CN107872278A - A kind of underwater visible light communication sensor network system of multidimensional based on ranging localization - Google Patents
A kind of underwater visible light communication sensor network system of multidimensional based on ranging localization Download PDFInfo
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- CN107872278A CN107872278A CN201710822213.6A CN201710822213A CN107872278A CN 107872278 A CN107872278 A CN 107872278A CN 201710822213 A CN201710822213 A CN 201710822213A CN 107872278 A CN107872278 A CN 107872278A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/16—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using electromagnetic waves other than radio waves
Abstract
The invention discloses a kind of underwater visible light communication sensor network system of multidimensional based on ranging localization.The system includes：Anchor node, network access module, network signal processing module, visible light communication transceiver machine A and B, electronic signal processing module, processing locality and display module, cloud server module and database.It is loaded into after network signal access through analog-to-digital conversion on blue-ray LED, by visible light channel to receiving terminal, then through optical-electrical converter is loaded into signal processing chip, network is sent in the same fashion after terminal recognition.Meanwhile the cloud server module bit error rate for analyzing processing locality and display module, submarine site information for being drawn through location algorithm etc. are uploaded to database in real time.The present invention causes relevant parameter change to realize sensing by channel variation.In addition, node forms multidimensional Sensor Network, reliable underwater data transmission can be achieved, and submarine site information is grasped by node, can be achieved to be accurately positioned, and robustness is preferable.
Description
Technical field
The invention belongs to the communications field, and in particular to a kind of underwater visible light communication Sensor Network of multidimensional based on location algorithm
Sensor Network.
Background technology
In recent years, the fast development of the communication technology, brought great convenience for our life.Visible light communication is base
In the safe and secret communication of a kind of new, short distance that light emitting diode etc. technically grows up, the wireless communication technology of high speed,
With good development prospect.Subsurface communication all has critical role in military, industry and scientific domain.Subsurface communication speed
Demand is in the range of several million to tens even more highs.Radio wave in the seawater can be by altitude decay.Sound wave is in ocean
Transmission speed is 1500m/s, and time delay length, Bandwidth-Constrained, the bit error rate is high, and sound wave also can be to marine animals such as dolphin and whales
Produce interference etc..VLC can overcome the problems such as decay and electromagnetic interference well under water, have very big advantage.
For present case, the correlative study of wireless light communication technology is carried out both at home and abroad.In November, 2015,
Velmenni companies of Estonia demonstrate Li-Fi prototype bulbs in Tallin, and its data transmission bauds is up to 1Gbps；Testing
Under specified conditions, the Li-Fi lamp data transmission speeds of record reach 224Gbps.In the Globecom meetings in December, 2016,
Ki-Hong Park etc. analyze the reliability of indoor visible light mimo system.2017, YahyaMohammed Al-Moliki
Seminar have studied the safety of physical layer strategy of indoor visible light communication.In 2 months the same years, Sun Hongwei etc., which is proposed, realizes intelligent hand
The scheme of machine visible ray positioning function.Meanwhile fourth elder brother of the Chinese Academy of Sciences etc. develops a portable light antenna equipment.But according to
Known to us, not yet occurs the research with multidimensional Sensor Network visible light communication system both at home and abroad.
Full-duplex communication is the up-link and downlink in communication equipment while carries out the transmission of data and instruction.Base
In VISIBLE LIGHT SYSTEM, with reference to multidimensional transmission and the full-duplex communication of location technology, higher positioning precision is can be achieved to, is carried simultaneously
High spectrum utilization.
The content of the invention
The present invention employs the underwater visible light communication Sensor Network of multidimensional based on location algorithm to improve the precision of positioning
Ranging localization.The thinking of the present invention is first had in the case where channel circumstance is good, and what structure can carry out data transmission can
See optical communication system；Then, when channel circumstance is by destroying, the break-make of network signal is observed, so as to realize sensing function.
