56 results about "Underwater network" patented technology

The invention relates to a method for a node to access multiple channels exactly and efficiently in an underwater cognitive network. The method comprises the steps of performing spectrum prediction by utilizing a spectrum sensing result and obtaining state information of each channel after the spectrum sensing; performing optimized allocation based on the current state information of each channel and each channel bandwidth as the optimization goal of spectrum allocation is the maximum channel gain, and the spectrum allocation emphasizes on considering maximization of a channel capacity; dividing multiple time slots in order to avoid long propagation delay of a sound signal and save energy, wherein each control packet and each data packet only can be sent at the start moment of one time slot; and transmitting data by adopting a message string mode, wherein each data transmitting node is required to transmit the data at the start moment of the time slot with the serial number being integer multiples of 4 after the channel allocation is ended. According to the method for the node to access multiple channels exactly and efficiently in the underwater cognitive network, effective throughput of an underwater network system is increased, and efficient transmission of communication data is realized.

The invention discloses a three-dimensional underwater network topology control method based on a potential game and a rigid subgraph. The method comprises the steps of 1, constructing an underwater wireless sensor network topology; 2, executing a network topology game; 3, removing redundant links; and 4, carrying out self-adaption and maintenance of the network topology. According to the method,underwater factors are fully considered, a UWSNs topology control method comprising a plurality of optimization targets such as connectivity, coverage, energy consumption, transmission delay, a data transmission success rate and a signal to interference plus noise ratio of a network is designed, the redundant links in network topology are eliminated by utilizing an optimal rigid subgraph principle, and the load of nodes is reduced; and meanwhile, the network can resist different underwater environments by adjusting a weight factor in the network, so that the method has relatively strong adaptability.

The invention relates to an organism-friendly directional underwater network routing method. The method comprises the steps of: establishing a 2D underwater sound sensor network, wherein all sensor nodes in the network can obtain geographical location information of self and neighbor nodes; in a process when a source node S forwards a data packet to a destination node D, if sensing a vector SD<-> passes through an organism-node interference area, requiring to adopt a bypass routing strategy; dividing the 2D underwater sound sensor network into L*L 2D grids, defining a coordinate of each of grid nodes in a 2D grid area, and after determining the organism-node interference area, finding out a coordinate range of the area in the grids; and when forwarding the data packet to a boundary point nearest to the interference area, adopting the bypass routing strategy. According to the organism-friendly directional underwater network routing method related by the invention, the energy consumption of the sensor nodes can be saved; and meanwhile, the harmonious coexistence between an organism and the sensor nodes is realized, and the communication efficiency and quality of the underwater sensor network are improved.

The invention provides an underwater remote control communication network. The underwater remote control communication network comprises an overwater network and an underwater network, a plurality of independent first ring nets are formed by each overwater controller and two overwater exchangers, a plurality of independent first ring nets are formed by each underwater controller and two underwater exchangers, second ring nets are formed by overwater and underwater exchangers and overwater and underwater optical transceivers, the whole network is in a multi-net crossed network structure which is formed by the second ring nets and the plurality of parallel first ring nets which are established on the second ring nets, all control devices and network links in the network are copied, the network redundancy degree and the fault tolerance are high, the first ring nets can be expanded on the second ring nets at will, the network expandability is high, the forming of a distributed control system with high reliability is facilitated, and the whole network is clear in structure, reasonable in design, low in costs and particularly suitable for signal transmission of an underwater remote control device.

The invention discloses an underwater wireless sensor network topology control method based on a genetic algorithm. The method comprises the following steps: a) constructing an underwater network model; b) establishing member node and cluster head node energy models and energy parameters; c) calculating the optimal cluster head number; d) determining an optimal cluster head by adopting a genetic algorithm, including the substeps: d-1) performing chromosome coding; d-2) selecting an initial population; d-3) constructing a fitness function; d-4) constructing a selection operator, a crossover operator and a mutation operator; d-5) calculating an individual fitness value; d-6) selecting an optimal cluster head; e) self-clustering and carrying out data communication. According to the underwaterwireless sensor network topology control method, the genetic algorithm is used in the cluster head selection stage, the multi-objective optimization problem can be solved, the energy and distance factors can be effectively balanced, the energy consumption of each node can be effectively balanced, and the overall energy consumption of the network is reduced, so the lifetime of the whole network isprolonged.

