02-01-2013, 11:10 AM
Application Research of Embedded Web Technology in Traffic Monitoring System
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Abstract
the paper mainly discusses design of hardware &
software for embedded web server with Heterogeneous
network seamless connectivity and implement of key
technology. It contains transplantation of embedded Linux
operating system, design of embedded web server,
transplantation of database and implementing method of
main functions. Remote monitoring is realized to traffic
information collection, monitoring traffic conditions, traffic
control, information published and communication of traffic
data by using combining EWS technology with Internet.
The results indicate that the intelligent traffic control
technology based on embedded web technology can achieve
the integration of a wide range of information collection and
it breaks through the traditional traffic monitoring
technology for designing traffic monitoring system and
provides the advanced technology based on embedded Web
for designing modern traffic monitoring system.
INTRODUCTION
With rapid economic development in China,
transportation has increasingly become an extremely
important component in the national economy and daily
life. So it is very essential to build a modern intelligent
traffic control system in order to resolve the traffic
congestion of roads and reduce accidents. And video
monitoring and traffic information transmission in this
system plays an important role. Intelligent traffic for
solving urban traffic management has become the
people's consensus such as advanced and sophisticated
video surveillance system as an important component of
intelligent transportation for image acquisition, on-site
snapshot, after taking of evidence and other important
tasks. Monitoring systems are usually installed on the
expressway, traffic junctions, toll stations and other key
places according to the actual needs of current traffic
monitoring. All the information is integrated to the
monitoring center.
SYSTEM DESIGN
EWS system is composed of embedded web server
hardware & software system and traffic monitoring
system, as shown in Figure 2. The hardware mainly
consists of two main components: an embedded Web
server and bus controller. The bus controller is for region
of traffic monitoring to design, and each control point is
identified corresponding to the embedded WEB server
(EWS), and the hardware structure and software system
of EWS are determined according to the corresponding
control volume[3,4].
EWS Hardware System
EWS hardware system includes an embedded ARM
processor, FLASH, ROM, DRAM, Ethernet port, frontterminal
application system components and bus
controller, as shown in Figure 3.The processor is
Samsung S3C44B0X ARM7 that is suitable for quite
poor working environment, supports uCLinux operating
system, runs faster than 8-bit and 16-bit processor[11].
DETAILED DESIGN OF MONITORING SYSTEM
The decentralized monitoring and centralized
management are generally used in traffic monitoring
system. The entire system contains a monitoring center, a
number of scattered remote monitoring terminals and
telecom media.
The remote monitoring terminals include the video
transmission terminals and the data transmission
terminals[7].The video transmission terminal is generally
a infrared camera or monitor and the video signals from it
are compressed by the MJPE or JPEG through the multifunction
bus controller to form data frames that can be
transmitted in the network, then the data frames are
transferred into the EWS through the internal bus. The
data transmission Terminals are such as the electronic
police, radar detectors, vehicle detectors, variable speed
limit signs, variable information panels and etc. These
devices are responsible for data acquisition, data storage,
and data transferring through the multi-function bus
controller.
SYSTEM FUNCTION AND TESTING
The embedded Web traffic monitoring system is based
on embedded Web technology as the core. Meanwhile, it
is combined with traffic information acquisition, traffic
surveillance, traffic control, information publication and
other traffic control functions. Then the traffic data are
collected, stored, managed, transmitted, analyzed, and
displayed. The traffic managers or decision makers are
provided with these data for decision making and
management on the traffic situation. For example, when a
vehicle runs the red light, the electronic police system
detects the vehicle through the ground induction coil; its
detector is triggered, at the same time the signal
controller issues a "red light" signal to the electronic
police system.
CONCLUSION
The system adapts an embedded Web server
technology to implement data collection and video
monitoring through using modular structure and
heterogeneous network seamlessly connected. Therefore
the managers can perform the traffic management and
monitoring without the geographical and environmental
limitation and the public information services are also
provided. Intelligent traffic control system based on the
embedded Web technology is widely used along with the
development of the intelligent traffic.