906 results about "Ground system" patented technology

There is provided a method for improving an allocation of resources, i.e., frequency and power, to terrestrial services and satellite services that use a same frequency band. The method includes determining a demand (DS) for a resource by users of a satellite system, determining a demand (DT) for the resource by users of a terrestrial system, and allocating the resource between the satellite system and the terrestrial system based on a ratio of DS to DT.

A power and control architecture employing circuitry that sequentially regulate power flows from independent solar-array sources or a mixture of power sources providing power to a common load. The device may be used on a satellite with solar-array sources; however it may also be used on ground based systems. Stiff bus voltage regulation is obtained by tightly controlling the most recently activated power-processing channel while keeping the previously activated power-processing channels in the Maximum Power Tracking mode to supply maximum power to a common load. The remaining power-processing channels are turned off or operated in stand-by mode. In an alternative system, with primary design goal of uniform power sharing among solar-array sources, all solar array sources are activated with uniform power sharing at light load and, as load demand increases, sequentially controlled to operate in the Maximum Power Tracking mode one solar array source at a time as necessary.

A system and method of operation for efficiently reusing and/or sharing at least a portion of the frequency spectrum between a first satellite spot beam and a second satellite spot beam, and/or an underlay terrestrial network associated with a second satellite spot beam. The spectrum is efficiently reused and/or shared between respective spot beams and/or associated underlay terrestrial systems in a manner minimizes interference between the respective satellite and terrestrial systems.

A cellular communications system comprising a space based system comprising a first set of cells, and a ground based system comprising a second set of cells. The space and ground systems can optionally function substantially autonomously, with each using spectrum from at least one predetermined frequency band.

An electrical connector with electrically lossy materials bridging ground members. The lossy conductive members may be formed by filling a settable binder with conductive particles, allowing the partially conductive members to be formed through an insert molding process. Connectors assembled from wafers that contain signal conductors held within an insulative housing may incorporate lossy conductive members by having filled thermal plastic molded onto the insulatative housing. The lossy conductive members may be used in conjunction with magnetically lossy materials. The lossy conductive members reduce ground system do resonance within the connector, thereby increasing the high frequency performance of the connector.

Seamless hand-off of air-to-ground telephony calls is achieved autonomously within an aircraft by using one of at least two radio links to search for additional ground stations. The search for candidate ground stations for hand-off is expedited by eliminating ground stations exhibiting zero or negative Doppler effects. Other values indicating quality of the link corresponding to the channel over which the search is conducted is compared with the quality of the call and an alternate call is established using the call identification code previously established for the call in progress. The hand-off of the call may then be easily conducted by transferring the voice signal to the channel over which the search was conducted. This is preferably done at a time when the transmission quality of the two channels would be approximately the same or the quality improved on the channel to which hand-off is made.

Techniques for delivering data or information to a vehicle include a ground based data distribution system that has a ground based determination engine and port networks, and is communicatively connected to access networks. The ground based determination engine determines a content of the data to be delivered to the vehicle, and/or determines one or more predicted locations of the vehicle. The ground based system causes the data to be delivered to the one or more predicted locations, and, at a particular predicted location, the delivered data is transferred to the vehicle, such as by using an information distribution device that is on-board the vehicle. Determination of the data content and of the one or more predicted locations may be performed while the vehicle is en route or is at a port. Data delivery may occur while the vehicle is en route or is at a port.

A computer implemented method for an aviation system to manage, consistent with specified system business goals, the temporal assignment of airport gates for use by a plurality of aircraft which are to-be-serviced by specified ground resources, including ground personnel, equipment and supplies, so as to deliver and receive specified passengers, their baggage and cargo during a specified time period, based upon specified data pertaining to the aircraft, passengers and ground resources, includes the steps of: (a) collecting and storing the specified data, (b) processing the data to predict the trajectories of the aircraft, wherein these trajectories including the expected gate arrival time, required ground servicing period and projected departure time of each of the aircraft, (c) processing the data to predict the loads imposed on the ground resources and gates associated with the movement of the passengers, equipment and supplies in relation to the arrival and departure of the aircraft, (d) processing the data, trajectories and loads to identify the various possible ways to distribute the ground system resources and assign the gates so as to meet the time constraints of the predicted trajectories and loads, and (e) assigning to each of the plurality of aircraft a gate for use for a prescribed period, with these assignments being made in such a manner as to allow the aviation system to optimally meet its business goals.

The invention provides a flight control system, which comprises an airborne system and a ground system, wherein the airborne system comprises a miniature video camera, a GPS receiver, a GPS signal collection unit, a power supply monitoring unit, an overlapping unit and a microwave emitting unit, the miniature video camera and the GPS receiver are arranged outside an unmanned plane, the GPS signal collection unit, the power supply monitoring unit, the overlapping unit and the microwave emitting unit are arranged inside the unmanned plane, and the ground system comprises a microwave receiving unit, a video display and a remote control, wherein the miniature video camera is used for monitoring video images right ahead the unmanned plane in real time, the GPS signal collection unit is used for collecting and processing data transmitted from the GPS receiver to obtain flight parameters, the power supply monitoring unit is used for detecting and obtaining the power supply information of the unmanned plane, the overlapping unit is used for overlapping the flight parameters and/or the power supply information onto the video images, and the microwave emitting unit is used for emitting the overlapping results to the ground system. The invention can perfectly control the unmanned plane.

