115 results about "Space segment" patented technology

A space segment for a radioterminal communications system includes a satellite having service link antennas of different sizes that are configured to communicate with at least one radioterminal. The service link antennas of different size may serve different sized geographic areas, which may at least partially overlap. Analogous radioterminal communications methods also are provided.

The invention discloses an optical network self-adapting route system for a low/middle orbit double-layer satellite. The system is connected with a satellite-ground access segment by a space segment route, a middle orbit satellite managing layer consists of at least four manager satellites and a manager satellite, the manager satellites and the manager satellite manage a low orbit satellite route layer directly, and the low orbit satellite route layer consists of one main proxy satellite, four secondary proxy satellites and at least 8 ordinary satellites which are connected. The calculating method comprises topological parameters; determination of the life span report of the access to the middle orbit satellite by the low orbit satellite; main proxy node and link; link time delay among satellites; time delay report of the low orbit satellite; time delay report of the middle orbit satellite; wavelength usage rate business load; and the calculation of route cost function. The optical network of the double-layer satellite is divided into an access network with highly dynamic change and a space segment core network of periodic change, the access network takes charge of network convergence between the space segment and the ground network, and the space segment uses a laser link among satellites to relay until reaching a service target satellite.

A belt and tread drum having an annular shell comprising a plurality of circumferentially spaced segments, each of which is mounted on a carrier which disposed in circumscribing relationship to a generally cylindrical actuator rotatably connected with a reciprocating piston disposed within a cavity defined between the actuator and a hub fixed to a central core of the drum. Translational movement of the piston between extended and retracted positions in a direction parallel to the rotational axis of the drum is converted into selected rotational movement of the actuator relative to the hub. A plurality of sets of links interposed between the segments and the actuator and hub have their first ends commonly pivotally pinned to a segment. The second end of one link of each set of links is pivotally pinned to the actuator and the second end of the other link of each set of links is pivotally pinned to the hub. Rotation of the actuator relative to the hub controls the arcuate separation of these second ends such that bringing these second ends toward contiguity moves the segments radially outwardly, and conversely, moving these second ends arcuately apart serves to move the segments radially inwardly of the drum. A hand wheel establishes maximum and minimum rotational movement of the actuator and provides a visual indication of the radial positions of the several segments, i.e. the diameter of the drum.

The present invention relates to a communication system and method that allows a transmitter segment (ground end of uplink segment) to dynamically combine power from plurality of propagation channels (transponders) in order to improve power levels of signals being transmitted, without affecting the receiver segment (user end of downlink segment) and the propagation segment (space segment), and without modifying the configuration of the propagation apparatus (satellite). Specifically, the transmitter segment generates mixtures of input signals by using Wavefront-Multiplexing and transmits the wavefront-multiplexed (WFM) signals through propagation channels to a receiver segment that coherently separates the mixtures of received WFM signals by using adaptive equalization and Wavefront-De-Multiplexing. The WFM signal mixtures allow an operator, or automated system, at the transmitter segment to dynamically allocate equivalent channel (transponder) powers according to continuously changing market demands by dynamically including change of relative input powers into ratios of the WFM signal mixtures being transmitted.

A method and apparatus for providing remote access redirect in a host channel adapter of a system area network are provided. The apparatus and method provide a mechanism by which a host channel adapter, in response to receiving a marker message, places selected channel(s) of the host channel adapter in a remote access redirect (RAR) mode of operation. During the RAR mode of operation, memory access messages received by the host channel adapter that are destined for portions of an application memory space marked as being protected are converted to RAR receive messages and redirected to a queue pair associated with an operating system rather than the queue pair for the application. The operating system is responsible for serializing access to application memory pages outside of the host channel adapter. The mechanisms of the present invention may be used to perform a checkpoint data integrity operation.

The invention provides a global real-time Internet of things (IOT) constellation system. The system includes a space segment including a plurality of low-orbit satellites that are interconnected through inter-satellite links, a ground segment which is used for completing an operation control function and a data distribution and recovery processing function. The ground segment includes a pluralityof constellation gateway stations. The system also comprises a user segment which is used for collecting sensing data and comprises a plurality of user terminals. The constellation gateway stations ofthe ground segment and the user terminals of the user segment communicate with the low-orbit satellites of the space segment through respective links. The system has the advantages that the system isfor the cloud, network and end system level designs of global wide-area space-based IOT applications, and the IOT new connection and management capabilities of multiple industrial mass applications are achieved.

A system for bi-directional data content transfer between a plurality of mobile platforms, such as aircraft or cruise ships, and a ground-based control segment. The system includes the ground-based control segment, a space segment and a mobile system disposed on each mobile platform. The ground-based control segment includes an antenna which is used to transmit encoded RF signals representative of data content to the space segment. The space segment includes a plurality of satellite transponders, with one of the transponders being designated by the ground-based control segment to transmit the encoded RF signals to the mobile system. The mobile system includes steerable receive and transmit antennas. The receive antenna receives the encoded RF signals from the satellite transponder, which are thereafter decoded, demodulated, D/A converted by a communications subsystem and transmitted to a server. The server filters off that data content not requested by any occupants on the mobile system.

