CN108595822A - A kind of method for building up of ocean inductively anchor tethers transmission channel multipath mathematical model - Google Patents
A kind of method for building up of ocean inductively anchor tethers transmission channel multipath mathematical model Download PDFInfo
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- CN108595822A CN108595822A CN201810356673.9A CN201810356673A CN108595822A CN 108595822 A CN108595822 A CN 108595822A CN 201810356673 A CN201810356673 A CN 201810356673A CN 108595822 A CN108595822 A CN 108595822A
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Abstract
The present invention is directed to the demand of a large amount of monitoring data high speed real-time Transmission functions of the more elements of abyssal environment, and improve ocean has important research significance with inductively anchor tethers data transmission technology.Seawater is as the important transmission medium in inductively channel, electric signal transmission in infinitely great seawater space has multipath effect, multi-path delay spread effect can be enhanced by improving the transmission frequency of signal, receive intersymbol interference and the enhancing of Selective intensity effect of signal, the signal-to-noise ratio of transmission signal is reduced, but is still blank for the research of this problem.The present invention proposes a kind of method for building up of ocean inductively anchor tethers transmission channel multipath mathematical model, the quasi- method using finite element simulation and numerical computations determines the key parameters such as number of paths, time delays amount and amplitude attenuation amount, multipath channel mathematical model of the signal in the seawater in transmission process is established, analyzes multipath effect on this basis to transmitting the affecting laws of signal.The present invention is solves the problems, such as that inductively multipath effect provides important theoretical foundation.
Description
Technical field
The present invention proposes that a kind of ocean inductively anchor tethers transmits using inductively anchor tethers transmission channel as prototype
The method for building up of channel multi-path mathematics model belongs to electronic information technology, the fields such as ocean observation technology.
Background technology
Inductively important technology one of of the anchor tethers transmission communication technology as Ocean Surveying is former using electromagnetic induction
Reason realizes contactless underwater signal transmission, be it is a kind of effectively, economic, reliable method, be suitable for the transmission of deep-sea data, can will
It is using in the profile survey of Yu Haiyang stereopsis network construction.Inductively anchor tethers, which is mainly acquired by underwater data, is
System, transmission channel and reception terminal three parts waterborne composition, wherein transmission channel are made of coupling magnet ring, transmission cable and water body.
In the practical measurement work in inductively ocean, transmission cable forms a closed circuit with seawater, and infinitely great deep sea waters are made
For a part for electric signal transmission closed circuit, electric signal is transferred to the other end, underwater data acquisition system from one end of wirerope
In sensor complete the acquisition to information such as ocean temperature, salinity under different depth, and data are preserved and pass to water
Lower magnet ring, is then transferred to magnet ring waterborne again by being inductively transferred to single-turn circular coil, is finally delivered to terminal waterborne and carries out
Processing.
Currently, marine technology expert appoints specifically for ocean observation platform subaqueous survey real-time data transmission in the world
Business demand, innovative development apply inductively data transmission technology, and this technology is based on inductively principle, with seawater, determine
The anchor heaving pile of point observation platform is transmission medium, using anchor system as a part for transmission link, realizes the observation of subaqueous survey instrument
The real-time Transmission of data, can meet the oceanographic observation application demand of multinode depth 300m, and transmission rate is most fast reachable
9600bps；The country has also carried out key technology research in this respect, has been successfully applied in the marine environment of the 300m depth of waters at present
In, it can be achieved that 1 hour primary data is quasi real time transmitted, transmission rate is in 1200bps.China is existing at this stage inductively
Transmission technology whether on transmission speed, transmission range, number of nodes, the system integration or environmental suitability all with state's external memory
In larger gap.The present invention studies the characteristic of channel of inductively anchor tethers by establishing multi-path channel model,
The important factor in order of analyzing influence inductively channel transfer characteristic, to improve the channel transfer characteristic of inductively anchor tethers
Provide a kind of new Research Thinking.
Invention content
The purpose of the present invention is influence inductively transmission system by establishing inductively multi-path channel model analysis
The key factor of system, and propose solution, improve the coupling efficiency of overocean communications system transmission channel.First, according to deep-sea
The inductively electromagnetic coupling principle of transmission channel, using COMSOL research seawater parameters (such as conductivity), channel architecture is (such as
Magnet ring parameter, wirerope parameter etc.) and the key parameters such as signal characteristic (such as frequency, amplitude) are transmitted to current density in seawater point
The affecting laws of cloth, the final path profile form for determining multi-path channel.Secondly as signal passes through sea by wirerope one end
Water is transmitted to the other end, and there is multipath effects for electric signal transmission, simply may be used according to how the characteristic distributions of signal establish one
Capable multipath channel models have important research significance for the transmission performance for improving signal.
