GBAS Interoperability and Multi-constellation/Multi-frequency Trials

Feuerle, Thomas; Stanisak, Mirko; Saito, Susumu; Yoshihara, Takayuki; Lipp, Andreas

doi:10.1007/978-981-13-7086-1_11

Cited by 4 publications

(3 citation statements)

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“…However, the VDB datalink is a bottleneck for this extension. It does not provide sufficient throughput for correction and integrity data for multiple constellations and frequencies [5,6]. Large and complex airports aggravate this issue: In case a single VDB transmitter cannot provide coverage of the complete airport, two transmitters using alternate time slots on the same VDB channel need to be installed, halving datalink capacity.…”

Section: Introductionmentioning

confidence: 99%

Flight Trial Demonstration of Secure GBAS via the L-band Digital Aeronautical Communications System (LDACS)

Mäurer

Gräupl

Bellido-Manganell

et al. 2021

IEEE Aerosp. Electron. Syst. Mag.

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The Ground Based Augmentation System (GBAS) is the cornerstone for enabling automated landings without the Instrument Landing System (ILS). Currently GBAS is evolving to GAST-D for CAT III landings. This extends GBAS via the use of multiple frequencies (L1/L2 and L5) and the use of multiple global navigation satellite system constellations. GBAS requires correction data to be broadcast to aircraft. This is currently done with the VHF Data Broadcast (VDB) datalink. However, VDB has several known shortcomings: (1) low throughput, (2) small area of operation and (3) no cyber-security measures. In this paper we propose the use of the L-band Digital Aeronautical Communications System (LDACS) for broadcasting GBAS correction data to address these shortcomings. In flight experiments conducted in 2019, we set up an experimental GBAS installation using LDACS. Broadcast data was secured using the TESLA broadcast authentication protocol. Our results indicate that cryptographically secured GBAS data via LDACS can provide GAST-C and GAST-D services with high availability if cryptographic parameters are chosen appropriately.

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Section: Introductionmentioning

confidence: 99%

Flight Trial Demonstration of Secure GBAS via the L-band Digital Aeronautical Communications System (LDACS)

Mäurer

Gräupl

Bellido-Manganell

et al. 2021

IEEE Aerosp. Electron. Syst. Mag.

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“…[12] The VDB datalink has been identified as potentially limiting the evolution of GBAS: Lee et al have critized that VDB can only transmit corrections for the L1 frequency of GPS satellites, which may be problematic in terms of availability in equatorial zones [11]. Feuerle et al and Stanisak et al have noted that VDB does not provide sufficient throughput for correction and integrity data for multiple constellations and frequencies [8], [16]. Finally, Felux et al and Garcia et al have called attention to the issue that VDB does not provide cybersecurity measures on par with modern wireless systems [6], [9].…”

Section: Introductionmentioning

confidence: 99%

Performance-Optimizing Secure GBAS Over LDACS

Gräupl

Mäurer

2021

2021 Integrated Communications Navigation and Surveillance Conference (ICNS)

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VHF Data Broadcast (VDB) currently used by GBAS has been identified as a potential source of cyber-security concerns. The use of an alternative datalink providing the bandwidth for more capable security protocols has therefore been proposed and demonstrated on the basis of the L-band Digital Aeronautical Communication System (LDACS). However, the first demonstration of secure GBAS over LDACS suffered from some performance degradation. This paper provides an improved method for secure GBAS over LDACS on the basis of a rigid performance analysis. Optimized parameters are derived and evaluated. The results point the way for further performance enhancements for even more challenging GBAS scenarios.

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“…1: Basic functionality of GBAS link is specific to GBAS: The VHF Data Broadcast (VDB) [20]. The VDB data link has been identified as potentially limiting the evolution of GBAS in several ways [8], [9], [19], [31]. This lead Felux et al to propose the use of an alternative data link for GBAS [7]: The L-band Digital Aeronautical Communication System (LDACS), which is a general purpose broadband data link for aeronautical communication related to safety and regularity of flight [27].…”

Section: Introductionmentioning

confidence: 99%