The invention relates to an energy-efficient and obstacle-avoiding underwater wireless sensor network routing method. According to the method, marine animals are prevented from serving as obstacles tointerfere underwater node communication. The residual energy of nodes is considered in a routing decision, data transmission between the two nodes is realized by utilizing multi-hop forwarding, the whole underwater network is divided into network blocks of 1000m * 1000m * 1000m, each network block comprises a sensor node, and a plurality of marine animals are regarded as an obstacle. The sensor nodes requiring mutual communication can sense, receive and forward data packets, and have consistent transmission range and energy consumption. Further, if the sensor node is not operating, the sensornode is in a sleep state.

An underwater wireless network can include plurality of nodes, each node having a cylindrical housing, a repeater, a transducer and a buoy. The housing defines a void and encloses the repeater. The transducer can be tethered to the housing and a buoy can be tethered to said transducer. Each node also includes at least two hemi-cylindrical flukes that can be pivotably attached to the housing. The housing can further be formed with at least two flood ports, and corresponding plugs are inserted into a respective fill port. Lanyards interconnect each flukes with a respective plug. During transport, the flukes can surround the transducer and the void is empty, which renders the node neutrally buoyant for ease of transport. For deployment, the flukes are pivoted away from each other to tighten the lanyards, which pull the plugs out of the flood ports, to further flood the void and deploy the node.

The invention provides a time-reversal multiple access method applicable to an underwater acoustic network and relates to the underwater acoustic communication and underwater network technology field. According to the method, a multiple access mechanism is appointed for an active time-reversal underwater acoustic network, conflicts and bump can be completely avoided when channel correlation is broken, success transmission probability is improved, through active TR space time focusing, spatial variation characteristics of an underwater acoustic channel is utilized to weaken broadcast characteristics of the underwater acoustic channel, not only can the crucial effect of effectively isolating signal interference among adjacent links under the distributed multi-hop environment be realized, but also excellent transmission concealment and confidentiality of the multiple access method is realized through weakening the broadcast characteristics of the underwater acoustic channel, on the condition that underwater acoustic correlation is not determined, spatial reuse and network throughput can be further improved even when channel weak correlation is broken, system time delay is reduced, and energy is saved.

The invention provides a target detection system, and the system is used for carrying out omnibearing detection on a monitoring target and improving the accuracy of target identification. The system comprises an air network node, an underwater network node and an air-sea cross-domain communication gateway, wherein the air-sea cross-domain communication gateway carries a heterogeneous signal processor, the heterogeneous signal processor comprises a plurality of processing units for processing different types of information, and the air network node is used for collecting air feature informationof a detection target and sending the air feature information to the air-sea cross-domain communication gateway; the underwater network node is used for collecting underwater characteristic information of the detection target and sending the underwater characteristic information to the air-sea cross-domain communication gateway; the heterogeneous signal processor is used for selecting a corresponding processing unit for processing to obtain target detection information according to the received air feature information and/or underwater feature information, and sending the target detection information to a shore-based data center.

The invention discloses a multi-AUV cooperative data collection method based on region division in an underwater acoustic sensor network. The multi-AUV cooperative data collection method comprises thefollowing steps: (1) carrying out node state perception and region division of an underwater network; (2) predicting the state of multiple AUVs; (3) planning and updating a data collection path of the AUV; and (4) scheduling type data forwarding. According to the invention, on the basis of network region division; an effective data collection method is executed by utilizing the spatial distribution characteristics and rapid and flexible energy points of multiple AUVs, and the multi-AUV cooperative collection can effectively improve the underwater data collection efficiency, balance the energyconsumption of the network, reduce the data collection delay and prolong the service life of the network while meeting the current service requirements.

The invention discloses a submarine junction box long-distance communication system structure, comprising a shore base station, a junction box system and a packet transmission switch system, wherein the junction box system comprises multiple junction boxes cascaded with each other, the packet transmission switch system comprises multiple packet transmission switches cascaded with each other, the shore base station is connected with the junction boxes through photoelectric composite cables, each junction box performs long-distance communication with each other through the packet transmission switches, and the shore base station supplies power to underwater networks and performs communication with underwater junction box equipment. According to the scheme of the invention, a multi-node cascaded ultra-long-distance marine environment monitoring system is established through the packet transmission switches (PTN), the long-distance optical transmission can be ensured, and in terms of network performance, no packet loss occurs,the delay is only tens of milliseconds, and high reliability can be achieved.

