Cdma wireless remote monitoring safety solution of mine

Xiamen Caimore Communication Technology Co.,Ltd2 F, 37#, Wanghai Road, Software Park 2, Xiamen,China (361009)

Contact person: Cynthia Wang E-mail: [email protected]: caimoremodem Mobile phone: +86-13720875034

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Tel:+86 592 5901215 Web: www.caimore.com/emain.asp1

CDMA wireless remote monitoring safety solution of mine

Statement

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mailto:[email protected]



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Abstract: This article provides remote mine safety monitoring system design principles and

implementation of a network based on CDMA. It introduces the basics of CDMA technology, CDMA

networks method described in Remote Monitoring System of Mine Safety. The practical application,

obtain the desired results.

Key words: CDMA; DTU; Internet; Xiamen Caimore; mine;

Preface

Coal mine safety has become a national industrial safety a top priority. At present, coal production

safety accidents continue to occur, especially gas explosion accident occurred, to the people's lives

and property caused huge losses serious impact at home and abroad. CPC Central Committee and

the State Council attach great importance to coal mine safety work, have taken a series of major

initiatives, local governments have done a lot of work. How effectively curb the occurrence of major

accidents has become the most important mine safety aspect.

With the deepening of enterprise information, production information security has become an

important part of enterprise information brunt. The use of modern information technology,

construction safety production supervision and management information network system to the

production safety supervision and management work well.

Domestic coal industry, most companies have construction underway or production scheduling,

monitoring and control systems, such as the establishment of these systems currently play an

important role in achieving safe production process; but for various systems built in different periods,

using different techniques, each system can not be effectively integrated, so that safety production

monitor and control information can not be well integrated utilization. The safety production

monitor and control information in a timely and accurate delivery into the hands of the relevant

personnel at all levels, the lack of effective means.




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The system needs a central control room on the ground can be automated monitoring and

control of the whole mine unattended production process and equipment, and be able to convey

information to the mine-level leadership through the network, so that the leadership in the office at

any time to understand the production and safety information to achieve the unity of the whole

mine scheduling and unified management. Information needs of the system from the bottom up

progressively concentrated, with the Bureau of Mines, computer networking company's LAN coking

coal, real-time remote viewing. The control can focus on monitoring layer operation, it can also be

dispersed in the device control layer implementation. Each subsystem can be independently

self-contained, in accordance with the requirements of the mine-step configuration, thus achieving

the best solution.

To solve these problems, Xiamen Caimore developed mine safety CDMA wireless remote

monitoring system, mine production of effective supervision, to prevent and reduce the frequency of

accidents in production. The system has a reliable operation, data acquisition and real time,

effectively solve the various problems of other means of communication exists. Under the premise of

guaranteed data timeliness, accuracy, and reduce system operating costs to a minimum; at the same

time, the network communications link by a professional network operators (China Telecom) to

maintain, to avoid the user in the use of monitoring systems for , also you need to spend a lot of

energy to maintain communication lines and other problems; saving the user's initial capital

investment and operation and maintenance costs.

Introduction

1. SystemIntroduction

Mine Safety CDMA wireless remote monitoring system, relying on stable and reliable CDMA

network of China Telecom, the use of advanced military-grade mature CDMA wireless data terminal

for remote transmission equipment, standards-based TCP / IP protocol, to achieve a monitoring

system for wireless data acquisition, to not have cable transmission conditions of coal mine

production sites, provides a low cost, quick, efficient data transmission platform for safe production

of coal enterprises to provide a strong monitoring means.




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2. CDMA Introduction

CDMA is the abbreviation CDMA (Code Division Multiple Access), which is a branch of digital

technology - spread spectrum communication technology developed a new wireless

communications technology. CDMA technology is based on the principle of spread spectrum

technology, information and data with a certain signal bandwidth is about to be transmitted, and

modulation with a bandwidth much larger than the signal bandwidth, high-speed pseudo-random

code, so that the bandwidth of the original data signal is extended, and then the carrier modulation

and sent out. Receiver uses the same pseudo-random code, and the bandwidth of the received

signal for correlation processing, the original wideband signal into a narrowband signal that is

despread information data to achieve data transmission.

CDMA is a mobile communication and information services to solve a more perfect business,

which is based on data traffic billing, wide coverage, faster data transfer. The introduction of CDMA

for the wireless industry and enterprise users in offices provide the infrastructure platform for

promoting the development of mobile office applications and created favorable conditions.

