CN112543459A - Ad-hoc network system and method for large-scale cable-free seismograph - Google Patents
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Abstract
The invention discloses an ad hoc network system and an ad hoc network method of a large-scale cable-free seismograph, wherein the ad hoc network system comprises a main control server, a main central network bridge in wired communication connection with the main control server, and a plurality of regional central network bridges in wireless communication connection with the main central network bridge, the large-scale cable-free seismograph forms a wireless multi-hop network, the wireless multi-hop network is divided into a plurality of groups of sub-networks, and each group of sub-networks is in wireless communication connection with a corresponding regional central network bridge. The invention adopts a two-stage wireless transmission structure to meet the wireless ad hoc network requirement of a large-scale cable-free seismograph, so that the cable-free seismograph can really realize large-range real-time or quasi-real-time transmission of seismic data or quality monitoring data, and the seismic data or the quality monitoring data can meet or partially meet the standard requirement on data quality monitoring of oil-gas exploration and the like.
Description
Technical Field
The invention relates to the field of geophysical exploration, in particular to an ad hoc network system and an ad hoc network method of a large-scale cable-free seismograph.
Background
The most common instrument in the field of geophysical exploration is a seismometer, and the seismometer on the market still mainly takes the traditional cable seismometer, but in recent years, the seismometer without a cable node gradually starts to be widely applied. Such as the Smartsolo series of DTCC, canada, the Hawk series of middle eastern geophysical prospecting, the Zland series of Fairfield, for example. The cableless seismograph is favored by a plurality of customers with good construction efficiency, but the failure of realizing real-time quality monitoring becomes a main factor restricting the further development of the cableless seismograph. At present, the commercial cableless seismographs mainly rely on the Bluetooth technology to realize short-distance single communication, cannot form network unified management, and need an operator to approach to monitor the state of the seismographs.
A great deal of research is also carried out by scholars and manufacturers at home and abroad aiming at the problem. The data transmission scheme based on the Beidou communication satellite and the multi-hop network WIFI AD HOC link is provided in CN104793531A by the forest monarch and the like of the Jilin university, however, the scheme depends on the Beidou communication satellite, the total transmission rate of the large-scale wireless seismograph in the scene greatly exceeds the communication capacity provided by the satellite, the monitoring rate requirement is difficult to realize, the economic cost of communication with the satellite is very high, and the practical significance is not provided for the large-scale seismograph. An old and an et al of the university of gilin at CN102230972A propose a two-stage wireless transmission scheme, that is, a structure of a central master router and a regional slave router is adopted, and the slave router is responsible for aggregating data sent by an acquisition station in a region and then sending the data to the master router together. Multiple slave routers may implement the division of a large area into multiple smaller areas and then aggregate the transmissions. This solution uses a star connection in a small area, each acquisition station being connected directly to a slave router. However, the WIFI protocol has limited transmitting power, and the transmitting power of the acquisition station also cannot be too large due to the fact that the acquisition station is powered by a battery, so that the single-hop transmission distance of a common node is generally not more than 100 meters, the distance between seismic sensors in oil and gas exploration is 20 meters or more, and the number of the sensors which can be covered by each slave router in the structure is quite limited. And are not suitable for large-scale use. Also the solution proposed by rochonze et al at CN102307397A of the university of petroleum in southwest is a local solution based on a static link. The WTU-508 land node seismograph of the France Sercel company is used together with a cable seismograph and only realizes wireless transmission in a small range.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an ad hoc network system and an ad hoc network method of a large-scale cable-free seismograph, which do not depend on other external equipment and realize the ad hoc network capability of the large-scale cable-free seismograph in the field.
The technical scheme of the invention is as follows:
the self-networking system of the large-scale cableless seismograph comprises a main control server, a main central bridge in wired communication connection with the main control server, and a plurality of regional central bridges in wireless communication connection with the main central bridge, wherein the large-scale cableless seismograph forms a wireless multi-hop network which is divided into a plurality of groups of sub-networks, and each group of sub-networks is in wireless communication connection with a corresponding regional central bridge.