The invention provides an underwater communication positioning identification integrated waveform optimization method. In order to meet the demand of improving the underwater network situation perception and situation information interaction capability, through analyzing relations between underwater acoustic communication signal waveform parameter and underwater acoustic positioning range fining precision and a network inside member identification probability, the underwater communication positioning identification integrated waveform optimization method and a criterion are brought forward, constraint relations of underwater acoustic communication signal parameters for positioning and identification performance are given, and underwater integrated waveforms are realized through an optimization design method. According to the invention, a conventional communication waveform function can be effectively expanded, the effects of distance-distance positioning and network inside member identification functions are realized while data transmission is realized, an important base is provided for improvement of an underwater multimode network cooperation capability, and technical support is provided for development of an underwater network information system.

The invention discloses a safe and credible networking system for deep sea observation. The system comprises a credible land base local area network and a credible underwater local area network, the credible underwater local area network comprises a credible sensing terminal, a credible networking docking device, a credible access authentication device and a certificate service infrastructure, the credible land base local area network comprises a land base operation guarantee system, a credible access authentication device and a certificate service infrastructure, the credible sensing terminal is connected with the credible networking docking device, and the credible networking docking device is connected with the credible access authentication device through credible networks separately, and the certificate service infrastructure provides authentication support for the credible access authentication device. The invention provides an underwater credible local area network, and an underwater network related security protection system structure is established for providing security protection measures for the underwater local area network and completely solving the main security threats of the underwater network.

The invention belongs to the technical field of networks, and particularly relates to an underwater network-oriented network element optimization layout method, which comprises the following steps of:inputting an underwater environment three-dimensional diagram and underwater salinity Y; randomly generating an initial network element number N, carrying out binary coding on the initial network element number N, and setting an iteration frequency and a temperature threshold; calling a quantum genetic algorithm to calculate an optimal layout scheme of the N network elements and a coverage rate PC thereof according to the underwater environment three-dimensional diagram; calculating a fitness function f (N, PC, Y) by taking the number of the N network elements and the network element coveragerate PC of the corresponding optimal layout scheme as parameters; according to the method, a simulated annealing algorithm and a quantum genetic algorithm are combined, and the number of required network elements is optimized while the network element coverage rate in an underwater environment is ensured.

The present invention belongs to the field of marine environment monitoring, and particularly relates to a large-scale underwater network positioning method based on recursion position estimation. The large-scale underwater network positioning method comprises: 1, determining the initial value of a common node to be positioned; 2, constructing an observation equation, the distance measurement error equation of the common node, and the coordinate error equation of a reference node; 3, calculating a weight matrix according to the positioning error and the distance measurement error of the reference node, adding the weight matrix to an adjustment solution model, and calculating to obtain a position evaluation value of the common node to be positioned; and 4, performing the step 2 again by using the calculated position evaluation value as the initial value of the calculation, terminating the calculation until the difference between the two position evaluation values is less than a threshold, using the result as the position evaluation value of the common node to be positioned, and the like. According to the present invention, by using the common node selection criterion based on the error propagation theory, the average positioning precision of the network is effectively improved, the high network coverage at the large scale and high node density is provided, and the good applicability is provided.

The invention discloses a node service flow-considering underwater acoustic channel network media access control method which comprises the following steps: preventing data packet collision through carrier sensing and punctual time slot sending; in each data sending process, selecting a node with the longest sending queue through interaction of RTS/CTS packets; and finally obtaining a data sending opportunity by the sending node with the longest sending queue, and delaying the data sending by all the neighbor sending nodes of the sending node until the data sending of the sending node is finished. Looking from a long process, the nodes with larger service flow requirement can obtain larger transmission bandwidth. Therefore, the node service flow-considering underwater acoustic channel network media access control method is capable of realizing more optimized network bandwidth distribution, so as to effectively improve the practical throughput of underwater network, reduce the network packet delay and improve the network energy efficiency.

An underwater acoustic communication network protocol stack is designed and realized according to characteristics of an underwater network environment, and a distributed multi-hop peer-to-peer topological structure is adopted as a deployment mode of underwater nodes for a set of communication rules among all devices in an underwater acoustic communication network; aiming at the problems of long delay and easy interruption of underwater acoustic communication, the invention provides an underwater acoustic communication network protocol stack with break-tolerant and delay-tolerant capabilities, so as to ensure as low energy consumption as possible and higher network throughput rate under network delay; the coverage layer adopts a storage-carrying-forwarding working mode, proposes a divergence waiting protocol CDK-SQ based on contact probability according to the difference of historical contact information of underwater nodes in allusion to the problem of unstable underwater end-to-end link data transmission, proposes a CDK-SQ-TG routing protocol in combination with an active feedback mode and a deletion strategy in allusion to the problem of CDK-SQ network congestion, and carries out routing on the underwater end-to-end link. The feasibility and the performance effect of the CDK-SQ-TG are verified from the three aspects of delivery rate, average delay and overhead rate, and the method has huge practical significance and wide application prospects.

