CN114339783B - Cable channel wireless ad hoc network device and configuration method - Google Patents
Cable channel wireless ad hoc network device and configuration method Download PDFInfo
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Abstract
The invention discloses a wireless ad hoc network device of a cable channel and a configuration method, comprising the following steps: a Mesh node; the system further comprises Mesh auxiliary nodes arranged at the bent positions of the cable channels, networking is matched between the Mesh auxiliary nodes and at least two Mesh nodes, and networking is matched between at least two Mesh auxiliary nodes arranged at the continuous bent positions; and the Mesh node receives the signal intensity of the Mesh auxiliary node to determine the distance between the Mesh node and the Mesh auxiliary node, and determines the configuration position of the Mesh auxiliary node according to the distance. Aiming at a wireless ad hoc network device of complex underground closed spaces such as curves and the like, a concept of a Mesh auxiliary node is provided, and the Mesh auxiliary node is utilized to improve the anti-interference capability of the wireless ad hoc network device; and the accurate configuration method of the Mesh auxiliary node is provided, so that the configuration accuracy is improved.
Description
Technical Field
The invention relates to the technical field of wireless ad hoc networks, in particular to a cable channel wireless ad hoc network device and a configuration method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the research on the theory of wireless communication in a channel mainly focuses on how to solve the multipath effect and how to solve the problem of electromagnetic wave signal attenuation at a curve. By researching the influence of the curvature radius in the bent roadway on the electromagnetic wave, the conclusion that the smaller the radius is, the more serious the attenuation is, the higher the frequency is, and the greater the attenuation rate is; and the software simulation calculation shows that the intensity of the received signal is greatly influenced by the position change of the transmitting antenna, and when the transmitting antenna is close to the roadway wall, the intensity of the received signal is slightly higher than that of the receiving antenna at the center of the roadway.
Because the electromagnetic wave can take place phenomena such as reflection, diffraction when passing through the bend structure, the direct wave can be directly sheltered from by the passageway wall, simultaneously except for reflection each time, more is from the ray that the four-wall reflection spiral progressed, and electromagnetic wave propagation ray is more complicated in the crooked passageway than sharp passageway, and the electromagnetic wave takes place more reflection, makes the electromagnetic wave propagate in the crooked passageway and attenuates than propagating in the straight passageway greatly, consequently causes the problem such as signal strength weakens, signal connection loses.
According to analysis, the problem of data transmission in a cable channel curve environment is solved, point-to-point remote communication cannot be realized, a dense networking mode is adopted, transmission nodes are increased, the transmission distance between two points is reduced, and communication transmission is carried out; however, the deployment and construction cost of the dense networking is extremely high, and the dense networking is not suitable for being applied to a cable channel environment.
Disclosure of Invention
In order to solve the problems, the invention provides a cable channel wireless ad hoc network device and a configuration method, and aims at the wireless ad hoc network device of complex underground closed spaces such as curves, and provides a concept of Mesh auxiliary nodes, wherein the Mesh auxiliary nodes are utilized to improve the anti-interference capability of the wireless ad hoc network device; and the accurate configuration method of the Mesh auxiliary node is provided, so that the configuration accuracy is improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a cable channel wireless ad hoc network device, including: a Mesh node; the system further comprises Mesh auxiliary nodes arranged at the bent positions of the cable channels, networking is matched between the Mesh auxiliary nodes and at least two Mesh nodes, and networking is matched between at least two Mesh auxiliary nodes arranged at the continuous bent positions; and the Mesh node receives the signal intensity of the Mesh auxiliary node to determine the distance between the Mesh node and the Mesh auxiliary node, and determines the configuration position of the Mesh auxiliary node according to the distance.
As an alternative implementation manner, the Mesh auxiliary node and the Mesh node are set to be in a periodic wake-up mode, and data acquisition is performed at fixed time intervals.
As an alternative implementation manner, mesh nodes within the coverage range of the wireless transmission power of the Mesh auxiliary node directly communicate, and all Mesh nodes are in an equal position.