And the RJ45 Ethernet interface of the main center end bridge is connected to the main control server.
And the plurality of area center network bridges are in directional wireless communication connection with the main center network bridge through 5GHz WIFI antennas.
In each group of sub-networks, the cable-free seismograph with the best wireless communication quality with the corresponding regional central bridge serves as a root node, other cable-free seismographs serve as child nodes, and the child nodes are connected to the root node in a single-hop or multi-hop network wireless communication mode.
And 2.4GHz WIFI antennas are adopted for wireless communication connection among the plurality of cable-free seismographs in each sub-network and among the plurality of groups of sub-networks and the corresponding regional central bridge.
Each cableless seismograph comprises an STM32 main processor and WIFI SOC chips connected to the STM32 main processor, and the WIFI SOC chips of the multiple cableless seismographs in each sub-network are in wireless communication connection.
A self-networking method of a large-scale cable-free seismograph specifically comprises the following steps:
(1) and erecting a configuration network bridge: the RJ45 Ethernet interface of the main central bridge is connected to the main server, the management interface of the main central bridge is logged in the main server, the working mode is configured to be AP mode, the name and the password of the wireless network are set, then the management interface of the regional central bridge is logged in the same way after the regional central bridge is powered on, the management interface is set to be Client mode, the main central bridge which needs point-to-point connection is appointed and corresponding connection is carried out, thereby the coverage range of the remote AP is expanded to the range of the local bridge, and the root node of the sub-network is accessed to the main server through the regional central bridge;
(2) and selecting a root node by the wireless multi-hop network: firstly, WIFI SOC chips of all cable-free seismographs which are not connected into a network send WIFI beacon frames, the content of the WIFI beacon frames mainly comprises unique MAC addresses and RSSI values of area center bridges, all cable-free seismographs scan and receive WIFI beacon frames sent by other cable-free seismographs, after the monitoring is continued for a period of time, all cable-free seismographs select a plurality of corresponding root nodes according to the RSSI values relative to a plurality of area center bridges, namely the root nodes and the RSSI values of corresponding area center bridges are optimal, and then the root nodes and the corresponding area center bridges are in wireless communication connection;
(3) and generating a second layer node: after the root node is determined and accessed into the regional central bridge, the remaining child nodes within the range of the root node can start to be connected with the root node to form a first-layer intermediate layer, and the child nodes in the first-layer intermediate layer are first-layer father nodes;
(4) generating the remaining layers: the remaining child nodes are correspondingly connected with the parent nodes in the first-layer middle layer to form a new second-layer middle layer, the child nodes in the new second-layer middle layer are the parent nodes in the second layer, then the remaining child nodes are sequentially connected to form a plurality of middle layers, the child nodes in each middle layer are the parent nodes, and each parent node in the last middle layer is connected with a plurality of corresponding leaf nodes.
In the sub-network, when a plurality of choices exist for selecting the root node or the parent node at the previous layer, the root node or the parent node with the lower topological layer number and the lower number of connected child nodes is preferentially selected.
The total number of the layers of the multilayer middle layers and the leaf node layers is not more than the maximum number of the layers allowed in the sub-network.
The invention has the advantages that:
the invention adopts a two-stage wireless transmission structure to meet the wireless ad hoc network requirement of a large-scale cable-free seismograph, so that the cable-free seismograph can really realize large-range real-time or quasi-real-time transmission of seismic data or quality monitoring data, and the seismic data or the quality monitoring data can meet or partially meet the standard requirement on data quality monitoring of oil-gas exploration and the like. The invention overcomes the important defect that the current mainstream cable-free seismograph can not monitor data at all or can monitor data only in a small coverage range, and has important significance for further popularization of the cable-free seismograph and thorough replacement of the cable seismograph in the future. The invention adopts a mode of local multi-hop dynamic networking matched with integral directional wireless bridging to greatly expand the coverage area of a wireless local area network in the seismograph, and is a method which is really practical, effective and low in cost.
