GIOVE Workshop 131008 12

8/14/2019 GIOVE Workshop 131008 12

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1

GALILEO Perform anc e

Val idat ion w i t h GIOVE

J . Hahn / S. Binda

Gal i leo Projec t Of f ic e

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2

Risk Mitigation

What does “Risk Mitigation” mean?

1. Validate key assumptions taken during the design phase

using real in-orbit measurements2. Validate space and ground H/W pre-developments and

feedback manufacturers to take results into account in theSystem Preliminary CDR of the IOV phase

3. Take into account lessons learnt in the FOC ITT preparation

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Risk Mitigation: 1. Design Assumptions

• Galileo Signal In Space design is on track as confirmed bymeasurements on the field

• On board clock performance specification appears feasibleand with margin (quiet conditions)

• Sensor station tracking error specification for Galileo SensorStations is confirmed

• Corresponding models extracted from GIOVE data have

been provided to GMS for Raw Data Generator validation• System Performance Budget File will be updated accordingly

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SOL

SF_E5/6 SF_L1 DF E5a E5b L1 E5a-L1 E5b-L1 E6 L1 E6-L1

Positioning Accuracy

SOL H 24m 15m 4m 30m 29m 16m 4m 4m -- -- --

V 35m 35m 8m 55m 51m 38m 5m 5m -- -- --

PRS H 24m 15m 6.5m -- -- -- -- -- 29m 16m 4mV 35m 35m 12m -- -- -- -- -- 42m 36m 6m

Velocity Accuracy

3D 13cm/s 13cm/s 20.3cm/s

Availability of Accuracy

nom 100%

comb WUL 99.5%

Integrity

SOL HAL -- -- 12m -- -- -- -- 12m --

VAL -- -- 20m -- -- -- -- 20m --

PRS HAL -- -- 20m -- -- -- -- -- 20m

VAL -- -- 35m -- -- -- -- -- 35m

Risk -- -- 2e-7 -- -- -- -- 2e-7 2e-7

SOL TTA -- -- 6s -- -- -- -- 6s --

PRS TTA -- -- 10s -- -- -- -- -- 10.1s

Continuity

Risk -- -- 8e-6 -- -- -- -- 8e-6 8e-6

Availability of Int & Contnom 99.3% 100%

comb 98.3% 99.4%

Coverage

w-w

--

world-wide world-wide

GSRD

23.1cm/s

100%

99.5%

--

--

100%

99.5% at WUL

world-wide

Development Status - S-PCDR

28.7cm/s

100%

99.5%

100%

99.5%

--

Non-CompliantPartial-CompliantCompliant

OS PRS

20cm/s

System Performance Status

100%

99.5%

12m

20m

--

--

2e-7

6s

--

8e-6

100%

99.7%

w-w

GIOVE MRD

100%

99.5%

40m

20m

--

--

2e-7

6s

--

8e-6

--

99.5%

w-w

GMS CDRresults notyet included(ongoing)

Service Level Status (@ S-PCDR KO)

1m SISA

GMS CDRStatus

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Link to Segment Drivers

DesignEquip.Level

Equip.

Level

SOCSOC

Status

SOL

SF_E5/6 SF_L1 DF E5a E5b L1 E5a-L1 E5b-L1 E6 L1 E6-L1

Positioning Accuracy

SOL H 24m 15m 4m 30m 29m 16m 4m 4m -- -- --

V 35m 35m 8m 55m 51m 38m 5m 5m -- -- --

PRS H 24m 15m 6.5m -- -- -- -- -- 29m 16m 4m

V 35m 35m 12m -- -- -- -- -- 42m 36m 6m

Velocity Accuracy

3D 13cm/s 13cm/s 20.3cm/s

Availability of Accuracy

nom 100%

comb WUL 99.5%

Integrity

SOL HAL -- -- 12m -- -- -- -- 12m --

VAL -- -- 20m -- -- -- -- 20m --

PRS HAL -- -- 20m -- -- -- -- -- 20m

VAL -- -- 35m -- -- -- -- -- 35m

Risk -- -- 2e-7 -- -- -- -- 2e-7 2e-7

SOL TTA -- -- 6s -- -- -- -- 6s --

PRS TTA -- -- 10s -- -- -- -- -- 10.1s

Continuity

Risk -- -- 8e-6 -- -- -- -- 8e-6 8e-6

Availability of Int & Cont

nom 99.3% 100%

comb 98.3% 99.4%

Coverage

w-w

--

world-wide world-wide

GSRD

23.1cm/s

100%

99.5%

--

--

100%

99.5% at WUL

world-wide

Development Status - S-PCDR

28.7cm/s

100%

99.5%

100%

99.5%

--

Non-CompliantPartial-CompliantCompliant

OS PRS

20cm/s

38 cm*

90 %

100 cm*100 cm*

10 %

*GMS-CDR Development Status

GIOVE:

45cm**

**GIOVE exp. confirmation

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Galileo: TWSTFT

GIOVE: broadcast nav msg

4.5 ns5.0 ns (2 sigma) (86400s)GGTO Offset

0.4ns / 24h

(overall process

performance)

0.3ns / 24h

(payload spec only)

SV Differential Group Delaystability of ranging signals

<16TECU30% or 20TECUSingle FrequencyIonospheric Algorithm

2 mm10 mmGSS Carrier Phase error

PC at elev. > 40deg0.83-0.350.81-0.21 mGSS Code Phase error

GIOVE: Orbit and ClockPrediction (33 cm / 2.0

ns, 1σ

)

0.9 m

(0.45 m, 1-σ)

1.3 mRanging Accuracy

(95 %)

CommentGIOVEGalileoRequirement

Note: strict requirement comparison is NOT possible.

