CN1953408A - A method to realize real-time monitoring of the underground coal miners by ZigBee network - Google Patents

A method to realize real-time monitoring of the underground coal miners by ZigBee network Download PDF

Info

Publication number
CN1953408A
CN1953408A CNA2006100976372A CN200610097637A CN1953408A CN 1953408 A CN1953408 A CN 1953408A CN A2006100976372 A CNA2006100976372 A CN A2006100976372A CN 200610097637 A CN200610097637 A CN 200610097637A CN 1953408 A CN1953408 A CN 1953408A
Authority
CN
China
Prior art keywords
router
base station
network
information
locator
Prior art date
Application number
CNA2006100976372A
Other languages
Chinese (zh)
Other versions
CN100481797C (en
Inventor
金澔
Original Assignee
金澔
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 金澔 filed Critical 金澔
Priority to CNB2006100976372A priority Critical patent/CN100481797C/en
Publication of CN1953408A publication Critical patent/CN1953408A/en
Application granted granted Critical
Publication of CN100481797C publication Critical patent/CN100481797C/en

Links

Abstract

The invention relates to a method for real-time detecting under-mine worker via IEEE802.15.4 technique. Wherein, it arranges one or several networks at tree, star or mesh structure in the under-mine channel; each network is formed by one base station and several routes; the worker is arranged with positioning device; the base station, route and positioning device are connected via IEEE802.15.4 wireless network protocol; the base station and superior control computer are connected by Ethernet or RS485 communication protocol; the RRSI value of wireless electric signal between network nodes is relative to the spatial distance, via self learnt network, said relationship can be fixed, and the positioning device can via said relationship and tested RRSI value, fixes the spatial position and sends the information to the computer control system to real-time detect the under-mine worker.

Description

Utilize the ZigBee network to realize the coal mine down-hole personnel method of monitoring in real time

Technical field

The invention belongs to a kind of safety of coal mines technical field, specifically is to utilize the IEEE802.15.4 network technology to realize the coal mine down-hole personnel method of monitoring in real time.

Background technology

The China's coal-mine security incident frequently takes place, and some collieries take place after the mine disaster, and personnel in the pit's number and accurate position can't be provided, and has had a strong impact on the search operations of mine disaster.At present, the data transmission medium of domestic coal mine underground monitoring, monitoring system is mainly cable, transmission means is an analog quantity, there is following defective in this purpose monitoring system, working environment at coal mines is abominable, and cable subjects to damage, in case this situation takes place, difficult definite system failure point influences the normal use of system; This external system adopts analog quantity to carry out transfer of data and exchange, and poor anti jamming capability easily causes wrong report; The sorts of systems that present colliery puts into effect all can not provide personnel in the pit's Kinematic Positioning and speech communication, and wrecked personnel can't in time be succoured.

IEEE802.15.4 is a kind of wireless network communication technique standard of rising in recent years, have low-power consumption, low cost, low complex degree, low rate, in short-term, the characteristic of high safety, be suitable for very much network requirement such as security information collection and communication under the colliery.

Summary of the invention

The purpose of this invention is to provide a kind of IEEE802.15.4 of utilization network technology and realize the coal mine down-hole personnel method of monitoring in real time, can be by computer at the situation of aboveground real-time understanding down-hole miner, the IEEE802.15.4 network technology have power saving, reliable, cost is low, time delay is short, network capacity is big, major advantage such as safe, be to solve the communication under the coal mine and the practical scheme of dynamic monitoring at present.

Technical scheme of the present invention is as follows:

A kind of IEEE802.15.4 network technology of utilizing realizes the coal mine down-hole personnel method of monitoring in real time, it is characterized in that may further comprise the steps:

(1) be provided with at underworkings one or more, tree-shaped, starlike, the cancellated network of tool, each network is made up of a base station (Tunnel Position Gateway--TPG) and several routers (TunnelPosition Router--TPR).Base station (TPG) is arranged in the initiating terminal of network, along the network bearing of trend, a plurality of routers is set at a certain distance, placement positioning device on one's body underground operators (Tunnel Position Device--TPD).Adopt the IEEE802.15.4 wireless network protocol to realize wireless transmission between base station and router, the locator, carry out exchanges data by Ethernet or RS485 communications protocol between base station and the aboveground control computer;

(2) carry out netinit, send initialization package by the base station, each router of base station periphery at first receives initialization package, router is embedded in the processor that declines increases by 1 with initialization package middle distance counter value (Hop), and will append self networks ID or IEEE identification address, transmit to the next router of network, simultaneously that this is new packet sends it back the base station again.After the next neighbor router is received new initialization package, repeat upper router data handling procedure, and continue to transmit to the next router, simultaneously that this is new packet sends it back base station or upper router, to the tail end to network.

