41 results about "Very-small-aperture terminal" patented technology

The invention discloses a bandwidth reservation-based very small aperture terminal (VSAT) satellite communication system bandwidth distribution method, and relates to the technical field of satellite communication. In the method, different applications are endowed with different priorities based on the conventional bandwidth reservation-based dynamic bandwidth distribution method, and the high-priority application can occupy the bandwidth section occupied by the low-priority application, vice is not; and in actual distribution, when the bandwidth section corresponding to the application has no enough idle bandwidth, and the bandwidth sections with low priorities are searched in turn from high priorities to low priorities. The method keeps the advantages of the conventional bandwidth reservation-based dynamic bandwidth distribution method such as simple implementation, few channel fragments and high distribution speed, coordinates different QoS (quality of service) demands and application scenes, realizes effective management of channel resources, improves the utilization rate of satellite channel resources in a network environment of multiple service types, meanwhile, simplifies star-earth interaction and reduces the time delay caused by bandwidth distribution.

An approach for providing flow control in a radio communication system is disclosed. A request from a non-satellite system specific side of a transport interface is made to a system specific side of the transport interface for a flow control allocation that specifies an amount of data to be stored in a queue of the system specific side of the transport interface. The system specific side supports a signaling function that is based on a transmission characteristic of the radio communication system. The flow control allocation is generated based upon availability of the queue, wherein the destination address is a link layer address of the satellite communication system. This arrangement has particular applicability to a satellite network (e.g., Very Small Aperture Terminal (VSAT) network) that provides data communication services.

DVB-S/S2 transmodulator for VSAT units employing IP based communication. The transmodulator is optimized for VSAT networks, enabling legacy VSAT units to benefit from the developments of the advanced DVB-S2 standard. The transmodulator appears transparent to the legacy VSAT unit that is configured to operate with the older DVB-S standard. Some embodiments offer a unique feedback channel allowing the transmodulator to send messages and information to the ground station via the VSAT itself.

Provided is a maritime communication system and method. A ship station of the maritime communication system may receive, from a maritime broadcast base station, maritime configuration information that includes setting information of shore base stations and setting information of maritime ship stations, may establish a radio link when a radio link configurable shore base station is present, may set the radio link through a radio link configurable neighbor ship station when the radio link configurable shore base station is absent, and may establish the radio link with an internal maritime satellite (INMARSAT) or a maritime very small aperture terminal (MVSAT) when the radio link configurable shore base station is absent and when the radio link configurable neighbor ship station is absent.

The invention discloses a satellite communication-based earthquake real-time monitoring system, which comprises a control center sub-system, a monitoring center sub-system, a displacement sensing sub-system, a solar power supply sub-system, a satellite global positioning system (GPS) high-precision positioning sub-system, a satellite GPS precision time service sub-system and a very small aperture terminal (VSAT) satellite communication sub-system. The three-dimensional measurement of earthquake waves in horizontal and vertical directions is realized by displacement sensor technology; equipment at all monitoring points is supplied with solar power; the three-dimensional navigation and positioning of the monitoring points are realized by using the GPS high-precision positioning technology with high anti-interference; the GPS precision time service system is used, so that the control center and all the monitoring points have the synchronous clock signals with the same frequency and the same phase; and the seamless coverage and networking of the monitoring system across China are realized by using the VSAT satellite communication technology.

The invention discloses a paired carrier multiplexing multiple-user access method comprising the following steps: arranging a network control carrier, a plurality of user access carriers and a plurality of service carriers in a very small aperture terminal (VSAT) satellite communication network, and allotting channels for a paired carrier multiple access (PCMA) user. The network control carrier comprises a time and frequency reference channel, a system state channel, a service distribution channel and a broadcast channel; each of the user access carriers comprises a user login application channel and a user response channel; each of the service carriers comprises a user communication service channel; each of the service carriers is divided into a plurality of time slots according to the time division multiple address (TDMA) mode; each of the time slots is a service frame; every 32 service frames form 1 super frame; and each of the super frames has a length of 320 ms. Before the channels are allotted for the PCMA user, the PCMA primary party logs in to apply for the channels, the network control center calls the PCMA secondary party, and the network control center allots the frequency and the time slots occupied by the signals of both the PCMA primary party and the PCMA secondary party and the logout indications of both the PCMA primary party and the PCMA secondary party if the PCMA secondary party responds to the network control center.

