85results about How to "Strong invulnerability" patented technology

The invention discloses a method for implementing online tests of stream flow based on video images, and belongs to the technical field of non-contact open channel flow measurement. The method relates to a water flow tracing system, a water surface illuminating system, a video flow acquisition system, a camera calibrating system, an image processing system and a flow estimating system, trace particles are thrown in a flow measuring stream segment by the water flow tracing system, a camera shoots a water surface video stream, frames are extracted at fixed intervals and are processed digitally, the image processing system processes digital images according to ground control point coordinate information provided by the camera calibrating system, and finally, the stream flow is computed by the aid of the flow estimating system according to a flow rate and area method. By the aid of the method, complicity of stream flow measurement is reduced, simultaneously, high measurement precision can be guaranteed, and the stream flow can be dynamically monitored in extreme environments.

The present invention relates to a method for setting multilayer satellite network system route, including steps of: 1. setting parameters for the network initialization; 2. fixing a time, solving satellite orbit parameters in the interval of time, calculating the location coordinates of the satellite and the length of the link between stars, and establishing a network topological structure; 3. calculating the load of link between stars of the multi-layer satellite network; 4. calculating the process and exchange time delay on stars according to the queuing theory; 5. searching source satellite and object satellite of each satellite layer; 6. selecting the satellite layer for transporting services according to the communication service instruction requirement and network states, and searching an optimum route according to routing algorithm. Relative to traditional stationary orbit satellite, the present invention has small transmission delay, and high validity. The system has advantages of more flexible routing, effective guaranty of service quality, multiple replaceable chain circuits, stronger survivability, a capacity of processing and exchanging on star, optical or microwave links between stars, and capability of providing wideband synthetic service for users in global scope.

The method is implemented through mutual exchange and mutual control of timing reference between two neighboring nodes. For scheduling, several neighboring time frames composes super frame, and a time signal domain is added into each time frame. Each node in the time signal domain of a certain time frame periodically transmits time signal to indicate its timing reference. Meanwhile in each super frame , each node also needs to receive the time signal of other nodes from which the timing reference is extracted. Based on the timing references, the timing reference of local node is adjusted. Then the node sends the time signal based on the adjusted timing reference.

The invention discloses a load redistribution method for an electric power coupling network to resist cascade failure. The load redistribution method for the electric power coupling network to resist the cascade failure comprises the steps of abstracting and simplifying equipment in a communication network and a power network as a coupling network topology model; establishing a node capacity model according to the characteristics of the coupling network; establishing a load redistribution model according to a distribution method of loads after node failure; establishing a cascade failure model according to the characteristics of node failure of the coupling network; attacking communications network nodes, obtaining the maximum function set of power grid nodes after the coupling network is stabilized, and selecting the optimal load redistribution method. The method improves the capacity of the electric power coupling network for resisting the cascade failure, is beneficial to reducing maintenance cost, and improves the economic benefits and the social benefits of an electrical power system.

The invention discloses an SIP (Session Initiation Protocol)-based regional ground-to-air radio station voice networking system which comprises a plurality of ground-to-air radio stations and also comprises a tandem scheduling server, an SIP (Session Initiation Protocol) radio station voice communication terminal and a networking node network element device, wherein the networking node network element device is connected between the tandem scheduling server and the SIP (Session Initiation Protocol) radio station voice communication terminal and connected with the ground-to-air radio stations.The SIP (Session Initiation Protocol)-based regional ground-to-air radio station voice networking system can realizes integration with a ground-to-air data link system and can realize goal-oriented ground-to-air voice command which is compatible and coordinated with ground-to-air data link system; and a commander can synchronously obtain the voice command control capacity when seeing a target. Moreover, a communication link for directly implementing the voice command control on first-line task aircrafts is provided for a remote high-level command center within shorter setup time and in more flexible setup mode so that commands of chief executives can reach the first-line aircrafts immediately and the effect that a link can be uses as long as set up is achieved.