To achieve the above object, the technical solution adopted by the present invention is a kind of underwater visible ray of multidimensional based on ranging localization
Communicate sensor network system, and the system includes anchor node, network access module, network signal processing module, visible light communication transmitting-receiving
All-in-one A and B, electronic signal processing module, processing locality and display module, cloud server module and database, network connect
Entering module and network signal is linked into the system, network signal processing module is handled network signal, forms data signal,
VISIBLE LIGHT EMISSION machine A carries out electro-optic conversion, converts digital signals into optical signal and is launched by light emitting diode, receiving terminal
B carries out optical-electrical converter and is loaded into electronic signal processing module again, and network is passed in the same way after terminal recognition, same with this
When, bit error rate that cloud server module analyzes processing locality and display module, the submarine site drawn through location algorithm
Information is uploaded to database in real time, and system causes relevant parameter change to realize sensing by channel variation.
Further, above-mentioned anchor node is one of node in monitoring waters, except anchor node also has beaconing nodes and unknown
Node.
Whole position fixing process is divided into two parts：Anchor node positions and unknown node positioning, defines the positioning week of each node
Phase is T1, and beaconing nodes are directly contacted by acoustic signals with anchor node, and anchor node collects at least three above beaconing nodes position
Information, the positional information of anchor node is calculated using trilateration.
Beaconing nodes need to dispose more than four and be equipped with GPS.
The basic step of the location algorithm of unknown node is as follows：
(1) define unknown node only to be contacted with its local hop neighbor node, disappeared by the local with anchor node
Breath is transmitted to be positioned oneself；
(2) unknown node and the minimum hop count of anchor node are calculated, anchor node obtains the position of oneself by beaconing nodes to be believed
After breath, its grouping information is broadcasted, hop count field is initialized as 0, and hop-by-hop adds 1, and in broadcasting process, anchor node will also be recorded and oneself arrived
The minimum hop count of other anchor nodes, unknown node recorded the minimum hop count of each anchor node, if receiving from same node
Identical data packet or the larger packet of hop count field, then give up；
(3) unknown node is calculated to the Average hop distance D of the distance of anchor node, first calculating anchor node, each anchor node
Obtained D broadcast packes are multiplied by unknown node j to anchor node i hop count to whole network, unknown node using obtained D
Nij is the distance Dij that can obtain unknown node j to anchor node i：
(i=1,2 ... n numbers for anchor node).
Compared with prior art, the present invention has following advantageous effects：
1, the present invention is positioned using multidimensional, i.e., by the position of multiple known anchor nodes, determines the position of unknown node, with
The increase of reference coordinates, the degree of accuracy is higher, and positioning is more accurate.
2, the present invention uses sensor node, and energy consumption is small.
Brief description of the drawings
Fig. 1 is the system schematic of the present invention.
Fig. 2 figures compared with the positioning performance of distributed algorithm for the present invention.
Fig. 3 is the distribution schematic diagram of three kinds of nodes.
Embodiment
The present invention is described in further details in conjunction with accompanying drawing.
Received as shown in figure 1, the system includes anchor node, network access module, network signal processing module, visible light communication
Send out all-in-one A and B, electronic signal processing module, processing locality and display module, cloud server module and database.Network
Network signal is linked into the system by AM access module, and network signal processing module is handled network signal, forms numeral letter
Number, it is seen that optical sender carries out electro-optic conversion, converts digital signals into optical signal and is launched by light emitting diode, receives
End carries out optical-electrical converter and is loaded into process chip again, and network is passed in the same way after terminal recognition.At the same time, cloud
Bit error rate that end server module analyzes processing locality and display module, the submarine site information drawn through location algorithm etc.
It is uploaded to database in real time.System causes relevant parameter change to realize sensing by channel variation.
Under the good free space environment of channel, channel gain h can be expressed as
Wherein, m is Lambertian radiation exponent number, and A is the area of receiving terminal photodiode (Photodiode, PD), and d is transmitting-receiving
The distance at end, a and b represent LED radiation angle and PD incidence angle respectively.
Visible light signal reaches visible Optical Receivers after visible light channel is transmitted.The visible Optical Receivers
Execution and the opposite operation of visible optical transmission module, namely opto-electronic conversion is carried out, light intensity signal is converted into electric signal.Receiver
The electric signal received can be expressed as
Y=rhx+z
Wherein, r represents photoelectric transformation efficiency, and x is the light intensity signal sent, and z is the additive Gaussian white noise for obeying N (O, σ 2)
Sound.Then, by amplifying, filtering, the processing such as demodulating, former electric signal is recovered.
