> The recent years, the our country highway
constructed the development was rapid, has completed the our country
first highway since 1988, at present the our country highway total
course approached 20,000 kilometers, is only inferior to US, leaps to
the second in the world. The highway development has had the
more and more important influence to the national economy.
The weather condition monitoring is a highway scientific
operation important basis, the rain, the snow, the fog, the snow, ices
up and so on the situation all has the direct influence to the highway
operation. Bad visibility posed the serious threat to the
traffic safety. Stipulated according to Ministry of Public
Security, when the visibility is smaller than 50 meters, the
department concerned may adopt partial or completely seals up the
highway the traffic control measure. The highway had not
achieved when closure weather condition, the foggy day travel on the
highway vehicles according to the visibility difference, must take the
different travel measure, safeguards the traffic safety. In
addition, the road surface condition monitor also has the important
influence to the high tube department's science direction and the
management.
In view of the highway meteorology environmental monitoring
development direction, began to develop a set to suit our country
highway meteorology environmental monitoring the real-time monitor
system imperative. This system can the real-time monitor highway
weather condition, but automatically collects the meteorological
information, main monitor essential factor the and so on highway
temperature, humidity, precipitation, wind direction, wind speed,
visibility, road surface temperature, pavement behavior, road surface
ponding thickness change situation, promptly monitors the data on to
pass to the highway monitor center, automatically carries on
processing and on is prompt passes to the monitoring center, for
traffic control system reference, in order to promptly proposes the
best monitoring plan according to the weather condition.
System characteristic:
The highway automatic meteorology monitor system is suitable for
the highway management system management system, can provide the most
accurate reliable highway traffic environment meteorological data for
the highway traffic department, thus the instruction traffic
department makes the corresponding decision-making. This system
is one kind of high intelligent automatic detection meteorology
system, is suitable to each kind of bad open country environment, but
nobody value defends, has the entire automatic meteorological data
gathering, the memory, processing and the transmission function.
Remarkable characteristic:
1st, the system uses high modular, the intellectualized design,
may process satisfies from simply to the complex need, may use for to
carry on wide range the long-distance monitoring;
2nd, system gathering is through inserts the type gathering
analog channel (AI) and the digital channel (DI) in most greatly may
achieve 96, the expansion method is the use together together I/O
module through the extender board, by main line form connection.
Provides the sufficient intelligent sensor to turn on the port,
may massively match meets various types the intelligent sensor.
3rd, inserts the type data acquisition core to use American
Motorola Corporation powerpc32 the position CPU basic frequency to
reach 66MHz. Uses inserts the type real-time Linux operating
system, supports the user to carry on two times of developments,
provides I/O equipment API.
4th, the department uniform allocation meets the import
visibility meter and the road surface condition sensor, has the
response keenly, gathering precision high, is easy to install, exempts
characteristic for a long time and so on maintenance.
5th, the data storage uses the electronic hard disk (DOC) the
way, but also the different request may save the expansion.
6th, support many kinds of (Internet, telephone, GPRS, GPS and
so on) long-distance communication way and agreement. The
fault-tolerant ability is strong, arise suddenly the breakdown
regarding the external interference or the sensor to be allowed
automatically to correct error.
System composition
This system by meteorological data gathering and the
communication system, the sensor and the center control system three
main parts is composed.
Inserts the type data acquisition is the system key are partial,
it by CPU, the simulation survey channel, the digital survey channel,
intelligent installment and so on communication mouth, data-carrier
storage, ethernet connection, power source, anti-radar protection is
composed. This system can the accurate gathering data and on
prompt passes on, provides the intelligence to judge whether reports
to the police, and on is initiative notifies the police information.
It may support Ethernet, PSTN wired and GSM/GPRS wireless and so
on each mailing address, effectively has solved the equipment setup
region problem, enhanced the network flexibility.
The sensor mainly includes the visibility sensor, the rainfall
sensor, the ultrasonic wave wind direction wind speed sensor, the warm
humidity sensor, the road surface sensor and so on. Sensor
through simulation gathering channel, digital gathering channel, 485
or way and data acquisition connection and so on 232 serial ports.
Suits the visibility meter which the highway monitors to be
possible the precision measuring visibility, has the difference
rainfall amount and a fog function; The road surface sensor all
surveys part all contains inside a hard vessel, it provides the survey
content includes: The surface temperature survey part (road
surface temperature, also has two to survey below ground temperature
to poke head in), to ice up the temperature, the state of roads
(dryly, moist, wet æ³? frozen is wet æ³? ices up, snow), salt
content survey, road surface water film thickness.
The central station may select configuration software, also may
carry on according to the user request has custom-made. The
convenience hands over the tube department to carry on the monitor in
the control center.
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