> One, outline
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.
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 the extension:
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:
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 Zhonglian to regard the GPRS
migration data communication terminal which the news provides.
3rd, user registration: Conforms to the provincial level
environmental protection bureau's stipulation.
(3) product characteristic
The system uses AYG-83C 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, PCMCIA.
3rd, system theory transmission speed 171Kbps, actually
transmits speed 40Kbps.
4th, supports Windows95/98/200/XP, the LINUX operating system.
5th, support transparent data transmission and agreement
transformation.
6th, supports the VPN security function.
7th, the installment nimble, the easy to operate, is reliable.
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