Abstract: A system for providing air traffic control within a geographic sector to which a communication frequency in the VHF or UHF range is assigned comprises at least one satellite (configured for a communication with an aircraft in the geographic sector using an analog modulated RFF signal at the communication frequency. The system is configured in such a way that at each time, only one satellite is actively transmitting on the communication frequency assigned to the geographic sector.

Abstract: The present invention relates to a communication system is provided, wherein the communication system comprising: a first communication unit, comprising a first communication processor for providing communication via a first channel, at least one second communication unit separate to the first communication unit, comprising a second communication processor for providing communication via a second channel, a coupling unit for coupling the first communication unit with the at least one second communication unit, wherein the first communication unit further comprises: a communication control unit coupled to the second communication unit via the coupling unit, wherein the communication control unit is configured to enable the mutual utilization of electronic resources between the first and second communication unit, and an encryption unit for providing encrypted communication via as well the first communication channel and the second communication channel.

Abstract: A system for providing air traffic control within a geographic sector to which a communication frequency in the VHF or UHF range is assigned comprises at least one satellite (configured for a communication with an aircraft in the geographic sector using an analog modulated RFF signal at the communication frequency. The system is configured in such a way that at each time, only one satellite is actively transmitting on the communication frequency assigned to the geographic sector.

Abstract: The present invention relates to a communication system is provided, wherein the communication system comprising: a first communication unit, comprising a first communication processor for providing communication via a first channel, at least one second communication unit separate to the first communication unit, comprising a second communication processor for providing communication via a second channel, a coupling unit for coupling the first communication unit with the at least one second communication unit, wherein the first communication unit further comprises: a communication control unit coupled to the second communication unit via the coupling unit, wherein the communication control unit is configured to enable the mutual utilization of electronic resources between the first and second communication unit, and an encryption unit for providing encrypted communication via as well the first communication channel and the second communication channel The present invention further relates to a communication m

Abstract: In a frequency-modulated frequency generator comprising an oscillator connected in a phase control loop, the reference frequency is generated in a digital frequency synthesizer which is adapted to be frequency-modulated by digital data signals; under control of the data signal, numerical values are alternately read out from a register to result in corresponding different frequency deviations; the register stores further predetermined additional numerical values which result in frequencies adjacent to said frequency deviations; the register is controlled by the data signal so that for every edge of the data signal predetermined additional numerical values are initially read out in such an order that the frequency values produced thereby will compensate for any overshooting which occurs upon switching between the drift frequencies.