The invention discloses a precision drip irrigation measuring and controlling system based on a wireless sensor network. The system comprises a plurality of soil moisture statue monitoring nodes arranged within field monitoring ranges; each soil moisture statue monitoring node comprises a plurality of soil moisture content sensors buried in different underground depths and a soil moisture statue signal processing module; the soil moisture statue signal processing module is used for sending control information to next precision drip irrigation control nodes through a ZigBee wireless communication unit; and each precision drip irrigation control node comprises a ZigBee low-power-consumption and short-range wireless communication module, a singlechip and a control execution unit. By the system, three-dimensional monitoring on soil moisture content of underground plant roots in the different depths can be realized, and the measuring and the controlling on precision drip irrigation can be realized without the support of fixed networks. The system has the characteristics of rapid development, strong destruction resistance and the like, is convenient to install and maintain, and is particularly applicable to rural areas with poor signal converge. Moreover, the communication cost is lower when the system is used in a large scale.

The invention provides a wireless sensor component and a TDMA self-organized network implementation method based on the wireless sensor component, wherein each node of a network is provided with one wireless sensor component. The TDMA self-organized network implementation method comprises the following steps: step one, time slots of a TDMA self-organized network are determined, one time slot is set for each wireless sensor component, and each time slot comprises three beats; step two, a TDMA networking initiating node is determined; step three, time slot synchronization is conducted on the TDMA self-organized network. According to the wireless sensor component and the TDMA self-organized network implementation method based on the wireless sensor component, a mutual synchronization method is adopted, time slot synchronization starts from an initiating node of frame synchronization, frame initiating moments of all the nodes are aligned with the initiating node till the frame initiating moments of all reachable nodes in the network are aligned with an initiator, and therefore the aligning process is completed. Time slot synchronization of the organized network progresses at a high speed which can reach five microseconds; besides, the mutual synchronization method is adopted, so that clocks of all the nodes are controlled mutually, it is avoided that a certain node is depended on, invulnerability is high, and the wireless sensor component can adapt for dynamically-changing network topology.

An audio and data transmission node device of radio multi-jump network consists of ARM controller and its audio processing chip, network card interface, SD card interface and power supply. It is featured as not requiring fixed basic facilities to support and enabling to quickly self-organize radio network. The method utilizing said node device to set up self-organized radio network is also disclosed.

The invention discloses an agricultural irrigation monitoring system based on the Internet of Things. The agricultural irrigation monitoring system based on the Internet of Things comprises multiple soil moisture content monitoring nodes distributed within a field monitoring range. Each soil moisture content monitoring node comprises multiple soil moisture content sensors which are buried underground in different levels and a soil moisture content signal processing module. The soil moisture content signal processing module sends controlling information to subordinate fine drop irrigation controlling nodes of the soil moisture content signal processing module through the Internet of Things. Each fine drop irrigation controlling node comprises a ZigBee low-power short-journey wireless communication module, a singlechip and a controlling and performing unit. The system can perform solid monitoring on soil moisture content underground roots of plants in multiple depths and a fixed network is not needed in order to achieve monitoring of fine drop irrigation work. The agricultural irrigation monitoring system based on the Internet of Things has the advantages of being rapid in spreading, strong in survivability, low in communication cost when used massively, convenient to install and maintain, especially suitable for countryside areas where signal cover is poor and the like.

The invention discloses a large-scale civil defense alarm multilevel control system. The system comprises a control network, an alarm release network and a communication network, wherein the control network consists of a high-level control center, a middle-level control center, a last-level control center and a control subcenter which are connected with one another through the communication network; the alarm release network consists of a subordinate alarming terminal and a non-subordinate alarming terminal; the subordinate alarming terminal is connected with the last-level control center and the control subcenter through the communication network; the control centers at all levels inside the control network adopt wired communication as the primary communication mode and satellite communication as the subsidiary communication mode; the control network transmits an alarm release command to the alarm release network; and the alarm release network executes the alarm release command. The large-scale civil defense alarm multilevel control system integrates the advantages of various networks has reliable communication and strong survivability and can meet the requirements of alarming in a large scale.