Compared with the wired network, CDMA network has rented low-cost, mobile office, without

geographical constraints and so on. The emergence of CDMA users in the wireless business and

industry office provides a new choice.

With the emergence and fully operational next-generation CDMA mobile communications business,

wireless mobile data communications applications are increasingly widespread. High-speed data

transmission and always-on features, with charges by traffic charges ways to make CDMA

communication monitoring monitoring applications with unparalleled price advantage. CDMA

wireless communication network using mobile IP communications, either independently or as a

data transmission channel can also be used as an optical fiber has been set up, an adjunct to other

forms of digital radio.

Monitoring system components




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Mine monitoring system topology

1. System components

a．Safety Data Collection

Mine raw data collection (using RS485, RS232 interfaces directly collected concentrations of gas,

carbon monoxide, and hydrogen sulfide and other harmful gases and mining depth data);

Alarm threshold data set (the set warning threshold of harmful gases to be alert to judge);

The real-time data transfer to the upper level unit via remote wireless networks;

Real-time data received under the parent unit reported the mine and into the local real-time

database;

b. Safety Information Alarm

Alarm generation (mine raw data and alarm thresholds are compared, if it exceeds the value of an

alarm is generated);

Alarm data submitted to higher unit (the alarm data reported to the higher authorities); Step by

step to inform the Security responsible (according to the alarm policy to send alarms progressively

responsible mobile phone safety, and urge them to deal with as soon as possible). Notify the




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person responsible in the security, you can set alarms based on policies, grading timeshare inform

the Security responsible. When several alarms occur at the same time according to the setting of

the system can automatically select the transmission priority, such as priority alarms occur

simultaneously transmit gas and hydrogen sulfide gas alarms).

c. Safety Information Analysis Statistics

Security information system regularly summary, statistics, and output various reports.

d. Basic management

Information sources management (the original data and alarm threshold data for configuration

and management);

Alarm Policy Management (configuration data security alarm policies, such as notification and

other security persons responsible for order and time);

Data management (database backup, restore, and other functions);

2. Features

a. Keeping Online: CDMA wireless data terminal can automatically be attached to a boot on the

CDMA network, and establish a communication link with your data center, user data devices send

and receive data at any time, with real-time high;

b. Traffic accounting: CDMA wireless data terminal, according to the number of receive and send

data packets to collect fees, no transfer of data traffic without fee；

c. High-speed transmission: the fastest transmission speed CDMA network will reach 230.4kbps,

the rate depends on the level of mobile operator's network settings, according to China Mobile's

network, the current can provide stable data transmission of 120 ~ 140Kbps；

d. Networking is simple, fast, and flexible: CDMA wireless data terminal system can be built

anywhere via Internet network covering the whole of China's virtual private network for mobile

data communications for medium and small users with access to convenient, saving access

investment;

e. Communication link by professional operators Maintenance: Due to China Telecom's CDMA data

services, and therefore also responsible for maintaining the link by China Telecom, eliminating the




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trouble of maintaining a communication link;

f. Lightning and static: As a result of China Telecom's CDMA data services, so without affecting the

Internet, CDMA wireless data terminal transmit power is very small, the antenna is very short, and

without elevated overcome the cable transmission and radio transmission cited by lightning and

bad equipment easy to produce static electricity cause a dangerous disadvantage.

3. Functions

（1）The system has functions are: monitoring of gas, wind velocity, negative pressure,temperature,

carbon monoxide, feed and throttle switch and other environmentalparameters, you can monitor

the coal bunker coal level, water level in the warehouse and the main electrical and

mechanical equipment and other production parameters start andstop; monitoring voltage, current,

power and other electrical parameters; mechanical and electrical equipment

running protection parameters.

（2）Show more technological process simulation diagram, monitoring curve, tables and text on

mating larger area.

①The system generates and Operation；

②Measuring point generation and operation；

③Process simulation graphic display；

④Each measuring point data table shows；

⑤Displaying all kinds parameters of real-time analog form uphole & downhole, histogram, curve；

⑥ Displaying the start/stop time & Live value of switching from the major equipment of uphole

& downhole；

⑦ Displaying live value and the cumulative value of the accumulated amount of coal production

etc；

⑧In addition to form various types of alarm display, as well as voice signals；

⑨Clock and date display；

⑩System-related equipment and software operation trace shows。

（3）Systems can be configured to display that can display dynamic and static simulation graphics,

data tables, historical curve, hierarchical display excavation plan, measuring point configuration,




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real-time data display. Real-time preparation of mine mine safety information or tips can also be

controlled via the display host.