The present invention simplifies complex model as research object using inductively mooring system transmission channel, respectively
It calculates the number of paths of division, the amount of delay of each path and amplitude attenuation amount parameter and finally establishes FIR multipath channel mathematics
Model, path of Research quantity, time delay expansion and amplitude decline are to the action rule of transmission signal, the decline spy of analysis transmission signal
Property.The invention is to provide the theoretical foundation of optimization channel model, and imitate to improving inductively mooring system transmission channel coupling
Rate has important theory directive significance.
Technical scheme of the present invention：
The present invention is based on the transmission channels of inductively mooring system, have invented multi-path channel model.According to deep-sea
The inductively electromagnetic coupling principle of transmission channel determines the path profile form of multi-path channel, using numerical computations
Method is estimated to establish the key parameter of multi-path channel model, and builds the FIR mathematical models of inductively transmission channel.Root
It is believed that number characteristic distributions establish the multipath channel models of a simple possible, the transmission performance for improving signal has important
Research significance.It can be expressed as, by establishing point of multi-path channel model analysis channel parameter in the seawater to electric signal
The influence of cloth.
The multi-path channel model of inductively anchor chain provided by the invention, comprises the concrete steps that：
1st step, the path profile form for determining Multipath Transmission
According to the electromagnetic coupling principle of deep-sea inductively transmission channel, seawater parameter (such as conductance is studied using COMSOL
Rate etc.), the key parameters such as channel architecture (such as magnet ring parameter, wirerope parameter) and transmission signal characteristic (such as frequency, amplitude)
To the affecting laws that current density in seawater is distributed, the final path profile form for determining multi-path channel, as shown in Figure 1.
Since signal is transmitted by seawater to the other end from wirerope one end, there is multipath effects for electric signal transmission, according to point of signal
The multipath channel models how cloth feature establishes a simple possible have important research for the transmission performance for improving signal
Meaning.
2nd step, the parameter of multi-path channel model calculate
Mesh generation method is used first, is calculated the path length in each grid, is finally synthesizing the total length of each path,
According to the transmission rate of electric signal, the amount of delay of each path is determined；Then according to transmission signal characteristic, research amount of delay with
Symbol relationship determines path division numbers according to delay code element number, simplifies multipath channel models, as shown in Figure 2；According to every road
Current density line radical in diameter, calculates the resistance value in the path, determines amplitude attenuation amount, as shown in Figure 3.
3rd step establishes Multipath Transmission mathematical model
The FIR of transmission channel is established according to the number of paths of division, the amount of delay of each path and amplitude attenuation amount parameter
Mathematical model, as shown in Figure 3.
4th step, the affecting laws for analyzing mathematical model transmission signal
According to the Multipath Transmission mathematical model of foundation, number of paths is calculated, time delay expansion and amplitude decline are to transmitting signal
Action rule, the fading characteristic of analysis transmission signal studies different transmission ranges, different frequency transmission signal multipath effect pair
Transmit the affecting laws of signal.
The advantages of the present invention：
The present invention is directed to the transmission channel of inductively anchor chain, establishes multi-path channel model.Since seawater is one
The open waters of a infinity, radio transmission has multipath effect to electric signal in the seawater, and establishing multipath channel models can be with
Preferably determine how the generation of resistance multipath effect, which kind of factor influences multipath effect, to propose to resist multipath effect
It influences, ensures the transmitting of signal in the seawater.Inductively high speed data transmission system is reliable to restricting deep-sea by the present invention
Property key technology studied, for improve transmission reliability more detailed solution is provided.
Description of the drawings
Fig. 1 is the distribution form using COMSOL simulation analysis signal path in the seawater.
Fig. 2 is the path division methods of multi-path channel model.
Fig. 3 is parameter calculating and the foundation of FIR mathematical models of multi-path channel model.
It is described further below in conjunction with attached drawing and by embodiment to the specific implementation mode of the present invention.
Specific implementation mode
Embodiment one
1st step, the path profile form for determining Multipath Transmission
Channel model is established using COMSOL, analyzes sea water conductivity, the parameters such as wirerope length and signal frequency are to mould
The influence of current density motion pattern, finally obtains electric signal and passes in the seawater in the current density distribution of type cross section and seawater
Defeated Multipath distribution form.
