> The environmental monitoring department took the
country environmental protection system the technical department, is
the environment supervisory work important foundation. Along
with the resident environmental awareness enhancement, more and more
many people start to care about locates the environment quality
quality, request environmental protection work 透明? The
higher authority department responsible for the work also needs the
quantity in a big way, the type are many, renews the quick
information. All all these, proposed for the environmental
monitoring department should cause the value question: How
establishes the usability strongly, the coverage is broad, the
flexible good environmental protection data acquisition system,
satisfies all quarters facing the environmental monitoring information
demand.
In the environmental protection system, frequently needs to
discharge the spot to the multitudinous pollution to carry on the
real-time monitor, the majority of monitors data needs the real-time
transmission to carry on processing to the administrative center rear
end server. Because test point dispersible, the distributed
scope is broad, moreover mostly establishes in an environment worse
area, through telephone line transmission data often wasted effort.
Carries on the data transmission through the GPRS wireless
network, becomes one of means of communication which the environmental
protection department chooses. The source of pollution monitor
equipment may the pollution data and the warning information which
gathers through the GPRS network promptly transmits to the
environmental protection monitor department, realizes to dumps
pollutants the unit or individual prompt management, may greatly
enhance the environmental protection department the working
efficiency.
First, project demand
Some province already had 16 cities the environmental
monitoring stations and various counties area inspection station
brings into line with the provincial level monitoring network, three
levels of above environmental monitoring stations altogether 102, the
monitor main object was industry "three wastes" discharges and the
government situation and the atmospheric environment, the water
environment, the noise environment and so on. Including:
Monitors 14 cities the air environment quality present
situations, 12 main river systems, 7 main lakes storehouses, 7
nearshore harbors and 16 cities tap water source water quality present
situation,9 cities noise pollution present situations, and through
method and so on composite index carry on the trend analysis, finally
draws the environment quality conclusion.
The province environmental protection data acquisition system is
discharges the source of pollution monitor system by the source of
pollution which the test point and the monitor center is composed.
This system may carry on the automatic sampling to the source of
pollution, carry on the on-line monitor to the main pollution factor;
Grasps the city source of pollution to discharge the situation
and the source of pollution discharges the total quantity, monitors
the data automatic transmission province environmental protection
monitor center; Carries on the data by the monitor center
computer to compile, the reorganization and the generalized analysis;
The monitor information passes on to the province environmental
protection bureau, carries on the surveillance management by the
province environmental protection bureau to the source of pollution.
At present, various sources of pollution discharge the test
point installment source of pollution monitor meter, carries on the
monitor to the source of pollution. The monitor center receives
the test point transmission the monitor information; And is
responsible to the monitor information carries on the classification,
screening and the generalized analysis. The province
environmental protection bureau achievement system decision-making
center, to from monitors the monitor information which the central
station obtains to carry on the analysis, the investigation and study,
promptly makes the management decision-making, increase management
dynamics.
At present, saves the environmental protection inspection
station mainly to use manual transcribing or the PSTN telephone line
transmission with each gathering between data communication.
When uses the telephone line transmission data, because each
time the digit dialing all needs to wait for, speed slow, moreover the
expense is also higher. At the same time, because each 监控?distribution scope broad, the quantity are many, is away from far, the
individual spot also is situated remotely, therefore must apply for
very many telephone lines, moreover some 监控?wire lines arrive
with difficulty.
GPRS has the speed to be quick, the working costs low
characteristic, its transmission speed may reach 171.2kb/s.
Compares with the wire communication way, uses the GPRS wireless
mailing address to appear extremely nimbly, it has the network nimbly,
the expansion is easy, the operating cost lowly throws, maintains, the
price simply compared to the higher merit therefore, at present was
considering uses the GPRS wireless transmission mode solution source
of pollution monitor data the real-time transmission question.
Second, plan merit
China moves the GPRS system to be possible to provide
the macrozonality the wireless IP connection. Constructs the
environmental protection information gathering transmission system in
the mobile communication company's GPRS service platform, the
realization environmental protection information gathering wireless
data transmission has may fully use the existing network, reduces the
construction cycle, reduces the construction cost the merit, moreover
the equipment setup convenient, the maintenance is simple. After
the comparative analysis, we choose the GPRS system which China moves
to take the environmental protection information gathering
transmission system the data communication platform.
The GPRS wireless environmental protection source of pollution
on-line supervisory system has the following characteristic:
1st, timeliness strong:
Compares with the short news service, because GPRS has the
real-time on-line characteristic, the system does not have when
extends, does not need the wheel to patrol may the synchronized
receive, process many/all test points each kind of data. May the
very good satisfied system logarithm according to gathering and the
transmission timely request.