The invention provides a distributed mobile mechanical arm task layered optimization control method based on generalized coordinates. A main task is that a plurality of mobile mechanical arms carry atarget object through cooperation of an end executor to enable the center of the target object to track a given reference trajectory, and a subtask is that joint angles and a mobile base formation arecontrolled to avoid obstacles through the sum of the maximum operability of all the mechanical arms; and by introducing the generalized coordinates, the tasks are divided into optimization layers andcontrol layers, reasonable allocation of redundancy in the control process is realized, and conflict with the main task is avoided while the subtask is completed. The fully-distributed control methodcan be used for realizing cooperative control over the multiple distributed mobile mechanical arms.

The invention discloses a centerless TDMA synchronization method suitable for wireless Ad hoc Network, belonging to the technical field of TDMA communication of the wireless Ad hoc Network. The method comprises the steps that a synchronization header is arranged on a distributed signal-sending time slot; a time frame counter is arranged on each node, and a time slot counter is arranged on each time frame of the different nodes; and after any node is started, information is intercepted, and the time frame counter is used for counting, wherein if the synchronization header of another node is received within one time frame, time of the node is synchronized with that of the corresponding node; if the synchronization headers of other nodes are not received, the time slot counter is used for counting; if the synchronization header is received before the next distributed signal-sending time slot, time of the node is synchronized with that of the corresponding node; and otherwise, the synchronization header of the node is sent out in the next distributed signal-sending time slot.

The invention discloses a method for adaptively controlling the frequency of a self-organizing frequency hopping network. The invention aims to provide a method with good survivability. The method isrealized through the following technical scheme: in the self-organizing frequency hopping network which is composed of a plurality of network nodes with equal status, each node comprises a frequency adaptive control function entity, a frequency hopping sending unit and a frequency hopping receiving unit for transmitting wireless signals through a wireless channel, and a frequency control unit forsending a frequency hopping sequence and a data message to the frequency hopping sending unit and the frequency hopping receiving unit; in the adaptive frequency control process, each node takes a neighbor signal-to-noise ratio and an interference condition sensed by the node as control parameters; and automatically selects the most appropriate frequency set from all frequencies in the working frequency band as a sending frequency hopping frequency set of the node, calculates a new sending frequency hopping frequency set, generates a frequency set notification message, automatically adjusts the sending times of the control message, and adaptively controls the frequency of the frequency hopping network.

The invention discloses a bidirectional amplifier of a TDD mode. The bidirectional amplifier comprises a switch circuit, an emission circuit, a transmit-receive isolation circuit, a receiving circuit and a transmit-receive control circuit. The transmit-receive isolation circuit comprises a double circulator. An output terminal of the emission circuit is connected to an input terminal of the double circulator. An input terminal of the receiving circuit is connected to a receiving terminal of the double circulator. An antenna terminal of the double circulator is connected to an antenna. The antenna terminal receives / sends an antenna signal. The transmit-receive control circuit is connected to the switch circuit, the emission circuit, the receiving circuit and the transmit-receive isolation circuit. The invention provides a receiving and emission high isolation circuit based on the TDD mode; and simultaneously a low noise receiving requirement and a linear large-power output requirement are satisfied, and stable and anti-interference work can be performed.

The invention relates to a semi-peer-to-peer acentric ad hoc network topology establishment method and apparatus for dividing a large number of nodes into two levels of multi-clusters. The ad hoc network topology establishment method comprises the following steps: dividing nodes into a plurality of node clusters, forming a plurality of second level ad hoc networks for the cluster nodes, selecting nodes in each node cluster to form a first level ad hoc network, and obtaining network topology composed of a plurality of ad hoc networks, wherein arbitrary two nodes in the network topology can perform communication. Compared with the problems of limited node number and poor expansibility of the ad hoc network topology in the prior art, the network topology in the embodiment of the invention increases the number of the nodes in the ad hoc networks, and the data transmission and processing among a large number of nodes can be supported. A data link network established based on the ad hoc network topology establishment method provided by the embodiment of the invention comprises a large number nodes, is flexible in architecture and high in expansibility, and thus being suitable for new generation of data link network structures in joint operation of multiple army categories.

