397results about How to "Realize long-distance transmission" patented technology

The invention discloses a multiuser QKD network system based on an M-Z interferometer, and a secret key distribution method thereof. The system comprises a mesh network structure unit and N M-Z type quantum secret key distribution units. The mesh network structure unit comprises public fibers, wavelength router devices and special-purpose fibers. One port of any one wavelength router apparatus is connected with one public fiber and is respectively correspondingly connected with other wavelength router devices through the special-purpose fibers. The N M-Z type quantum secret key distribution units are connected with the mesh network structure unit through the public fibers, and any one M-Z type quantum secret key distribution unit can communicate with other M-Z type quantum secret key distribution units through the mesh network structure unit, such that simultaneous communication among users is realized. The system provided by the invention is simple in integral structure, realizes intercommunication between any two users and among N users, is less influenced by an increase of the user number in terms of single-channel performance, and has quite good full-network expansibility and security.

This invention relates to a diversity receiving system for total digitalized space optical communication array signals including a host receiver and multiple under communication receivers mounted on the rotation unit of each universal shaft, each receiver includes a following module and a communication receiving module, the host receiver includes a host signal process module, each under communication receiver scans and follows signal sources on the total space angles independently and communicates with it, which can be used in the rigorous spacial laser channels including atmosphere sea channels of satellite and sea channels for under water target.

The invention discloses a dual-frequency receiving antenna and a dual-frequency rectifying antenna. The dual-frequency receiving antenna and the dual-frequency rectifying antenna are used for solving the problems that an existing dual-frequency receiving antenna is large in size and small in gain, an existing dual-frequency rectifying antenna is large in size, can not receive weak energy and is not suitable for remote transmission, and a rectifying circuit is poor in reliability. The dual-frequency receiving antenna comprises a rectangular radiating patch. A Z-type groove used for achieving dual-frequency characteristics is formed in the radiation patch. The lower end of the radiation patch is sequentially connected with a dielectric substrate layer and a metal earth plate through a coaxial line. The coaxial line is in circuit connection with the rear end of the radiation patch. An air dielectric layer is formed between the radiation patch and the dielectric substrate layer. The portions, arranged between the radiation patch and the dielectric substrate layer, outside the coaxial line are provided with metal sheets in a bilaterally-symmetric mode. The upper ends of the metal sheets are connected with the radiation patch. The lower ends of the metal sheets are connected with the dielectric substrate layer. One end face of the radiation patch is further connected with the metal sheets connected with the dielectric substrate layer. The dual-frequency receiving antenna and the dual-frequency rectifying antenna can be widely applied in the fields of communication, medical treatment, industry and the like, for microwave power transmission.

The invention discloses a digital radio-frequency remote system applied to a double-communication system. The system comprises a digital optical fiber radio-frequency remote frequency-selecting near-end machine and a digital optical fiber radio-frequency remote frequency-selecting far-end machine connected through an optical fiber, wherein the digital optical fiber radio-frequency remote frequency-selecting near-end machine comprises a global system for mobile communications (GSM) near-end downlink, a data communication system (DCS) near-end downlink, a GSM near-end uplink, a DCS near-end uplink, a near-end digital signal processing module and a near-end monitoring module; and the digital optical fiber radio-frequency remote frequency-selecting far-end machine comprises a GSM far-end downlink, a DCS far-end downlink, a GSM far-end uplink, a DCS far-end uplink, a far-end digital signal processing module and a far-end monitoring module. The system can simultaneously work at high power under two communication systems of GSM and DCS, can simultaneously realize monitoring function of the GSM and DCS, and meets related performance index requirements.

The invention discloses a precision measurement device for tree walk increment. The device can measure the diameter of a tree in real time and reduce errors. The measurement device comprises a support, a magnetic railing ruler, a sensor clamp, a micron-level displacement sensor and a signal transmission processing circuit. According to the support, the diameter is measured through a three-point method, and two parts are assembled to form a V-shaped body with an included angle ranging from 90 degrees to 150 degrees. With the combination of micron-level displacement sensor arranged at the coinciding position of diagonals of the V-shaped angle, measurement of the tree walk is achieved. The micron-level displacement sensor and the magnetic railing ruler conduct remote data transmission with an upper computer through the signal transmission processing circuit. By means of the precision measurement device for tree walk increment, the tree walk and the micro-change amount of the tree walk can be stably measured at the same time and in real time, and the measurement errors are reduced. The device applies small pressure on plants, and the device is simple in structure, convenient to use, light in weight, small in size and easy to carry.

