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2042results about How to "Long transmission distance" patented technology

Intelligent traffic control system for controlling access connection traffic flow

The invention relates to an intelligent traffic control system for controlling traffic stream in intersection. The control system is composed of a traffic signal controller, a center computer, an Ethernet communication system, a traffic lamp in intersection, and related equipment. The traffic signal controller adopts a high-accuracy real-time clock chip for providing accurate clock signal and effectively improving the accuracy of time sequence of lamp color and simultaneously can display and set time and calendar information. The traffic signal controller has a vehicle inductive detection control interface for inputting real-time traffic stream information. The microprocessor of the signal controller system can an I / O port expanded by a programmable logic controller CPLD and is used for driving the traffic lamp after photoelectrical isolation and drive circuit so as to achieve reliable color output of traffic lamp. In the invention, the signal controller is directly connected with the Ethernet through the Ethernet controller, which can effectively improve the data transmission real-time performance and reliability. The monitor center analyzes and processes the traffic stream data according to the history traffic stream information as well as the real-time traffic stream information of each intersection, and generates an optimal control scheme by an intelligent optimization method, thereby achieving regional coordination control of urban traffic stream and maximally improving the traffic efficiency of the urban traffic stream.
Owner:SHENZHEN OPLINX ELECTRONICS TECH

SF6 high-voltage circuit breaker state intelligent monitoring and health management system

The invention relates to an SF6 high-voltage circuit breaker intelligent monitoring and health management system which comprises hardware and software, wherein the hardware is divided into a lower computer and an upper computer; the lower computer hardware comprises an intelligent control and processing unit based on an FPGA and an ARM, a data acquisition unit, a data storage unit, an intelligent control output unit and a CAN bus communication unit; the upper computer hardware consists of a monitoring center server unit and a PCI 1680U board card; and the communication between the upper computer and the lower computer is realized by a CAN bus network. The software is also divided into a lower computer and an upper computer, wherein the lower computer software is in charge of driving the lower computer hardware to complete mechanical, electrical and insulating state data acquisition and feature extraction, realizes intelligent reasoning and intelligent control by combining system information, and drives the CAN bus communication unit to send the result obtained by processing into the upper computer; and the upper computer software is in charge of driving the PCI 1680U board card of the upper computer to complete communication, and realizes the man-machine interaction interface and intelligent monitoring information management. The system realizes the comprehensive monitoring for the SF6 high-voltage circuit breaker state and performance.
Owner:BEIHANG UNIV

Mine mobile communication system

The invention discloses a mine mobile communication system, which consists of an Ethernet passive optical network of a double-bus or double-loop structure, a wireless access network, a control system and an explosion-proof mobile station. The system comprises an optical link terminal, a base station controller, a ground base station, office-end equipment, passive optical splitters, explosion-proof optical network terminals, an underground explosion-proof base station, leakage antennae, base station antennae, distributed antennae and the explosion-proof mobile station, wherein the optical link terminal is connected with the ground base station and the base station controller; the explosion-proof optical network terminals are connected with the underground explosion-proof base station; the underground explosion-proof base station is connected with the leakage antennae, the base station antennae and the distributed antennae; and the explosion-proof mobile station is connected with the underground explosion-proof base station and the ground base station through a wireless interface. The mine mobile communication system has the characteristics of simple structure, flexible deployment, convenient maintenance, relatively lower cost, strong disaster resistance and anti-jamming capacity, capability of eliminating dead zones in communication and meeting requirements on a specific service environment and security for mining, and suitability for underground mobile communication in a coal mine.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)

System and method for detecting fire hazard based on wireless multi-sensor information fusion

The invention provides a system and a method for detecting a fire hazard based on wireless multi-sensor information fusion. The system comprises a sensor terminal node and an intelligent gateway, wherein the sensor terminal node establishes a data transmission network of a fire hazard monitoring field by using the ZigBee technology; the intelligent gateway is accessed into the Internet and a general packet radio service GPRS (general packet radio service) network based on an ARM11S3C6410 (Advanced RISC Machine 11S3C6410) chip; and a user can obtain the monitoring information while accessing to an embedded server. Once the fire hazard is detected, the alarm information is transmitted to a cell phone of the user through a GPRS module; a plurality of sensors of smoke, temperature, carbon monoxide CO gas and the like are utilized to sense the burning state of the fire; different trust degree functions are distributed according to that whether the fire hazard happens; and a D-S evidence theory is fused with three sensor information so as to judge the state of the fire hazard. With the adoption of the system and the method, the defect of wired scheme of a traditional fire hazard monitoring system is modified; and the system and the method can be used in families and industrial environments with wiring inconvenience and reduced cost widely.
Owner:CHONGQING UNIV