After the base station receives the packet that returns from each router, via embedded microprocessor according to minimal path priority algorithm (Short Distance First), range information in the packet that returns according to each router, determine distance with self, distinguish the relative position of upper level router and next stage router, set up the data transfer path option table.

Each level router from the range information in the packet of upper or the next router, with the range information comparison of self, is distinguished the relative position of upper router and the next router according to what receive, sets up its data selection of transmission paths table.

(3) locator determining at the down-hole coordinate position, because base station, router belongs to prior fixed point setting, the coordinate data of its each position is known, when the personnel in the pit who disposes locator when underworkings moves, can receive and close on each router and send at interval the ICQ signal simultaneously by setting-up time, the ICQ information packet of cycle emission contains the ID and the coordinate information of emission router, after locator receives these RI radio intelligence, the embedded microprocessor that includes will be according to these information and the numerical value of measuring the energy RRSI (the radio signal strength indication that Receive Signal Strength ind.cator accepts) of each router radio signal, adopt the location algorithm of Anhui farsighted instrument ANT Nachrichtentechnik GmbH research and development, calculate the relative position of self.

This location algorithm principle is according under the specific environment, there is mathematical relationship between RRSI value between each node of network and the space length, self study by network, determine this mathematical relationship, locator is determined the relative position in its space according to mathematical relationship of setting up and the new RRSI value of measuring afterwards.

(4), each router is received the information of sending from locator, outwards transmit after adding self range information, after other router is received this information, judge that this information is to send or the next router sends from upper router, for the information that upper router sends, will not transmit; The information of sending for the next router continues outwards to transmit, and carries out successively, is finally received the coordinate information of locator by the base station, and by base station transmits to aboveground control computer.

Described base station, locator, wireless router constitute by microprocessor, ZigBee wireless transmission chip and external antenna, and the base station is by TCP/IP or the communication of RS485 procotol brow-up position, the communication of IEEE802.15.4 procotol brow-down position.

On miner's mine lamp, have locator (TPD) when moving in the down-hole, can periodically repeat said process, after these locator coordinate informations continuously are forwarded to ground-based computer, will show the Position Approximate of each miner on the mine three-dimensional digit map in the master-control room of ground in the down-hole.

The present invention is depended on the density of wireless router and the reasonability of distribution to the accuracy of locator coordinate setting, and sampling time interval, when router density bigger, distribution uniform, sampling time interval is short, the accuracy of identification of system is just high more.

The present invention adopts the wireless network transmissions mode, is the center with the exploiting field, and the segmentation networking adopts 100 m ethernet to connect between each zoning section, guarantee data transmission quality, has extremely strong antijamming capability; Wireless router, base station in the network are powered by high capacity cell, and acquisition control circuit and input, output circuit are thoroughly isolated on electric, have improved reliability of operation.

Description of drawings

Fig. 1 is wireless network architecture figure of the present invention.

Embodiment

A kind of IEEE802.15.4 network that utilizes is realized the coal mine down-hole personnel method of monitoring in real time, may further comprise the steps:

(1) be provided with at underworkings one or more, tree-shaped, starlike, the cancellated network of tool, each network is made up of a base station (Tunnel Position Gateway--TPG) and several routers (TunnelPosition Router--TPR).Base station (TPG) is arranged in the initiating terminal of network, along the network bearing of trend, a plurality of routers is set at a certain distance, placement positioning device on one's body underground operators (Tunnel Position Device--TPD).Adopt the IEEE802.15.4 wireless network protocol to realize wireless transmission between base station and router, the locator, carry out exchanges data by Ethernet or RS485 communications protocol between base station and the aboveground control computer;

(2) carry out netinit, send initialization package by the base station, each router of base station periphery at first receives initialization package, router is embedded in the processor that declines increases by 1 with initialization package middle distance counter value (Hop), and will append self networks ID or IEEE identification address, transmit to the next router of network, simultaneously that this is new packet sends it back the base station again.After the next neighbor router is received new initialization package, repeat upper router data handling procedure, and continue to transmit to the next router, simultaneously that this is new packet sends it back base station or upper router, to the tail end to network.