An approach is provided for communicating in a meshed network including a first terminal and a second terminal. A request from the first terminal for obtaining address information of the second terminal is submitted to a hub. The hub generates a response including the address information and the context information that specifies capabilities of the second terminal. This arrangement has particular applicability to a satellite network (e.g., Very Small Aperture Terminal (VSAT) network) that provides data communication services.

The invention provides a system for real-time monitoring earthquakes. The system comprises a control center subsystem, a monitoring center subsystem, a satellite global position system (GPS) high precision positioning subsystem, a satellite GPS precision time service subsystem and a very small aperture terminal (VSAT) satellite communication subsystem; the capacities of three-dimensional navigating and positioning monitoring points are achieved by adopting a GPRS high precision positioning technology, thus the system has good anti-interference; by adopting the GPRS high precision positioning technology, the monitoring centre and each monitoring point have a synchronous clock signal of the same frequency and same phase; the seamless covering and networking of the monitoring system are achieved in national range by adopting the GPS precision time service system; and the VSAT satellite communication subsystem comprises a main station (control center), a satellite and 1-k numbered VSAT terminals (shift monitoring points).

The invention discloses a VSAT (Very Small Aperture Terminal) network time synchronization method. The method comprises a reference station NCR (Network Clock Reference) transmission module and an earth station NCR receiving synchronization module, wherein the earth station NCR receiving synchronization module comprises an NCR extracting module, a local clock counting module, a phase discrimination module, a two-odor loop filter, a frequency control word addition module, a DA (Digital to Analog) module, a VCO (Voltage-controlled oscillator) module, a flash memory storage module and a delay compensation module. Through adoption of the VSAT network time synchronization method, frequency and time synchronization can be realized rapidly, and meanwhile a power-down memory function is realized.The method has relatively high practicability and creativity.

A satellite communication system and method based on a digital video broadcasting-return channel via satellite (DVB-RCS) are provided. The satellite communication system may include a central station, and at least one very small aperture terminal (VSAT) including a first VSAT and a second VSAT. When a logon request is received from the second VSAT, the central station may determine whether the first VSAT is normally operated. When the first VSAT is determined to be abnormally operated, the central station may allow the second VSAT to log onto the central station.

The present invention relates to a satellite signal transmitter, and in particular, to a satellite signal transmitter with a dual-input DC power control switch.

The invention discloses a method for controlling switching of VSAT (Very Small Aperture Terminal) satellite communication L-band up and down converters, comprising the following steps of: step 1, system initialization; step 2, entering into a waiting state; and if an input command is detected in the waiting state, entering into step 3; step 3, command determination, and if the determination is true, starting step 4, otherwise, returning to the step 2; step 4, command processing; and step 5, control event processing, and returning to the step 2 if processing is finished. The invention also discloses a device for controlling switching of the VSAT satellite communication L-band up and down converters. With the method and device for controlling switching of the VSAT satellite communication L-band up and down converters provided by the invention, quick control is realized for the control of related modules of the up converter and the down converter, and parameter adjustment and control; real-time operation is realized for the input instructions; the parameter adjustment time is shortened; and the operation reliability and keenness of the satellite signal transmitting/receiving equipment are enhanced.

