The German National Project ICONAV - LDACS · The German National Project ICONAV Chart 1 ICNS...
Transcript of The German National Project ICONAV - LDACS · The German National Project ICONAV Chart 1 ICNS...
The German National Project ICONAV
Chart 1 ICNS Conference > The German National Project ICONAV > 23.04.2013
M. Schnell1, U. Epple1, D. Shutin1, N. Schneckenburger1, Thomas Bögl2
1)German Aerospace Center (DLR) 2)Rohde & Schwarz GmbH & Co. KG
What is ICONAV?
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ICONAV = Integrated COmmunication and NAVigation functionality for sustainable L-band use
Basis: LDACS1 Additional features HW implementation
Navigation interface Interface implementation DLR project LDACS-NAV
Outline
LDACS1 System Overview LDACS1 Extension Towards Navigation (LDACS-NAV) The ICONAV Project Conclusions and Future Work
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LDACS1 System Overview Main System Characteristics
- L-band Digital Aeronautical Communication System, Type 1 - One of two proposals for the future A/G communications link
- LDACS1 is a broadband system based on OFDM (4G technology) - LDACS2 is a narrowband, single-carrier system (2G technology)
- Possibility for inlay system between DME channels - Centralized communication via ground station - Cellular deployment concept - Duplex scheme is FDD - Multiple-access schemes
- Forward link: pure OFDM - Reverse link: OFDMA combined with TDMA
- LDACS1 supports data and voice communication
GS
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LDACS1 System Overview Inlay Concept
- Preferred deployment scenario – LDACS1 as inlay system for L-band
- OFDM as used within LDACS1 is well-suited for inlay approach
- 500 kHz per LDACS1 FL/RL channel - Minimize interference to and mitigate
interference from other systems - Compatibility testing with DLR lab demonstrator
- First tests @ DFS labs are very promising - Additional tests @ DFS labs during SESAR P15.2.4
- European wide cell planning considering DME interference onto LDACS1 - Cells can cover twice the expected 2020 traffic - Only half of available channels required - Lowest data rate considered (robustness)
DMEL-DACS1
DMEL-DACS1
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Huge potential for future growth
LDACS1 System Overview LDACS1 Potentials
- LDACS1 enables high-capacity aeronautical communications - Min. net data rate (FL+RL=overall): 291+270 = 561 kbit/s - Max. net data rate (FL+RL=overall): 1.32+1.27 = 2.59 Mbit/s - Well suited to serve modern ATM application and future needs
- Comparison with LDACS2 (overall): 115 kbit/s (70 kbit/s)
- LDACS1 foresees quality-of-service - Fast access to resources, both forward and reverse link - Low delays for application - Different priorities for different applications
- Highly flexible solution with “Long-term Evolution” capability of LDACS1 - Like LTE, extension towards higher performance - Scalability of physical layer design (OFDM)
- Integration of navigation functionality into LDACS1
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Extension Towards Navigation Basic Concept
- The LDACS1 communication system is a cellular network
- Ground stations (GS) are separated in frequency
- GS are synchronized to each other
GS1
GS4
GS3
GS2
Continuously transmitting LDACS1 ground stations
act as pseudolites
GNSS Back-up (APNT)
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DLR Project LDACS-NAV
0 5 10 15 20 25
100
101
102
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104
Carrier to Noise Ratio [dB]
Mea
n R
ange
Erro
r [m
]
Schmidl-Cox SynchronizationFreq. Domain: Synchronization SymbolsTime Domain: Synchronization SymbolsCRLB: Synchronization Symbols
Extension Towards Navigation Performance Bounds on Ranging With LDACS1
~4.1 m
~4.1 m
~230 m
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Extension Towards Navigation Flight Measurement Campaign
Distance, km
from/to B C D
A 60 50 30
B 30 28
C 43
02000400060008000
1000012000
0 20 40 60 80 100Flight Time [min]
Ele
vatio
n [m
]
<960MHz 962MHz 965MHz 975MHz
LD
AC
S C
LD
AC
S B
LD
AC
S D
LD
AC
S A
f
Power
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Extension Towards Navigation Ranging Results for Station A
Estimated Range Flight Segment
210870 210900 210930 210960
14
16
18
20
22
24
GPS seconds
Ran
ge, k
m
Estimated rangeFiltered estimateInterpolated GPS rangeGPS range measurement
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Extension Towards Navigation Ranging Results for Station A – Zoom-in
Estimated Range (Zoom-in)
210896,7 210897,7 210898,7 210899,7
15950
16000
16050
16100
16150
16200
16250
16300
16350
16400
GPS seconds
Ran
ge, m
eter
s
Estimated rangeFiltered estimateInterpolated GPS rangeGPS range measurement
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Extension Towards Navigation Ranging Results for Station A – Error Distribution
Filtered OFDM ranges Snapshot length: 80s Traveled distance: 9 km Ranging performance:
σ = 10 m µ = 4.1 m
-40 -30 -20 -10 0 10 20 30 400
1000
2000
3000
4000
5000
6000
Range error, meters
Cou
nts
99,3%
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The ICONAV Project Project Facts
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- German national project co-funded by Ministry of Economy
- Time frame: Jan 2012 – March 2015
- Project Partners - Rohde & Schwarz (project lead, HW implementation, frontend design) - Rohde & Schwarz SIT (R&S subsidiary, security branch) - German Aerospace Center (DLR, knowledge transfer) - University Passau (Institute of IT-Security and Security Law) - iAd GmbH (SME, HW implementation) - BPS GmbH (SME, RF frontend design)
- Strong relation to DLR internal project LDACS-NAV
The ICONAV Project Project Goals
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- Transfer LDACS1 knowledge (research, specification) into industry
- Optimize existing LDACS1 specification with respect to performance and industry requirements
- Supplement LDACS1 with additional features, e.g. data security
- Adjust LDACS1 specification to enable integration of navigation services (interface to navigation functionality)
- Develop and implement an industrial LDACS1 HW demonstrator
The ICONAV Project Hardware Implementation
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- Reuse existing R&S Waveform Development Environment (WFDE) - WFDE – Digital Unit:
FPGA based baseband processing - WFDE – Transceiver Unit:
New development for L-band
- Transceiver unit - details: - Full duplex transceiver - Forward link 960-1009 MHz - Reverse link 1048-1164 MHz - Transmit power 500 W (peak) - Optimization for protection against interference, robust receiver - Optimization for protection of other systems, low-noise transmitter
The ICONAV Project Hardware Implementation – WFDE Digital Unit
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The ICONAV Project Current Status ICONAV and LDACS-NAV
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ICONAV Project - Knowledge transfer almost finalized - Optimize specification almost finalized - Data security concept ongoing - Interface to navigation functionality ongoing - Demonstrator development ongoing LDACS-NAV Project - Prepare flight measurements finalized - Perform measurement campaign finalized - Evaluation of results ongoing - Develop integrity concept ongoing
Conclusions
- Combining communications with a navigation functionality in LDACS1 enables sustainable use of aeronautical L-band spectrum
- LDACS1 is well-suited to serve modern ATM application and future needs
- The German national project ICONAV is a big step towards industrialization of LDACS1 for combined Com/Nav functionality
- First results of the flight measurement campaign within the LDACS-NAV project are very promising
- Intensive exchange of results between the two projects
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Thank You !
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