GALILEO for Air Navigation Services? Dr. Pascal Truffer

Division Communication, Navigation & Surveillance; Skyguide; Swiss Air Navigation Services ltd.

Pascal Truffer, TNS 2 of 10

Guidelines for Aviation and ANSP (Air Navigation Service Provider)

•  safety commitment to highest practicable safety level

•  capacity increase capacity by optimising airspace, while safety level is maintained

•  sustainability optimise flight paths and approaches in order to limit noise and reduce greenhouse gas emissions

•  cost efficiency although GNSS multi constellation (GPS+GLONASS+GALILEO+...) might lead to limited terrestrial navigation systems, ground backup will still be needed.

Pascal Truffer, TNS 3 of 10

Satellite Systems in Navigation Today

•  Today we use GPS, but standalone GPS is not adequate for many applications in terms of integrity.

•  For En-Route GPS is standard, together with RAIM (Receiver Autonomous Integrity Monitoring) and INS (Inertial Navigation System) - no backup if GPS fails for a long time - 5+ satellites are needed for RAIM

•  For continental flights and terminal conventional navigation systems are used together with GPS + RAIM + INS

•  For approaches - GPS + RAIM together with barometer for vertical guidance - GPS + SBAS (Satellite Based Augmentation Systems), WAAS or EGNOS - GPS + GBAS (Ground Based Augmentation Systems), precision approaches - CAT II / III -> today with ILS (instrument landing systems)

Pascal Truffer, TNS 4 of 10

GNSS will have improved availability... ...through redundancy

GAO (The U.S. Government Accountability, "congressional watchdog" ) report issued on GPS sustainability and modernization

expected lifetime of GPS satellites II/II-A: 7.5 years II-R/RM: 10 years

probability of maintaining a nominal constellation (N=24)

committed probability 95%

2013

2012

2011

2010

Pascal Truffer, TNS 5 of 10

GPS Space and Control Clock and Reaction Wheel Performance Status CGSIC* Brief Lt Joe Riedesel (September 08)

*Civil Global Positioning System Service Interface Committee

X = not equipped

GNSS will have improved availability (cont.)

Pascal Truffer, TNS 6 of 10

Simulation with N=30 satellites Nominal constellation: N=24

GNSS will have improved availability (cont.) Typical airport in significant terrain (e.g. Lugano)

Pascal Truffer, TNS 7 of 10

GNSS will have improved integrity and continuity GALILEO provides warnings to users when it fails to meet certain margins of performance (safety-of-life service).

Other SBAS are restricted to certain areas. GALILEO shall be available worldwide.

Pascal Truffer, TNS 8 of 10

C/A

L1 (1575.42 MHz)

E6 (1278.75 MHz)

L2 (1227.6 MHz)

M PRS CS

E5b (1217.14 MHz)

L5 E5a E5b OS/GPS III

P(Y) L2C

M P(Y)

GNSS will become more robust... ...against unintentional interference

GPS and Galileo Signal Spectra Prepared by Chris Hegarty, MITRE

L5 (1176.45 MHz)

ARNS* ARNS*

*Aeronautical Radio Navigation Services

**Distance measuring equipment

DME** not protected

GALILEO GPS

Pascal Truffer, TNS 9 of 10

L1 Signal Spectra Prepared by Chris Hegarty, MITRE

1555 1560 1565 1570 1575 1580 1585 1590 1595 -100 -95 -90 -85 -80 -75 -70 -65 -60

Frequency (MHz)

Norm

alize

d Po

wer S

pect

ral D

ensit

y (d

BW/H

z) C/A-code

Galileo OS and GPS III

P(Y)-code M-code Galileo BOC (15,5)

GALILEO GPS

GNSS will become more robust (cont.)

Pascal Truffer, TNS 10 of 10

Conclusions

•  GALILEO will complement GNSS multi constellation.

•  GALILEO will help to improve the performance of GNSS, while safety remains at the highest practical level.

•  Availability will be improved through redundancy.

•  GALILEO has an integrated safety-of-live service.

•  GNSS will become more robust against unintentional interference.