The invention discloses a robot airship control system for overhead line inspection and a control method thereof. The control system comprises a on-board system and a ground-based system, wherein the on-board system has a structure that: a master controller DSP is connected with various sensors, a wireless communication module, a motor drive circuit, an image processor DSP and the like through analog-to-digital conversion ports, serial ports and other ports, and the image processor DSP is connected with an infrared CCD through an HPI port; the ground-based system has a structure that: an interface singlechip is connected with a ground PC, wireless communication equipment and a manual remote controller through serial ports, I/O and other ports; the on-board system and the ground-based system are communicated through an on-board wireless communication module and a ground-based wireless communication module; and a wireless camera transmits image information to the ground-based system through wireless video signals, and displays the image information on an image monitor. The robot airship control system for the overhead line inspection has three patterns, namely an infrared vision navigation pattern, a GPS navigation pattern and a manual remote control pattern, and has the advantages of high inspection efficiency, high cruisingability and high safety.

The present invention is a clip and related grounding device. The grounding device has a wire connected to two clips at either end. Each clip is configured to be attached to the frame of a solar panel. The device eliminates fasteners that require bolts or screw to make a sufficient electrical connection between the panel frames. Because the grounding connects frame to frame, it is not necessary to ensure that the frames have a grounding connection to the underlying solar panel mounting system. This enables use of mounting systems that do not conduct electricity. The grounding device is has sufficient gripping strength that the anchoring teeth penetrate through paint, oxidized coating, or annealed finish to create an electrical connection.

The invention discloses a new method for performing fault line selection by using the characteristic of a non-power frequency transient state fault component for extracting single-phase fault zero-sequence current by using Hilbert-Huang transform (HHT). The method comprises the following steps: performing EMD decomposition on fault zero-sequence current of each feeder line by using the HHT to acquire an IMF component of the zero-sequence current of each feeder line; constructing a resolving signal according to Hilbert transform, solving instantaneous amplitude and frequency of the zero-sequence current of each feeder line, and eliminating a power frequency component in the instantaneous frequency of the zero-sequence current of each feeder line to acquire a non-power frequency fault component; and forming a line selection criterion according to the characteristics that the amplitude of the non-power frequency fault component of the fault line is greater than that of the non-fault line and the polarity of the fault line is opposite to that of the non-fault line. The line selection method is not affected by an arc suppression coil, and is applicable to non-grounded, arc suppression coil grounded and high-resistor grounded systems, overhead lines or cable lines and cable overhead mixed lines; and the line selection result shows that the method applied to low-current single-phase grounding fault line selection is accurate and reliable.

In accordance with the present invention, a method is provided whereby the transient voltages presented at the input to a watt-hour meter are suppressed to prevent damage to the watt-hour meter and to the electronic devices that are powered through the watt-hour meter. In addition to transient voltage protection, the method of the present invention also provides monitoring of the earth ground resistance, voltage and current of the earth ground conductor associated with the watt-hour meter. As such, voltage transients are suppressed when presented at the watt-hour meter through the power line input, ground resistance of the earth ground conductor in continuously monitored and the current and voltage conditions existing on the ground conductor are continuously monitored. Visual and audible indicators are provided to indicate quality issues with the grounding system and the effectiveness of the surge suppressor/arrestor.

The invention relates to a data processor system for space-based measurement and control of a high-speed aircraft. The data processor system comprises a power supply module, an interface module, a control module, an encryption module, a forward processing module and a reverse processing module, wherein the power supply module is used for providing the secondary power source for the other modules; the control module is used for receiving control instructions, and sending the control instructions to the other modules; the encryption module is used for encrypting the reverse data stream and decrypting the forward data stream respectively; the forward processing module is used for receiving the mid-frequency signal, completing the receiving and processing link, recovering forward information, and outputting the forward information to an external device through the interface module; the reverse processing module is used for receiving image data, flight state information and remote measurement information, generating the mid-frequency signal after completing the launching and processing link to output the mid-frequency signal to an external radio frequency front end, and eventually sending the mid-frequency signal to a ground system. The data processor system supports the carrier high-dynamic measurement and control of the aircraft, is large in region coverage, supports multiple users, can realize real-time two-way communication with the aircraft, and has certain interference capability.

