CN103648082A - WIFI-based intelligent positioning and synchronization method in wireless link - Google Patents
WIFI-based intelligent positioning and synchronization method in wireless link Download PDFInfo
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- CN103648082A CN103648082A CN201310650198.3A CN201310650198A CN103648082A CN 103648082 A CN103648082 A CN 103648082A CN 201310650198 A CN201310650198 A CN 201310650198A CN 103648082 A CN103648082 A CN 103648082A
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Abstract
The invention, which belongs to the field of the coal mining industry technology, relates to an intelligent positioning method for a coal mine and a concrete algorithm. According to the method, a PTP clock synchronization system is used for replacing a GPS clock synchronization system under the coal mine to solve a clock synchronization problem of a WiFi base station; and when an Ethernet switch connected with the base station is used as a boundary clock, synchronization precision of the adjacent base station can reach the nanosecond level. On the basis of the study and analyzing of the synchronization technology and the positioning technology in an IEEE1588 protocol-based personal positioning system, the positioning performance is simulated and verified. The simulation result demonstrates that an NLOS error in underground positioning can be effectively restrained by using the TDOA mixed positioning algorithm; compared with utilization of the single Chan algorithm and the Taylor algorithm, the utilization of the TDOA mixed positioning algorithm enables the positioning precision to be high, so that a problem of precise positioning of the current personal positioning system under the coal mine can be effectively solved.
Description
Technical field
The invention belongs to industry technology field, colliery, the present invention relates to intelligent locating method and the specific algorithm in colliery.
Background technology
At present along with coal mining accident has become domestic production safety problem, as the running fix network of one of intelligent positioning system important foundation, under this context request, propose.All there is the problem of precision in traditional navigation system.Base station nanosecond, the basic thought of Synchronization Network was that mobile node in certain communication range exchanges positional information separately mutually by WIFI pulse, and connected automatically and set up one to mobile fixer network.The single-hop communication scope of node only has tens meters, and each node is not only a transceiver, while or a router.Therefore the mode that adopts multi-hop data retransmission to farther synchronization node.Mobile node MANET can complete information interaction, and emergency is reminded, and miner monitors in real time, assists and withdraws function, effectively avoids mine disaster, can utilize in addition stationary nodes access fixed network, realizes location management and control and information issue etc.
Such as for tunnel provides congestion information, raise the efficiency; For withdrawing, provide navigation Service, increase fail safe.
The present invention is nanosecond based on above under industry background just, a kind of mobile impulsive synchronization net intelligence positioning and communicating method of servicing of proposition.
Summary of the invention
The object of the invention is to propose a kind of intelligent locating method of colliery and the synchronous method in relevant wireless link.This object realizes by the following method:
By IEEE1588 pulse radio transceiver machine, the signal of telecommunication is converted to time signal, signal is sent out by atmospheric channel, receiving terminal signal focus in photodetector, photodetector converts bag signal to time signal.
According to an aspect of the present invention, source mobile node and near form comprehensive synchronizing network to position communication between mobile node, in network, each node is collected self locating information around and sends other nodes in network to, and information also can be sent in this network by stationary nodes.The inventive method can be prevented the generation of serious coal mining accident.
Described system comprises: user interface, and signal generator, synchronized transmissions terminal, receives sound system, and detector of sound, synchronously receives terminal, temporal information Nonlinear Dynamic filter processing unit, terminal light-emitting diode display.
According to the present invention proposes a kind of in wireless link nanosecond information filter method.In the network of packet of pulses, all can there is the loss of bit or byte all the time, easier drop-out in mobile node walking particularly, traditional re-transmission error correction method is inoperative, and the object moving when by the time requiring to retransmit is not often in original place; Traditional not retransmit error correction method also inoperative, because coding limit is due to multiple reflection effect, is often lost.
Packet of pulses transceiver machine can utilize the battery-operated of mobile node generation, without carrying in addition power supply.The time signal precision that packet of pulses transceiver produces is adjustable.IEEE1588 transceiver machine converts distance signal to time signal, and afferent message processing unit, is presented on terminal display after processing.Mobile node is in motion state, and the information of losing is more than the information of makeing mistakes, and it is essential that the benefit of gathering materials on the spot is damaged function, so information process unit also comprises error correction and mends damage unit, realize the error correction of information coding and damage function with benefit, lower the error rate, improve the reliability of communication.The core of mend damaging unit is to utilize the shaping algorithm redundant information of time and space association of sublating, and space encoder is left for to important code section Side marker information, guarantees the integrality of frame structure, so that the blind benefit algorithm of Intelligent Forecasting that implementation of class is gone out walking in the night like bat.