2nd, may carry on the long-distance control to various test
points instrumentation equipment:
Also may realize through the GPRS bidirectional system to the
instrumentation equipment carries on the reverse control, for example:
The time adjusts, control function and so on condition report,
switch, and may carry on the system long-distance on-line promotion.
3rd, construction cost little low:
Because uses the GPRS male net platform, does not need to
construct the network, only needs the peaceful bring home to be
allowed, the construction cost is low;
4th, monitor area broad:
Constructs the environmental protection information gathering
transmission system request data communication cover scope to be
broad, expands accommodates unlimitedly, turns on the place
unlimitedly, can satisfy the mountainous area, the villages and towns
and the cross area turns on the demand. Because environmental
protection information gathering quantity multitudinous, distributes
in the entire province scope, the partial environmental protections
information gathering spot is located the remote area, moreover the
geographical position is dispersible.
5th, has good may expand the nature: Because the present
GSM/GPRS network has covered in the province the major part area, is
basic does not have the blind spot, may realize the wide range on-line
monitoring, satisfies the environmental protection information
gathering transmission system to cover the scope the request.
6th, system transmission capacity big:
The environmental protection central station must with each
environmental protection information gathering realization real-time
connection. Because an environmental protection information
gathering quantity is multitudinous, the system request can satisfy
the burst characteristics data transmission the need, but the GPRS
technology can satisfy the transmission burst characteristics data
well the need.
7th, data transmission rate dtr high:
Each environmental protection information gathering each time
data transmission quantity in 10Kbps. The GPRS network
transmission speed theoretically may reach 171.2kbit/s, at present the
GPRS actual data transmission speed about 40Kbps, versatilely
satisfies this system data transmission speed (>= 10Kbps) the demand.
8th, correspondence expense low:
Uses hires by the month costs the way, the operation cost is
low.
Third, solution introduction
Because the GPRS correspondence is based on the IP
address data packet communications dpc network, the monitor central
computer main engine disposition fixed IP address, each data
acquisition spot uses the GPRS module and this main engine carries on
the correspondence.
(1) system composition
1st, environmental protection information gathering
spot:
The scene 监控?through the data acquisition module
automatic gathering source of pollution information, is connected
through the RS232 connection and the GPRS transparent data
transmission terminal, sets through the GPRS transparent data
transmission terminal in inserts the type processor logarithm after to
carry on processing, the agreement seal transmits to the GSM network.
2nd, monitoring center:
The server application disposition fixed IP address, uses the
DDN special line which the province mobile communication company
provides, is connected with the GPRS network. Because the DDN
special line may provide a higher band width, when an environmental
protection information gathering quantity increases, the center does
not need to expand allows then to meet the need.
After the monitoring center RADIUS server accepts the data which
the GPRS network transmits first to carry on the AAA authentication,
rear-drive delivers the monitoring central computer main engine,
according to carries on the return to original state demonstration
through the system software logarithm, and carries on the data
processing.
 3rd, GPRS/GSM migration data transmission network:
The scene 监控?gathering data the logarithm according to
carries on decoding processing after the GSM network space connector
function module at the same time, transforms in the male net data
transfer form, moves the GPRS wireless data network through China to
carry on the transmission, finally transmits to the monitoring center
IP address.
(2) system plan
Each 监控?uses the GPRS transparent data
transmission terminal, through moves the GPRS network and the
monitoring center is connected. Various sources of pollution
data acquisition use mobile communication company unifies the STK
card, simultaneously monitors the center to carry on the registration
to each spot, preserves the correlation data in order to recognition
and maintenance processing. Various information gathering
movement supervisory system software, supports for 24 hours real-time
on-line, realizes information gathering to select 24 hours
transmissions gathering the environmental protection information data.
Every province environmental protection bureau authorization
information gathering may use this system:
1st, the environmental protection information gathering spot
must use the motion unified STK card, the user uses this card only to
be able to use in with the environmental protection station data
communication function.
2nd, the terminal device uses the GPRS migration data
communication terminal which the Xiamen space can the technical
limited company provide.
3rd, user registration: Conforms to the provincial level
environmental protection bureau's stipulation.
(3) product characteristic
The system uses YN2010 the series GPRS wireless
transparent data transmission terminal. Product GPRS network
which moves based on China, has the high performance, high reliable
and the antijamming ability is strong and so on the characteristic,
provides the standard RS232 connection to be possible directly with
connection and so on computer, RTU, PLC, GPS receiver, digital camera,
data terminal, the transmission speed to reach 171Kbps, has the
long-distance diagnosis, the test, the supervising and managing
function between, satisfies various professions dispatch or the
control center and the multitudinous far-end stands the data
acquisition and the control.
1st, supports 900/1,800/1900MHz three frequencies GSM/GPRS.
2nd, connection: RS232, RS485, TTL.
