Percentile:7.8[m]drms:4[m]

GUSN 23rd August - 3rd September 2013, GDOP<10 [mean GDOP = 4.5]

Dual Frequency Positioning Accuracy (PDOP <=5):

• Horizontal (95%)8 m in average

• Vertical (95%)9 m in average

Timing Accuracy:

10 nsec in avg

• 67% availability with 4 IOV S/C

• 96% availability after 1st FOC launch (6 S/C)

Timing

SAR Beacons Localisation Accuracy:

• Within 2 km (77% localisations)

• Within 5 km (95% localisations)

14

Conclusions

The first position fix with Galileo was obtained on the 12 March

2013.

The in-Orbit Validation Campaign of Galileo was initiated in May

2013 and has been completed end of Oct 2013

Almost 1 window of about 2 hours each day during which PVT

calculation based on Galileo-only is possible

IOV results are very satisfactory:

Ranging error < 3 m

GST-UTC offset < 11.77 ns

UTC dissemination accuracy < 12.16 ns

Horizontal, Vertical positioning error < 10 m

Availability and performance will increase as space and ground

segment are completed

The preparation for Early Services has started

15November 11, 2013