The invention discloses an integrated service processing method and system of a satellite communication network. The method comprises: obtaining a service order, sending service provisioning instructions to a satellite direct broadcast system, a very small aperture terminal and a remote education system according to the product types and/or service types in the service order, wherein the service provisioning instructions are used for provisioning services corresponding to the service types, receiving the feedback information returned by the satellite direct broadcast system, the very small aperture terminal and the remote education system, wherein the feedback information represents whether to provision the services. Through the method, the satellite direct broadcast system, the very small aperture terminal, the remote education system and so on can be effectively and uniformly scheduled, therefore multi-service and multi-system scheduling and monitoring can be realized, and further, the service processing efficiency of the system is promoted.

The invention discloses a remote photovoltaic power station cloud monitoring system for VSAT (Very Small Aperture Terminal) satellite communication. The system comprises a plurality of intelligent photovoltaic modules, a data processing terminal, a VSAT satellite communication network, a data server, a solar photovoltaic power station remote monitoring system and a cloud side. A user can realize the real-time monitoring and the automatic and intelligent management of a monitored area on a remote PC (Personal Computer) terminal and the use scheme of a photovoltaic power station is intelligently determined through the cloud side. The remote photovoltaic power station cloud monitoring system for VSAT satellite communication has the advantages that the labor cost can be reduced, the continuity and the reliability of data acquisition are improved and the working efficiency is greatly improved, the system is economic and stable and is not restricted by geographical locations, and the like.

The invention discloses a multi-mode VSAT (Very Small Aperture Terminal) satellite communication signaling parsing system and a parsing method. The system comprises a signal receiving module and a data processing module, wherein the signal receiving module is used for receiving data forward and inputting the data into the system, and the data processing module is used for processing the data. The characteristics lie in that the system further comprises a frame type library, the frame type library is used for storing feature frames under different communication protocol modes, the feature frames are used for acting as a standard for judging whether data frames in the received data belong to data frames under corresponding communication protocols or not, and the judgment process is executed in the data processing module. The multi-mode VSAT satellite communication signaling parsing system provided by the invention is provided with the frame type library which can store multiple types of protocol feature frames, and screening and differentiation for different protocol type data are realized. Meanwhile, a new frame type write-in port and an original frame type modification port provided by the frame type library can enable frame types to be modified and corrected continuously and to be updated timely.

A method for controlling a VSAT (Very Small Aperture Terminal) satellite communication L-band down converter, comprising the following steps of: step 1, system initialization; step 2, entering the waiting state; and if an input command is detected in the waiting state, starting step 3; step 3, command determination, and if the determination is true, starting step 4, otherwise, returning to the step 2; step 4, command processing; and step 5, control event processing, and returning to the step 2 if the operation on the down converter is finished. The control event processing in the step 5 comprises processing of the following events: preselector setting, medium-frequency bandwidth setting, AGC/MGC (Automatic Gain Control/Manual Gain Control) control, first local oscillator frequency control and second local oscillator frequency control. With the method for controlling the VSAT satellite communication L-band down converter provided by the invention, smart control is realized for receiving of the input instruction, automatic control of related modules of the down converter, and corresponding parameter adjustment; real-time operation is realized for the input instructions; the parameter adjustment time is shortened; and the operation reliability and keenness of the down converter are enhanced.

The invention discloses an intelligent energy efficiency monitoring system and method for a twenty-thousand-ton bulk cargo ship. The system comprises a twenty-thousand-ton bulk cargo ship, an intranet, a man-machine interaction terminal, a firewall, a satellite communication controller, a very small aperture terminal and a land shore base station. The invention is mainly characterized in that an intranet is built in a twenty-thousand-ton bulk cargo ship, a man-machine interaction end is arranged in the intranet, one end of the firewall is connected with the man-machine interaction end, the other end of the firewall is connected with one end of the satellite communication controller, the other end of the satellite communication controller is connected with one end of the very small apertureterminal, and the other end of the very small aperture terminal is connected with the land shore base station. The ship energy consumption monitoring system has the beneficial effects that alarm prompt is carried out on energy consumption which is consumed in an out-of-range mode, communication with shipyards and ship shops can be provided so as to facilitate technical support and diagnosis decision making, and therefore the ship can operate with the minimum energy consumption.