Abstract: A system for localizing an object in an indoor environment. The system uses a plurality of wireless access points and at least one cooperative mobile network device. The cooperative mobile network device is connected to at least one of the wireless access points. The wireless access points and the cooperative mobile network device sense first and second signal propagation data of wireless signals transmitted via the wireless communication network. The cooperative mobile network device evaluates the second signal propagation data and determines its own position based on the data and the positions of the wireless access points. A position of an object is obtained based on the evaluated first and second signal propagation data, the positions of the wireless access points and the determined position of the cooperative mobile network device.

Abstract: A system for object localization in an indoor environment, such as a passenger cabin of a vehicle or an aircraft, includes a wireless communication infrastructure to facilitate wireless communication within the indoor environment via a wireless communication network and including at least one wireless access point to provide user devices access to the wireless communication network within the indoor environment. The wireless access point is adapted to acquire signal propagation data of wireless signals transmitted over the wireless communication network along multiple propagation paths. A computing element is configured to analyze the signal propagation data and extract localization data from the signal propagation data, the localization data specifying the position of objects located within the indoor environment.

Abstract: A fill level measuring device for measuring the fill level of a liquid in a tank of a vehicle includes a multiband slotted waveguide antenna to be attached in the upper region of the tank, the antenna having a waveguide and multiple slots spaced apart, which are dimensioned differently, so that they have different resonance frequencies, to respectively emit radar waves having different frequencies. At least one radar transmitter can be coupled to the waveguide to feed the multiband slotted waveguide antenna with radar waves having the different resonance frequencies, and at least one radar receiver is provided for receiving reflected radar waves of different frequencies via the multiband slotted waveguide antenna. An evaluation unit is provided for detecting the fill level and the spatial distribution of the liquid in the tank based on the reflected radar waves.

Abstract: An energy sending method for sending an energy beam generated by a sender to an airborne receiver, by targeting an energy receiving element of the receiver; and sending the energy beam to the energy receiving element. Also a device for sending an energy beam to the airborne receiver, an aircraft comprising an energy sending device. Also, a method for receiving with an airborne receiver an energy beam generated by a sender, by receiving the energy beam with an energy receiving element of the receiver; and converting the energy beam for powering at least one energy sink of the receiver. Also, a device for receiving energy and powering an airborne receiver with an energy beam, and an air vehicle having the energy receiving device.

Abstract: A communication system for secure communication between a flying aircraft, wherein a communication infrastructure is provided in both aircraft as well as a computer program establishing a communication link between the aircraft. The first aircraft may be provided with a first communication node and a first processing unit and the second aircraft may be provided with a second communication node and a second processing unit. The communication system comprises a computer program product which is configured, when executed on the processing units of the aircraft, to cause the communication system to establish a communication link between the flying aircraft when a distance between the flying aircraft is in a short range.

Abstract: Methods, systems, and devices for free-space optical communications. An aircraft includes a flat optical communication terminal on an external surface of the aircraft, the flat optical communication terminal being configured to communicate with a ground station via a free-space optical communication link.

Abstract: A system for localizing an object in an indoor environment. The system uses a plurality of wireless access points and at least one cooperative mobile network device. The cooperative mobile network device is connected to at least one of the wireless access points. The wireless access points and the cooperative mobile network device sense first and second signal propagation data of wireless signals transmitted via the wireless communication network. The cooperative mobile network device evaluates the second signal propagation data and determines its own position based on the data and the positions of the wireless access points. A position of an object is obtained based on the evaluated first and second signal propagation data, the positions of the wireless access points and the determined position of the cooperative mobile network device.

Abstract: A fill level measuring device for measuring the fill level of a liquid in a tank of a vehicle includes a multiband slotted waveguide antenna to be attached in the upper region of the tank, the antenna having a waveguide and multiple slots spaced apart, which are dimensioned differently, so that they have different resonance frequencies, to respectively emit radar waves having different frequencies. At least one radar transmitter can be coupled to the waveguide to feed the multiband slotted waveguide antenna with radar waves having the different resonance frequencies, and at least one radar receiver is provided for receiving reflected radar waves of different frequencies via the multiband slotted waveguide antenna. An evaluation unit is provided for detecting the fill level and the spatial distribution of the liquid in the tank based on the reflected radar waves.

Abstract: Methods, systems, and devices for free-space optical communications. An aircraft includes a flat optical communication terminal on an external surface of the aircraft, the flat optical communication terminal being configured to communicate with a ground station via a free-space optical communication link.

Abstract: A system for object localization in an indoor environment, such as a passenger cabin of a vehicle or an aircraft, includes a wireless communication infrastructure to facilitate wireless communication within the indoor environment via a wireless communication network and including at least one wireless access point to provide user devices access to the wireless communication network within the indoor environment. The wireless access point is adapted to acquire signal propagation data of wireless signals transmitted over the wireless communication network along multiple propagation paths. A computing element is configured to analyze the signal propagation data and extract localization data from the signal propagation data, the localization data specifying the position of objects located within the indoor environment.