Abstract: This disclosure provides systems, methods and apparatus for implementing an arrangement of electromechanical switches. In one aspect, the arrangement includes rings of electromechanical switches configured to provide access to communication processing channels and redundancy access rows of electromechanical switches configured to provide access to redundant communication processing channels.

Abstract: Disclosed herein is a system including analog receive paths and analog transmit paths and signal processing equipment onboard a satellite, and methods for use therewith. For each of a plurality of the analog receive paths, a calibration signal is injected therein below a noise floor thereof, while the path is actively used to receive and condition an RF signal, and the calibration signal is extracted from the analog receive path after the signal has traveled through at least a portion of the path. The extracted calibration signal is compared to the injected calibration signal to determine gain and phase deviations caused by the path. Gain and phase characteristics of the analog receive paths are adjusted to compensate for different gain and phase deviations being caused by different paths. Similar techniques are used to compensate for different gain and phase deviations being caused by different analog transmit paths.

Abstract: A contact detecting system for an air refueling tanker equipped with an air refueling boom, the system comprising a boom refueling nozzle comprising a valve to allow the exit of fuel, a latch to engage the refueling nozzle, a first contact detecting mechanism configured to transmit a signal when the refueling nozzle is in a contact position, a second contact detecting mechanism configured to detect the position of the latch and to transmit a signal when the latch is latched, and a third contact detecting mechanism configured to detect the position of the valve and to transmit a signal when the valve is open. The system further comprises a computing device configured to receive the signals from the first, second and third contact detecting mechanisms and to provide an output signal of the contact status of the refueling nozzle.

Abstract: A hybrid metal-composite drive shaft unit, which comprises at least one metal drive shaft connector that is at least partly embedded into a composite drive shaft, the composite drive shaft comprising a thermoplastic polymer and being connected to the at least one metal drive shaft connector by means of a welded connection that defines a first load path for transmission of loads between the at least one metal drive shaft connector and the composite drive shaft, the at least one metal drive shaft connector and the composite drive shaft comprising, in the region of the welded connection, at least partly a polygonal cross-sectional shape for forming a form-fit connection that defines a second load path for transmission of loads between the composite drive shaft and the at least one metal drive shaft connector.

Abstract: A received Direct Sequence Spread Spectrum DSSS signal is processed by performing DSSS acquisition to obtain estimates of a frequency offset and a spreading code phase, sequentially obtaining, for each one of a plurality of segments of a received DSSS signal, a correlation function between the DSSS signal segment and a replica of a spreading code by using a Time and Frequency Transform based correlation method, the estimated frequency and the spreading code phase, and performing DSSS carrier tracking by tracking the phase of a correlation peak in the obtained correlation functions, and applying phase corrections to the obtained correlation functions to provide fine Doppler compensation. The time and frequency transform based correlation method involves, for each segment of the received DSSS signal, obtaining a plurality of samples and transforming the samples from the time domain to the frequency domain.

Abstract: A satellite system that includes a gateway, a satellite, and a user terminal. The gateway determines a modulation scheme based on a function of uplink and downlink signal quality and a defined relationship between the downlink modulation to the uplink modulation. The satellite includes an input demodulator configured to apply an input modulation and coding (modcod) scheme; an output modulator configured to apply an output modcod scheme; and an output modcod scheme selector configured to select an output modcod scheme for the output modulator based on the input modcod scheme according a predetermined relationship between input modcod schemes and output modcod schemes. The user terminal providing the gateway a measure of downlink signal quality.

Abstract: A high-lift system for an aircraft includes a high-lift flap which is arranged on the wing of the aircraft and is mounted on a carriage coupled to the wing, the carriage being displaceably mounted on a track by means of a high-lift bearing. The high-lift bearing includes a plain bearing.

Abstract: Provided is a hybrid network end system device for a network system with an end system unit and a switch. The switch here exhibits at least one first port of the switch and a second port of the switch for connection with the network system.

Abstract: The present invention provides a Voigt line shape fitting method, including step 1: Calculate a Gauss line shape function and a Lorentz line shape function, and calculate a Voigt line shape function. Step 2: For determined line shape parameters to be fitted, calculate partial derivatives of the Voigt line shape function with respect to the parameters, convert a partial derivative of the Voigt line shape function with respect to a parameter into a partial derivative of the Gauss line shape function or the Lorentz line shape function with respect to the parameter. Step 3: Substitute the Voigt line shape function and the partial derivative of the Voigt line shape function with respect to the parameter to be fitted, into a least squares algorithm step, perform least squares fitting calculation, and determine whether to terminate the least squares fitting calculation or return to step 1 to perform next iterative calculation.

Abstract: A high efficiency secondary signal combiner may include a frequency division multiplexer that is configured to receive two or more signals and produce a combined signal. The combined signal may include the two or more signals, and each of the two or more signals may be in different Nyquist zones. The combiner may also include a wideband analog-to-digital converter (ADC) that is configured to frequency shift the combined signal by sub-sampling the two or more signals to produce a sub-sampled signal in a Nyquist zone that is different from the Nyquist zones of the two or more signals.

Abstract: A propellant distributor or anode includes a plenum chamber and a plurality of outlets. The at least one plenum chamber is configured to receive a flow of propellant from an inlet, and the plurality of outlets are configured to distribute the flow of propellant into an inner channel wall and an outer channel wall of a discharge channel.