In a second aspect, the present invention provides a method for configuring a wireless ad hoc network device using the cable channel, including:
according to the signal intensity of the Mesh auxiliary node received by the Mesh node, determining a Mesh master node and a Mesh slave node for ranging;
determining a mapping circle by taking the distance between a Mesh main node and a Mesh auxiliary node as a radius, wherein the Mesh auxiliary node is positioned on the mapping circle;
determining an optimal angle on a mapping circle according to the position coordinates of the Mesh master node and the Mesh slave node and the distance between the Mesh master node and the Mesh slave node and the Mesh auxiliary node;
and obtaining the configuration position coordinates of the Mesh auxiliary node according to the optimal angle.
As an alternative implementation manner, according to the Mesh master node and the Mesh slave node, a cable channel model is adopted, and a dynamic trilateration positioning algorithm is adopted to obtain the distances between the Mesh master node and the Mesh slave node and the Mesh auxiliary node.
As an alternative embodiment, the determining process of the distance from the Mesh auxiliary node includes:
wherein,,a is an actual position value, X σ Is a normal random variable of Gaussian distributionThe method comprises the steps of carrying out a first treatment on the surface of the p (a) represents the signal power of the Mesh node at the Mesh auxiliary node a received by the Mesh auxiliary node, p (a) 0 ) Representing the reference distance a 0 The received signal power at n represents the channel attenuation coefficient.
As an alternative implementation manner, according to the signal intensity of the Mesh auxiliary nodes received by the Mesh nodes, the signal intensity is ordered, the Mesh node with the strongest received signal intensity is selected as the Mesh master node, and the rest Mesh nodes are selected as the Mesh slave nodes.
Alternatively, the coordinates of the configuration position of the Mesh auxiliary node obtained from the optimal angle are (x 1 +d 1 cosθ,y 1 +d 1 sin θ), where x 1 、y 1 D is the coordinate of the Mesh master node 1 And θ is the optimal angle for the distance between the Mesh main node and the Mesh auxiliary node.
As an alternative embodiment, in the configuration method, further includes: according to probability distribution, screening the Mesh node with the strongest signal of the Mesh auxiliary node received at the edge of the wireless transmission power coverage area of the Mesh auxiliary node, thereby determining the initial position of the Mesh auxiliary node.
As an alternative embodiment, in the configuration method, further includes: after the configuration position coordinates of the Mesh auxiliary node are obtained, an average configuration error algorithm is adopted to evaluate the error of the configuration position of the Mesh auxiliary node.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a wireless ad hoc network device of a cable channel, which aims at the wireless ad hoc network device of complex underground closed spaces such as curves and the like, provides a concept of Mesh auxiliary nodes, and improves the anti-interference capability of the wireless ad hoc network device by utilizing the Mesh auxiliary nodes; meanwhile, the working modes of the Mesh auxiliary node and the Mesh node are set to be a periodic wake-up mode, so that the power consumption is greatly reduced; advanced wireless ad hoc network communication such as a low-power-consumption anti-interference data transmission technology, a communication ad hoc network technology and the like are researched, and different types of sensing data aggregation and access node standardization are realized by combining complex environments in a cable channel, so that a standard, rapid and reliable cable internet of things data wireless sensing network is formed.
The configuration method of the cable channel wireless ad hoc network device provides an accurate configuration mode of the Mesh auxiliary node aiming at complex underground closed spaces such as curves, has certain correction capability in the configuration position calculation method of the Mesh auxiliary node, reduces the influence of interference on configuration to a certain extent, and improves the accuracy of configuration.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic diagram of connection of Mesh auxiliary nodes at a curve in a wireless ad hoc network device according to embodiment 1 of the present invention;
FIG. 2 is a graph comparing the power consumption of the present invention provided in embodiment 1 with that of the prior art;
fig. 3 is a cable channel configuration diagram of a Mesh auxiliary node at a curve provided in embodiment 2 of the present invention;
fig. 4 is a schematic diagram of coordinate calculation of a Mesh auxiliary node according to embodiment 2 of the present invention;
wherein: 1. a master node; 2. a slave node; 3. a slave node; 4. mesh auxiliary node; 5. and a control center.