Debugging method for +/- 800 kV ultra-high voltage direct-current transmission project system

The invention relates to a debugging method for a +/- 800 kV ultra-high voltage direct-current transmission project system. The system comprises convertor stations at two ends and a direct-current transmission line. The debugging method for the +/- 800 kV ultra-high voltage direct-current transmission project system comprises the following steps that (I) the +/- 800 kV ultra-high voltage direct-current transmission project system is subjected to calculation and analysis; (II) a debugging scheme for the +/- 800 kV ultra-high voltage direct-current transmission project system is formed; (III) a debugging plan for the +/- 800 kV ultra-high voltage direct-current transmission project system is made; (IV) the +/- 800 kV ultra-high voltage direct-current transmission project system is subjected to a field debugging test; (V) the +/- 800 kV ultra-high voltage direct-current transmission project system is subjected to a pilot run; (VI) the +/- 800 kV ultra-high voltage direct-current transmission project system is subjected to a debugging summary. According to the debugging method for the +/- 800 kV ultra-high voltage direct-current transmission project system, a single current converter and a monopolar and bipolar system debugging test are combined for the first time, therefore, the efficiency of a system debugging test is improved, the system debugging speed is increased, good conditions are created for finishing system debugging in advance, and experience and reference are provided for the debugging of a direct-current transmission project system in future.
Owner:STATE GRID CORP OF CHINA +1

Self-tracking servo control system for flat plate with high integration and high precision

The invention discloses a self-tracking servo control system for a flat plate with high integration and high precision. The self-tracking servo control system comprises a monitoring computer, a servo controller, a PWM driver, a direct current motor, a speed measurer, a transmission mechanism, a rotary transformer, a flat plate antenna and a support rotating mechanism, wherein the monitoring computer receives working conditions and issues control commands; the servo controller receives the control commands issued by the monitoring computer, reads antenna angle position information and receiver angle error information, closes a position loop, tracks the closed loop, and outputs analog controlled quantity to the PWM driver; the PWM driver closes a speed lop and a current loop to drive the direct current motor to further drive the flat plate antenna by the transmission mechanism to rotate; the flat plate antenna receives high frequency telemetry signals; the transmission mechanism, the flat plate antenna and the support rotating mechanism jointly constitute an antenna pedestal; the servo controller, the PWM driver, the direct current motor, the speed measurer, and the rotary transformer are installed on the antenna pedestal; the self-tracking servo control system has the advantages of small volume, light weight, low energy consumption and high integration level.
Owner:BEIJING RES INST OF TELEMETRY +1

Integral wired-wireless optical fiber asymmetric full-duplex access method and system

InactiveCN103051385AEnable selective accessImprove transfer data rateRadio-over-fibreLow speedOptical polarization
The invention discloses an integral wired-wireless optical fiber asymmetric full-duplex access method and system. A light with the frequency being f0 is divided into two beams; one beam is modulated by a high-speed QAM (Quadrature Amplitude Modulation) millimeter-wave signal single side band with the frequency being fRF to generate a light carrier OLO1 (Optical Line Output 1) and a signal side band BBD with same polarization; and the other beam is inhibited and modulated by a local oscillator carrier with the frequency being fRF to generate an OLO2 with the same frequency as the BBD, after the OLO2 is orthogonal and combined with the OLO1, excess optical frequency components are filtered, and a downward infusion optical signal is generated. The infusion optical signal is transmitted to a base station through optical fiber, and can provide wired or wireless access. When the base station is accessed in a wired manner, a wavelength interpolation device separates the OLO2, the BBD from the OLO1, the OLO2 is subjected to coherent demodulation so as to obtain a downlink baseband signal, and the OLO1 carries an uplink low-speed signal and is back to a central station through the optical fiber; and when the base station is wirelessly accessed, a polarization beam splitter separates the OLO1, the BBD and the OLO2, the OLO1 is an optical millimeter-wave signal and is converted to electrical millimeter-wave through a photoelectric detector, and the OLO2 carries an uplink low-speed millimeter-wave signal and is back to the central station through the optical fiber, so that wired or wireless asymmetric full-duplex access is realized.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Positioning system and method in ship compartment

