Aircraft to ground unidirectional laser-communications terminal for high-resolution sensors

Horwath, Joachim; Fuchs, Christian

doi:10.1117/12.808869

Cited by 30 publications

(40 citation statements)

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“…For classical communication from the aircraft to the ground, this prove to be sufficient and the demonstration of Ethernet speeds over a distance of 120 km was accomplished in this configuration [34].…”

Section: Pointing and Trackingmentioning

confidence: 98%

“…3.1) mounted in a Dornier 228 turboprop short take-off and landing type aircraft and the optical ground station (OGS, fig. 3.2) of the DLR's Institute of Communications and Navigation constitute an ideal classical host system [34,77]. Initially built for high speed data communications in large area survey scenarios, it is able to provide Fast Ethernet data rates over a stable optical channel for distances of up to 120 km.…”

Section: Chapter 3 Experiments Setupmentioning

confidence: 99%

“…Clearly, for satellite based qkd this can only be partly representative. In classical free-space communications, however, the situation is different: High bandwidth data links between an aircraft and a ground station have been demonstrated [34,35] as well as links to and from satellites in low earth orbit (LEO) [36][37][38]. Additionally inter satellite links, both LEO-LEO and inter orbit to satellites in a geosynchronous orbit (GEO), are already developed [39] to provide high speed data backbones.…”

Section: Introductionmentioning

confidence: 99%

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Air to ground quantum key distribution

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Section: Pointing and Trackingmentioning

confidence: 98%

Section: Chapter 3 Experiments Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Air to ground quantum key distribution

et al. 2012

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“…This system allows automatic traffic data extraction from image sequences in real time on board the aircraft. Data are immediately sent to the ground via air-ground microwave radio relay or laser link [11]. The system is also able to send current orthorectified and georeferenced images to the ground that can be used to produce situation maps, which are required by relief forces [12].…”

Section: Motivationmentioning

confidence: 99%

“…In another configuration, the radio downlink system is replaced by an optical laser transmission, called FELT (free-space experimental laser terminal; [11]). It consists of an airborne optical terminal that aligns the laser towards the ground station.…”

Section: System Overviewmentioning

confidence: 99%

An Operational System for Estimating Road Traffic Information from Aerial Images

et al. 2014

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Given that ground stationary infrastructures for traffic monitoring are barely able to handle everyday traffic volumes, there is a risk that they could fail altogether in situations arising from mass events or disasters. In this work, we present an alternative approach for traffic monitoring during disaster and mass events, which is based on an airborne optical sensor system. With this system, optical image sequences are automatically examined on board an aircraft to estimate road traffic information, such as vehicle positions, velocities and driving directions. The traffic information, estimated in real time on board, is immediately downlinked to a ground station. The airborne sensor system consists of a three-head camera system, a real-time-capable GPS/INS unit, five industrial PCs and a downlink unit. The processing chain for automatic extraction of traffic information contains modules for the synchronization of image and navigation data streams, orthorectification and vehicle detection and tracking modules. The vehicle detector is based on a combination of AdaBoost and support vector machine classifiers. Vehicle tracking relies on shape-based matching operators. The processing chain is evaluated on a large number of image sequences recorded during several campaigns, and the data quality is compared to that obtained from induction loops. In summary, we can conclude that the achieved overall quality of the traffic data extracted by the airborne system is in the range of 68% and 81%. Thus, it is comparable to data obtained from stationary ground sensor networks.

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Space Optical Links for Communication Networks

Carrasco‐Casado

Calvo

2020

Springer Handbooks

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Future spacecraft will require a paradigm shift in the way the information is transmitted due to the continuous increase in the amount of data requiring space links. Current radiofrequency-based communication systems impose a bottleneck in the volume of data that can be transmitted back to Earth due to technological as well as regulatory reasons. Free-space optical communication has finally emerged as a key technology for solving the increasing bandwidth limitations for space communication while reducing the size, weight and power of satellite communication systems, and taking advantage of a license-free spectrum. In the last few years, many missions have demonstrated in orbit the fundamental principles of this technology proving to be ready for operational deployment, and we are now witnessing the emergence of an increasing number of projects oriented to exploit space laser communication (lasercom) in scientific and commercial applications. This chapter describes the basic principles and current trends of this new technology.

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Aircraft to ground unidirectional laser-communications terminal for high-resolution sensors

Cited by 30 publications

References 2 publications

Air to ground quantum key distribution

Air to ground quantum key distribution

An Operational System for Estimating Road Traffic Information from Aerial Images

Space Optical Links for Communication Networks

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