Detailed Description
The invention is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms also are intended to include the plural forms, and furthermore, it is to be understood that the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, processes, methods, systems, products or devices that comprise a series of steps or units, are not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or inherent to such processes, methods, products or devices.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment provides a cable channel wireless ad hoc network device, which comprises: the intelligent sensor terminal is connected with the Mesh node in a wireless manner, and the sensor is connected with the intelligent sensor terminal and used for detecting the state of the cable; the Mesh nodes are networked by adopting a network topology structure of self-adaptive networking;
as shown in fig. 1, the wireless ad hoc network device further includes a Mesh auxiliary node 4 disposed at a curve of the cable channel; matching networking between the Mesh auxiliary node 4 and at least two Mesh nodes; at least two Mesh auxiliary nodes 4 are arranged at the continuous curve, and the Mesh auxiliary nodes 4 are matched and networked; and determining the distance between the Mesh node and the Mesh auxiliary node by receiving the signal intensity of the Mesh auxiliary node by the Mesh node, and determining the configuration position of the Mesh auxiliary node according to the distance.
Preferably, the Mesh auxiliary node 4 communicates with the control center 5 on the ground in a wireless manner, and the signal strength of the Mesh auxiliary node 4 is fed back to the control center 5.
Preferably, the Mesh auxiliary node 4 is a Mesh base station with a protection level IP68 and a communication distance greater than or equal to 200 meters, and the Mesh nodes within the coverage range of the wireless transmitting power can directly communicate.
In this embodiment, all Mesh nodes in the wireless ad hoc network device are in an equal position, no central control node is needed to be specially arranged, the Mesh nodes have two functions of a host and a router, when the Mesh nodes are in a host state, tasks for providing needed services for users are executed, when the Mesh nodes are in a router state, corresponding routing protocols are executed, and packet forwarding is participated according to a routing strategy, and maintenance tasks are needed to be executed for the routes.
In this embodiment, the Mesh auxiliary node and the Mesh node are both set to a periodic wake-up mode, and data fed back by the intelligent sensor terminal are collected at regular time in a fixed period;
preferably, when not working, the Mesh auxiliary node and the Mesh node are in a standby mode, and each intelligent sensor terminal and each intelligent sensor are in a power-down state;
when the timing time is up, the Mesh auxiliary node and the Mesh node are automatically awakened, data are collected through the intelligent sensor terminal, the received data are stored in the storage unit to wait for transmission, and the collection is finished;
after the data acquisition is completed, the data is uploaded to the control center 5, and then the standby mode is entered.
In the embodiment, through the on-site control of the Mesh auxiliary node and the Mesh node, when data are not collected, the Mesh auxiliary node and the Mesh node stand by, so that the power consumption is reduced to the minimum; when the acquisition time in the period is reached, the Mesh auxiliary node and the Mesh node are automatically awakened, the power-on work is controlled on site, the background is uploaded after the acquisition is completed, then the power-off is controlled, and the energy consumption is reduced; as can be seen from the comparison of the power consumption shown in fig. 2, the power consumption of the device of the present embodiment is always lower than that of the prior art over time;
after the early warning signal is monitored, the monitoring density in the period is automatically improved; the untimely monitoring caused by periodic monitoring is avoided; after the early warning signal disappears, the density is monitored in an automatic recovery period, and electric energy is saved on the premise of not losing the monitoring effectiveness.
In this embodiment, when the Mesh auxiliary node 4 transmits in a curve or a continuous curve, it is affected by the attenuation of the interference signal, and its channel model is:
p(a)(dBm)＝10lgp(a) (1)
wherein: p (a) represents the signal power of the Mesh node at the Mesh auxiliary node a received by the Mesh auxiliary node, p (a) 0 ) Representing the reference distance a 0 The received signal power at and converting the received signal into decibel milliwatts (dBm) for representation;represents the average received power, delta represents the variance of the log-normal distribution, and n represents the channel attenuation coefficient.
The Mesh auxiliary node jointly considers the influence of environmental interference and channel fading, a reasonable Mesh auxiliary node path is established at a complex curve, and network interference is reduced; and determining a channel allocation sequence according to the interference power load factor of each Mesh auxiliary node as required, and then selecting a channel with the minimum interference and channel load for each Mesh auxiliary node so as to further reduce network interference and improve network performance.