2nd step, the parameter of multi-path channel model calculate
It carrying out a point diameter for the current density distributing figure of multi-path channel model and divides, modeling wirerope length is 300m,
Model computational domain is 6000m3, the motion pattern that simulation result is obtained carries out square net subdivision, is dredged according to curve in figure
Motion pattern is divided into routine by the bending degree of close degree and curve, roughening, refinement and the grid of superfine four kinds of different length of sides
(four kinds of different side length of element are distributed as the 1/2,1/4,1/8,1/16 of wirerope length), by the length of streamline and grid division
The length of side or diagonal line do approximate calculation, calculate the length in each grid, are finally synthesizing electric signal transmission path in the seawater
Total length (shortest path 300m, longest path 1940m).Due to electric signal in the medium transmission rate it is opposite with medium be situated between
Electric constant is related, sea water permittivity 81, the rate being transmitted in the seawater
Determine that symbol width is 1 × 10 for 9.6kHz transmission frequencies-4S, according to the ratio of each path amount of delay and symbol width into
Row, which is sorted out, to be divided, and determines that the diameter number of the model is divided into 10 (τmax=5 × 10-5S, τmin=9 × 10-6S), according in model
The current density line radical (A being calculatedn=23,19,15,12,10,8,6,4,2,1, wherein n=1...10), calculating should
Resistance value (the R in pathn=1/An), determine that amplitude attenuation amount, parameter result of calculation are as shown in table 1.
1 wirerope length of table is 300m, and transmission frequency is the 10 diameter path calculating parameters of 9600Hz
| Serial number | Path attenuation amount gi | Amount of delay τi(s) |
| 1 | 0.23 | 5.0×10-5 |
| 2 | 0.19 | 4.5×10-5 |
| 3 | 0.15 | 3.7×10-5 |
| 4 | 0.12 | 3.0×10-5 |
| 5 | 0.10 | 2.4×10-5 |
| 6 | 0.80 | 1.9×10-5 |
| 7 | 0.60 | 1.5×10-5 |
| 8 | 0.40 | 1.2×10-5 |
| 9 | 0.20 | 1.0×10-5 |
| 10 | 0.10 | 9.0×10-6 |
3rd step establishes Multipath Transmission mathematical model
Based on FIR mathematical models, Multipath Transmission mathematical modeling formula is as follows.
Wherein, f is frequency transmission signal, and N is number of paths, giFor amplitude attenuation amount, τiFor amount of delay, α is fading channel
Parameter.The corresponding amplitude attenuation amount g of each pathsnWith amount of delay τnIt is different, result of calculation is as shown in table 1.
4th step, the affecting laws for analyzing mathematical model transmission signal
According to the Multipath Transmission mathematical model of foundation, with reference to the computational methods of second step, calculating transmission range is 300m,
1000m and 5000m, the model parameter of frequency transmission signal 1.2kHz, 9.6kHz, 100kHz and 500kHz, analysis multipath effect
The affecting laws of reply transmission signal, as shown in table 2.When transmission frequency is less than 9.6kHz and transmission range is less than 1000m, letter
Number amplitude change rate is less than 0.3%, and multipath effect is not obvious, with the increase of transmission frequency and transmission range, multipath effect
Influence to signal can gradually increase, and when transmission frequency is 500kHz and transmission range is 5000m, signal amplitude change rate is
11.56%, multipath effect can influence the reliability of signal transmission.
It can be drawn the following conclusions by above-mentioned analysis：Based on the underwater data Transmission system of inductively principle due to more
Diameter effect exists so that signal is transmitted in circuit in the seawater there is time variation, is existed with transmission speed, time, wavelength
The contact of countless ties, the reliability of meeting strong influence Transmission system.The present invention is to solve inductively multipath effect to ask
Topic provides important theoretical foundation.
Table 2 is in the transmission path that seawater and wirerope form, and using the theoretical model of Multipath Transmission, divides under multiple paths
Analysis signaling rate, wirerope length are to transmitting the affecting laws (transmission path tentatively quasi- is chosen for 10 diameters) of signal
Claims (1)
1. a kind of ocean method for building up of inductively anchor tethers transmission channel multipath mathematical model, comprises the concrete steps that：
1st step, the current density distributing figure for establishing signal Multipath Transmission in the seawater
General 300m long anchors system wirerope transmission channel model is established using COMSOL softwares, it is 1S/ to analyze sea water conductivity
M, 4S/m, 10S/m and signal transmission frequencies are 1.2kHz, to the shadow of transmission signal current density distribution in the seawater under 9.6kHz
Rule is rung, the current density distributing figure that signal transmits in the seawater is established, the final path profile shape for determining multi-path channel
Formula.
