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 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.

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 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 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 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.