In this embodiment, the Mesh auxiliary node includes the following modules:
and a data acquisition module: various types of sensors are generally used when acquiring system information in real time, wherein the monitoring types include switching value, state quantity and analog quantity;
and a data processing module: the voltage related data are acquired through a microprocessor, active power and reactive power are calculated, analog quantity processing is achieved, and instruction scheduling of switching on and switching off operation is completed;
and a data transmission module: a wireless communication unit including low power consumption and short distance;
and a power supply module: the power supply system comprises a battery power supply unit and a power grid power supply unit.
In this embodiment, the throughput generated by adopting different hop counts under the single-frequency and double-frequency networking conditions is compared, and in the single-chain condition, the throughput generated by adopting 3 hops 50m is 5 times of the throughput generated by adopting 3 hops 50m, so that the performance is obviously reduced, and when the Mesh networking is performed, 3 hops are selected for a single link generally, and the maximum is not more than 5 hops.
Example 2
In this embodiment, a method for configuring a cable channel wireless ad hoc network device according to embodiment 1 is provided, including the following steps:
s1: according to probability distribution, searching a Mesh node which can receive the strongest signal of the Mesh auxiliary node at the edge of the coverage area of the Mesh auxiliary node, thereby determining the approximate position of the Mesh auxiliary node;
s2: the Mesh node receives the signal intensity of the Mesh auxiliary node, three Mesh nodes receiving the strongest signals of the Mesh auxiliary node are selected, as shown in fig. 3, a dynamic trilateration configuration algorithm is adopted in combination with a channel model of a cable channel, the distance between the Mesh node and the Mesh auxiliary node is measured in real time, and according to the channel model of the Mesh auxiliary node, the deduced distance is as follows:
wherein:a is an actual position value, X σ Is a normal random variable of gaussian distribution, indicating that the configuration error increases with increasing measurement distance;
s3: among three Mesh nodes used for ranging configuration, the received signal strength is sequenced, the Mesh node with the strongest received signal strength is selected as a master node 1, and the other two Mesh nodes are selected as slave nodes 2 and 3;
as shown in fig. 4, a mapping circle is determined by taking a measured distance between a Mesh main node and a Mesh auxiliary node as a radius, and the Mesh auxiliary node 4 is on the mapping circle of the range of the main node 1;
obtaining the distance a between the Mesh auxiliary node and the Mesh node according to the signals received by the master node 1, the slave node 2 and the slave node 3 by the formula (4) 1 、a 2 And a 3 Searching an optimal angle theta on the mapping circle by utilizing a dynamic trilateration algorithm, and finally obtaining the position coordinates of the Mesh auxiliary node;
the step S3 specifically includes:
s31: selecting the Mesh node receiving the strongest signal as a master node a 1 (x 1 ,y 1 ) And determining a mapping circle; measuring distance d from Mesh auxiliary node 4 1 ；
S32: determining the position coordinates a of the slave node 2 and the slave node 3 2 (x 2 ,y 2 ) And a 3 (x 3 ,y 3 ) The distance d between the slave node 2 and the slave node 3 and the Mesh auxiliary node 4 is measured respectively 2 And d 3 ；
S33: according to the minimum value of the cost function, determining an optimal angle theta to obtain the configuration position coordinates of the Mesh auxiliary node 4: (x) 1 +d 1 cosθ,y 1 +d 1 sinθ)。
S4: an average configuration error algorithm is adopted to evaluate the error E of the configuration position of the Mesh auxiliary node 4:
wherein:is the configuration position value of the ith Mesh auxiliary node, a i Is the actual position value of the ith Mesh auxiliary node, and R is the coverage value of the Mesh auxiliary node.
