1594 results about "Wireless sensor node" patented technology

The present invention relates to a sensor network having node architecture for performing trust management of neighboring sensor nodes, and to an adaptive method for performing trust management of neighboring sensor nodes for monitoring security in the sensor network. The sensor network includes a base station and a plurality of sensor nodes for reporting sensed information packets to the base station through radiofrequency signals relayed by other sensor nodes. A judge sensor node may have a trust estimator in its node architecture to evaluate trustworthiness of a neighboring suspect sensor node by determining a personal reference and receiving personal references from jury sensor nodes. Based on the trustworthiness of the suspect, the judge may modify a route for transmitting packets to the base station.

The wireless sensor network with energy efficient protocols includes a network of external sensors in communication with a data sink. The network utilizes an algorithm integrating a modified S-MAC (an algorithm for medium access control) protocol for decreasing energy usage in operating the node and associated sensors. A routing protocol is further integrated into the algorithm, the routing protocol being based upon cluster head rotation.

The invention discloses a data verification method based on block chains and a data verification system thereof. The data verification method comprises the steps that the sensing data of the environment and/or household equipment state are acquired through multiple wireless sensor nodes of a wireless sensor network and processed and then uploaded to a data repeater; the data repeater receives the processed sensing data and then forwards the sensing data to a data verification network; multiple data verification nodes in the data verification network are responsible for verifying and saving the sensing data; and all the data verification nodes are block chain nodes, and multiple data verification nodes form a distributed database. The data verification task is completed by using the data verification nodes, and the verification work is distributed to the verification nodes from the data repeater so that the problems of being low in verification efficiency, low in speed, high in transmission delay and vulnerable because of the excessively centralized verification task can be overcome, and the nodes are excited to actively authenticate the data and rapidly complete the verification task so that the whole verification system is not influenced by single node failure of any node.

The invention discloses a building fire intelligent rescue system based on a ubiquitous network. The system comprises a fire monitoring network, a handheld terminal, a monitoring center computer and a fire fighting command terminal, wherein the fire monitoring network consists of a plurality of convergence sub-networks and is connected with the monitoring center computer through wireless convergence nodes of the convergence sub-networks and a 3rd generation (3G) network; each convergence sub-network is a wireless sensor network which is provided with a main-chain-type topology structure consisting of wireless sensor nodes, namely fire monitoring nodes; and the handheld terminal comprises a query handheld terminal and a rescue handheld terminal, reads the label data of radio frequency identification (RFID) data of neighboring fire monitoring nodes of the handheld terminal by an internal RFID card reader and an RFID reading link which are arranged in the hand-held terminal, and exchanges data with the monitoring center computer through the 3G network. The system has the advantages of convenience in arrangement and high real-time capability; and the system can effectively assist firetrapped personnel in escaping and fire rescue personnel in making a rescue scheme; and intelligent guide is provided for the fire trapped personnel and the fire rescue personnel under the emergency condition of fire, and lives and property can be effectively rescued.

Disclosed is a telemetering system that comprises a wireless base station and a number of wireless sensor nodes. Each wireless sensor node includes a solar cell, a sensor for producing observation data indicating a quantity being measured, a wireless interface for receiving the observation data from the sensor when the node is activated, and a time-schedule memory for storing time-schedule data. Control circuitry briefly activates its own node by supplying power from the solar cell to the wireless interface at periodic intervals according to the time-schedule data of the memory and briefly establishes a wireless link to the base station. During the time the wireless link is briefly established, the control circuitry of each node transmits the observation data to the base station and updates its time-schedule memory if it receives time-schedule data from the base station.

Using six types of nodes of radio sensors to structure four types of radio sensor networks, the invention forms cooperation in four layers, and accomplishes four functions. The said cooperation is: cooperation between section of road and vehicles; road junction and road junction; road junction and subarea; subarea and subarea. The said four functions are: using radio sensor networks to collect data of traffic flow in real time, fast and accurately; based on need of real time traffic flow, the invention selects self-contained signal control algorithm or cooperated signal control algorithm dynamically to generate optimal scheme for allocating time of signal for road junction; communication between road junction and vehicles make possible to redistribute spatial traffic flow; remote control end can control schemes for allocating time forcibly. There is good compatibility between the invention and current hardware of signal control system.

The invention relates to a WSN mine safety monitoring system with a recombination function and a downhole accident monitoring method, belonging to a mining safety monitoring technology. The invention overcomes the problems of the previous wired monitoring system such as complicated wiring, failure to dynamically follow up an excavating surface, easy damage and the like. In the invention, a ground monitoring center of the monitoring system is an Ethernet system composed of a downhole monitoring access mainframe, a database server, a monitoring terminal and a remote terminal; a downhole wired sensor network is a CAN bus network composed of a plurality of wired sensors; the CAN bus network is connected with the downhole monitoring access mainframe; and a downhole wireless sensor network is composed of gateway nodes, a plurality of cluster-head nodes, a plurality of wireless sensor nodes and a plurality of movable nodes, wherein, the gateway nodes are connected with a CAN bus of the downhole wired sensor network. In addition, after a fault occurs, the gateway nodes and wired sensor nodes can form a higher-level wireless communication network so as to guarantee communication reliability. The invention is applicable to various mines.