The invention discloses a time division multiple access (TDMA) technology-based communication system for transmitting air situation and disaster situation early warning information. In the system, early warning information of various types of alarms such as air defense, disaster prevention and the like is transmitted by using the TDMA technology and a distributed network topological structure; meanwhile, message communication, data communication and acoustic code word communication are performed; and alarm information covers areas such as buildings, pits, tunnels, underground stores and the like by using various alarm information transmission technologies. The aims of quickly and reliably transmitting and returning various types of early warning information, reporting the various types ofalarm information and transmitting various types of service are fulfilled. The system has the function of quickly transmitting and distributing the various types of early warning information such as air defense, flood defense, shock resistance, fire prevention, flood discharge and the like, and can realize quick and accurate information transmission and all-around coverage of the alarm information, so that the alarms are reported without miss points or blind points, and real-time property, accuracy, high efficiency and all-around property of a civil air defense alarm are improved.

The invention discloses an air Ad hoc network topology awareness and maintenance method, and mainly solves the problems that the network robustness is poor, the network is likely to fall into disorder after a center control node is failed, and multiple center control nodes appear in segmentation and combination processes of topology, in an air Ad hoc network topology control method. The implementation process of the air Ad hoc network topology awareness and maintenance method is as follows: all nodes access the network to obtain position information of other nodes; after any node exits from the network, other nodes can delete the information of the exited node in time; when the network runs regularly, only one center control node exists, after the center control node exits from the network, one node which firstly detects the information about exit of the center control node starts to compete for the identity of new center control node, the node with smallest IP of all the nodes in the competition finally becomes the new center control node; in the process that the network topology is segmented or combined, each independent network maintains one center control node. The method improves a topology control function of an air Ad hoc network, and can be used for network topology awareness and maintenance of the air Ad hoc network.

The invention discloses a distributed ad hoc network architecture with a virtual center based on a dynamic topology of a mobile agent, and aims at the characteristics that the network size is large and the geographic distances of node distribution are far in a high-speed mobile environment, the communication link bandwidth is small, the node movement is fast, the damage is easily caused and the like, and interconnection of information between nodes of a wireless sensor network in a special extreme environment are guaranteed. On the basis of a distributed ad hoc network, the thought of an SDN (software defined network) is fused, and the distributed architecture containing the virtual center is constructed. Meanwhile, the distributed ad hoc network architecture aims at the characteristic ofhigh maneuverability of the wireless ad hoc network, adopts real-time topology sensing and control based on the mobile agent, and combines a plurality of terminals organically through a wireless ad hoc network technology. A rapid topology sensing and control algorithm of the mobile agent based on an ant colony algorithm and pheromone concentration is designed to be fully adapted to the wireless adhoc network in a high maneuvering environment.

The invention relates to a high-speed sampling wireless sensing network node, which comprises a high-speed collecting module and a wireless receiving / sending data processing module, wherein the first module comprises a high-speed analogue / digit converter, an on-site programmable gate array and a high-speed static memory; the second module comprises: a wireless sender / receiver, a central processor for timed processing operation request and communication protocol, a memory, I / O port, internal analogue / digit converter and system clock, which are connected by shared internal bus; the system clock supplies clock signal for the central processor and the wireless receiver / sender; the high-speed static memory is connected to two modules. The invention has lower weight, strong local processing ability, high sampling speed, small volume, and the application to form wireless sensing network.

The invention discloses a time-varying load redistribution method for the cascade failure of a logistics network based on a load capacity nonlinear model. The method comprises the steps of 1, establishing a logistics network topological structure model, and determining the initial load and the node capacity of each logistics network node; 2, selecting any node in that topology structure model of the logistics network to invalidate the any node; 3, aft any node fails, carry out load redistribution on that node after the cascade failure of the logistics network according to a load redistributionstrategy with time-varying consideration; Step 4, when the redistributed neighboring node reaches the failure condition, the step 3 is carried out again, the cascading failure redistribution strategyis carried out to redistribute until all the distributed nodes are no longer invalidated, and when the redistributed neighboring node reaches the effective condition, the cascading failure ends.