Accompanying drawing explanation
Fig. 1 is the traffic diagram of intelligent synchronization net of the present invention
Fig. 2 is packet of pulses traffic diagram detailed between mobile node of the present invention
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
All power-offs of node shown in Fig. 1 112, when it is near node 104 time, node 112 can only be detected according to electric wave by node 104.Node 106 is not installed system of the present invention, but it has repeater system, node 104 is provided with the system of current period engineering, node 112 can be passive by node 104, detected, node 106 can initiatively be detected by node 104 more accurately, by the electric pulse of both direction, when between node mutually near time calculate each node location information
.node shown in Fig. 2 can be used dynamic filter algorithm.
By reference to the accompanying drawings enforcement of the present invention is done as detailed below:
According to the above, just can realize the present invention.Other variations and modification that those skilled in the art is made in the case of without departing from the spirit and scope of protection of the present invention, within being still included in protection range of the present invention.
Claims (6)
1. the invention belongs to industry technology field, colliery, the present invention relates to intelligent locating method and the specific algorithm in colliery, propose first to utilize clock synchronization compliant with precision time protocol synchro system to replace gps clock synchro system to solve the clock synchronization issue of Wi-Fi base station under ore deposit, in situation using the Ethernet switch being connected with base station as boundary clock, the synchronization accuracy of adjacent base station can reach nanosecond rank, by the research and analysis of the simultaneous techniques in the personnel location system to based on IEEE1588 agreement and location technology, positioning performance has been carried out to simulating, verifying, simulation result shows that improved TDOA mixed positioning algorithm can effectively suppress the NLOS error in location, down-hole, with respect to using single Chan algorithm and Taylor algorithm to there is higher positioning precision, can effectively solve the accurate orientation problem of personnel location system under current ore deposit.
2. method as claimed in claim 1, utilizes clock synchronization compliant with precision time protocol synchro system to replace gps clock synchro system to solve the clock synchronization issue of Wi-Fi base station.
3. method as claimed in claim 1, by IEEE1588 pulse radio transceiver machine, the signal of telecommunication is converted to time signal, signal is sent out by atmospheric channel, receiving terminal signal focus in photodetector, photodetector converts bag signal to time signal.
4. method as claimed in claim 1, source mobile node and near form comprehensive synchronizing network to position communication between mobile node, in network, each node is collected self locating information around and sends other nodes in network to, information also can be sent in this network by stationary nodes, and the inventive method can be prevented the generation of serious coal mining accident.
5. method as claimed in claim 1, the problem existing in IEEE1588 protocol synchronization process, analyzed the impact of the asymmetric factor of communication path on Network Synchronization, and then proposed a kind ofly based on moving average filtering and time-weighted improvement algorithm, and by OPNET simulation software, algorithm has been carried out to simulating, verifying.
6. method as claimed in claim 1, personnel location system basic composition and network model based on IEEE1588 agreement, on affecting the main error of positioning precision in system position fixing process, be studied analysis, location algorithm based on TDOA has been proposed, to making a concrete analysis of respectively in Dual base stations and many base stations situation, the mixed positioning algorithm of a kind of anti-NLOS has been discussed, this algorithm can still keep good positioning precision in NLOS environment, and the simulation results show by Matlab its can meet the pinpoint needs in down-hole.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105554882A (en) * | 2016-01-29 | 2016-05-04 | 中国海洋大学 | 60GHz non-line of sight (NLOS) identification and wireless fingerprint positioning method based on energy detection |
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| CN101697502A (en) * | 2009-09-22 | 2010-04-21 | 哈尔滨工业大学 | Method for precisely synchronizing wireless sensor network under coal mine |
| WO2011134371A1 (en) * | 2010-04-26 | 2011-11-03 | 中兴通讯股份有限公司 | Method for synchronizing clocks and clock synchronization device |
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| CN101221689A (en) * | 2007-12-06 | 2008-07-16 | 上海大学 | Down-hole wireless safety monitoring system based on 2.4 GHz and 433 MHz frequency band mixed grouping |
| CN101697502A (en) * | 2009-09-22 | 2010-04-21 | 哈尔滨工业大学 | Method for precisely synchronizing wireless sensor network under coal mine |
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| 刘晓晓: "IEEEl588协议在井下精确定位中的应用研究", 《江苏大学硕士学位论文》, 8 October 2013 (2013-10-08), pages 1 - 3 * |
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| CN105554882A (en) * | 2016-01-29 | 2016-05-04 | 中国海洋大学 | 60GHz non-line of sight (NLOS) identification and wireless fingerprint positioning method based on energy detection |
| CN105554882B (en) * | 2016-01-29 | 2019-01-18 | 中国海洋大学 | The identification of 60GHz non line of sight and wireless fingerprint positioning method based on energy measuring |
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Application publication date: 20140319 |
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