3rd, system theory transmission speed 171Kbps, actually
transmits speed 40Kbps.
4th, supports the Windows95/98/2000/XP/LINUX operating system.
5th, transparent data transmission: In YN2010EP-DTU inlays
the TCP/IP agreement, provides for user's data equipment transparently
transmits the channel;
6th, automatic digit dialing connection: YN2010EP-DTU may
dispose the electricity automatic digit dialing to access the net, the
connection network, simultaneously supports the user end to initiate
the order connection or long-distance awakens the connection;
7th, short information spare data channel: Is unable the
connection when the GPRS network may begin using the short note to
take the spare data-transmission channel;
8th, short information long-distance maintenance function;
9th, the real-time monitor network connection situation,
automatically falls the line to dial the function again;
10th, provides the host vice- IP and the dynamic domain name
analysis;
11th, the palpitation reporting time interval user may
establish;
12th, the data communication frame length user may establish;
13th, supports the VPN security function.
14th, the installment nimble, the easy to operate, is reliable.
(4) security measure
As a result of the environmental protection data
acquisition system particularity, this system needs the extremely high
system safety control and the stability. The safety control
mainly is prevented from the system inside and outside the broken link
which intends and has no intention, the network security protective
measure including the channel encryption, the letter source
encryption, registers the protection, the visit protection, turns on
the protection, the firewall and so on. Stable is refers to the
system to be able 7×24 the hour uninterrupted movement, even if
appears the hardware and the software breakdown, the system cannot
sever the movement. The data central passable male network has
used VPN to turn on moves the GPRS net, uses the VPN way cost
comparison to be low, the enterprise does not need to rent the special
line, but also may benefit the old use original VPN equipment, the
mobile termination needs to install has the VPN two hypothesized digit
dialings functions software. Through the VPN way, the customer
end in front of the connection application server, had to obtain the
encipherment protection after the Radius server authentication entire
data transfer process, the security quite has been high, but fully
safeguarded the speed and the network grade of service.
Moreover, the data central also may use APN to turn on the way,
rents the special line to turn on the motion company on the GGSN
equipment, this kind of cost high, the security high, stable is
reliable. Regarding the secure request extremely high system,
may consider turns on in special-purpose APN in the foundation adds on
VPN to turn on the way again the mix to turn on the way, further
enhances the system the security.
1st, VPN hypothesized special net pattern: In the
enterprise interior network disposes the VPN server, the mobile
termination increase has the VPN two hypothesized digit dialings
functions customer end software. Uses the VPN security
technology, the user through turns on the enterprise interior
hypothesized special network the way and Internet carries on isolates,
may carry on the encipherment protection to the entire data transfer
process, effectively avoids the illegal invasion.
2nd, with SIM card uniqueness, carries on the distinction
authorization to the user SIM card handset number, carries on in the
network side to the SIM card number and APN ties up decides, delimits
the user to be possible to turn on some system the scope, only has
belongs assigns the profession the SIM card serial number to be able
to visit special-purpose APN, the mobile termination and the data
central uses China to move the assignment special APN to carry on the
wireless network to turn on, the ordinary handset SIM card number is
unable to call special APN.
3rd, regarding the specific user, passable data central
assignment specific user ID and the password, other will not have the
data central assignment user ID and the password user is unable to
register enters the system, the system security further strengthens.
4th, data encryption: Carries on the encipherment
protection through VPN to entire data transfer process.
5th, the network turns on the safe appraisal mechanism:
Uses firewall software, the establishment network warning power
and the safe guard function, the safeguard system security.
Fourth, conclusion
Selects the wired method, rents static IP at present an
expense quite high approximately 800~1500 Yuan/month. Selects
the GPRS wireless method, the system current capacity expense at
present has hires by the month the system and according to the data
quantity two charges ways, calculates 0.03 Yuan K according to the
current capacity, but hires by the month system for 20 Yuan/months to
have 1,024 kBytes current capacity, may satisfy the province
environmental protection bureau at present the environmental
protection data acquisition system actual data quantity, estimated its
expense will be able gradually to reduce in the future.
Regarding user and so on environmental protection bureau said,
because the correspondence expense is lower, enjoyed the actual
benefit. Moreover, because turns on the equipment to be allowed
to move, when the environmental protection observation station and the
environmental protection information gathering spot moves the
equipment may and may continue along with it migration to use, may
protect the user original investment, suits to the environmental
protection gathering work characteristic.
Uses GPRS to construct the environmental protection data
acquisition system, not only can satisfy environmental protection
information gathering well the demand, moreover, does for the network
operation business mobile communication company also therefore will
obtain the service stable group users, along with the user quantity
increase, the mobile communication company's earning also along with
it increase, aroused the operation business enthusiasm, will conform
to the network construction and the network application
synchronization development request. |