A system for providing integrated communications, navigation and surveillance capabilities. A space segment comprises a plurality of time synchronized satellites broadcasting navigation signals and have two-way communication capabilities. A terrestrial segment comprises processing apparatus that communicates with the satellites. A user segment comprises at least one mobile user device capable of two way communication with the plurality of satellites and of using the navigation signals to derive its position. The user device is operable to inform the space segment that the user device is not receiving a navigation signal that the user device is capable of receiving.

The present invention provides a heterogeneous spacecraft network including a network management architecture to facilitate communication between a plurality of operations centers and a plurality of data user communities. The network management architecture includes a plurality of network nodes in communication with the plurality of operations centers. The present invention also provides a method of communication for a heterogeneous spacecraft network. The method includes: transmitting data from a first space segment to a first ground segment; transmitting the data from the first ground segment to a network management architecture; transmitting data from a second space segment to a second ground segment, the second space and ground segments having incompatible communication systems with the first space and ground segments; transmitting the data from the second ground station to the network management architecture; and, transmitting data from the network management architecture to a plurality of data user communities.

A conveyor having a flighted belt and providing a gapless end-off or end-on transfer of articles. The conveyor belt includes segmented flights at spaced intervals along its length. Each segmented flight includes slots dividing the flight into laterally spaced segments, or dogs. A transfer platform allows for a smooth transfer of articles onto or off the end of the belt. Fingers on the transfer platform separated by gaps extend to distal finger tips that are positioned close to the conveying surface of the belt at an end of the conveyor. The transfer platform is laterally aligned with the gaps positioned to coincide with the flight segments to permit them to pass cleanly through as the belt articulates about a sprocket set at the end of a carryway. Optional article-advancing rollers in the conveyor belt between consecutive flights propel articles forward along the belt to a forward flight.

The invention provides a waterproof zipper. In the waterproof zipper, waterproof sheet member is used as space segment linning of waterproof fastener tape, in this way, it is set near zipper teeth, and the back code is foremed on the surface of the sheet member. In the said waterproof zipper, a whole surfaces of a pair of fastener tapes(2)are covered by elastic material, and the zipper teeth(3)made of resin are integrally moulded on the opposite edge(8)and the waterproof sheet member(5)is installed in the space segment(19), therefore it extends on the right and left fastener tapes(2). The front end(30)of the sheet member(5)is set to contact with zipper teeth(3)of end. The back code(4)made of resin is moulding formed by through hole(9)installed on the side of fastener tape(2)and sheet member(5), with a clearance relative to zipper teeth(3). The back code(4)is equipped with protrusion(22), wherein the protrusion(22) has the same thickness with zipper teeth(3)on one side of superface part(24) at the space segment(19).

The invention provides a process communication method and a process communication device. The process communication method comprises the following steps: an original process serializes data sent to a target process into a memory space segment of a virtual address space; and the original process sends a data receiving message to the target process, wherein the data receiving message carries the address information of the memory space segment and the process identification of the original process. According to the process communication method and the process communication device, the execution accuracy, the execution efficiency and the communication efficiency of the process can be improved.

The invention belongs to the technical field of satellite network communication, and discloses a Walker constellation-oriented Mobius constellation topological configuration construction method, system and application. According to the implementation scheme, the method comprises the following steps: initializing parameters of Walker constellations and satellite antenna link establishment constraints, and numbering all satellites; according to the constellation parameters and the link establishment constraints, calculating a link establishment set of each satellite; searching a link establishment mode capable of establishing a Mobius constellation topological structure in the different-orbit link establishment set, and generating a link combination set; and establishing an in-orbit link andan out-of-orbit link of the Walker constellation according to the link combination set, and constructing a Mobius constellation topological structure. According to the method, the average path hop count of the satellite network is shortened, the connectivity of the network is enhanced, the average end-to-end delay of the network is reduced, and the information bearing capacity of the Walker constellation space segment is improved. According to the invention, a topology structure with optimal connectivity of the Walker constellation in a one-satellite four-chain mode is provided, the routing cost is reduced, and the cost performance of the network is improved.

The invention discloses a guidance system for vessel harboring, which comprises a space segment, a ground segment and an application segment, wherein the space segment comprises a navigation and location satellite, a mobile communication satellite and a telemetering remote sensing satellite in the stratosphere; the ground segment comprises a ground gateway station and a command center system; theapplication segment is a vessel terminal system; and location information, speed information and front channel information of the vessel obtained by three kinds of satellites during navigation are sent to the command center system through the ground gateway station, and navigation conditions, berth information and available berth information of the vessel are obtained through analysis. When the vessel sends a request of harboring to the command center system, the command center system sends guiding orders to the harboring vessel through the mobile communication satellite immediately, the harboring vessel is guided to berth, and the computer graphics (CG) technology is supplemented to master harbor berthing conditions, monitor anchoring and line mooring conditions of the vessel after berthing, and send safety warning information.