The invention discloses a running abnormality self-checking and data transmission system for an autonomous navigation type underwater robot. A technology of combining a running abnormality self-checking and control module based on a digital signal processor (DSP) and 802.11 Ethernet wireless communication is adopted to detect whether the underwater robot runs abnormally, a carried water quality sensor obtains various water quality parameters, and due to real-time detection of the running abnormality self-checking and control module of the DSP, the effective and accurate water quality parameters can be obtained. The running abnormality self-checking and data transmission system is particularly suitable for a water quality detection system which is large in data information due to the facts that the water quality parameters and test points are many and the communication distance is far, and even if the underwater environment is complex or an autonomous underwater vehicle (AUV) is abnormal, a base station can be timely notified so as to make response decisions.

The invention discloses a giant die forging hydraulic press column stress acquisition device, which is characterized in that a sensor bracket is arranged on an upright column; a displacement sensor is arranged on the sensor bracket; one end of a displacement connecting rod is sleeved in a through hole of the sensor bracket and positioned below the displacement sensor; and the other end of the displacement connecting rod is fixedly arranged on the upright column. The invention also discloses a giant die forging hydraulic press column stress monitoring system, which comprises the giant die forging hydraulic press column stress acquisition device, an analog-to-digital converter and a microprocessor; and the industrial fieldbus technology is adopted to achieve fully digital communication of the detection system. By effectively monitoring the hydraulic press working column stress conditions in a real-time manner, the invention greatly improves the safety, reliability, application and maintenance efficiency, thus extending the service life of the giant die forging hydraulic press.

The invention discloses a digital fabrics density detector and a testing method, the device includes a host machine, a bracket with a perforation on the end face, which is equipped in front of the host machine, a fabrics amplifying component, a CCD photoelectric coupled device, an image conversion circuit as well as a display apparatus, the test method of the tester includes the following steps: first of all, tiling the fabrics on a flattening table-board; then, placing the digital fabrics density detector on fabrics, switching-on a lighting lamp in the optical system towards the fabrics; regulating brightness of lighting lamp and display screen till the fabrics image is clear; then, putting the edge line of the straight ruler parallel to the non-testing system yarns, selecting a scale line of a straight ruler in alignment with the reticle in the middle of the display screen and uses the reticle as the initial point, rotating a transversal transmission mechanism and moving the optical system, counting the number of yarns within prescribed measurement distance; finally, fetching five test regions on the fabrics randomly, repeating the test steps, figuring out the mean value of thread count.

The present invention discloses a wireless communication method based on a common flue environment. When wireless communication is performed in a common flue environment, a wireless jump pass mode is employed between a host and slaves, and one slave is arranged at each floor; at a downlink communication link, message sent by any one slave x includes all the information sent by the host from a slave (x-1) to the slave 1; and at an uplink communication link, the message sent by any one slave x includes all the information sent to the host from the slave 1 to the salve (x-1). The wireless communication method based on the common flue environment allow the wireless signals to realize long-term transmission in a low emission power through a jump pass mode. The emission power of the wireless signals can accord with the requirements of the country for the radio emission power limitation.

The invention discloses an intelligent bus system device comprising at least two bus slot bodies and a monitoring device, wherein the two bus slot bodies are connected with each other form a whole body, the monitoring device is arranged at the connection part of the two bus slot bodies, jacks are uniformly formed in the connecting ends of cover plates of the bus slot bodies, and when the intelligent bus system device is installed, a temperature sensor of the monitoring device is inserted into the jacks so as to timely measure the temperature in the connecting part of bus slots, and the temperature of a conducting bar can be measured accurately. The intelligent bus system device overcomes the defect that data can be collected only when the temperature rises to a high value, improves the detection precision of the bus slots to be high, and can detect the temperature rising conditions of the bus slots uniformly and timely so as to improve the operation safety of the bus slots.

The invention discloses a method and a special device to detect electric signal of greenhouse plant. Its steps are: (1) Takes unpolarized electrode as reference and measuring electrode. (2) Connects electrode and plant stems or leaves without consuming by electrode linkage unit. (3) Adopts impedance transformer with its input impedance greater than 1012Omega to connect with output port of electrode separately. Signal output port of each impedance transformer is connected with a preamplifier, whose output signal is transferred to current signal by a voltage-current converter sending to signal processing unit for processing. The invention can long-term detect change of plant electric signal without consuming, process weak plant electric signal to separate signal and noise. When environment factor changes, it can calculate and detect main factor causing changes of plant electric signal by some arithmetic, which provides premise condition for plant electric signal detecting transferring from lab research to service and production.