After the base station receives the packet that returns from each router, via embedded microprocessor according to minimal path priority algorithm (Short Distance First), range information in the packet that returns according to each router, determine distance with self, distinguish the relative position of upper level router and next stage router, set up the data transfer path option table.

Each level router from the range information in the packet of upper or the next router, with the range information comparison of self, is distinguished the relative position of upper router and the next router according to what receive, sets up its data selection of transmission paths table.

(3) locator determining at the down-hole coordinate position, because base station, router belongs to prior fixed point setting, the coordinate data of its each position is known, when the personnel in the pit who disposes locator when underworkings moves, can receive and close on each router and send at interval the ICQ signal simultaneously by setting-up time, the ICQ information packet of cycle emission contains the ID and the coordinate information of emission router, after locator receives these RI radio intelligence, the embedded microprocessor that includes will be according to these information and the numerical value of measuring the energy RRSI of each router radio signal, adopt following location algorithm, calculate the relative position of self.

This location algorithm is under specific colliery underworkings environment, corresponding relation between different space length in the Measurement Network between router and the locator and the decay of RRSI value (router sends and the RRSI value variation of locator when receiving), according to this corresponding relation, sum up to conclude and obtain the experience mathematical relationship, self study by network, determine this mathematical relationship, locator is determined the relative position in its space according to experience mathematical relationship of setting up and the new RRSI value of measuring afterwards.

(4) each router is received the information of sending from locator, outwards transmit after adding self range information, after other router is received this information, judge that this information is to send or the next router sends from upper router, for the information that upper router sends, will not transmit; The information of sending for the next router continues outwards to transmit, and carries out successively, is finally received the coordinate information of locator by the base station, and by base station transmits to aboveground control computer.Base station, locator, wireless router are made of microprocessor, ZigBee wireless transmission chip and external antenna, and the base station is by TCP/IP or the communication of RS485 procotol brow-up position, the communication of IEEE802.15.4 procotol brow-down position.

Claims (2)

1, a kind of IEEE802.15.4 network technology of utilizing realizes the coal mine down-hole personnel method of monitoring in real time, it is characterized in that may further comprise the steps:
(1) be provided with at underworkings one or more, tree-shaped, starlike, the cancellated network of tool, each network is made up of a base station and several routers; Arrangement of base stations along the network bearing of trend, is provided with a plurality of routers at the initiating terminal of network at a certain distance, placement positioning device on one's body underground operators; Adopt the IEEE802.15.4 wireless network protocol to realize wireless transmission between base station and router, the locator, carry out exchanges data by Ethernet or RS485 communications protocol between base station and the aboveground control computer;
(2) carry out netinit, send initialization package by the base station, each router of base station periphery at first receives initialization package, router is embedded in the processor that declines increases by 1 with initialization package middle distance counter value Hop, and will append self networks ID or IEEE identification address, transmit to the next router of network, simultaneously that this is new packet sends it back the base station again; After the next neighbor router is received new initialization package, repeat upper router data handling procedure, and continue to transmit to the next router, simultaneously that this is new packet sends it back base station or upper router, to the tail end to network; After the base station receives the packet that returns from each router, via embedded microprocessor according to the minimal path priority algorithm, range information in the packet that returns according to each router, determine distance with self, distinguish the relative position of upper level router and next stage router, set up the data transfer path option table;
Each level router from the range information in the packet of upper or the next router, with the range information comparison of self, is distinguished the relative position of upper router and the next router according to what receive, sets up its data selection of transmission paths table;
(3) locator determining at the down-hole coordinate position, because base station, router belongs to prior fixed point setting, the coordinate data of its each position is known, when the personnel in the pit who disposes locator when underworkings moves, can receive and close on each router and send at interval ICQ information simultaneously by setting-up time, the ICQ information packet of cycle emission contains the ID and the coordinate information of emission router, after locator receives these RI radio intelligence, the embedded microprocessor that includes will be according to these information and the numerical value of measuring the energy RRSI of each router radio signal, adopt following location algorithm, calculate the relative position of self:
This location algorithm principle is according under the specific environment, there is mathematical relationship between RRSI value between each node of network and the space length, self study by network, determine this mathematical relationship, locator is determined the relative position in its space according to mathematical relationship of setting up and the new RRSI value of measuring afterwards;
(4), each router is received the information of sending from locator, outwards transmit after adding self range information, after other router is received this information, judge that this information is to send or the next router sends from upper router, for the information that upper router sends, will not transmit; The information of sending for the next router continues outwards to transmit, and carries out successively, is finally received the coordinate information of locator by the base station, and by base station transmits to aboveground control computer.
2, method according to claim 1, it is characterized in that described locator, wireless router are made of microprocessor, ZigBee wireless transmission chip and external antenna, the base station is by TCP/IP or the communication of RS485 procotol brow-up position, the communication of IEEE802.15.4 procotol brow-down position.
CNB2006100976372A 2006-11-15 2006-11-15 A method for realizing real-time monitoring of the underground coal miners by ZigBee network CN100481797C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2006100976372A CN100481797C (en) 2006-11-15 2006-11-15 A method for realizing real-time monitoring of the underground coal miners by ZigBee network