The invention discloses a positioning system and method in a ship compartment. The positioning method comprises the following steps: transmitting information including ID, a transmitting signal intensity value and the like through broadcast frames by positioning beacons arranged in the compartment; enabling people carrying positioning tags to enter the compartment, scanning and receiving ID of themultiple positioning beacons and a receiving signal intensity value RSSI by Bluetooth modules of the positioning tags, and then sending out the information and positioning tag ID wirelessly through aLoRa module; and receiving the information sent out by the positioning tags and then forwarding the information to a positioning server by a communication base station, calculating the value of the distance between each positioning tag and the corresponding positioning beacon by the receiving signal intensity value and the transmitting signal intensity value, and then acquiring the position information of the positioning tags in the compartment through a positioning algorithm. The positioning system can stably run in a severe environment which is high in dust concentration, obvious in vibration and large in noise and is filled with paint volatiles, the positioning precision can be high, and positioning requirements in a construction environment can be met.
Owner:SHANGHAI SHIPBUILDING TECH RES INST +1

System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network)

The invention discloses a system and a method for achieving network reconfigurability of a mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network). In the system, one optical line terminal is adopted and is sequentially connected with n remote end nodes through double fiber feeder lines, and all remote end nodes are respectively connected with m optical network units by using a shunt through distributed optical fibers; wherein each remote end node adopts one reconfigurable optical add/drop multiplexer based on a wavelength blocker and a tunable optical filter technology so as to realize the function of reconfiguring a network downlink signal wavelength resource, the reconfiguration of an uplink is realized by utilizing a wavelength re-modulation technology based on a reflection type semiconductor optical amplifier, and meanwhile, the system can improve the network reconfiguration property when confronting certain optical fiber faults. The method ensures that in the network, the wavelength resource of the network can be flexibly reconfigured according to changing bandwidth requirements, and meanwhile, the reconfiguration capability of the mixed PON on confronting emergencies can be realized by using one backup feeder line optical fiber loop and a series of switch transformation, thereby ensuring the network to be with better reliability.
Owner:SHANGHAI UNIV

Responder

ActiveCN101442335ASolve the problem of real-time monitoring of working statusStrong penetrating powerTransmissionRailway signalling and safetyCommunication interfaceCommunication link
The invention discloses a responder, and belongs to the field of railway communication signal equipment. The responder comprises a responder onboard equipment communication interface unit and a responder roadside electronic equipment interface unit, wherein the responder roadside electronic equipment interface unit is provided with a responder information loopback interface module; the responder onboard equipment communication interface unit and the responder roadside electronic equipment interface unit are in communication link to send message data to onboard equipment; and the responder roadside electronic equipment interface unit and the responder onboard equipment communication interface unit of the responder are in communication link to connect and communicate with roadside electronic equipment, to receive message data output by the roadside electronic equipment and transmit the message data to the onboard equipment through the onboard equipment communication interface unit, and to output and transfer information reflecting working conditions of the responder and activation to the roadside electronic equipment through low-frequency signals generated by a responder information loopback interface module. The responder can feed back the signals accurately, and the communication distance can reach more than 4 kilometers.
Owner:SIGNAL & COMM RES INST OF CHINA ACAD OF RAILWAY SCI +1

Synchronous control method for heavy-duty locomotive signal based on ATP/ATO (Automatic Train Protection/Automatic Train Operation) equipment

The invention provides a synchronous control method for a heavy-duty locomotive signal based on ATP / ATO (Automatic Train Protection / Automatic Train Operation) equipment. The synchronous control method is characterized by comprising the following steps of: synchronously controlling the power distribution of a train, and synchronously transmitting wireless data, wherein each locomotive is provided with a set of identical ATP / ATO equipment for grouping; the locomotive at one end in running direction is used as the main control locomotive for the train and responsible for the communication with a train control dispatching center; meanwhile, the main control locomotive is used for calculating the power distribution according to the line conditions and the grouping conditions and transmitting a synchronous control command to a slave control locomotive; after receiving the command from the main control locomotive, the slave control locomotive can synchronously apply traction force or braking force; and a GSM-R (Global System for Mobile Communications for Railway) digital mobile communication network is adopted as a wireless communication synchronization link of the locomotive signal according to the control command between the main control locomotive and the slave control locomotive. By implementing the synchronous control method for the heavy-duty locomotive based on the ATP / ATO equipment, the safety and the reliability of the control system are greatly improved.
Owner:NANJING NRIET IND CORP