（4）Very friendly man-machine interface system, all displayed and printed as long as there are

operators with simple mouse clicks, anyone can easy to use, even if occasionally erroneous

operation will not affect the normal operation of the system. In order to ensure that the system

configuration information is not destroyed, specifically define the operating authority for the

system administrator, ordinary operators and configure the appropriate password password, only

the password is correct password to enter the system to operate within the operational purview.

（5）All parameters are detected in the system, on / off information and accumulated amount

accumulated, stored, and continuously maintained year (System Software Save every three

minutes), if special circumstances can be stored for a longer time, these data can be used at any

time form , displayed in the form of two-dimensional curves, you can print saved. Important device

users to adjust the analog or device-OFF information and storage time.

（6）The system has a simple drawing tools. All dynamic and static diagram can be drawn by the

mine operator general (when the drawing does not affect the host real-time monitoring function).

（7）The system has a list of display. Rendering and Displays include location, name, unit, alarm

threshold, power threshold, monitoring, maximum, average, minimum, power off command, the

power supply status, limit alarm, power failure alarm logic discrepancies, sensor failure, blockade

and unlocking. Switching display content including location, name, start / stop time, status, working

time, number of stops open, sensor status, locking and unlocking the like. The cumulative amount

of display content including location, name, unit, total value and so on.

（8）System with analog real-time curve and the historical curve display. Show maximum, average

minimum curve on the same coordinate with different colors. On one screen, displaying six analog

curve, and set time scale can show the corresponding time scale analog.

（9）System with histogram display. Can directly reflect the availability to start / stop times, sensor

status, locking and unlocking, and set time scale.

（10）System with analog animated display. Can image, intuitive, fully reflect the safety situation.

Click the device icon to display information about the contents of the device, including the process




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simulation map, the corresponding device-OFF, etc. corresponding analog values and curves.

(11) easily generate various forms by the users themselves, various types of data required for

printing tables, graphs and curves.

（12）All kinds of alarm information processing, and storage and real-time alarm. When the sensor

values overrun sound and light alarm, and monitoring host of the corresponding entry to transform

the way the background color and flashing to alert the user to issue specific equipment and

installation location of the alarm signal.

（13）System with lightning function, coupled with optical isolation interface and the sub-station;

in order to be sure that specializes in monitoring the main transmission cable connecting the

host-side configuration of the French production of surge arresters.

4．System Design Principles

●According to user's requirements；

●According to the requirements of the coal industry and the new standard GB3836-2006 "Coal

Mine Safety Regulations" provides to the selection;

● advanced technology, mature, functional and practical, to ensure reliable;

● combination of convenience, good scalability. After the system can be extended to allow

sufficient room for system upgrades to facilitate;

● openness and good compatibility, to achieve system software and hardware connections;

between system fully open, mutual capacitance is high;

● Extended functional diversity, the system through the online information exchange, monitoring,

control and management;

● optimize device function to achieve cost-effectively, reduce maintenance and management

personnel;

● Good human-machine interface, easy operation and management, data accuracy, quick




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response and easy operation.

System monitoring indicators

Mine Safety remote monitoring wireless network system is a collection of electronic technology,

network communications, sensor technology, data acquisition, signal processing, information

management and software engineering multitasking, multi-level, multi-technology in an integrated

system. Mine Safety remote monitoring wireless network system from the ground control center

station, CDMA wireless data terminal, various underground sub-stations, underground

explosion-proof and intrinsically safe multi-channel power, remote breaker, various mine sensors and

mine mechanical and electrical control equipment , and production monitoring software. The

composition of the entire system topology.

A communication server responsible for achieving industry data communication protocols, data

forwarding agents, communications equipment condition monitoring functions;

B monitoring center server for data analysis, storage, anti-control and other functions;

C database server for data storage, backup;

D WEB server real-time monitoring, data management, business management and other functions.

When the communication server implementation, the monitoring center server, database server,

WEB server can be installed on a single server, it can be installed in different servers. If the industry

customer terminal end of the IP binding, you need to install the RADIUS server for authentication

and IP AAA system binding functions.