The invention belongs to the technical field of street lamp illumination, and in particular mainly relates to a street lamp energy-saving and managing system based on internet of things. The system mainly consists of a main monitoring center, a remote terminal unit (RTU) and wireless sensor nodes, wherein the wireless sensor node which is responsible for detecting and controlling single lamp street to operate and executing a lamping switching-on and switching-off operation by receiving an instruction sent by the RTU is arranged on each street lamp, the wireless sensor nodes are connected with the RTU through a GPRS (General Packet Radio Service) module, and the RTU arranged at a transformer workstation is respectively connected with the main monitoring center, a server and a display device through Internet. The street lamp energy-saving and managing system disclosed by the invention can realize illumination as required, high efficiency and energy saving and fine management, solves the problems generally existing in the current street lamp monitoring management system and has the advantages of wide application range and suitability for popularization.

The invention discloses a wireless sensor network signal synchronous acquisition and on-time and real-time transmission method; wireless nodes in a wireless sensor network are divided into three kinds: a central node, a trunking node and a wireless sensor node, wherein, the central node is connected with a computer of a detection center for data transmission between the network and the computer; the trunking node and the central node are combined to a multi-hop chain type topological structure to realize a data long-distance transmission network; according to the information received from the trunking node, the wireless sensor node selects to join to a detecting unit controlled by a certain trunking node in order to send the own acquired data to the trunking node. In addition, the wireless sensor network adopts vibration signals to sample an initialization mode before the beginning and sample an on-time and real-time data transmission mode after the beginning. The wireless sensor network is characterized in low power consumption, large distribution range, timely and accurate detecting signal transmission, etc., and is suitable for wide popularization in the field of large-scale civil structure vibrating state detection.

The invention relates to a hybrid remote wireless sensor network system and a communication method thereof. The hybrid remote wireless sensor network system comprises a plurality of wireless terminals, more than one relay and a gateway. The wireless terminals are taken as end nodes of the network, are mobile nodes and are used for collecting user information, sending the information to the gateway and receiving the information from the gateway. The relays are taken as intermediate nodes for communication and are used for forwarding the information from the terminals and the gateway and providing a synchronous mechanism for communication in a coverage range of the relays and a data routing function. The gateway is taken as a sink node of the network and is used for receiving the information from the wireless terminals and the information forwarded by the relays, providing the synchronous mechanism for the wireless sensor network and is responsible for managing the wireless terminals in a management network. The wireless sensor network provided by the invention is established through adoption of a low-power-consumption remote wireless technology, such as a LoRa modulation technology and a Sigfox technology and has the advantages of low power consumption and long transmission distance.

The invention provides a method and a system for the fusion of multi-source monitoring data based on a heterogeneous clustering wireless sensor network. The system comprises a plurality of monitoring nodes, a plurality of cluster head nodes, a plurality of trunk nodes, a gateway node and an upper computer. The method comprises the following steps: after the gateway node switches on the upper computer, a PAN network in conformity with the ZigBee protocol is established; after the cluster head nodes and the trunk nodes are electrified, the cluster head nodes and the trunk nodes search for and join in the PAN network to form a wireless meshed network; the cluster head nodes receive broadcast packets of the monitoring nodes to carry out correlation calculation, and provide the calculation result to the upper computer through the wireless meshed network to carry out clustering processing; and then, the monitoring nodes in the cluster acquire environmental data according to the clustering result and send the data to the cluster head nodes in the cluster, and the cluster head nodes send the acquired environmental data to the upper computer through the wireless meshed network to be subjected to corresponding processing based on different sources of the environmental data. Thus, the heterogeneous clustering wireless sensor network and the wireless meshed network are combined, and the advantages of the both can be fully used for data acquisition.

A multi-path routing method is provided a multi-path routing method for selecting appropriate multiple paths when information sensed from a source node is transmitted to a sink node in wireless sensor networks. The source node for transmitting the sensed information first transmits a Hello message to the sink node to identify the existence and position of the sink node. The sink node receives the Hello message and then re-transmits the Hello message with respect to all the received Hello messages. Respective middle nodes accumulate distances between the middle nodes while the Hello message is transmitted to the source node through a reverse path of the Hello message, and all the middle nodes maintain a real distance from the sink node. The source node receiving all the Hello messages can rout a plurality of appropriate paths through Hop-by-hop to the sink node by providing respective weights to an energy remaining amount, an appropriate transmission radius and a real distance from the sink node. Accordingly, priorities can be provided to lifetime of the source node, average energy consumption and the shortest path by adjusting the respective weights when routing the plurality of paths. In addition, appropriate paths can be routed considering the transmission success rate of a path, and a load balancing effect can be obtained using path cost.

