The German National Project ICONAV
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1 Chart 1 ICNS Conference > The German National Project ICONAV > The German National Project ICONAV M. Schnell 1, U. Epple 1, D. Shutin 1, N. Schneckenburger 1, Thomas Bögl 2 1) German Aerospace Center (DLR) 2) Rohde & Schwarz GmbH & Co. KG
2 Chart 2 ICNS Conference > The German National Project ICONAV > What is ICONAV? 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
3 Chart 3 ICNS Conference > The German National Project ICONAV > Outline LDACS1 System Overview LDACS1 Extension Towards Navigation (LDACS-NAV) The ICONAV Project Conclusions and Future Work
4 Chart 4 ICNS Conference > The German National Project ICONAV > 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 GS - Forward link: pure OFDM - Reverse link: OFDMA combined with TDMA - LDACS1 supports data and voice communication
5 Chart 6 ICNS Conference > The German National Project ICONAV > 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 khz per LDACS1 FL/RL channel DME - Minimize interference to and mitigate interference from other systems - Compatibility testing with DLR lab demonstrator - First DFS labs are very promising - Additional DFS labs during SESAR P European wide cell planning considering DME interference onto LDACS1 - Cells can cover twice the expected 2020 traffic - Only half of available channels required Huge potential - Lowest data rate considered (robustness) for future growth L-DACS1
6 Chart 7 ICNS Conference > The German National Project ICONAV > LDACS1 System Overview LDACS1 Potentials - LDACS1 enables high-capacity aeronautical communications - Min. net data rate (FL+RL=overall): = 561 kbit/s - Max. net data rate (FL+RL=overall): = 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
7 Chart 8 ICNS Conference > The German National Project ICONAV > Extension Towards Navigation Basic Concept DLR Project LDACS-NAV - The LDACS1 communication system is a cellular network - Ground stations (GS) are separated in frequency - GS are synchronized to each other GS3 GS4 GS1 GNSS Backup (APNT) GS2 Continuously transmitting LDACS1 ground stations act as pseudolites
8 Chart 9 ICNS Conference > The German National Project ICONAV > Extension Towards Navigation Performance Bounds on Ranging With LDACS Schmidl-Cox Synchronization Freq. Domain: Synchronization Symbols Time Domain: Synchronization Symbols CRLB: Synchronization Symbols Mean Range Error [m] ~4.1 m ~230 m 10 0 ~4.1 m Carrier to Noise Ratio [db]
![10000 8000 6000 4000 2000 0 0 20 40 60 80 100 Flight Time [min] Power Distance, km](/docs-images/93/112664447/images/9-1.jpg "from/to B C D LDACS D LDACS C LDACS B LDACS A <960MHz 962MHz 965MHz 975MHz f A 60")
9 Chart 10 ICNS Conference > The German National Project ICONAV > Extension Towards Navigation Flight Measurement Campaign Elevation [m] Flight Time [min] Power Distance, km from/to B C D LDACS D LDACS C LDACS B LDACS A <960MHz 962MHz 965MHz 975MHz f A B C 43
10 Chart 11 ICNS Conference > The German National Project ICONAV > Extension Towards Navigation Ranging Results for Station A 24 Estimated Range 22 Range, km Estimated range Filtered estimate Interpolated GPS range GPS range measurement GPS seconds Flight Segment
11 Chart 12 ICNS Conference > The German National Project ICONAV > Extension Towards Navigation Ranging Results for Station A Zoom-in Estimated Range (Zoom-in) Range, meters Estimated range Filtered estimate Interpolated GPS range GPS range measurement , , , ,7 GPS seconds
12 Chart 13 ICNS Conference > The German National Project ICONAV > Extension Towards Navigation Ranging Results for Station A Error Distribution Filtered OFDM ranges Snapshot length: 80s Traveled distance: 9 km ,3% Ranging performance: σ = 10 m µ = 4.1 m Counts Range error, meters
13 Chart 14 ICNS Conference > The German National Project ICONAV > The ICONAV Project Project Facts - German national project co-funded by Ministry of Economy - Time frame: Jan 2012 March 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
14 Chart 15 ICNS Conference > The German National Project ICONAV > The ICONAV Project Project Goals - 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
15 Chart 16 ICNS Conference > The German National Project ICONAV > The ICONAV Project Hardware Implementation - 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 MHz - Reverse link MHz - Transmit power 500 W (peak) - Optimization for protection against interference, robust receiver - Optimization for protection of other systems, low-noise transmitter
16 Chart 17 ICNS Conference > The German National Project ICONAV > The ICONAV Project Hardware Implementation WFDE Digital Unit
17 Chart 18 ICNS Conference > The German National Project ICONAV > The ICONAV Project Current Status ICONAV and LDACS-NAV 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
18 Chart 19 ICNS Conference > The German National Project ICONAV > 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
19 Chart 20 ICNS Conference > The German National Project ICONAV > Thank You!
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