Recommended by provincial monitoring center APN Line access to Telecom's CDMA network, this

way safe, stable and reliable. Monitoring center connected to each other at all levels of a VPN.

Each monitoring point use with CDMA terminal, through the telecommunications network with the

monitoring center.

V、CDMA data transmission terminal




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CDMA data transmission terminal realization monitoring center master station and monitoring

communication terminal. The system uses CM6550P CDMA DTU. The DTU functions and features are

as follows:

Wireless parameters

1, support the IS-95 A / B and CDMA2000 1xRTT wireless network

2, supports 13K QCELP audio codec

3, support for data, voice, SMS and fax

Hardware System

1, CPU: ARM9 industrial-grade high-performance embedded processors, 200MPS, MMU, 16KB

Dcache, 16KB Icache

2, FLASH: 8MB, can be expanded to 32MB

3, SDRAM: 64MB, expandable to 256MB

4, Interface：

An RS232 serial port. (If necessary, can support RS422 / RS485), serial port speed 110 ~

230400bits / s

LEDs: a power, communications and online indicator.

Antenna Interface: standard SMA female antenna interfaces, the characteristic impedance of 50

ohms.




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UIM card interface: 3V / 5V standard user card interface putt.

Power Interface: standard 3-pin power jack.

Voice interface: standard headphone microphone interface.

Powered by:

External power supply: DC 9V 500mA

Wide voltage power supply: DC 5-35V

Communications Current: 350mA

Standby Current: 35mA

1, size

Dimensions: 92.7x61.3x23 mm (not including antenna and fixed parts)

2. Other parameters:

Operating ambient temperature -25 ~ + 65ºC

Storage temperature -40 ~ + 85ºC

95% relative humidity (non-condensing)

Functions

1. Intelligent anti dropped support of online testing, online maintenance of automatic redial

dropped calls, to ensure that equipment is always online.

2. Support RSA, RC4 encryption algorithm

3. Support virtual duty VWM (Virtual Man Watch) function to ensure stable and reliable

system

4. Support for virtual private network data (APN)

5. Transparent data transmission and protocol conversion, support multiple operating

modes

6. To support the data center dynamic domain name and IP address access

7. supports dual data center backup

8. Support multiple data centers

9. Support SMS, voice, data and other wake-up mode and network connection timeout.

10. Support SMS backup and alarms.




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11. multiple hardware and software watchdog

12. The packet transmission status reports.

13. The standard AT command interface

14 can be used as an ordinary dial-up MODEM

15. Support telnet function.

16. Support remote configuration, remote control

17. serial software upgrade

18. supports LINUX and WINDOWS operating systems

19. Total power consumption of less than 3W

20. improve the CDMA network that appears in the fake dial, dropped automatically restart,

remote wake-up function;

21. Support remote control and dynamic DNS;

22. At the same time more embedded system requirements, providing a built-in module

(without housing, can be connected directly via pin and embedded systems);

23. The double watchdog as well as hardware and software, in the DTU does not work, can

automatically power reset.

VI. monitoring indicators details

1、Site acquisition and transmission

Site acquisition stations connected by a second instrument sensor RS-232 communication

port and CDMA wireless data terminal through each CDMA wireless data terminal mount a

China Telecom data SIM card. To prevent gas and coal dust underground fires and other

accidents danger to personal safety and equipment, in the underground mining area of

� �each working face, driving the first and major roadways, electrical and mechanical

caverns, etc. set up gas, temperature, carbon monoxide, wind speed, and other negative

environmental monitoring sensor provided at the throttle flap switch on the situation of

underground ventilation facilities for monitoring the environment, and the health of fans

and other electrical equipment monitoring and control, sub-stations will transmit the




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information to monitor ground central station. When the gas gauge and other parameters

(which can be set according to the specific circumstances of their own power, complex

power value) for real-time power of the relevant equipment. The system will make full use of

existing coal mines sensor and technical resources, and ensure that all sensors standard

signal (frequency 200-1000Hz acquisition of part manufacturers sensor output 4-20mA, can

use the "Signal Converter" to convert 200-1000Hz signal) in the access system to work

properly.

Underground sub-stations and sensors installed in the underground has coal dust, methane,

carbon monoxide and other dangerous gases in the environment, a variety of coal mine

safety, production and processing for real-time monitoring and timely production safety

parameters of the terminal via a CDMA wireless data transmission central station to the

ground. A variety of data from the sub-station and the central station processing, and

according to the requirements of direct and audible alarm and power control signals.