The invention discloses an internet of things based temperature and humidity monitoring system for a mine and an implementation method of the internet of things based temperature and humidity monitoring system for the mine. The system comprises a wireless sensing network and a monitoring device, wherein the wireless sensing network comprises a plurality of measuring nodes; the monitoring device comprises a base station node and a monitoring terminal device; each measuring node comprises a temperature sensor, a humidity sensor, a ZigBee protocol radio frequency transceiver and a microprocessor, wherein the temperature sensor, the humidity sensor and the ZigBee protocol radio frequency transceiver are respectively connected with a microprocessor; the temperature sensor and the humidity sensor transmit the detected temperature and humidity information to the microprocessor for processing, and the processed information can be transmitted to the base station node through the ZigBee protocol radio frequency transceiver; the base station node receives and stores the temperature and humidity information transmitted by the wireless sensing network, and transmits the information to the monitoring terminal device. The internet of things based temperature and humidity monitoring system disclosed by the invention has the advantages of small volume, low power consumption, quick networking, etc.

The invention discloses a method for realizing multi-band segmentation and aggregation of a spread spectrum signal. The method adopts a linear frequency modulation continuous wave (LFMCW) spread spectrum signal to carry out frequency spectrum segmentation and aggregation, multiplication processing in a time domain is only needed in a segmentation or aggregation stage, and the frequency spectrum segmentation of the LFMCW signal in the time domain comprises a method of multiplying a segmentation position of a time domain signal and the time domain by a filter and a method of carrying out re-aggregation on an LFMCW receiving signal. According to the method for frequency spectrum segmentation and aggregation of the spread spectrum signal, the fragment idle channel resources can be fully utilized; interference channels are avoided; the confidentiality of a transmission process is improved, and the signal is prevented from being intercepted in the air; and by adopting the method, a strong anti-interference characteristic, an anti-interception capability, a cognitive radio function suitable for an idle channel, and high interference resistance and high demodulation robustness under a condition of low modulation rate can be realized.

;The invention relates to the technical field of unmanned aerial vehicle cluster communication, in particular to an survivability unmanned aerial vehicle cluster topology optimization method based on positions and double key nodes, which optimizes cluster networking communication performance and aims at low power consumption, high robustness and strong survivability; the group topology is optimized by adopting a regional optimization and whole network comprehensive optimization mode, and meanwhile, on the basis of a conventional key node, the comprehensive performance of the whole network is improved by configuring an auxiliary key node and adopting a main and auxiliary backup mechanism; the unmanned aerial vehicle node obtains the group topology at the current moment and the next moment in real time by sensing and predicting the position tracks of other surrounding nodes, and the network survivability can be remarkably improved through double-key node configuration and an automatic switching algorithm, so that the whole network topology is more stable.

The invention discloses a mobile terminal-oriented blockchain platform and communication method. The method is applied to a communication end for data service extension and expansion. The communication end is characterized in that it comprises an ad hoc network module used for finishing interactive data transmission service to the communication end; a satellite communication module associated withthe ad hoc network and used for supporting common data service transmission by taking a satellite as a relay; and an LTE communication module used for receiving and processing data service transmission capability. A DAPP distributed decentralized application program is used as an interface of a face-to-face user; aiming at the characteristic that mobile terminal resources are limited, flow, performance and service optimization is carried out in the aspects of a P2P network communication module, a multi-chain structure, a secure storage area and an intelligent contract system, so that the blockchain platform oriented to the mobile terminal is high in communication capability, high in resource utilization rate, reliable in security and more perfect in robustness.

According to the same-time same-frequency full-duplex measurement and control communication networking method disclosed by the invention, the channel use efficiency, the networking access timeliness and the anti-interference capability can be improved. According to the technical scheme, a clustering structure is adopted for satellite node networking, a cluster head broadcasts cluster information through a downlink public spread spectrum channel, and all satellites in a cluster share an uplink public spread spectrum channel to bear network control information sent to the cluster head. Satellite compete to access an uplink common spread spectrum channel through a full duplex carrier sensing and conflict avoidance mode; Each satellite applies for a special spread spectrum channel from the cluster head for bearing the measurement and control communication service, and the service transmission between the satellites adopts a same-time same-frequency full duplex mode. A node X completes the network access process through the following steps: (1), cluster head information broadcasting; (2) network access request; (3) network access reply; (4) finding of the neighbor nodes; (5) hand shaking of the neighbor nodes; (6) network access confirmation; (7) updating of the whole network information.