The invention provides a distributed control method for information of accessing an internet of things by a user, relating to the technical field of communication. The user applies to access a network resource to an access control server, the access control service issues an access certificate to the user and records relevant information of the user. The user forwards the access certificate to a wireless sensor node through a network management center of a wireless sensor network; and the user initiates an access request to the network management center, the network management center carries out access control on the user, the wireless sensor node carries out permission restriction on the user, and an access response message is sent to the user by adopting a safety manner. In addition, the user grants partial permissions or all permissions of the user for another legal user through permission authorization. The distributed control method disclosed by the invention can realize effective restriction and permission management of accessing the wireless sensor network by the user, and has the characteristics of low overhead of the node, and the like.

The invention discloses a formation system and a formation method of a multi-mobile robot based on a wireless sensor network, which belongs to the field of wireless sensor network and multi-robot control and solves the problem that the measuring range and the measuring accuracy are easily affected by environmental factors as multiple sensors are depended in the traditional multi-robot formation. In the formation system of the multi-mobile robot, the wireless sensor network is formed by gateway nodes, multiple beacon nodes, multiple master robot nodes and slave robot nodes, the communication between an upper computer monitoring system and the gateway nodes is realized through a serial communication port, the state monitoring for mobile nodes in the wireless sensor network is realized, and the beacon nodes which are used as fixed nodes are used for supplying position information support for the mobile nodes. In the formation method disclosed by the invention, target point position is sent to the master robot nodes through the gateway nodes by adopting an upper computer, the own positions of the master robot nodes and the slave robot nodes can be determined through the beacon nodes, and the master robot nodes drive all the slave robot nodes to carry out autonomous navigation towards the target point.

In the receiving side MAC layer timestamping approach, the MPDU structure is changed by adding an extra timestamping field. When a MPDU packet is generated, a captured receiving timestamp is written into the MPDU's timestamp field. The MPDU packet is then forwarded from the PHY to the MAC layer of the wireless sensor node. In the MAC layer, the receiving timestamp is further processed and inserted into a corresponding field of the time synchronization message, which is in turn transmitted to a Time Synchronization module. In the sending side MAC layer timestamping approach, the sending timestamp is captured immediately before the time synchronization message is written into TxFIFO.

The invention relates to the field of wireless self-organizing networks and sensor networks, in particular to an energy consumption control method under delay constraint in a wireless sensor network. The energy consumption control method comprises the following steps of: generating a normal data packet and a pioneer data packet by a source node when data packets in the wireless sensor network need to be transmitted to a base station from the source node, wherein the normal data packet is used for transmitting the data packets, and the pioneer data packet is used for selecting nodes on a transmission path; determining the delay constraint of the nodes on the transmission path; computing the best sleep time of the nodes on the transmission path; applying the best sleep time to a duty ratio self-adaptive adjustment mechanism to obtain new duty ratio to transmit the data packets; and respectively recovering work cycles of all the nodes on the transmission path into an original state after all the data packets are transmitted to the base station. According to the energy consumption control method under the delay constraint in the wireless sensor network, on the premise that the constraint condition of the wireless sensor network on transmission delay is met, the energy consumption of the wireless sensor network is reduced to the maximum limit, and the service life of the wireless sensor network is prolonged.

Provided are a flexible thermoelectric generator, a wireless sensor node including the same and a method of manufacturing the same. The flexible thermoelectric generator includes a plurality of P-type semiconductors and a plurality of N-type semiconductors, which are alternately arranged, an upper metal for connecting upper surfaces of the adjacent P-type semiconductor and N-type semiconductor, a lower metal for connecting lower surfaces of the adjacent P-type semiconductor and N-type semiconductor, and alternately disposed with respect to the upper metal, a P-type metal connected to at least one P-type semiconductor among the plurality of P-type semiconductors, and an N-type metal connected to at least one N-type semiconductor among the plurality of N-type semiconductors.

The invention relates to a congestion control method for a wireless sensor network, which comprises the following five steps: 1) at a source end of the sensor network, choosing representative nodes instead of all sensing nodes to report events; 2) detecting the congestion by the nodes according to an occupancy rate of a local buffer zone; 3) dividing the nodes between the source and a gathering node sink into far sink nodes and near sink nodes according to the distances from the nodes to the gathering node sink; 4) if detecting the congestion by the far sink nodes, sending a backward congestion report and spreading the report information along the direction of a data source, and adopting a congestion processing method based on flow scheduling by the node which receives the report information; and 5) if detecting the congestion by the near sink nodes, sending a forward congestion report to the gathering node sink, and adjusting the speed or quantity of the representative nodes by the gathering node sink according to an application requirement after receiving the congestion report information. According to the method, the congestion problems probably occurring in different areas of the wireless sensor network are solved by using different processing methods, thereby timely and efficiently avoiding or relieving congestion.