The invention discloses a multistage transmission strategy generation method based on an underwater wireless sensor network. The multistage transmission strategy generation method comprises the following steps: an underwater network gradient field is established through gradient packets generated by aggregation nodes on the water surface; the water surface aggregation node generates a gradient packet GEF (Nr) and transmits the gradient packet GEF (Nr) to the neighbor node; the underwater nodes calculate own gradients and corresponding node sets according to the received gradient packet information; iteration is sequentially carried out; and whether all underwater nodes obtain own gradients or not is judged; then, the aggregation nodes on the water surface generate a frequency band allocation packet ADV-B and send the packet to a neighbor node; the underwater nodes calculate and allocate own frequency band according to the frequency band allocation packet ADV-B; the underwater nodes generate and send a frequency band allocation packet to the neighbor node; iteration is sequentially carried out; and whether all underwater nodes complete frequency band allocation or not is judged. Data transmission paths can be distributed, and the network performance is improved while the requirement of marine application for data delay is met.

The invention discloses a lightweight underwater target detection method based on feature fusion and neural network search, and belongs to the field of computer vision. Land detection network features and underwater detection network features are fused, namely addition operation is carried out, so that the goal of guiding underwater network structure construction by using land priori knowledge is achieved. Meanwhile, a neural network search algorithm is utilized, an efficient search space is designed, a gradient-based microsearchable strategy is adopted, and an underwater super-network structure and a land mirror image detection structure are constructed to directly establish a relation among underwater decline quality factors, land prior information and a detection network structure.

The invention discloses a shortest path routing calculation method for an underwater wireless sensor network. The invention specifically relates to the technical field of wireless sensor networks. Themethod specifically comprises the following steps of: selecting a node closest to the node as a cache node, dividing the monitoring environment into a Voronoi diagram; wherein the cache node is usedas the center of each Voronoi unit; forwarding the data passing through a plurality of nodes in the Voronoi unit to the sink node through the cache node; wherein when the Voronoi unit is A, the central coordinate is (xe, ye); path length limiting formula for transmitting data to cache node through node in A is shown in the specification. According to the method, the underwater network time delay and the data packet loss rate are greatly reduced, the energy consumption is greatly reduced, the determination and selection of underwater routing nodes are realized, the shortest path suitable for the underwater wireless sensor network is obtained, and the life cycle of the whole wireless network is prolonged.

The invention discloses an underwater data transmission communication link selection method based on an auction game theory. Data auction is carried out on underwater network users having optical transmission underwater and being within the underwater acoustic transmission coverage area, so that the underwater network users winning the data auction carry out data transmission through wireless light transmission, and the underwater network users not winning the data auction carry out data transmission through acoustic transmission or wait for the next auction. According to the method, the usersoccupying optical channels underwater are reduced and the problems of descending of the transmission rate and large time delay, which are caused by channel congestion, are effectively solved.

The invention discloses an underwater network data transmission path determination method, a transmission method, a transmission device and equipment, and the method comprises the steps: determining an initial node and a destination node from network nodes, obtaining the first depth information of the initial node, obtaining an adjacent node of the initial node and the second depth information of the adjacent node, and obtaining the second depth information of the adjacent node; taking the adjacent node of which the second depth information is smaller than the first depth information as the first adjacent node, so that the transmission node determined based on the first adjacent node is located above the initial node, thereby being beneficial to improving the utilization rate of the underwater network and improving the efficiency and success rate of data transmission; the method comprises the following steps: acquiring an H index of a first neighbor node, determining the first neighbor node of which the H index meets a preset condition as a transmission node, determining a data transmission path according to the transmission node and a destination node, and selecting the transmission node and the data transmission path based on the H index, thereby being beneficial to improving the efficiency of determining the data transmission path. The method can be widely applied to the technical field of data transmission.

The invention provides an underwater network node deployment method. The method comprises the following steps: dividing an interface into logic regions of different levels; determining the position ofa candidate node in the logic area; adjusting the position density of the candidate nodes to obtain deployment nodes meeting a preset position density; and deploying the network node according to theposition of the deployment node. The method comprises the following steps: dividing a logic region for an interface by utilizing a geometric algorithm and determining position coordinates of candidate nodes; converting the key node deployment problem of the interface into an approximate problem equipment site selection problem FLP, and finally obtaining the deployment position of the candidate node. The invention further provides an underwater network node deployment system, a computer readable storage medium and a terminal, which have the above beneficial effects.