Abstract: A spacecraft includes a payload subsystem, the payload subsystem including a phased array of feed elements configured to illuminate an antenna reflector, a beam forming network (BFN) disposed proximate to the array of feed elements, and a plurality of power amplifiers disposed between the BFN and the array of feed elements. The BFN includes a plurality of variable amplitude and phase adjusting arrangements disposed between (i) m:1 power combiners that are communicatively coupled with the power amplifiers and (ii) at least one 1:n power splitter, where m is greater than 1, and n is greater than 2.

Abstract: A, method and apparatus for wirelessly transmitting data to a plurality of terminals in each of a plurality of beams through a plurality of transmit feeds includes selecting, for each beam, two or more terminals among the plurality of terminals in the beam as a subgroup of terminals, on the basis of channel state information of the plurality of terminals; determining, for each beam, equivalent channel state information representing the subgroup of terminals in the beam on the basis of the channel state information of the terminals of at least one of the plural subgroups of terminals; and determining a set of weight coefficients that relate the plurality of transmit feeds to a plurality of signals that are intended for transmission in the plurality of beams on the basis of the equivalent channel state information representing the plural subgroups of terminals.

Abstract: A spacecraft with a linear extension boom, an antenna feed, and a rigid antenna reflector is provided. The rigid antenna reflector may be connected with one end of the linear extension boom, and the other end of the linear extension boom may be connected with the spacecraft main body. In a launch configuration of the spacecraft, the linear extension boom may be retracted into a stowed configuration, and in an on-orbit configuration of the spacecraft, the linear extension boom may be extended into a deployed configuration, thereby moving the rigid antenna reflector away from the yaw axis of the spacecraft and positioning the rigid antenna reflector such that the focal point of the rigid antenna reflector may be oriented to align on, and be collocated with, the antenna feed. The rigid antenna reflector may be connected with the linear extension boom by a positioning mechanism that provides for adjustment in the angular orientation of the rigid antenna reflector relative to the linear extension boom.

Abstract: A modularized feed array arrangement includes a plurality of radio frequency (RF) radiating elements, a plurality of waveguides positioned inboard of the plurality of RF radiating elements, each RF radiating element being electrically coupled with an outboard portion of one or more of the waveguides; and a plurality of modules, each module including a plurality of RF switches, a plurality of amplifiers, and a manifold panel that includes a plurality of RF choke joints. An inboard portion of each RF switch is electrically coupled with a respective amplifier. Each RF choke joint includes a proximal portion electrically coupled with an outboard portion of a respective one of the RF switches and a distal portion electrically coupled with an inboard portion of a respective one of the waveguides.

Abstract: The present invention discloses a multi-lightpath and multi-angle measurement apparatus, including an electrically controlled rotary table, electronically controlled translation tables, a laser transmitting/receiving end face, laser couplers, a multipath data acquisition card, a laser controller, a translation controller, an etalon, a laser, detectors, and a computer. The measurement apparatus uses an all-fiber coupling structure, and two ends of the laser transmitting/receiving end face are respectively fixed on two electronically controlled translation tables. Therefore, a maximum area measured by the apparatus is 350 mm×350 mm, and an adjustable minimum translation distance is 1 mm. Bottoms of the translation tables are fixed on the electrically controlled rotary table. Featuring an ingenious design and a compact structure, the whole apparatus is easy to disassemble and easy to operate.

Abstract: The present disclosure relates to a modular solar power generation apparatus comprising a base plate, a light guiding unit, a plurality of connection units and a plurality of solar panels wherein: the light guiding unit is installed on the base plate; all connection units are circlewise mounted on the base plate and encircling the light guiding unit; each the solar panel, which is connected to one of the connection units, and the base plate form an angle of inclination by which each the solar panel features upward broadened widths such that any two neighboring solar panels allow their corresponding edges to be adjacent to each other and a gap in between to be narrowed for development of solar panels easily installed and maintained.

Abstract: A DC switching device has at least one switching unit which is arranged between two terminals. Further, the DC switching device has a control unit for controlling the at least one switching unit. The switching unit has a first and a second semiconductor switching element, which are arranged in parallel with one another, the first switching element being a high-voltage switching element and the second switching element being a low-power-loss switching element. The switching unit is controllable by the control unit in such a way that, when the switching unit is switched off, initially the second switching element is switched to be non-conductive, and subsequently the first switching unit is switched to be non-conductive, and when the switching unit is switched on, initially the first switching element is switched to be conductive and subsequently the second switching element is switched to be conductive.

Abstract: Gas migration rate(s) are determined using gas measurements from gas migration measurement devices. In response to the gas migration rate increasing at greater than a first rate: air ionization measurements are collected from: remote sensing air ionization measurement device(s), meteorological measurements collected from air temperature sensor(s) and relative humidity sensor(s). A latent heat energy release rate is determined using at least two of: the air ionization measurements; the meteorological measurements; and a numerical assimilation model. In response to the latent heat energy release rate increasing at greater than a second rate, transient OLR anomaly are looked for using atmospheric measurements. In response to observing the transient OLR, ionospheric anomal(ies) are looked for using ionosphere measurements collected over a fourth period of time.

Abstract: The embodiment relates to the production of reinforced materials, for example reinforced foam materials or reinforced textiles. A multi-needle machine is provided with a plurality of serially arranged repeating units, which are able to move sliders and pins toward and past each other along a circular path so as to create the semi-finished textile products. In this way, it is possible to reinforce components with curved surfaces.