The L-band digital aeronautical communications system (LDACS) is a key enabler of the new air traffic services and operational concepts necessary for modernization management (ATM). After its initial design, compatibility tests with legacy systems, functional demonstrations in laboratory, currently undergoing standardization process International Civil Aviation Organization (ICAO). However, LDACS has not been demonstrated flight yet. In this article, we present first in-flight demonstration...

The current VHF communications infrastructure for air traffic management is struggling to keep up with growing volume. To address this issue, a new digital aeronautical data link called L-band Digital Aeronautical Communications system (LDACS) has been introduced. be considered implementation the maturity of LDACS advanced. achieve required technology readiness level TRL6, SESAR project PJ33 developed technological validation platform conduct flight trials and verify in realistic setting....

The ground-based augmentation system (GBAS) is the cornerstone for enabling automated landings without instrument landing (ILS). Currently, GBAS evolving to approach service type-D (GAST-D) category III landings. This development toward GAST-D extends via use of multiple frequencies (L1/L2 and L5) global navigation satellite constellations. requires correction data be broadcast aircraft, which currently handled VHF (VDB) datalink. However, VDB has several known shortcomings: 1) low...

The increasing air traffic foreseen for the next decades has triggered an extensive modernization of management. Specifically, new services and operational concepts have been defined shall be supported during all phases flight by a set modern digital data links integrated into single communications network named Future Communications Infrastructure (FCI). air-to-air (A2A) component FCI, L-band Digital Aeronautical System (LDACS) A2A mode, is currently in initial stages its development. Given...

In this paper, an LDACS-based wide area multilateration approach is proposed as a passive cooperative surveillance alternative for civil aviation. Firstly, the underlying concept introduced and detailed proof of analysis carried out. The suitability limitations LDACS airborne transmission are then assessed, in particular terms achievable update interval, aircraft identification capabilities, time delay measurement precision. preliminary simulation results support feasibility functionality.

The L-band digital aeronautical communications system (LDACS) is a cellular air-ground data link for air traffic control. It cornerstone of the future infrastructure. LDACS shall operate in frequency band 960-1164 MHz under constraint secondary spectrum usage. This implies strict spectral, power, and spatial separation toward current legacy systems operating this band. has been proposed to fulfil these restrictions using cell planning without changing allocations systems. However,...

The L-band digital aeronautical communications system (LDACS) is the future air-ground technology currently undergoing International Civil Aviation Organization standardization process. As LDACS intended to operate in frequency band 960-1164 MHz, compatibility tests between and legacy systems operating this are necessary ensure that no harmfully interfered. One of these joint tactical information distribution (JTIDS), a employed by data link Link 16. In paper, we present results an impact...

The operation of unmanned aircraft is unthinkable without reliable wireless communication links: Despite a comparatively high expected level autonomy aircraft, monitoring and remote controlling are required to some degree. As the design every link requires good knowledge on characteristics channel, we have performed measurement campaign collect channel sounding data for air-ground at C-band. While focused description analysis dominant signal component in previous publications, now...

The 960-1215 MHz frequency range in the L-band is allocated worldwide on a primary basis to aeronautical radio navigation service (ARNS). At World Radio Conference 2007, 960-1164 within was additionally mobile (route) (AM(R)S) co-primary allow future communication systems share large parts of with existing services. digital communications system (LDACS) will operate its air-ground (A/G) and air-to-air (A2A) data links under AM(R)S allocation ensuring spectrum sharing without mutual harmful...

In the context of SESAR and NextGen frameworks, a series air traffic services operational concepts are envisaged for modernization management. These, however, assume availability an air-to-air (A/A) data link capable supporting addressed, multicast, broadcast as well voice communications under stringent performance requirements. Even though several A/A links available today, none them is expected to be able support all demanding this paper, we take initial steps design advanced link. This...

Currently, aeronautical communications is undergoing a modernization process from analog to digital technology. The L-band Digital Aeronautical Communications System (LDACS) the upcoming data link for air-ground and being standardized within ICAO as well EUROCAE at moment. A wireless communication system can be interrupted by intended or unintended jamming signals. Therefore, robustness of systems crucial. In this paper, we investigate use beamforming in LDACS improve its performance...

Mobile-to-mobile (M2M) propagation channels have gained significant attention over the last years with development of advanced communication systems for all kind mobile stations such as aircraft, drones, cars, and ships. However, most available channel models do not account environment where are located, but defined either average or worst-case conditions, being able to predict behaviour in specific scenarios. This is especially true scattering components channel, which generally ignored a...

This paper presents a statistical analysis of the main components aircraft-to-aircraft channel based on wideband measurements conducted between two aircraft in VHF/UHF band at 250 MHz. We consider multiple flight segments where flew diverse altitudes and used different antennas for transmission reception, alternating top bottom antenna. In each scenario interest, we analyse power small-scale fading envelope direct line-of-sight component specular reflection off lake. For both components,...

Today's voice-based air-ground communication system for aircraft guidance is suffering from increasing saturation of the VHF band in high density areas. Therefore European Union strives a transition analog voice to more spectrum efficient digital communication. This shall be realized, among others, through development and implementation L-band Digital Aeronautical Communications System (LDACS). In order verify suitability LDACS both communications navigation, flight trial campaign will...

Operating remotely piloted aircraft is not imaginable without a continuous data exchange between the air vehicle and remote pilot. This requires reliable links. One approach for such link discussed in community terrestrial system deployed C-band. A good knowledge of physical conditions communication channel, this case air-ground/ground-air indispensable development wireless Therefore we carried out 50 MHz bandwidth channel sounding campaign with transmitter an airborne receiver. In paper...

In this paper, we present a complete analytic probability based description of mobile-to-mobile uncorrelated scatter channels. The correlation introduced by Bello and Matz is thus complemented the presented probabilistic leading to common theoretical Furthermore, introduce novel twodimensional hybrid characteristic density functions, which remain in one variables function other variable. Such allows us derive mathematical model, attenuation scattering components inherently included these...

This paper presents a geometric stochastic channel model designed for analyzing maritime communication and navigation services between moving ships using the C-band or sub-6 GHz spectrum, which aligns with focus of emerging 5G networks on land. The is validated through measurements conducted both sea A software tool has been developed to integrate analyze these measurements, included this publication. main challenge in developing lies dynamic nature surface, leading constantly changing...

Even under conservative assumptions for a worse-case interference on JTIDS, its degradation remains far below 1 dB in any case. For realistic conditions, the of default JTIDS transmission is expected to be lower than 0.15 dB. Our results represent an estimation by presence LDACS.

European air traffic system will experience capacity barriers in the future Increasing New players like UAVs Current aeronautical communication technologies already approach their limits EU project SESAR identified need for new systems to support sustainable growth of transportation Complement under development Satellite based AeroMACS airport communications LDACS terrestrial communications.

In this paper we present differential geometric concepts for future mobile-to-mobile channel models. Those enable the reader to generalize description and apply it different scenarios. The allows a non-stationary model, which thus incorporates high mobility scenarios, are very important in systems. Hereby, mathematical similar theory of general relativity. Differential forms coordinate system transforms part tensor channel.Our model channels is based on two concepts: prolate spheroidal...