The invention discloses a folding type tree diameter growth real-time precision measurement instrument. The device can accurately measure tree diameter in real time, the size of the device is small, the device can be folded, and the device is convenient to carry. The measurement device comprises a bracket, a gate ruler, a sensor fixture, a micron displacement sensor and a signal transmission processing circuit. According to the device, the mode of multi-point positioning and three-point measurement of diameter is used, two parts are assembled to form a V-shaped body with an included angel of 90 degrees to 150 degrees, and combined with the micron displacement sensor installed at the diagonal coincide part of a V-shaped angle, the measurement of the tree diameter is realized. The micron displacement sensor and the gate ruler carry out remote data transmission with a host machine through the signal transmission processing circuit. According to the folding type tree diameter growth real-time precision measurement instrument, the tree diameter and the micro change amount can be stably measured in real time at the same time, and a measurement error is reduced. The device can be folded and is convenient to carry, the device is convenient to use, the weight of the device is small, the size of the device is small, and the damage to a trunk by the fixture is small.

The invention discloses an information transceiving method in co-time co-frequency full duplex communication. In a vortex electromagnetic wave structure generating n (n>1) orbital angular momentum (OAM) modes, arbitrary k (0<k<n) modes of the n OAM modes are used for information sending and the remaining (n-k) OAM modes are used for information receiving by means of orthogonal property of the OAM modes, multiple signals which are independent to each other and do not interfere with each other can be simultaneously sent and received by the same frequency band in no need of extra self-interference elimination measure, high-rate and high-capacity co-time co-frequency full duplex communication is further achieved, the problems of existing wireless communication spectrum resource shortage, limited communication rate and the like are effectively solved, and a solution idea is provided for modern high-rate and high-capacity wireless communication.

The invention relates to the field of sonar detection, in particular to a sonar detection device and method for docking between an underwater robot and an underwater working platform. The sonar detection device comprises a guiding system, a receiving system and controlling systems. The guiding system is installed on the periphery of a docking group port of the underwater working platform. The receiving system is installed at the bottom end of the tail of the underwater robot and used for receiving a guiding signal sent by the guiding system. The controlling systems are all installed in a dry chamber of the underwater robot. The receiving system is connected with the controlling systems through cables. Each controlling system comprises a filter and amplifier circuit, a sampling circuit and a control module. The sonar detection device performs real-time detection on relative coordinates between the underwater robot and the underwater working platform and on the angle of the docking group port plane between the bottom surface of the underwater robot and the underwater working platform so as to control the sailing direction and tilted angle of the underwater robot. In this way, docking accuracy is improved by more than 50 percent.

The invention provides a data transmission system which comprises a ZigBee coordinator and multiple cascaded ZigBee routing modules, wherein the ZigBee routing modules are used for receiving data sent by ZigBee terminals connected with the corresponding ZigBee routing modules and independently sending the data of the ZigBee terminals or combining the received data of other ZigBee routing modules and then sending the combined data to a ZigBee network consisting of the ZigBee routing modules at the higher level; the ZigBee routing modules are connected with a GPRS (general packet radio service) wireless communication network, a 3G (third generation) wireless communication network, a 4G (fourth-generation) wireless communication network, a WiFi (wireless fidelity) network or a wired internet to realize remote data transmission. The ZigBee network construction in the data transmission system is low in complexity and low in cost, can be subjected to hybrid networking with the wireless communication network, the WiFi and the wired internet to realize remote, low-cost and wide large data transmission, is high in data transmission efficiency, and is high in stability and reliability.

The invention relates to a long-distance transfer system for video data, which comprises a transmitting terminal, an optical fiber and a receiving terminal, wherein the transmitting terminal is connected with the receiving terminal through the optical fiber; the transmitting terminal converts received video data into video optical fiber signals, transmits the video optical fiber signals to the receiving terminal through the optical fiber, simultaneously converts control optical signals transmitted from the receiving terminal into control signals and outputs the control signals to a camera control terminal; and the receiving terminal converts the video optical fiber signals transmitted through the optical fiber into video data and provides the video data to an external system, simultaneously receives the control signals input by the camera control terminal and converts the control signals into the control optical signals, and then transmits the control optical signals to the transmitting terminal through the optical fiber. The invention realizes non-loss real-time transmission of the video observation data of a telescope, has universality, and is especially suitable for the occasion of long-distance transmission of a Camera link video.