The invention discloses a wireless sensor network-based greenhouse group control system and a control method thereof. Each greenhouse is provided with a plurality of wireless sensor nodes and a cluster head node for acquiring environmental factors of the greenhouses according to needs, wherein the wireless sensor nodes and the cluster head nodes autonomously form wireless sensor networks by wireless communication; the wireless sensor nodes transmit monitoring data to the corresponding cluster head nodes in a multi-hop way; the cluster head nodes transmit the data to a gateway node which uploads the data to a communication server; the communication server performs two-way communication with a control computer; and the control computer makes corresponding guidance schemes according to the data monitored by the wireless sensor networks in real time, and synchronously transmits control instructions to the wireless sensor networks according to the guidance schemes. In the system and the method, the real-time data monitored by each sensor node in the greenhouses can be timely and accurately acquired, and the control instructions can be fast transmitted to the sensor nodes after specific production guidance is made or early-warning setting is performed according to the monitoring data.

The invention discloses an energy priority node clustering method for a wireless sensor network. The method comprises the following steps that: after network deployment is finished, a base station starts running all nodes in a network by transmitting a broadcast signal; each started node in the network computes own threshold value for becoming a cluster head; the nodes of which rest energy is more than or equal to the average energy of the network and which generate random numbers lower than the threshold values in the network are selected to be the cluster heads; the cluster heads broadcast own cluster head messages to the whole network, and each ordinary node computes own distances away from the cluster heads according to received signal strength after receiving the cluster head messages, and is added into the closest cluster as a cluster member; and the cluster heads allocate time division multiple access (TDMA) timeslots to each cluster member, so that each cluster member performs communication according to the allocated timeslots. By the method provided by the invention, the time to live of the network can be remarkably prolonged, and performance remarkably higher than that of a low energy adaptive clustering hierarchy (LEACH) protocol is ensured.

The invention provides a plant protection unmanned plane spraying operation method based on a wireless sensor network. A plurality of wireless sensor nodes are arranged in an operation region for collecting and feeding back spraying object concentration in real time, an unmanned plane is subjected to flight-path angle regulation according to the spraying object concentration, and if the spraying object concentration differential value is higher than the set threshold, the original flight-path angle is changed, so the unmanned plane flies in the direction with the low spraying object concentration to reach the goal of uniformly spraying in the operation region. The plant protection unmanned plane spraying operation method has the advantages that the autonomous operation capability of the unmanned plane in farmland operation environment is improved, the problem of nonuniform spraying caused by factors such as wind direction during the operation of the unmanned plane is solved, and the operation effect of the unmanned plane and the yield of crops are ensured.

The invention discloses a wireless sensor network system for monitoring real-time data of a power grid, which comprises a wireless sensor node, a gateway node, an Internet network and a monitoring center data platform, wherein the wireless sensor node is used for collecting real-time running state parameters of power grid equipment and transferring the collected parameters to the monitoring center data platform through the gateway node and the Internet network; the monitoring center data platform is used for monitoring the received real-time data of power grid equipment; and the wireless sensor node and the gateway node are connected to a power supply module. The timely induction for internal risks of the power grid equipment and the judgment on the equipment running state of a circuit are realized, by utilizing the wireless sensor network system provided by the invention in the manner of data monitoring. The gateway node of the wireless sensor network system has high transmission speed and strong anti-jamming capability; the wireless sensor node and the gateway node can be used for efficiently acquiring and storing energy; and the long service lives of the wireless sensor node and the gateway node are realized.

The invention relates to the technical field of storage logistics, and particularly discloses a monitoring system and a monitoring method for tobacco storage based on a wireless sensor network. The monitoring system for the tobacco storage based on the wireless sensor network comprises multiple varieties of wireless sensors which are arranged in each tobacco pile, a cluster point which is arranged corresponding to each tobacco pile, a central node which is respectively connected with the cluster points in a communication mode, a server and a management center, wherein the multiple varieties of wireless sensors at least comprise a temperature and humidity sensor and an oxygen content sensor, each cluster point is connected with the multiple varieties of wireless sensors in the tobacco pile corresponding to each cluster point in a communication mode, and the cluster points are connected with the management center in a communication mode. According to the monitoring system and the monitoring method for the tobacco storage based on the wireless sensor network, tobacco storage parameters are monitored based on the wireless sensor network, automatic remote monitoring and alarm can be achieved, quick on-line monitoring and wireless automatic reporting are achieved, abnormal situations of tobacco leaves are discovered in time, and therefore the dispose of the abnormal situations is conducted in time.