Simultaneously, it is seen that optical sender and visible photoreceiver respectively further comprise an extra PD and LED, anti-for forming
To link, the transmission of Signalling exchange information is carried out.Then, processing locality and display module are responsible for the performance evaluation to reception signal
And display, mainly analysis and the information such as the current bit error rate of reality system.It is false under the good free space environment of channel
If being modulated using OOK, LED average transmitting power is designated as P, then the symbol sent{0,2P}；Assume again that and send bit " 0 "
The probability of " 1 " is identical, then, it is seen that the signal break-make decision rule of optical communication system is as follows
Wherein, x be OOK modulation in sampling, OOK modulate when sampling function x (t) Gaussian distributed.If its average is
A, variance are σ n2.V0 is decision threshold, when " 0 " is identical with the probability of " 1 ",
Bit error rate can be expressed as
Wherein, erfc (x) is complementary error function.
Cloud server module be used for by fructufies such as bit error rates when upload to cloud server module, be easy to storage and
Real time access.In the case where channel circumstance is good, according to the visible light communication system of above-mentioned structure, can missed shown in above formula
Under bit rate conditions, reliable data transfer is carried out.
In order to reach pinpoint purpose, the solution of the present invention is the underwater visible light communication of multidimensional based on location algorithm
The ranging localization of Sensor Network.I.e. in multidimensional underwater sensing net, it is a node to define a system, in waters of deploying troops on garrison duty
Launch multiple nodes.When underwater visible light channel changes, corresponding index parameter can occur significantly to change, such as errored bit
Rate raises, and network speed declines.The information that each node obtains can be sent to data in real time after processing locality and display module analysis
Storehouse and cloud server module, to realize investigation and monitoring to waters of deploying troops on garrison duty.
Node in monitoring waters is divided into this 3 kinds of beaconing nodes, anchor node and unknown node, and whole position fixing process is divided into two
Part：Anchor node positions and unknown node positioning.The locating periodically for defining each node is T1.Beaconing nodes need to dispose four with
Upper and outfit GPS, is directly contacted by acoustic signals with anchor node.Anchor node collects at least three above beaconing nodes position letter
Breath, the positional information of anchor node is calculated using trilateration.The location algorithm basic step of its unknown node is as follows：
(1) define unknown node only to be contacted with its local hop neighbor node, disappeared by the local with anchor node
Breath is transmitted to be positioned oneself.
(2) unknown node and the minimum hop count of anchor node are calculated.Anchor node obtains the position of oneself by beaconing nodes to be believed
After breath, its grouping information is broadcasted.Hop count field is initialized as 0, and hop-by-hop adds 1.In broadcasting process, anchor node will also be recorded and oneself arrived
The minimum hop count of other anchor nodes, unknown node recorded the minimum hop count of each anchor node, if receiving from same node
Identical data packet or the larger packet of hop count field, then give up.
(3) unknown node is calculated to the distance of anchor node.First calculate the Average hop distance D of anchor node, each anchor node
By obtained D broadcast packes to whole network.Unknown node is multiplied by unknown node j to anchor node i hop count using obtained D
Nij is the distance Dij that can obtain unknown node j to anchor node i：
(i=1,2 ... n is the numbering of anchor node)
1. the Di for calculating anchor node i is the anchor node and its border anchor node of all hop neighbors using its anchor node i
To calculate Di, Di values are made up of two parts node data, and anchor node j is an anchor node i hop neighbor node, and anchor node k is it
Boundary node.
2. unknown node receives the Di that other anchor nodes are sent, its weight proportion is calculated according to its hop count inverse, ai is
The corresponding anchor node i proportion factors.
Dij=D × NijDi
Wherein,
3. using the distance of unknown node to anchor node, pass through the positional information of maximum-likelihood method calculating unknown node.Not
It is (x1, y1) to know that node receives the anchor node Average hop distance of more than 3 its coordinate, (x2, y2), (x3, y3) ..., (xn,
Yn), if they to node A distance be respectively d1, d2, d3 ... dn,
If node A coordinate is (x, y), then have：
Last equation is individually subtracted with first equation, obtains：
Its linear equation representation is：AX=b, wherein：
Then the coordinate that node A can be obtained using the nonlinear IEM model of standard is
4. define the error positioned between Error is represented from i to j between actual range and estimated distance.Position error can
To be expressed from the next, the positioning precision of its energy assessment algorithm.