The invention relates to a measuring post simulation method of the fault wire selection for a low current grounding system. The invention belongs to the technical field of the power system relay protection. The method is realized by that when the instantaneous value of the voltage of a bus zero exceeds the limit, a fault wire selection device is started immediately and used for recording the wave. The invention adopts a digital filter algorithm to obtain the bus zero voltage and the transient pure fault components of zero current on each feedback line. When a low current grounding system takes place a single-phase earth fault, the waveform of the zero current is quantitatively solved by using measuring post simulation according to the transient pure fault component of the measured value of the bus zero voltage and the feeder zero distribution capacitor parameter under the assumption premise of the perfect feeder of every feeder. The invention carries out correlativity analysis to compare the measured waveform of the current of every zero current with the transient pure fault component solved by the measuring simulation method under a definite data window and calculate both correlative coefficients, thereby the invention forms a line selecting criterion 1 and 2 and can carry out line selection to the system according to the line selecting criterion. The principle analysis and the simulation show that the line selection method has the advantages of accuracy and reliability.

A dumachine control system of coaxial pilotless heligyro comprises two sets of ground units and one set of heligyro unit. It is featured as forming said ground unit by control machine platform, flying control table , remote control coder, remote detection decoder, ground control computer, control emitter/receiver and control antenna; forming heligyro unit by control antenna, control emitter/receiver, control video processing combination and low speed signal regulator.

The invention provides an electromagnetic system for detecting a distance between adjacent wells while drilling, which is capable of providing accurate guide measurement and calculation for the control of well tracks of wells with complex structures, such as a cross well, a U-shaped communicated well, a dual-horizontal well, an accident rescue well and the like. The electromagnetic system for detecting the distance between adjacent wells while drilling mainly comprises a magnetic pipe nipple, an electromagnetic measuring instrument and a method for calculating the distance between adjacent wells, wherein the magnetic pipe nipple is a hollow cylinder with API standard ports at the two ends consisting of a non-magnetic drill collar and a plurality of permanent magnets, and is used as a signal source for an electromagnetic guide system; the measuring instrument mainly comprises an underground searching tube and a ground system, and is mainly used for detecting a magnetic vector signal ofthe magnetic pipe nipple and for sending data to a computer through an RS-232 interface; and the computer processes and analyzes measured information by using the method for calculating the distance between adjacent wells so as to convert the measured information of a drill position into readable data for engineers. The electromagnetic system for detecting the distance between adjacent wells while drilling has a simple structure and convenient use, and provides an effective high and new technological measure for the detection and control of the distance between adjacent wells with complex structures.

The invention discloses an integrated grounding system for a medium-and-low-speed maglev train. The integrated grounding system comprises a power supply system grounding protection device, a safety grounding protection device and an electric leakage detection device, wherein the power supply system grounding protection device is arranged in a transformer substation, and the safety grounding protection device and the electric leakage detection device are mounted on the train. The electric leakage detection device is grounded through the safety grounding protection device. The integrated grounding system further comprises an induced current filter device. The induced current filter device is arranged between the train and a negative-electrode contact rail of a contact rail transmitting power and is used for receiving induced current generated during running of the train and outputting the induced current to the negative-electrode contact rail so as to filter induced current in the train. Induced current generated by a direct-current motor during running of the train can be filtered, and accordingly, interference on electronic equipment such as the maglev train system, the signal system and the running control system from the induced current of the direct-current motor is eliminated. Besides, the integrated grounding system has the advantages of simple structure, low cost, low electromagnetic interference, safety, reliability and the like.

A waterway shield system comprises a plurality of autonomous underwater nodes wherein each underwater node comprises acoustic detectors which may comprise horizontal and/or vertical acoustic arrays which may be directly mounted thereto or extend outwardly therefrom. Each underwater node comprises an acoustic modem for transmitting high resolution acoustic data to a gateway node that provides a connection to a surface system and a network of other underwater nodes in other waterways. The data from the underwater nodes may be utilized to produce acoustic attribute data for hulls of ships in the waterways. An acoustic database is provided that compiles the predetermined acoustic attribute data for a variety of ships and other entities thereby providing previously stored identifying means. The acoustic database is utilized in conjunction with one or more databases of other physical attributes of ships or other objects to thereby provide an automated identification process.

The invention provides a single-phase ground fault section positioning method of a small-current ground system. The single-phase ground fault section positioning method comprises the steps of: 1) when the small-current ground system has a single-phase ground fault, recording zero-mode current of a previous cycle and zero-mode current of a next cycle at the moment when the single-phase ground fault occurs; 2) after a pure fault component of transient zero-mode current at the moment when the single-phase ground fault occurs is decomposed through an empirical mode, selecting out a highest-frequency intrinsic mode function component; 3) according to energy spectrum entropy of the highest-frequency intrinsic mode function component of each detection point, obtaining energy spectrum entropy factor values of the highest-frequency intrinsic mode function component of each detection section; and 4) conducting cluster analysis to sample set data consisting of the energy spectrum entropy factor values through a fuzzy C-means clustering method, determining a kind of sections which occur the most as a sound kind, i.e. sound sections, and determining a kind of sections which occur the least as a fault kind, i.e. fault sections. The single-phase ground fault section positioning method of the small-current ground system has the characteristics of high detection accuracy and good universality, and can be widely used in power systems.