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006100976372A CN100481797C (en) 2006-11-15 2006-11-15 A method for realizing real-time monitoring of the underground coal miners by ZigBee network

Publications (2)

Publication Number Publication Date
CN1953408A true CN1953408A (en) 2007-04-25
CN100481797C CN100481797C (en) 2009-04-22

Family

ID=38059542

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2006100976372A CN100481797C (en) 2006-11-15 2006-11-15 A method for realizing real-time monitoring of the underground coal miners by ZigBee network

Country Status (1)

Country Link
CN (1) CN100481797C (en)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7672876B2 (en) 2007-07-13 2010-03-02 Sunrise R&D Holdings, Llc System for shopping in a store
CN100596363C (en) * 2007-05-31 2010-03-31 北京泛亚创知科技发展有限公司 Distance-finding method between center node and equipment node in beacon wireless personal area network
US7734513B2 (en) 2007-07-13 2010-06-08 Sunrise R&D Holdings, Llc System of tracking the real time location of shoppers, associates, managers and vendors through a communication multi-network within a store
US7739157B2 (en) 2008-01-15 2010-06-15 Sunrise R&D Holdings, Llc Method of tracking the real time location of shoppers, associates, managers and vendors through a communication multi-network within a store
US7742952B2 (en) 2008-03-21 2010-06-22 Sunrise R&D Holdings, Llc Systems and methods of acquiring actual real-time shopper behavior data approximate to a moment of decision by a shopper
US7783527B2 (en) 2007-09-21 2010-08-24 Sunrise R&D Holdings, Llc Systems of influencing shoppers at the first moment of truth in a retail establishment
US7792710B2 (en) 2007-09-21 2010-09-07 Sunrise R&D Holdings, Llc Methods of influencing shoppers at the first moment of truth in a retail establishment
US7848964B2 (en) 2008-07-14 2010-12-07 Sunrise R&D Holdings, Llc Method for shopping in a store
CN101922310A (en) * 2010-06-18 2010-12-22 昆山诺金传感技术有限公司 Security monitoring and managing system of coal mine underground operators
EP2282450A1 (en) * 2009-07-13 2011-02-09 Tulecom Group S.L. Wireless communication apparatus for the interconnection of devices and the formation of networks based on the IEEE802.15.4/ZigBee standard.
US7917405B2 (en) 2008-07-14 2011-03-29 Sunrise R&D Holdings, Llc Method of direct-to-consumer reverse logistics
CN101187702B (en) * 2007-12-06 2011-03-30 上海大学 Downhole coal mine personnel real-time radio positioning method
CN102186243A (en) * 2011-05-23 2011-09-14 常熟市智胜信息技术有限公司 Underground personnel positioning method
CN102235177A (en) * 2010-04-21 2011-11-09 常熟市智胜信息技术有限公司 ZigBee-based wireless sensor network system for mine safety monitoring
CN102307386A (en) * 2011-08-31 2012-01-04 公安部第三研究所 Indoor positioning monitoring system and method based on Zigbee wireless network
CN101349744B (en) * 2008-06-27 2012-02-29 重庆智溢科技有限公司 Method and system for tracking and positioning downhole personnel based on Zigbee network platform
CN102497618A (en) * 2011-12-13 2012-06-13 方正国际软件有限公司 Frequency-modulated introduction system based on smart terminal, and frequency-modulated introduction method of the same
CN101795479B (en) * 2010-01-15 2012-12-05 东莞勤上光电股份有限公司 Wireless short-distance networking method
US8396755B2 (en) 2008-07-14 2013-03-12 Sunrise R&D Holdings, Llc Method of reclaiming products from a retail store
CN103024896A (en) * 2011-09-23 2013-04-03 李志海 System, method and device for wireless location
CN101359047B (en) * 2008-09-23 2013-07-17 西部矿业股份有限公司 Downhole wireless positioning method based on understanding
CN103517405A (en) * 2012-06-18 2014-01-15 高德软件有限公司 Network positioning method and system, mobile terminal and network-side apparatus
CN104092990A (en) * 2014-07-11 2014-10-08 西京学院 Underground personnel monitoring system of mobile handheld terminal
CN106572440A (en) * 2016-10-27 2017-04-19 连云港海智电子科技有限公司 Zigbee technology based customer table number positioning system and method of fast food restaurant
US10168417B2 (en) 2016-08-10 2019-01-01 General Electric Company Systems and methods for tracking location in industrial facilities

