Abstract: A method for resampling time series data includes determining a first time series of data points; determining a variation of the data points within a selected sequence, wherein the variation is determined by determining linearly interpolated data points for the data points of the selected sequence and by determining a maximum absolute difference. If a determined variation is greater than a predetermined error value, subsequences are selected by repeatedly dividing the first time series into adjacent subsequences until the first time series comprises a set of subsequences, wherein a determined variation for each of the subsequences is smaller than the predetermined error value. A resampled time series is created by adding the data points of the first time series that correspond to a first or last data point of the selected subsequences to the resampled time series, wherein every data point is added only once to the resampled time series.

Abstract: A mechanical support ring structure for supporting a deployable space reflector antenna. The mechanical support ring structure is convertible from a folded state into a deployed state and includes a ring-shaped pantograph having a plurality of circumferentially arranged pantograph sections which are deployable for converting the mechanical support ring structure from the folded state into the deployed state, and a plurality of circumferentially arranged support rods, each pantograph section being arranged between a respective pair of support rods, wherein each pantograph section includes one or more pairs of pantograph rods which intersect crosswise with each other at a respective crossing position.

Abstract: Embodiments are disclosed of an orthomode transducer (OMT) device for splitting a linear orthogonally polarized electromagnetic signal into a plurality of linearly polarized frequency components and vice versa. The device comprises a rectangular or circular guide section having a constant cross-section perpendicular to a lengthwise direction of said guide section and first and second lengthwise opposed open ends, a septum that is successively increased in height; extending from an end of the a waveguide portion towards a second lengthwise open end of the guide section, wherein that the plane of said septum is provided at an angle of 45 degrees relative to the polarization axes of the orthogonal linear polarization modes and said septum induces a differential phase shift of substantially 180 degrees or a multiple thereof between components of the linear polarization modes that are perpendicular to said septum and components that are parallel to said septum.

Abstract: A method for generating a digital signal of tunable frequency may include generating a periodic first analog signal, determining a sign of a first difference between a value of the first analog signal and a first control value to determine sign flips, wherein the first control value is a variable value, and generating the digital signal of tunable frequency on the basis of the determined sign of the first difference, wherein the digital signal of tunable frequency is generated such that a subset of switches of the signal level are coincident with a respective sign flip of the determined sign of the first difference.

Abstract: A mechanical support ring structure for supporting a deployable space reflector antenna. The mechanical support ring structure is convertible from a folded state into a deployed state and includes a ring-shaped pantograph having a plurality of circumferentially arranged pantograph sections which are deployable for converting the mechanical support ring structure from the folded state into the deployed state, and a plurality of circumferentially arranged support rods, each pantograph section being arranged between a respective pair of support rods, wherein each pantograph section includes one or more pairs of pantograph rods which intersect crosswise with each other at a respective crossing position.

Abstract: One embodiment of the invention provides a receiver for use in a navigation system comprising multiple transmitters. Each transmitter transmits a positioning signal comprising a pseudo-random noise (PRN) sequence corresponding to the respective transmitter. The receiver comprises a code module for supplying multiple PRN sequences corresponding to the respective multiple transmitters; and a correlator for correlating the PRN sequences supplied by the code module with an incoming signal. The multiple PRN sequences are based on a single Sidelnikov/Lempel/Cohn/Eastman (SLCE) generative sequence uSLCE, and each of said multiple PRN sequences, denoted ui satisfies the equation: ui=uSLCE?TiuSLCE, where ? indicates element by element binary XOR addition, and Ti indicates a cyclic shift of i chips.

Abstract: The present invention relates to a method and an apparatus for determining an integrity indicating parameter (e.g. an integrity risk IR or a protection level PL) indicating the integrity of positioning information determined from positioning information signals disseminated from a plurality of space vehicles SAT1, SAT2, SAT3 of a global positioning system. An input parameter (e.g. an alert limit AL or an integrity risk IR) is provided, a plurality of integrity information parameters (?SISA, ?SISMA or equivalent, ?X, kX) are received, and the integrity indicating parameter (IR; PL) is determined on the basis of the input parameter (AL; IR) and on the basis of a first relation between the integrity indicating parameter (IR; PL) and the input parameter (AL; IR) and the plurality of integrity information parameters (?SISA, ?SISMA or equivalent, ?X, kX).

Abstract: A mask packet is provided with bits in a ONE state for all predictable bit positions and with a ZERO state for all unpredictable ones. All predictable bit positions of the new data packet are brought into a ZERO state if an actual bit state matches the predicted bit state and into a ONE state if the actual bit state does not. A processed packet is generated by applying an AND operation between the new data packet and the mask packet to change all unpredictable bits to a ZERO state. A series of counters is provided by calculating the number of bits in the processed packet between the first bit and the first bit with a state ONE; and between the following bits with a state ONE and between the last bit with a state ONE and the last bit in the processed packet. The counters are stored or transmitted.

Abstract: Deployable support structures include a six-bar linkage structure as a lateral facet of a truncated pyramid. The six-bar linkage structure comprises six articulated struts, each coupled to two others by a revolute joint to form a closed loop. The six-bar linkage structure is convertible from a deployed state into a folded state and vice versa. In the deployed state of one embodiment, the six-bar linkage structure forms a trapezoid with two opposing first and second parallel sides formed by two struts arranged in series and coupled by a revolute joint at the center of the parallel sides. In the folded state, the two struts of each parallel side are pivoted around the joint so that opposing end portions of the struts are located side by side. Scalable and modular deployable structures can be made for space applications as well as civil constructions such as domes, roofs, housing, tents, and bridges.

