Abstract: Systems and methods disclose a satellite communication system including a plurality of antenna elements, an interface circuit, and a transceiver circuit. Each antenna element communicates a first polarization signal and a second polarization signal. The interface circuit receives, amplifies, and splits the first polarization signals into a first polarization primary signal and a first polarization secondary signal. The interface circuit also receives, amplifies, and splits the second polarization signals into a second polarization primary signal and a second polarization secondary signal. A first summer circuit generates a first beam signal via a sum of the first and second polarization primary signals. A second summer circuit generates a second beam signal via a sum of the first and second polarization secondary signals.

Abstract: Systems and apparatuses include an electronically scanned array system including a power supply system, a radiating element subarray, a plurality of beamformer chips, and a plurality of control buses. The power supply system a first power converter structured to receive and condition mains power, a second power converter arranged in parallel with the first power converter, and a controller structured to monitor the first power converter and the second power converter and to operate one of a first switch or a second switch to provide conditioned power. The radiating element subarray includes active radiating elements, and between about one percent and about twenty percent reserve radiating elements distributed throughout the active radiating elements.

Abstract: Systems and methods disclose a satellite communication system including a plurality of antenna elements, an interface circuit, and a transceiver circuit. Each antenna element communicates a first polarization signal and a second polarization signal. The interface circuit receives, amplifies, and splits the first polarization signals into a first polarization primary signal and a first polarization secondary signal. The interface circuit also receives, amplifies, and splits the second polarization signals into a second polarization primary signal and a second polarization secondary signal. A first summer circuit generates a first beam signal via a sum of the first and second polarization primary signals. A second summer circuit generates a second beam signal via a sum of the first and second polarization secondary signals.

Abstract: Space asset tracking system includes a space asset tag (SAT) disposed in a tag housing. A space vehicle tracking system (SVTS) disposed within the tag housing includes a power supply, a position sensing receiver system (PSRS), and a ground link radio frequency (GLRF) transmitter under the control of a processing circuit. The processing circuit selectively causes the GLRF transmitter to automatically transmit tracking information based on the position information. The system can also include a ground station for receiving the tracking information.

Abstract: A system and method are disclosed for measurement and reporting of signal quality in an optical data link in terms of Bit Error Rate (BER). The system and method of optical fiber signal quality measurement is highly accurate in early determination of signal degradation, is computationally simple in implementation, and is immune to instability with variable temperature and other environmental factors. Counting a number of error free Cyclic Redundancy Checks (CRC) of a plurality of video signals, the computationally simple method limits the data analysis required to determine a link OK, a link degraded and a link fault status of the optical data link.

Abstract: A system and method are disclosed for measurement and reporting of signal quality in an optical data link in terms of Bit Error Rate (BER). The system and method of optical fiber signal quality measurement is highly accurate in early determination of signal degradation, is computationally simple in implementation, and is immune to instability with variable temperature and other environmental factors. Counting a number of error free Cyclic Redundancy Checks (CRC) of a plurality of video signals, the computationally simple method limits the data analysis required to determine a link OK, a link degraded and a link fault status of the optical data link.

Abstract: A multi-channel mobile satellite communication system for normal operation within spotbeams and during emergency operation, beyond the normal limit of a spotbeam. The system involves terminating non-emergency calls, then increasing the transmission power on the one channel to carry the emergency call, to a level above the normally acceptable transmission power levels, thereby permitting an extended range for emergency calls.

Abstract: A satellite communication system for aircraft having other than top-mounted satellite communication antennas, wherein the system includes an ability to optimize the operation of the system depending on the existence of other than top-mounted antennas and/or the angular distance between a normal line of such antennas and a line drawn from the antenna to a satellite.

Abstract: A method and apparatus for Doppler compensation in a satellite communications system such as Inmarsat's SATCOM network are disclosed. An aircraft terminal provides satellite communications services in one of several user-selectable modes including a circuit-mode services only mode and other modes providing some data packet services. The terminal includes multiple channel units coupled to a processing circuit. The channel units communicate radio signals via data or circuit channels between the aircraft and a satellite. Each channel unit can receive a channel input transmitted at a known frequency, and measure its frequency. Each channel unit can also transmit a channel output at an adjustable frequency. Each channel unit is operated as a circuit channel when circuit-mode services only is selected. Doppler shift is measured using the difference between the measured and known transmitted frequencies of at least one channel input.