The invention discloses an intelligent autonomous networking earthquake early warning device and method. The device is characterized in that an earthquake monitoring front end consists of a data collection module, an edge calculation module and a cooperative communication module, has the autonomous networking capability, and is used for achieving the intelligent strong earthquake recognition, early warning calculation and robust communication; the acquisition module comprises a GNSS module and an MEMS accelerometer; the calculation module employs an embedded microprocessor and is used for calculating an earthquake trigger confirmation signal and earthquake wave information in real time according to the multi-source monitoring data, and if the earthquake trigger confirmation signal is larger than a set threshold value, all earthquake monitoring front ends recognizing vibration in the ad-hoc network form a temporary monitoring network, and networking type strong earthquake mutual judgment and networking type earthquake early warning information calculation are formed; the communication module adopts a radio frequency chip supporting long-distance wireless transmission to establish anintelligent wireless communication ad hoc network and transmit and receive the seismic wave and early warning information obtained by the calculation module. The intelligent autonomous networking earthquake early warning device and method can be widely applied to earthquake early warning systems, and has the advantages of low cost, low power consumption, autonomy, intelligence, high timeliness, high reliability and the like.

The invention relates to an S-band autonomous switching bidirectional power amplifier and belongs to the technical field of circuits. A specific amplifier chip is adopted to realize S-band amplification, a special control method is adopted and an automatic monitoring circuit is adopted to perform real-time control on receiving and transmission, and therefore, the S-band bidirectional power amplifier which is simple in structure and capable of realizing autonomous switching can be realized. According to the S-band autonomous switching bidirectional power amplifier, for a transmission path, two power amplification chips are adopted to realize two-path combination, and consequently, the transmission power is increased and the transmission distance of signals is greatly increased; a low noise amplifier chip in which a amplitude limiter is arranged is adopted for a receiving path, and due to the characteristics of low noise, high gain and high destroy resistance of the low noise amplifier chip, the receiving sensitivity is remarkably improved and the receiving and transmission properties are balanced; complying with the design principles of balance and symmetry, consistent biasing circuit and filter circuit are adopted for the two-path power amplifier, the switching time is shortened and the receiving noise coefficient is reduced.

The invention discloses a distributed real-time deployment three-dimensional positioning method fusing an ultra wide band and a Beidou signal, and belongs to the technical field of indoor positioning,the positioning method comprises the following steps: S1, constructing a sensor network based on a Beidou module and an ultra wide band module, and calculating the barycentric coordinate of any nodeTh to be positioned in the sensor network; s2, solving a positioning result of any to-be-positioned node Th through parallel distributed calculation, and performing iterative convergence on the positioning result; s3, taking the positioning result as an initial value of Taylor expansion, and solving a final positioning result; and S4, converting the final positioning result under the relative coordinate system into an absolute coordinate system so as to achieve distributed positioning under the relative coordinate system by utilizing the ultra-wideband sensor network, and then converting the relative coordinate into an absolute coordinate through a Beidou module on the anchor point so as to achieve positioning of the sensor network under a geodetic coordinate system, thereby achieving positioning of the sensor network under the geodetic coordinate system. Therefore, the purpose of indoor and outdoor integrated positioning is achieved.

The invention discloses a wireless self-organizing communication system, which consists of at least two communication terminals, wherein every adjacent communication terminals are connected with each other through a wireless network; the communication terminals comprise any one or a combination of a handheld voice terminal, a handheld data terminal and a vehicle-mounted terminal; the communication terminals can be taken as hosts as well routers; and the communication terminals are used for hosting received information, and grouping and forwarding information which does not belongs to own groups. The wireless self-organizing communication system has very high destroy resistance, and is low in costs on establishment, extension, maintenance and application; moreover, the wireless self-organizing communication system has high environmental adaptability, can access to a relay for expanding a network coverage range, and can be communicated with the Extranet to obtain plenty of data services; and data transmission of the system has characteristics of high rate, large bandwidth, small time delay, wide network coverage range and the like.