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ304151B6 (en) * 2012-10-09 2013-11-20 Ceské vysoké ucení technické v Praze - Fakulta elektrotechnická Circuit arrangement for integrated control and management in service networks of smart buildings

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8125970B2 (en) 2007-05-31 2012-02-28 Beijing Yudong Technology Development Ltd. Ranging method for measuring distance between a central node and an equipment node in a beacon wireless personal area network
CN100596363C (en) * 2007-05-31 2010-03-31 北京泛亚创知科技发展有限公司 Distance-finding method between center node and equipment node in beacon wireless personal area network
US7734513B2 (en) 2007-07-13 2010-06-08 Sunrise R&D Holdings, Llc System of tracking the real time location of shoppers, associates, managers and vendors through a communication multi-network within a store
US7672876B2 (en) 2007-07-13 2010-03-02 Sunrise R&D Holdings, Llc System for shopping in a store
US7783527B2 (en) 2007-09-21 2010-08-24 Sunrise R&D Holdings, Llc Systems of influencing shoppers at the first moment of truth in a retail establishment
US7792710B2 (en) 2007-09-21 2010-09-07 Sunrise R&D Holdings, Llc Methods of influencing shoppers at the first moment of truth in a retail establishment
US8600828B2 (en) 2007-09-21 2013-12-03 Sunrise R&D Holdings, Llc Methods of acquiring actual real-time shopper behavior data approximate to a moment of decision by a shopper
US8195519B2 (en) 2007-09-21 2012-06-05 Sunrise R&D Holdings, Llc Methods of acquiring actual real-time shopper behavior data approximate to a moment of decision by a shopper
CN101187702B (en) * 2007-12-06 2011-03-30 上海大学 Downhole coal mine personnel real-time radio positioning method
US7739157B2 (en) 2008-01-15 2010-06-15 Sunrise R&D Holdings, Llc Method of tracking the real time location of shoppers, associates, managers and vendors through a communication multi-network within a store
US7742952B2 (en) 2008-03-21 2010-06-22 Sunrise R&D Holdings, Llc Systems and methods of acquiring actual real-time shopper behavior data approximate to a moment of decision by a shopper
CN101349744B (en) * 2008-06-27 2012-02-29 重庆智溢科技有限公司 Method and system for tracking and positioning downhole personnel based on Zigbee network platform
US7848964B2 (en) 2008-07-14 2010-12-07 Sunrise R&D Holdings, Llc Method for shopping in a store
US8396755B2 (en) 2008-07-14 2013-03-12 Sunrise R&D Holdings, Llc Method of reclaiming products from a retail store
US7917405B2 (en) 2008-07-14 2011-03-29 Sunrise R&D Holdings, Llc Method of direct-to-consumer reverse logistics
CN101359047B (en) * 2008-09-23 2013-07-17 西部矿业股份有限公司 Downhole wireless positioning method based on understanding
EP2282450A1 (en) * 2009-07-13 2011-02-09 Tulecom Group S.L. Wireless communication apparatus for the interconnection of devices and the formation of networks based on the IEEE802.15.4/ZigBee standard.
CN101795479B (en) * 2010-01-15 2012-12-05 东莞勤上光电股份有限公司 Wireless short-distance networking method
CN102235177A (en) * 2010-04-21 2011-11-09 常熟市智胜信息技术有限公司 ZigBee-based wireless sensor network system for mine safety monitoring
CN101922310B (en) * 2010-06-18 2013-11-06 苏州中崟传感股份有限公司 Security monitoring and managing system of coal mine underground operators
CN101922310A (en) * 2010-06-18 2010-12-22 昆山诺金传感技术有限公司 Security monitoring and managing system of coal mine underground operators
CN102186243A (en) * 2011-05-23 2011-09-14 常熟市智胜信息技术有限公司 Underground personnel positioning method
CN102307386B (en) * 2011-08-31 2015-03-11 公安部第三研究所 Indoor positioning monitoring system and method based on Zigbee wireless network
CN102307386A (en) * 2011-08-31 2012-01-04 公安部第三研究所 Indoor positioning monitoring system and method based on Zigbee wireless network
CN103024896A (en) * 2011-09-23 2013-04-03 李志海 System, method and device for wireless location
CN102497618A (en) * 2011-12-13 2012-06-13 方正国际软件有限公司 Frequency-modulated introduction system based on smart terminal, and frequency-modulated introduction method of the same
CN103517405A (en) * 2012-06-18 2014-01-15 高德软件有限公司 Network positioning method and system, mobile terminal and network-side apparatus
CN104092990A (en) * 2014-07-11 2014-10-08 西京学院 Underground personnel monitoring system of mobile handheld terminal
US10168417B2 (en) 2016-08-10 2019-01-01 General Electric Company Systems and methods for tracking location in industrial facilities
CN106572440A (en) * 2016-10-27 2017-04-19 连云港海智电子科技有限公司 Zigbee technology based customer table number positioning system and method of fast food restaurant