GIOVE perspective on Galileo performance drivers

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GIOVE perspective on Galileo performance drivers

…………

PC due mostly to measurement systemnoise

300s: 2e-13

1000s: 9e-13

10000s: 3.5e-14

1s: 1.1e-12

10s: 3.5e-13

100s: 1.1e-13

1000s: 3.5e-14

10000s: 1.1e-14

PHM freq. stab.

Not in Galileo spec but still two order ofmagnitude better than RAFS

1e-14/day8.2e-15/dayPHM freq. drift

C if drift removedFrequency trend after switch-on typicalof the Rb technology300s: 2e-13

1000s: 1.5e-13

10000s: 9e-14

1s: 5.1e-12

10s: 1.64e-12

100s: 5.1e-13

1000s: 1.64e-13

10000s: 5.1e-14

RAFS freq. stab.

GIOVE: worst case - typical value 1e-12/day

1.8e-12/day1e-12/dayRAFS freq. drift

CommentGIOVEGalileoRequirement

Note: strict requirement comparison is NOT possible.

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Key Driver Traceability

Driver Spec

Design Status

Equipment level Verification Status

Microsoft Excel

Worksheet

DOORS

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Risk Mitigation: 2. Pre-developments H/W

Space H/W Predevelopments:• More than two years operation in orbit has allowed

full characterisation of the RF chain

• Frequency standards behaviour in orbitcharacterised and lesson learnt put in place in IOVspacecraft

Ground H/W Predevelopments:• Antenna’s multipath rejection and group delay

variation lesson learnt put in place

• Test User Receivers in-field measurements haveallowed to improve Front End capabilities

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Experimentation Results and Roadmap

Experimentation Results:• GIOVE-A from May 2007 to July 2008

• GIOVE-B from P/L switch-onMay 2008 to July 2008

Roadmap:

• GIOVE-A

(March 2009)• GIOVE-B

(July 2010)

7GPS to GST

Offset

OSPF2Satellite Clock

Characterization

RAFS/PHM,CMCU, OSPF

3Sensor Station

Characterization

GSS and GRC

5Iono + BGD

OSPF

6Calibration+ Validation

GSS,OSPF, GGSP

4Orbit Models

OSPF

1

Navigation Algo’sAssessment

OSPF

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ODTS & IONO Experimentation

Orbit Determination & Time Synchronisation experimentation:• Detailed ODTS pre-processing robustness analysis (cycle slips, codesmoothing)

• ODTS performance vs observable combination (L1C-E5b and L1C-E6Chas been used)

• IONO: evaluation of NeQuick model v1, Single Frequency Iono algo,disturbance flags, and extension of inter-frequency bias analysis to othercode combinations (L1C-E5b and L1C-E6C analysed)

• Comparison of L-band-only with SLR-only orbit for calibration purposes (adense SLR campaign is needed)

Roadmap• ODTS: preprocessing of existing Antenna effects (elevation dependant GD

and phase centre variations), SV manoeuvres handling

• Orbit models: alternative solar radiation parameters models, performanceover eclipses

• IONO: evaluation of NeQuick v2 model, disturbance flag refinement, andconsolidation of inter-frequency and inter-system bias analysis

• Comparison of L-band-only with SLR-only orbit for calibration purposes(e.g. better determination of SV/GESS IFB)

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On-Board Clock Experimentation

On Board Clock Characterization experimentation:• Definition and testing of an operational clock initialization procedure,involving GSCs, both for GIOVE-A and -B

• Accurate evaluation of stability (short, medium, long term) based on along period of observation done for GIOVE-A

• Stability and suitability of the H maser ground reference clock as externaltime reference to a GESS (GIEN and GUSN master clocks)

• Effects of Radiation on clocks investigated

Roadmap

• Accurate evaluation of stability (short, medium, long term) based on a

long period of observation of the PHM• Stability and suitability of the H maser ground reference clock as external

time reference to ESTEC GESS

• Deliver Time Deviation estimates

• Confirm using experimental data the impact ofrelativistic effects

• Use onboard RAFS-PHM phase toroutinely steer the RAFS

• Confirm Radiation effects on

GIOVE-B using SREM

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Sensor Stations Characterisation

Sensor Station Characterization experimentation:• Assessment of PRS (L1A and E6A) partially done

• Exploit diversity of sensor stations sites, building correlation between :

Site environment as assessed in the site survey reports

Station output data quality performances

• Synthesis activities, including in particular :

Building Galileo Sensor Station models

Full consolidated comparison between GPS and GALILEO

Final extrapolation to Galileo

Roadmap• GIOVE-A vs GIOVE-B sensor station error budget

• Consolidation of Sensor Station Error Budget including new receivers(OS/CS and SoL GSS like)

• Consolidation of comparison between BOC/CBOC/TMBOC

• Characterisation pulse blanking effectiveness

• Specific analysis on the impact of the ionospheric scintillation on thereceiver performance

• Consolidate the impact of GMS preprocessing on tracking performance

• Complete assessment of PRS (L1A and E6A)

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Bi-lateral Cooperations

Areas of cooperation with external entities/institutes:• Diversify Galileo Experimental

Sensor Stations(improved version includingupgraded computer NovAtel RXand TAS-I RX based on IOV GSS)

• User base increased to around60 people from industrial/academicorganisation

• Application from Portugal, Canada,Poland for the attachment of GESSreceived

Roadmap• Increase the number of GESS stations

• Increase the number of data user

• Share GESS data and cross-validate experimentalCore Products

8/14/2019 GIOVE Workshop 131008 12


GIOVE Workshop 131008 12

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