Ground central station via CDMA wireless data terminal using CDMA network links and

underground sub-station communication. Through the system can be accurate and

comprehensive understanding of the situation and mine safety production, to achieve the

disasters of the early prediction and forecasting, and timely manner automatically.

Production scheduling can grasp the operation of downhole equipment accurately directs

production.

2. Monitoring center

Mine safety monitoring center remote monitoring wireless network system for terrestrial

network (public network fixed or mobile IP network fixed IP) 2 computer: monitoring the

host and slave, when a host fails, the host immediately instead of auxiliary machines to

monitor, computer via the communication interface for data communication continuously

with each sub-stations, sub-stations and measuring points can be distributed anywhere on

the ground or underground, sub-station signal acquisition of the measuring point sensors,

connected through CDMA wireless data terminal and a communication interface to the host

transfer data, while sub-station and kept for the connected sensors patrol for data




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pre-processing, display, or as needed to control the output. Host system continuously to the

received data for each sub-station measuring point real-time processing, display and save

regularly.

VII、Telecom Line APN transmission

According to the special requirements of enterprise network security, Xiamen Caimore

Communication Technology Co., Ltd. is designed based on CDMA network data transmission

scheme, using a variety of security measures, including:

．Access via a 2M line telecommunications company CDMA network, using the Internet

between the parties private IP address of the router WAN connection between the GGSN

and the Mobile Internet routers GRE tunnel.

．For customers to assign dedicated APN, ordinary users can not apply for the APN. SIM cards

for CDMA private network only subscribe to the dedicated APN, limit the use of other APN.

．Customers can self a RADIUS server and DHCP server, GGSN to provide Caller ID to the

RADIUS server the user, using the calling number and combination of user account

authentication; a static IP address within the enterprise authenticated users are assigned by

the DHCP server.

．End encryption: use between the mobile terminal and server platforms-end encryption, to

avoid transmission of information throughout the process may leak.

．Both sides use a firewall to isolate and IP address and port filtering on the firewall.

IX.Telecom Business Process

CDMA private network system of the terminal server platform Internet logon process:

1) The user sends CDMA login request that includes telecommunications companies in CDMA

special net system specifically assigned private network APN;

2) Upon request of the APN, SGSN issued to the DNS server queries, locate the enterprise server

platform connected GGSN, and the GTP tunneling of user requests to the GGSN;

3) GGSN user authentication information (including phone number, user accounts, passwords, etc.)




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through a dedicated line to the Radius authentication;

4) Radius authentication server to see the phone number and other authentication information,

confirmation is sent to the user's legitimate request, to the DHCP server requesting allocation of

user addresses;

5) Radius authentication by Radius confirmation message is sent to the GGSN carries user's

address;

6) You get the IP address, you can carry a packet of information inquiry system CDMA private

network and business processing platform for a visit.

VV、Safety solution

Class: Secure network access layer

The use of telecommunications company distributes specialized APN for wireless network access;

Assign specific phone numbers: a mobile GSM phone caller number switch generation has been

encrypted, experienced hackers is very difficult to fake phone number.

Telecom network side HLR NE to phone number and APN made binding, is the industry's only

mobile phone number to access the private APN. Hackers took the CDMA terminal other phone

number can not call a special APN.

Class 2：Secure terminal certification

Data centers can CDMA terminal is assigned to each unique user ID and password, even if hackers

forge switches senior legitimate phone number, but the data center allocated to GPRS terminal

user ID and password is not, still can not set up a call center and data, and data center can

periodically ordered all meter data collection point user ID and password to get rid of.

Class 3：Secure firewall filtering

Access via a physical firewall settings

Class 4：Security applications

Business data is encrypted before transmission compression, to protect data during transmission




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security. Application system provides a powerful hierarchical rights management, to protect data in

the course of security.

X: Conclusion

In summary, the mine safety remote monitoring wireless network system is a medium to large

mines wireless network, computer monitoring and dispatching system, the system software to

monitor trends closely follow the development of system software, friendly interface, powerful

graphics capabilities, in show mine production system dynamics simulation chart on the big screen,

to help mine leaders and dispatchers understanding of the main production unit of equipment and

operating environment parameters, timely scheduling production, to prevent accidents, safety in

production. In large and medium mines and factories have good promotion prospects.


Devices & Hardware

Cdma wireless remote monitoring safety solution of mine