Also Published As

Publication number Publication date
CN100481797C (en) 2009-04-22

Similar Documents

Publication Publication Date Title
Haxhibeqiri et al. LoRa indoor coverage and performance in an industrial environment: Case study
Dubois-Ferrière et al. TinyNode: a comprehensive platform for wireless sensor network applications
CN104361765B (en) Parking space detecting system based on magnetoresistive sensor and ZigBee
Niu et al. The design and evaluation of a wireless sensor network for mine safety monitoring
Lara et al. On real-time performance evaluation of volcano-monitoring systems with wireless sensor networks
CN101647243B (en) Method and apparatus of connectivity recovery in wireless network
CN104612682B (en) One kind is based on UWB coal-winning machines absolute position accurate calibration method and device
CN103887890B (en) Disaster area power grid state monitoring method
CN201741262U (en) Wireless mine monitoring system
CN101232417B (en) Embedded type wireless sensing network intelligent platform
CN103068036A (en) Auxiliary ap tag and positioning system using same
CN201526315U (en) Drilling parameter acquisition device using acoustic wave for transmission through drill rod
CN104237645B (en) A kind of transformer station direct current system state of insulation on-line monitoring system and method
CN101359047B (en) Downhole wireless positioning method based on understanding
Gao et al. Environmental monitoring system with wireless mesh network based on embedded system
CN103021154B (en) Wireless meter reading system based on Ad Hoc
CN106101999B (en) A kind of recognition methods of user trajectory and device
CN107018495B (en) A kind of indoor user Hierarchical Location method and system based on signaling data
CN103478963A (en) Intelligent coal mine safety monitoring helmet
CN202351671U (en) Remote integrated monitoring digital information system for urban inspection wells
CN106535114B (en) The localization method of terminal, system and high-speed rail network monitoring method, system in high-speed rail
CN102269014A (en) Coal mine down-hole fire monitoring system based on wireless sensor network
RU180206U1 (en) Telemetry device for collecting information and monitoring a remote object
CN201118872Y (en) A coal mine down-hole communication base station
CN201215494Y (en) Wireless detection system for temperature and humidity of granary

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090422

Termination date: 20111115