Drawings
Fig. 1 is a topology structural diagram of an ad hoc network system of the present invention.
Fig. 2 is a data transmission diagram of a wireless multi-hop network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the ad hoc network system of the large-scale cableless seismograph comprises a main control server 1, a main central bridge 2 in wired communication connection with the main control server 1, and a plurality of regional central bridges 3 in wireless communication connection with the main central bridge 2, wherein the large-scale cableless seismograph is divided into a plurality of groups according to distribution regions, the plurality of groups of cableless seismographs form a wireless multi-hop network, the wireless multi-hop network is divided into a plurality of groups of sub-networks 4, and each group of sub-networks 4 is in wireless communication connection with a corresponding regional central bridge 3.
The RJ45 Ethernet interface of the main center end network bridge 2 is connected to the main control server 1, and the main control server 1 can monitor the state of the seismometer in real time; the plurality of regional center bridges 3 are in directional wireless communication connection with the main center bridge 2 through 5GHz WIFI antennas, so that data gathering of all sub networks is achieved, the 5GHz frequency band is used for avoiding interference with a 2.4GHz frequency band adopted by a wireless multi-hop network, and therefore large batches of data are rapidly transmitted to the main center bridge 2, and due to the fact that large transmitting power is adopted to cooperate with directional transmitting antennas, the bridges can be far away from each other and maintain high-speed transmission; in each group of sub-networks 4, the cableless seismograph with the best wireless communication quality with the corresponding regional central bridge 3 is used as a root node 5, other cableless seismographs are used as sub-nodes 6, and the sub-nodes 6 are connected to the root node 5 by adopting single-hop or multi-hop network wireless communication; 2.4GHz WIFI antennas are adopted for wireless communication connection among a plurality of cable-free seismographs in each sub-network 4 and among a plurality of groups of sub-networks 4 and the corresponding regional central bridge 3; each cableless seismograph comprises an STM32 main processor (STM32F417 system) and a WIFI SOC chip (ESP 32-WROOM-32U series produced by Lexin company) connected to the STM32 main processor, the STM32 main processor and the WIFI SOC chip are connected through a UART interface, and the WIFI SOC chips of the plurality of cableless seismographs in each sub-network 4 are in wireless communication connection.
The STM32 main processor completes the management of all the peripheral equipment related to the cable-free seismograph, then communicates with the WIFI SOC chip on an application layer, and networking and routing related bottom layer protocols are all handed to the WIFI SOC chip to be realized. The WIFI SOC chip is responsible for realizing TCP, IP, a link layer, a physical layer protocol and a multi-hop network protocol of a standard Ethernet on a root node, and only the multi-hop network protocol and other bottom layer protocols need to be operated on a middle-layer father node and leaf nodes. The overall software protocol hierarchy and network data flow is shown in fig. 2.