Wherein, E, F represent the number of simulation and the number of unknown node respectively.(xi, yi) represents the coordinate of known node,
(x'i, y'i) represents the coordinate of estimation node.
The effect of the present invention is further appreciated that for ease of technical staff, following analog result is now provided：
The scope that 100 nodes are randomly dispersed in 100 × 100m is defined, the accounting of wherein anchor node is adjustable, all nodes
Communication can be achieved in the range of R=50m.Influence to eliminate the contingency of distribution of results, simulate under the same conditions
80 times and take its average value.
Meanwhile anchor node ratio is set as 30%, node total number is changed to 150 from 60 and emulated again, tested
Node total number changes the influence to the algorithm positioning performance in the case that anchor node ratio is certain.Figure it is seen that with section
The increase of point sum, normalization position error gradually reduce.Further look at it can be found that when node total number reaches 80 curve
Tend towards stability, i.e. the performance of this algorithm tends towards stability.The position error of this algorithm drops than traditional underwater sensing net location algorithm
Low 4.3%~11.2% or so.Figure it is seen that each node error distribution of this algorithm is more uniform, i.e., this algorithm is public
Levelling and harmony are preferable.
Claims (5)
- A kind of 1. underwater visible light communication sensor network system of multidimensional based on ranging localization, it is characterised in that：The system includes anchor Node, network access module, network signal processing module, visible light communication transceiver machine A and B, electronic signal processing module, sheet Network signal is linked into the system by ground processing and display module, cloud server module and database, network access module, Network signal processing module is handled network signal, forms data signal, it is seen that optical sender A carries out electro-optic conversion, will Data signal is converted into optical signal and launched by light emitting diode, and receiving terminal B carries out optical-electrical converter and is loaded into telecommunications again Number processing module, network is passed in the same way after terminal recognition, at the same time, cloud server module is by processing locality The bit error rate analyzed with display module, the submarine site information drawn through location algorithm are uploaded to database in real time, and system is led to Crossing channel variation causes relevant parameter change to realize sensing.
- 2. the underwater visible light communication sensor network system of the multidimensional according to claim 1 based on ranging localization, its feature exist In the anchor node to monitor one of node in waters, except anchor node also has beaconing nodes and unknown node.
- 3. the underwater visible light communication sensor network system of the multidimensional according to claim 2 based on ranging localization, its feature exist It is divided into two parts in whole position fixing process：Anchor node positions and unknown node positioning, and the locating periodically for defining each node is T1, Beaconing nodes are directly contacted by acoustic signals with anchor node, and anchor node collects at least three above beaconing nodes positional information, profit The positional information of anchor node is calculated with trilateration.
- 4. the underwater visible light communication sensor network system of the multidimensional according to claim 2 based on ranging localization, its feature exist More than four need to be disposed in beaconing nodes and are equipped with GPS.
- 5. the underwater visible light communication sensor network system of the multidimensional according to claim 2 based on ranging localization, its feature exist It is as follows in the basic step of the location algorithm of the unknown node：(1) define unknown node only to be contacted with its local hop neighbor node, passed by the local message with anchor node Pass to be positioned oneself；(2) unknown node and the minimum hop count of anchor node are calculated, after anchor node obtains the positional information of oneself by beaconing nodes, Broadcast its grouping information, hop count field is initialized as 0, and hop-by-hop adds 1, and in broadcasting process, anchor node will also record and oneself arrive other The minimum hop count of anchor node, unknown node recorded the minimum hop count of each anchor node, if receiving from the identical of same node Packet or the larger packet of hop count field, then give up；(3) unknown node is calculated to incite somebody to action to the Average hop distance D of the distance of anchor node, first calculating anchor node, each anchor node The D broadcast packes arrived are multiplied by unknown node j to anchor node i hop count Nij i.e. to whole network, unknown node using obtained D It can obtain unknown node j to anchor node i distance Dij：(i=1,2 ... n numbers for anchor node).
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| CN110728021A (en) * | 2019-09-05 | 2020-01-24 | 杭州电子科技大学 | Microstrip filter antenna design method based on improved binary whale optimization algorithm |
| CN113132022A (en) * | 2021-04-13 | 2021-07-16 | 浙江大学 | Underwater non-contact type electric energy data transmission system |
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Application publication date: 20180403 |