Abstract: A method and apparatus monitor an operational state of a telemetry data system, wherein the operational state is a nominal or a novel operation state. The telemetry data includes time series data of at least one parameter indicating the operational state. The method obtains sample interval data indicating a parameter time series data of the at least one parameter relating to a time interval duration; determines one or more characteristic quantities of the sample interval data, the characteristic quantities determined forms a sample set; obtains pre-stored sets of characteristic quantities at least one parameter and time intervals duration during nominal operation state; determines a probability sample set of characteristic quantities being outlier with respect to pre-stored sets of characteristic quantities; and if the probability exceeds a threshold, provides a message with the sample interval data and at least one system parameter or notifies no novel behaviors found.

Abstract: A mask packet is provided with bits in a ONE state for all predictable bit positions and with a ZERO state for all unpredictable ones. All predictable bit positions of the new data packet are brought into a ZERO state if an actual bit state matches the predicted bit state and into a ONE state if the actual bit state does not. A processed packet is generated by applying an AND operation between the new data packet and the mask packet to change all unpredictable bits to a ZERO state. A series of counters is provided by calculating the number of bits in the processed packet between the first bit and the first bit with a state ONE; and between the following bits with a state ONE and between the last bit with a state ONE and the last bit in the processed packet. The counters are stored or transmitted.

Abstract: The invention relates to a method for assembling two or more mirror plate stacks into a rigid unit in turn comprising a plurality of mirror plates and a base plate onto which the plurality of mirror plates are stacked. To improve assembly accuracy of the mirror plates, a base plate is provided with a first mirror plate mounted thereto, a handling tool is provided with a second mirror plate and a spacer is provided to a first surface of the second mirror plate and positioned to align the second mirror plate with the first mirror plate. This alignment is based on a measured position and shape of the first mirror plate to compensate for a deviation from a pre-defined position and shape. The plates are then attached to each other with the spacer; the handling tool is removed and the position and shape of the second mirror plate is measured.

Abstract: A method for determining a position of an object having a Global Navigation Satellite System (GNSS) receiver comprises receiving signals that are transmitted by GNSS transmitters positioned on board satellites positioned in view of the object; updating service data in the object, the service data including satellite clock data, satellite orbit data, satellite delay code bias data relating to delay code biases of the GNSS transmitters, and ionospheric model data indicating a state of an ionosphere; determining, based on the ionospheric model data, ionospheric delay data indicating corrections relating to delays of the signals, the delays of the signals resulting from passage of the signals through the ionosphere, and reception of the signals by the GNSS receiver; and determining a position of the object based on the signals, the satellite clock data, the satellite orbit data, the satellite delay code bias data, and the determined ionospheric delay data.

Abstract: The present invention relates to optical devices for imaging and spectroscopic applications where optical field curvature is a predominant characteristic. In particular, the invention relates to imaging optics and an optical device for mapping a curved image field. The optical device for mapping a curved image field comprises a focal plane array 20 having a plurality of light processing elements 21 and a focal plane adapter 110 mounted in front of the focal plane array 20 configured to transmit the curved image field to the light processing elements 21 of the focal plane array 20.

Abstract: The present invention relates to a method for resampling time series data and to a telemetric device configured to resample measured time series data. A method for resampling time series data comprises the following steps: determining a first time series 10 comprising a sequence of data points Pi; determining a variation V of the data points Pi within a selected sequence of data points, wherein the variation V is determined by determining linearly interpolated data points Qi for the data points Pi of the selected sequence and by determining a maximum absolute difference V between the data point value Pi and the corresponding interpolated data point value Qi for the data points of the selected sequence.

Abstract: The present invention relates to an orthomode transducer (OMT) device (1) for splitting a linear orthogonally polarized electromagnetic signal into a plurality of linearly polarized frequency components and vice versa. The OMT device comprises a rectangular or circular guide section having a constant cross-section perpendicular to a lengthwise direction of said guide section and first and second lengthwise opposed open ends, a septum (3) that is successively increased in height; extending from an end of the a wave guide portion (4) towards a second lengthwise open end of the guide section, wherein that the plane of said septum (3) is provided at an angle of 45 degrees relative to the polarization axes of the orthogonal linear polarization modes and said septum (3) induces a differential phase shift of substantially 180 degrees or a multiple of 180 degrees between components of the linear polarization modes that are perpendicular to said septum (3) and components that are parallel to said septum (3).

Abstract: The present invention relates to a method and an apparatus for determining which one or more time series parameters of a plurality of time series parameters relating to operation of a system are correlated with a first operation state of the system.

Abstract: Embodiments of an Earth observation satellite comprising a satellite main body having an elongated shape extending in the direction of a roll axis R of the satellite from a first base face of the satellite main body to a second base face of the satellite main body, the satellite main body having a plurality of lateral faces extending from the first base face to the second base face; a solar array; and propulsion means for compensating air-drag being arranged on the base face of the satellite main body. A first solar panel of the solar array is mounted on a first lateral face of the satellite main body, a second lateral face of the satellite main body is configured to radiate heat away from the satellite main body, and a third lateral face of the satellite main body has observation means for Earth observations.

Abstract: The invention relates to a method for assembling a mirror plate stack 30 comprising a plurality of mirror plates 10 and a base plate 13 onto which the plurality of mirror plates are stacked. Additionally, the invention relates to a method for assembling two or more mirror plate stacks into a rigid unit.

Abstract: A receiver is provided for use with a satellite navigation system comprising a constellation of multiple satellites. Each satellite transmits a signal incorporating a spreading code. The receiver includes at least one code storage unit that includes combinatorial logic for storing a memory code comprising a fixed pattern of bits including address decoding, wherein the stored memory code corresponds to a spreading code incorporated into a signal transmitted from a satellite. The receiver further includes a correlator for performing a correlation between an incoming signal and the stored spreading code from the one code storage unit.