The embodiment provides an accurate configuration mode of the Mesh auxiliary node aiming at complex underground closed spaces such as curves, has certain correction capability in the configuration position calculation method of the Mesh auxiliary node, reduces the influence of interference on configuration to a certain extent, improves the accuracy of configuration, and can be widely applied to wireless ad hoc network occasions.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. The configuration method of the wireless ad hoc network device by utilizing the cable channel comprises the following steps: a Mesh node; the method is characterized by further comprising Mesh auxiliary nodes arranged at the bent positions of the cable channels, networking is matched between the Mesh auxiliary nodes and at least two Mesh nodes, and networking is matched between at least two Mesh auxiliary nodes arranged at the continuous bent positions; the Mesh node receives the signal intensity of the Mesh auxiliary node to determine the distance between the Mesh node and the Mesh auxiliary node, and the configuration position of the Mesh auxiliary node is determined according to the distance;
according to the signal intensity of the Mesh auxiliary node received by the Mesh node, determining a Mesh master node and a Mesh slave node for ranging;
determining a mapping circle by taking the distance between a Mesh main node and a Mesh auxiliary node as a radius, wherein the Mesh auxiliary node is positioned on the mapping circle;
determining an optimal angle on a mapping circle according to the position coordinates of the Mesh master node and the Mesh slave node and the distance between the Mesh master node and the Mesh slave node and the Mesh auxiliary node;
the configuration position coordinates of the Mesh auxiliary node are obtained according to the optimal angle:
(x 1 +d 1 cosθ,y 1 +d 1 sinθ)
wherein x is 1 、y 1 D is the coordinate of the Mesh master node 1 And θ is the optimal angle for the distance between the Mesh main node and the Mesh auxiliary node.
2. The configuration method according to claim 1, wherein the Mesh auxiliary node and the Mesh node are set to a periodic wake-up mode, and data acquisition is performed periodically in a fixed period.
3. The configuration method of claim 1, wherein Mesh nodes within a wireless transmission power coverage area of the Mesh auxiliary node all communicate directly, and all Mesh nodes are in an equal position.
4. The configuration method according to claim 1, wherein distances between the Mesh master node and the Mesh slave node and the Mesh auxiliary node are obtained by adopting a cable channel model and a dynamic trilateration positioning algorithm according to the Mesh master node and the Mesh slave node.
5. The configuration method according to claim 4, wherein the determining of the distance from the Mesh auxiliary node includes:
wherein,,a is an actual position value, X σ Is a normal random variable of gaussian distribution; p (a) represents the signal power of the Mesh node at the Mesh auxiliary node a received by the Mesh auxiliary node, p (a) 0 ) Representing the reference distance a 0 The received signal power at n represents the channel attenuation coefficient.
6. The configuration method of claim 1, wherein the signal strengths are ordered according to the signal strengths of the Mesh auxiliary nodes received by the Mesh nodes, the Mesh node with the strongest received signal strength is selected as a Mesh master node, and the remaining Mesh nodes are selected as Mesh slave nodes.
7. The configuration method according to claim 1, characterized in that in the configuration method, further comprising: according to probability distribution, screening the Mesh node with the strongest signal of the Mesh auxiliary node received at the edge of the wireless transmission power coverage area of the Mesh auxiliary node, thereby determining the initial position of the Mesh auxiliary node.
8. The configuration method according to claim 1, characterized in that in the configuration method, further comprising: after the configuration position coordinates of the Mesh auxiliary node are obtained, an average configuration error algorithm is adopted to evaluate the error of the configuration position of the Mesh auxiliary node.
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| CN110493730A (en) * | 2019-08-21 | 2019-11-22 | 科航（苏州）信息科技有限公司 | Wireless self-networking communication node localization method and communication node |
| CN112235865A (en) * | 2020-11-05 | 2021-01-15 | 深圳华云时空技术有限公司 | Tunnel positioning anchor node network based on Mesh technology and deployment method |
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| KR100701351B1 (en) * | 2005-11-03 | 2007-03-29 | 임재성 | SELF LOCATION ESTIMATION SCHEME IN Wireless SENSOR NETWORK |
| CN101835259A (en) * | 2010-05-26 | 2010-09-15 | 哈尔滨工业大学 | Wireless sensor network node positioning method based on distance assistance |
| CN109041166A (en) * | 2017-06-12 | 2018-12-18 | 南京沃旭通讯科技有限公司 | A kind of method and system that the spatial relation of wireless netted network node is formed and updated |
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