The invention relates to the field of satellite communication technologies and provides a binary diversity single-carrier transmission method based on a self-adaptive cyclic prefix. The method comprises the following steps that (1) a space segment provides information service forwarded based on processing through two co-orbital satellites, and a satellite receiver at an earth segment can synchronously receive signals of the two satellites to obtain space diversity gain; (2) inter-frame signal interference of a receiving end, which is brought by random perturbation of the satellites, is effectively resisted by utilizing a single-carrier transmission mechanism based on the cyclic prefix; (3) the satellite receiver carries out balancing and subsequent signal processing on the received signals, a specific statistical parameter is taken as an index, and the current length performance of the cyclic prefix is broadcasted to a satellite transmitting end in a manner of 1 bit; and (4) the satellite transmitting end adjusts the length of the cyclic prefix at the appointed step length according to feedback information. According to the method, when the satellite altitude is inaccurately known, lower complexity, low-speed feedback expenditure and higher transmission efficiency are achieved, and the signal diversity gain brought by binary transmission is obtained.

The invention discloses a high tension transmission line ice coating waving monitoring method based on [phi]-OTDR; the method comprises the following steps: using a [phi]-OTDR system to obtain time and space distributions of Rayleigh backscattering signals in a cable; making Fourier transform so as to obtain a Rayleigh signal spectrogram; using a least square method to respectively fitting two straight lines according to end points of fundamental frequency and higher harmonic left and right edges in the spectrogram, thus obtaining an approximation isosceles trapezoid; solving the approximationisosceles trapezoid transmission line space vibration center, and determining a space segment on which ice coating waving may easily happen; stacking components from near DC to the highest frequencyin the spectrogram, continuously reading many frequency spectrums, and splicing a high frequency energy coefficient time-space diagram; extracting a high frequency energy coefficient time domain signal, smoothing and meaning the signal, making Fourier transform so as to obtain a vibration signal period, thus obtaining transmission line waving day and night change rules, and determining the ice coating waving easy happening time period. The method can timely find out and eliminate line operation safety troubles, thus preventing mass economic losses.

A word segmentation method for segmenting a text line into word segments, which is particularly advantageous for processing italic text but can also be used for regular text. A horizontal center zone of the text line, corresponding to the vertical center parts of the characters, is used to generate a center-zone-only vertical projection profile. The center zone is determined using a horizontal projection profile, by locating the two major peaks of that profile and defining the two major peak positions as the upper and lower boundaries of the center zone. Spacing segments (white gaps) in the vertical projection profile are identified, and classified into two classes, namely character spacing (gap between characters with a word) and word spacing (gap between words). The word spacings are used to segment the text line into word segments.

A device for retaining a mercury source in the discharge space of a low-pressure discharge lamp is disclosed. The mercury source retaining device comprises a holder, which has an inner space communicating with the discharge space and a receiver opening for receiving a mercury source. The retaining device further comprises resilient clamping means for clamping the holder in a tubular space segment of the discharge space and resilient retaining means at least partially blocking the receiver opening. The resilient retaining means are adapted for allowing a passage of the mercury source in a direction towards the inner space of the holder, but block the movement of the mercury source through the receiver opening in a direction out of the holder.

The invention relates to a method for quickly querying mass vehicle passing records within a time-space range on the basis of key value cloud storage. The method comprises the steps of constructing a time and space segment point key value index table, constructing a time and space segment tree key value index table and constructing a time and space segment tree upgrading and deleting key value index table. By adopting the method, the quick vehicle passing record query efficiency based on a time-space single point is greatly improved by introducing the time and space segment point index table; the quick vehicle passing record query efficiency based on the time-space range is greatly improved by introducing the time and space segment tree index table; by introducing the time and space segment tree updating index table, the time and space segment index table can be dynamically reconstructed, and possibility is provided for supporting real-time querying of mass vehicle passing records; by introducing a key value cloud storage database to preserve the index tables and utilizing a Hadoop cloud platform to generate the index tables, the index construction and maintenance time is greatly shortened, and the query processing performance is improved.

The invention relates to a headchute positioning method based on visual scanning, and belongs to the field of computer vision and image processing combined technology. The method comprises the steps of container headchute shipping space scanning, headchute shipping space image splicing, image preprocessing and mathematically morphological headchute edge detection, headchute shipping space edge linear detection, and headchute shipping space segmenting and headchute positioning. The headchute positioning method based on visual scanning is used to position headchutes, a work mode of loading and unloading containers mainly via manual guiding traditionally is improved, the digital and intelligent levels of loading and unloading of the containers are improved, a driver can control container loading and unloading of a ship remotely and much conveniently, the working efficiency and the safety of container loading and unloading are improved, and the positioning method improves production and working environments, and is conducive to improving the working efficiency and reducing the cost.