LoRa-based remote pig house environment multi-parameter measurement and control system and method thereof

The invention discloses a LoRa-based remote pig house environment multi-parameter measurement and control system and a LoRa-based remote pig house environment multi-parameter measurement and control method thereof. The LoRa-based remote pig house environment multi-parameter measurement and control system comprises a LoRa terminal, an aggregation node and a pig house group master server, wherein the LoRa terminal comprises a data acquisition module, a power supply module, a controller module, an execution device and a camera module; the aggregation node comprises a LoRa module and a GPRS module; the pig house group master server comprises an on-site monitoring computer, a database module and a functional module; the data acquisition module, the power supply module and the execution device are connected with the controller module, the controller module is connected with the LoRa module via a wireless network, and the GPRS module is connected with the remote master server via an Ethernet.The functional module of the system is capable of displaying pig house on-site videos and environmental parameter values of corresponding points, so that a farmer can log into a website to check theon-site condition of a pig house remotely, thereby realizing intelligent farming. The LoRa-based remote pig house environment multi-parameter measurement and control system and the LoRa-based remote pig house environment multi-parameter measurement and control method combined with a LoRa wireless technology can realize the function of acquiring data of a plurality of terminals and simple networking, are suitable for environment monitoring of livestock breeding farms and have the advantages of remote data acquisition and low power consumption.
Owner:JIANGSU UNIV

Full-duplex wired/wireless hybrid access method and system based on passive optical network (PON)/RoF

InactiveCN102710333AReduce the effects of dispersionReduce bandwidth requirementsRadio-over-fibreCarrier signalRadio frequency
The invention discloses a full-duplex wired/wireless hybrid access method and system based on a passive optical network (PON)/RoF. A radio frequency local oscillator modulates optical waves to generate sidebands through an optical modulator, one path of sideband polarization is separated to form an orthogonal branch B1 and an orthogonal branch B2, the other path of sideband polarization is separated to form an orthogonal branch B3 and an orthogonal branch B4, the B1 is used for a downlink data signal, the polarization of the B3 is adjusted to be parallel to that of the B1, the B1, B2 and B3 are coupled to generate fused optical signals, the fused optical signals are transmitted to a base station through optical fibers; and the B4 is reserved into an optical local oscillator for demodulating an uplink signal. A wireless access scheme of the base station is that quadruple optical millimeter waves and uplink carrier B2 are separated through a polarization beam splitter, and a wired access scheme of the base station is that common-frequency branches B1 and B2 and uplink carrier B3 are separated through a wavelength interleaved optical filter, and coherent demodulation of the branches B1 and B2 is realized. The reserved uplink optical carriers respectively can be used for bearing uplink wired or wireless signals, the uplink wired or wireless signals are transmitted to a central station and are demodulated through the optical fibers, and a full-duplex RoF link is finished.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Micro-inertia measuring device based on ZigBee wireless singlechip

The invention discloses a micro-inertia measuring device based on a ZigBee wireless singlechip, which at least comprises a six-axis micro-inertia sensor, a signal plate and a battery compartment. The six-axis micro-inertia sensor is used for collecting three-axis gyroscope signals and three-axis accelerometer signals according to a control instruction received from a processor module in the signal plate and outputting the collected three-axis gyroscope signals and the collected three-axis accelerometer signals to the processor module in the signal plate; the signal plate is used for controlling the six-axis micro-inertia sensor to collect the three-axis gyroscope signals and the three-axis accelerometer signals, controlling a three-axis magnetic field meter module in the signal plate to collect three-axis magnetic field meter signals, processing the collected data signals and carrying out strapdown analysis to obtain a gesture and a course transported to a movement carrier; and the battery compartment is used for placing a battery for supplying power for the device. The micro-inertia measuring device based on the ZigBee wireless singlechip has the advantages of high precision, low power consumption, small volume, light weight and good real-time and has the function of long-distance wireless transmission.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI
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