A self-networking method of a large-scale cable-free seismograph specifically comprises the following steps:
(1) and erecting a configuration network bridge: taking a product B-DB-AC ball of UBNT company as an example, an RJ45 Ethernet interface of a main central bridge 2 is connected to a main server 1, a management interface of the main central bridge 2 is logged in the main server 1, the working mode of the management interface is configured to be an AP mode, a wireless network name and a password are set, then an area central bridge 3 is powered on, the management interface is logged in, the management interface is set to be a Client mode, the main central bridge 2 which needs point-to-point connection is designated and corresponding connection is carried out, so that the coverage range of a remote AP is expanded to the range of a local bridge, and a root node of a sub-network 4 is accessed to the main server 1 through the area central bridge 3; the method is characterized in that a network bridge is erected between two places, the distance is 1.5 kilometers, the distance between the network bridge and the ground is about 2 meters, and the average transmission rate of 10Mbps is obtained through actual measurement under the condition that the terrain has fluctuation;
(2) and selecting a root node by the wireless multi-hop network: firstly, WIFI SOC chips of all cable-free seismographs which are not connected into a network send WIFI beacon frames, the content of the WIFI beacon frames mainly comprises unique MAC addresses and RSSI values of area center bridges, all cable-free seismographs scan and receive WIFI beacon frames sent by other cable-free seismographs, after the monitoring is continued for a period of time, all cable-free seismographs select a plurality of corresponding root nodes 5 according to the RSSI values relative to a plurality of area center bridges, namely the RSSI values of the root nodes 5 and one corresponding area center bridge 3 are optimal, and then the root nodes 5 and the corresponding area center bridges 3 are in wireless communication connection;
(3) and generating a second layer node: after the root node 5 determines and accesses the regional central bridge, the remaining child nodes within the range of the root node 5 start to be connected with the root node to form a first-layer middle layer, and the child node 6 in the first-layer middle layer is a first-layer father node;
(4) generating the remaining layers: the remaining child nodes 6 are correspondingly connected with the parent nodes in the first-layer middle layer to form a new second-layer middle layer, the child nodes in the new second-layer middle layer are the parent nodes in the second layer, then the remaining child nodes 6 are sequentially connected to form a plurality of middle layers, the child nodes 6 in each middle layer are the parent nodes, and each parent node in the last middle layer is connected with a plurality of corresponding leaf nodes.
In the sub-network 4, when there are a plurality of choices for selecting the root node 5 or the parent node of the previous layer, the root node or the parent node with the lower topology layer number and the smaller number of connected child nodes is preferentially selected.
Wherein the total number of layers of the multi-layer intermediate layer plus one layer of the leaf node is not greater than the maximum number of layers allowed in the subnetwork 4.
The invention is different from the conventional networking mode in that the network is dynamically constructed and updated, which has very important significance in the field actual arrangement of the seismographs, because if the seismographs are in a static topological structure, all the seismographs must be arranged at certain positions according to the self numbers, and if the seismographs are arranged in the field, hundreds of the seismographs need to consume great manpower. After the dynamic wireless multi-hop network is introduced, all seismographs can be randomly arranged at measuring point positions without distinction, on the other hand, the wireless multi-hop network is better in stability, one node is powered off or disconnected, and other child nodes can reselect a parent node or a root node after a period of time, so that the network is repaired.
In the sub-network 4, when there are a plurality of choices when a parent node is selected, a node with a lower topology layer number and a node with fewer leaf nodes are preferentially selected as the parent node.
Examples
The 20 wireless seismographs are adopted for linear arrangement, and only one node is allowed in each layer, so that a 20-hop sub-network is formed, and the distance between every two wireless seismographs is 20 meters. At the moment, the network performance has obvious fluctuation, the situation that data are not uploaded for a short time can occur in the following nodes, but the overall network performance is normal, the situation that each wireless seismometer continuously transmits 1MB of data at the same time is actually measured, and the average speed of each wireless seismometer reaches the level of 10 KB/s. This rate may meet the data transmission requirements of the seismograph. And the extreme linear arrangement can not occur when the seismograph is actually laid in a three-dimensional and large-scale manner in the field, but the arrangement is similar to a rectangular arrangement, so that the hop count in a small range can be far lower than 20 hops during actual networking, generally limited within 6 hops, and finally the network stability and the throughput rate are also superior to those of the embodiment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The self-networking system of the large-scale cableless seismograph is characterized in that: the large-scale cable-free seismograph wireless multi-hop network comprises a main control server, a main central bridge in wired communication connection with the main control server, and a plurality of area central bridges in wireless communication connection with the main central bridge, wherein the large-scale cable-free seismograph forms a wireless multi-hop network, the wireless multi-hop network is divided into a plurality of groups of sub-networks, and each group of sub-networks is in wireless communication connection with a corresponding area central bridge.