2nd step, the parameter of multi-path channel model calculate
It carrying out a point diameter for the current density distributing figure of multi-path channel model and divides, model anchor system wirerope length is 300m,
Model computational domain chooses 6000m3, side length of element is distributed as the 1/2 of anchor system wirerope length, and 1/4,1/8,1/16, final determine should
Shortest path is 300m, longest path 1940m in model, determines that maximum delay amount is 5 × 10 according to path difference-5S, for
9.6kHz transmission frequencies determine that symbol width is 1 × 10-4S is returned according to the ratio of each path amount of delay and symbol width
Class divides, and determines that the diameter number of the model is divided into 10, maximum delay amount is 5 × 10-5S, minimum amount of delay are 9 × 10-6S, root
According to the current density line radical (A being calculated in modeln=23,19,15,12,10,8,6,4,2,1, wherein n=
1...10), the resistance value (R in the path is calculatedn=1/An), determine amplitude attenuation amount.
3rd step establishes Multipath Transmission mathematical model
According to obtained model parameter calculated above, the FIR mathematical models of multi-path channel are established, expression formula is as follows.
Wherein, f is frequency transmission signal, and N is number of paths, giFor amplitude attenuation amount, τiFor amount of delay, α joins for fading channel
Number.
4th step, based on channel mathematics model analysis multipath effect to transmit signal affecting laws
Mathematical model based on Multipath Transmission, calculate in tetra- kinds of transmission frequencies of 1.2kHz, 9.6kHz, 100kHz, 500kHz and
Model parameter under tri- kinds of wirerope length of 300m, 1000m and 5000m analyzes affecting laws of the multipath effect to transmission signal,
When transmission frequency is less than 9.6kHz and transmission range less than 1000m, signal amplitude change rate is less than 0.3%, and multipath effect is not
Obviously, with the increase of transmission frequency and transmission range, influence of the multipath effect to signal can gradually increase, when transmission frequency is
When 500kHz and transmission range are 5000m, signal amplitude change rate is 11.56%, and what multipath effect can influence signal transmission can
By property.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641467A (en) * | 2019-03-01 | 2020-09-08 | 天津工业大学 | Marine inductive coupling chain communication method for resisting seawater multipath effect |
| CN112564314A (en) * | 2020-12-18 | 2021-03-26 | 天津工业大学 | Implementation method for improving multi-node electric energy transmission efficiency of marine inductive coupling anchor chain |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567863A (en) * | 2008-04-24 | 2009-10-28 | 魏昕 | Indirect self-adaptive balancing method of shallow-sea underwater acoustic communication system |
| CN101699710A (en) * | 2002-05-13 | 2010-04-28 | 捷通国际有限公司 | Contact-less power transfer and method |
| JP2015119404A (en) * | 2013-12-19 | 2015-06-25 | トヨタ自動車株式会社 | Multi-pass determination device |
| CN106028414A (en) * | 2016-06-21 | 2016-10-12 | 清华大学深圳研究生院 | Reverse underwater positioning method and system |
| CN107070570A (en) * | 2017-03-28 | 2017-08-18 | 天津工业大学 | Inductively overocean communications system channel characteristic research and analysis based on frequency sweep method |
-
2018
- 2018-04-16 CN CN201810356673.9A patent/CN108595822B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699710A (en) * | 2002-05-13 | 2010-04-28 | 捷通国际有限公司 | Contact-less power transfer and method |
| CN101567863A (en) * | 2008-04-24 | 2009-10-28 | 魏昕 | Indirect self-adaptive balancing method of shallow-sea underwater acoustic communication system |
| JP2015119404A (en) * | 2013-12-19 | 2015-06-25 | トヨタ自動車株式会社 | Multi-pass determination device |
| CN106028414A (en) * | 2016-06-21 | 2016-10-12 | 清华大学深圳研究生院 | Reverse underwater positioning method and system |
| CN107070570A (en) * | 2017-03-28 | 2017-08-18 | 天津工业大学 | Inductively overocean communications system channel characteristic research and analysis based on frequency sweep method |
Non-Patent Citations (4)
| Title |
|---|
| JING LI 等: "Simplified relay antenna selection with source beamforming for MIMO two-way relaying networks", 《SCIENCE CHINA》 * |
| 许斌 等: "QPSK信号多径衰落信道的建模与误码率仿真", 《第十四届全国青年通信学术会议论文集》 * |
| 陈中江: "海洋监测锚系耦合链通信传输系统研制", 《万方数据库.学位论文库》 * |
| 黄仰博 等: "基于FIR模型的多径抑制方法研究", 《信号处理》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641467A (en) * | 2019-03-01 | 2020-09-08 | 天津工业大学 | Marine inductive coupling chain communication method for resisting seawater multipath effect |
| CN112564314A (en) * | 2020-12-18 | 2021-03-26 | 天津工业大学 | Implementation method for improving multi-node electric energy transmission efficiency of marine inductive coupling anchor chain |
| CN112564314B (en) * | 2020-12-18 | 2024-02-09 | 天津工业大学 | Implementation method for improving multi-node power transmission efficiency of marine inductive coupling anchor chain |
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