The invention relates to an FPGA (Field Programmable Gate Array)-based full-configuration type Camera link fiber-converting real-time image optical transceiver; the optical transceiver realizes a conversion function from the input of high-bandwidth (85MHz), high-reliability full-configuration type Camera link real-time images into the output of optical fiber real-time images, has a self-adaptive configuration function of inputting full, medium or basic type Camera link real-time images and a self-adaptive function of Camera link input working frequency; the conversion function from the input of the serial port and time sequence control optical fiber data steams to the output of the Camera link interface is realized and the reliability of the remote serial port communication and time sequence control of the Camera link real-time image optical transceiver is improved; the optical transceiver breaks through the technical difficulty of full-configuration type Camera link real-time image fiber conversion; the flexible configuration of the SFP (Small Form Factor Pluggable) fiber module is designed and realized, the transmission distance ranges from 500m to 120km, the anti-electromagnetic interference capability of the Camera link real-time image transmission system is strengthened and the requirements of various engineering application occasions are satisfied.

The invention relates to an optical sensing based impulse testing method and a device. The optical sensing based impulse testing method is characterized by comprising the following steps that: a guide rail is arranged along the tested impulse direction, a mass block capable of moving along the impulse direction is arranged on the guide rail, a linear raster is fixed at the side of the mass block,and a measurement device is arranged on the guide rail to measure a reflection light intensity-time curve of the linear raster, thereby impulse parameters are calculated. In the device, the pulse impulse parameters are measured by optical sensing, so that the anti-electromagnetic interference capability of a testing system is improved; the low-loss characteristics of optical fiber are utilized torealize the long-distance transmission of measurement signals so as to ensure the safety of a light source, an optoelectronic converter and other devices; the device can be applied to explosion and radiation field, and other special occasions, the testing range, resolution and the like can be changed by adjusting the weight of the mass block, the length of the linear raster, a line space and other parameters according to the tested object, and the method is adapted to the measurement requirements of different occasions and different parameters; and a testing probe has a small volume and a compact structure, and is convenient to install and disassemble.

The invention discloses a stone mine exploiting and cutting method, an exploiting method and a device thereof. The device includes a bracket, a bearing frame and a cutting unit; the bearing frame can be connected with the bracket in a sliding way; the cutting unit includes a main cutting arm and a cutting part; the first end part of the main cutting arm is connected with the bearing frame; the second end part of the cutting arm extends out of the bracket; the cutting part is connected with the second end part of the main cutting arm to lead the rotating axes of two disk saws to be arranged outside the bracket. As the distance between the two disk saws is not less than the distance between the left and the right of the main cutting arm, a cutter inlet space can be formed after removing a mine core between two cutting gaps for a cutter to enter the cutting part again; the axes of the disk saws can be lower than tracks and can be arranged in the mine; the cutting part even can be completely cut into the mine after the cutter enters the cutting part for a plurality of times. The device can carry out horizontal and vertical cutting of a plurality of angles, thereby being capable of realizing cave exploitation and preferably fetching stones and being capable of fully utilizing the texture structure of the stone to exploit.

The invention relates to an online monitoring system of partial discharge of a power cable. A monitoring node is mounted on a monitoring region of the power cable; the monitoring node is used for uploading partial discharge data to a central node through a direct sending or relaying transmission wireless communication manner; and the central node sends the received partial discharge data to a data managing platform so as to realize long-distance transmission of the partial discharge data. An underground monitoring node carries out information transferring through a wireless signal, and the data is directly sent to the data managing platform on the ground through the central node; any manual routing inspection is not needed, and a communication cable does not need to be paved, so that the collection of the partial discharge data of a plurality of monitoring nodes is more convenient and simpler, and the collection cost for collecting the partial discharge data is effectively reduced; and the online monitoring system has the advantages of high reliability and good instantaneity.

The invention relates to an expressway traffic information display method, device and system based on an intelligent lamp post. The method comprises the steps: collecting vehicle information, determining a road section for displaying expressway traffic information, interactively transmitting expressway traffic information, and tracking images of a vehicle and an adjacent vehicle; analyzing the visual field of a driver of the vehicle according to the tracked images of the vehicle and the adjacent vehicle, and displaying highway traffic information according to the visual field of the driver; evaluating the road condition in front of the vehicle; and displaying the highway traffic information according to whether the front road is abnormal or not. According to the invention, real-time traffic information guidance is provided for drivers for different vehicles through the intelligent lamp post; the intelligent lamp post cooperates with the guardrail screen and the ground sign display screen in the expressway section covered by the intelligent lamp post, so that traffic monitoring blind spots are perfected, drivers can obtain traffic information conveniently, the traffic accident rateis effectively reduced, and the traffic efficiency of the expressway is improved.