galileo kpi monitoring from nl, se and fi

GRC workshop, 03-03-2021

Hein Zelle, Heiko Engwerda (NLR)Octavian Andrei (FGI)

Maxime Mouyen (Chalmers)and others

Galileo KPI monitoring from NL, SE and FI

© Royal NLR, FGI, Chalmers, ASTRON 2021 - Consortium Use Only 2

This NLR document is company confidential to its recipients and should not be copied, distributed or reproduced in whole or in part, nor passed to any third

party without prior written consent of the project consortium NLR, Chalmers, FGI and ASTRON.

Use, intentionally or unintentionally of any of the content, information, or services in this document in a manner contrary to the objective of this document

is not allowed.


Overview

• Project “GRC Grant”

• Data delivery

• KPI computation

• KPI results

• What’s next

Project overview



Consortium

• NLR project managementground network data (NL)aircraft data

• Chalmers ground network data (SE)KPI developmenttiming KPI’s

• FGI ground network data (FI)KPI statistics and presentationPerformance analyses

• ASTRONSIS monitoring (NL)SIS KPI development

Data delivery


CountryParameter

The Netherlands Sweden Finland

Sensor stations 41 20 20

RINEX translator gfzrnx-1.13-7761 convertToRINEX JPS2RIN v.2.0.199

Receiver TRIMBLE NETR9 (16)LEICA GR50 (22)SEPT POLARX5E (3)

TRIMBLE NETR9 (17)TRIMBLE ALLOY (3)

JAVAD TRE_3 DELTA

Firmware v5.45 (v5.37)V4.31/7.403v5.3.2

v5.45 v3.7.7

Antenna LEIAR20 LEIMLEIAR25.R4 LEITTPSCR.G3 TPSHAOAD/M_T DUTD

LEIAR25.R3 LEIT JAVRINGANT_DM SCIS

Constellations GREC+S GREC+S GREC+S

Galileo signals E1B E5a E5b E5a+E5bE6

E1B E5a E5b E5a+E5bE6

E1B E5a E5b E5a+E5bE6

Availability 99.60% 99.68% 99.66%

Latency (< 15 min) 99.30% 95.65% 98.55%

(As of January 31, 2021)

RingAnt-DM

Leica AR25

Availabilities (average since 2020 DOY 180)

Daily files: availability within 24h = 98.75 % (for data_DOY, computed at 22:30 on DOY+1)

Hourly files: availability within 15 minutes = 95.65 % (for data_DOY_HH, computed at data_DOY_HH:16)

Hourly files: availability within 24h = 99.68 % (for data_DOY_HH, computed at 20:30 on DOY+1, since November 2020: computed at DOY+1_HH)

The availabilities refer to when the data are downloaded from the Swedish GNSS service to Chalmers local machine. It takes another ~2 minutes to transfer the data to GRC’s SFTP)

Availabilities (average since 2020 DOY 180)

Daily files: availability within 24h = 99.6 % after

24h 100%

Hourly files: availability within 15 minutes = 99.3 %

Hourly files: availability within 24h = 99.78 %

The availabilities refer to when the data are

downloaded from the Netherlands Kadaster

service to NLR’s local machine. It takes another ~3

minutes to transfer the data to GRC’s SFTP)

Month FINNREF

2020-01 100.00

2020-02 100.00

2020-03 100.00

2020-04 100.00

2020-05 100.00

2020-06 100.00

2020-07 97.10

2020-08 98.87

2020-09 100.00

2020-10 100.00

2020-11 100.00

2020-12 100.00

Average 99.66

Daily file availability Hourly file availability

Month Availability Latency< 15 min

2020-01 99.87 NN

2020-02 99.86 NN

2020-03 100.00 NN

2020-04 99.96 NN

2020-05 100.00 NN

2020-06 100.00 NN

2020-07 96.98 NN

2020-08 98.58 98.25

2020-09 99.99 99.76

2020-10 100.00 96.85

2020-11 100.00 97.88

2020-12 99.99 99.99

Average 99.60 98.55

Prepared but not submitted backward

Daily & hourly availability: at the end of the monthHourly latency: within 15 min of the next hour

KPI computation



Galileo / GNSS KPIs

• Key Performance Indicators (KPIs)

• Galileo performance, not receiver performance!

Source: Septentrio, https://www.septentrio.com/en/insights/gnss-corrections-demystified [16-2-2021]

Signal in Space errors

User Equipment errors

KPI definition

User Equipment Error (UEE). The User EquipmentError is the satellite-to-user range error due to allresidual error contributions in the range domainthat are not under the direct control of the GNSSsystem.

The Signal in Space Ranging Error (SISE) is defined as thedifference of the satellite position and time as broadcast bythe navigation message and the true satellite position andtime, projected on the user-satellite direction.The Global Average SISE can be evaluated by computingthe instantaneous SISE at grid points evenly distributedover the satellite service area.

The User Equivalent Ranging Error (UERE) quantifiesthe distribution that describes the pseudorange errors ofa specific set of user receiver measurements. The UEREincludes the ... Signal-In-Space Range Error (SISE) and User Equipment Error (UEE).

Broadcast Group Delay (BGD), to compensate for specific satellite systematic delays between the different frequencies

Definitions taken from the Galileo OS SDD © Royal NLR, FGI, Chalmers, ASTRON 2021 - Consortium Use Only

SIS

UEE

Monthly overview UEE (from report)

User Equipment Error:

Stations in the Netherlands during Nov ‘20

Monthly overview SISE global average (from report)

Signal In Space Error (Global Average):

Scale 0-0.5m


Monthly overview UEE (from report)

User Equipment Error:

Stations in Sweden during Dec ‘20

19

Monthly overview UERE (from report)

User Equivalent Ranging Error:

Stations in Sweden during Dec ‘20 Previous slide

Monthly overview BGD (from report)

Broadcast Group Delay:


Monthly UEE for reference to the sites selection

VAE6JON6

Stations in Sweden during Dec ’20

UEE - 2 sites – 3 satellites- time series

JON6

VAE6

UEE [

m]

What’s next



Outlook for 2021 - 2022

• UEE / SISE and UERE implementation in RTKLib complete

• Timing KPIs (Onsala station)

• NeQuick performance monitoring

• Flight recording KPIs

Andrei C-O, Lahtinen S, Poutanen M, Koivula H, Johansson J. Galileo L10 Satellites: Orbit, Clock and Signal-in-Space Performance Analysis. Sensors. 2021; 21(5):1695. https://doi.org/10.3390/s21051695

NLR AmsterdamAnthony Fokkerweg 21059 CM AmsterdamThe Netherlands

p ) +31 88 511 31 13 e ) [email protected] i ) www.nlr.org

NLR MarknesseVoorsterweg 318316 PR MarknesseThe Netherlands

p ) +31 88 511 44 44 e ) [email protected] i ) www.nlr.org

Fully engagedRoyal Netherlands Aerospace Centre

galileo kpi monitoring from nl, se and fi

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