2. The ad-hoc network system of the large-scale cable-free seismograph according to claim 1, wherein: and the RJ45 Ethernet interface of the main center end bridge is connected to the main control server.
3. The ad-hoc network system of the large-scale cable-free seismograph according to claim 1, wherein: and the plurality of area center network bridges are in directional wireless communication connection with the main center network bridge through 5GHz WIFI antennas.
4. The ad-hoc network system of the large-scale cable-free seismograph according to claim 1, wherein: in each group of sub-networks, the cable-free seismograph with the best wireless communication quality with the corresponding regional central bridge serves as a root node, other cable-free seismographs serve as child nodes, and the child nodes are connected to the root node in a single-hop or multi-hop network wireless communication mode.
5. The ad-hoc network system of the large-scale cable-free seismograph according to claim 4, wherein: and 2.4GHz WIFI antennas are adopted for wireless communication connection among the plurality of cable-free seismographs in each sub-network and among the plurality of groups of sub-networks and the corresponding regional central bridge.
6. The ad-hoc network system of the large-scale cable-free seismograph according to claim 4, wherein: each cableless seismograph comprises an STM32 main processor and WIFI SOC chips connected to the STM32 main processor, and the WIFI SOC chips of the multiple cableless seismographs in each sub-network are in wireless communication connection.
7. The ad-hoc networking method of the ad-hoc networking system of the large-scale cable-free seismograph according to claim 1, wherein: the method specifically comprises the following steps:
(1) and erecting a configuration network bridge: the RJ45 Ethernet interface of the main central bridge is connected to the main server, the management interface of the main central bridge is logged in the main server, the working mode is configured to be AP mode, the name and the password of the wireless network are set, then the management interface of the regional central bridge is logged in the same way after the regional central bridge is powered on, the management interface is set to be Client mode, the main central bridge which needs point-to-point connection is appointed and corresponding connection is carried out, thereby the coverage range of the remote AP is expanded to the range of the local bridge, and the root node of the sub-network is accessed to the main server through the regional central bridge;
(2) and selecting a root node by the wireless multi-hop network: firstly, WIFI SOC chips of all cable-free seismographs which are not connected into a network send WIFI beacon frames, the content of the WIFI beacon frames mainly comprises unique MAC addresses and RSSI values of area center bridges, all cable-free seismographs scan and receive WIFI beacon frames sent by other cable-free seismographs, after the monitoring is continued for a period of time, all cable-free seismographs select a plurality of corresponding root nodes according to the RSSI values relative to a plurality of area center bridges, namely the root nodes and the RSSI values of corresponding area center bridges are optimal, and then the root nodes and the corresponding area center bridges are in wireless communication connection;
(3) and generating a second layer node: after the root node is determined and accessed into the regional central bridge, the remaining child nodes within the range of the root node can start to be connected with the root node to form a first-layer intermediate layer, and the child nodes in the first-layer intermediate layer are first-layer father nodes;
(4) generating the remaining layers: the remaining child nodes are correspondingly connected with the parent nodes in the first-layer middle layer to form a new second-layer middle layer, the child nodes in the new second-layer middle layer are the parent nodes in the second layer, then the remaining child nodes are sequentially connected to form a plurality of middle layers, the child nodes in each middle layer are the parent nodes, and each parent node in the last middle layer is connected with a plurality of corresponding leaf nodes.
8. The ad-hoc networking method according to claim 7, wherein: in the sub-network, when a plurality of choices exist for selecting the root node or the parent node at the previous layer, the root node or the parent node with the lower topological layer number and the lower number of connected child nodes is preferentially selected.
9. The ad-hoc networking method according to claim 7, wherein: the total number of the layers of the multilayer middle layers and the leaf node layers is not more than the maximum number of the layers allowed in the sub-network.
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| CN114727432A (en) * | 2022-04-08 | 2022-07-08 | 中国人民解放军东部战区总医院 | Network communication system and method for plateau |
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