22-06-2012, 01:54 PM
Design of Vehicle positioning System Based on ARM
[attachment=25071]
INTRODUCTION
Intelligent Transportation System is a crucial part of
China’s information construction. With the increasing city
holdings of cars, there are more and more traffic jams, so requirements
are that Intelligent Transportation needs more improvement.
The key technology Of Intelligent Transportation
is Vehicle positioning System, while the key of which is positioning
System. Nowadays the most widely used positioning
system is the Global Positioning System of America (GPS),
which is a system consisting 24 satellites whose searching area
embrace the globe. It can ensure that more than 4 satellites will
be observed at one time, no matter what time it is or where you
are, thus making sure that they can collect the longitude and
latitude of the view point, and furthermore realizing the function
of navigation, positioning, and time service.
SOFTWARE DESIGN
When using GPS to position, each satellite will send to the
receiving terminal three key messages: Satellite number,
satellite position, and time. The receiving terminal store and
use the received information, which is also used to fix the time
on the GPS receiver. By comparing the difference of the time
when each satellite signal is received and the time when the
satellite is sent, The GPS receiver calculate the distance from
each satellite to the receiver. When the receiver can contact
enough satellites, it can use trigonometric formulas to calculate
the location of the receiver. Three satellites can be able to
operate 2D positioning (longitude and latitude), while four or
more can be able to operate 3D positioning (longitude, latitude,
and height). The key indicator of positioning is the accuracy.
The horizontal position accuracy of most Civilian GPS
receivers is about 5 to 10m. Using differential technique, cmlevel
even mm-level positioning accuracy can be achieved.
CONCLUSION
Taking ARM as platform, and GPS and GSM as wireless
data communication platform, Vehicle Positioning System is
small, stable and reliable, with small delay, which can
effectively overcome the past disadvantages of poor real-time
and high operating costs existed in the system. Vehicle
positioning system is trying to achieve complexion of
positioning technology, integration of positioning systems, and
network of location-based services in the form of the current
Client / Serve. It is believed that the system will have broad
application prospects.
[attachment=25071]
INTRODUCTION
Intelligent Transportation System is a crucial part of
China’s information construction. With the increasing city
holdings of cars, there are more and more traffic jams, so requirements
are that Intelligent Transportation needs more improvement.
The key technology Of Intelligent Transportation
is Vehicle positioning System, while the key of which is positioning
System. Nowadays the most widely used positioning
system is the Global Positioning System of America (GPS),
which is a system consisting 24 satellites whose searching area
embrace the globe. It can ensure that more than 4 satellites will
be observed at one time, no matter what time it is or where you
are, thus making sure that they can collect the longitude and
latitude of the view point, and furthermore realizing the function
of navigation, positioning, and time service.
SOFTWARE DESIGN
When using GPS to position, each satellite will send to the
receiving terminal three key messages: Satellite number,
satellite position, and time. The receiving terminal store and
use the received information, which is also used to fix the time
on the GPS receiver. By comparing the difference of the time
when each satellite signal is received and the time when the
satellite is sent, The GPS receiver calculate the distance from
each satellite to the receiver. When the receiver can contact
enough satellites, it can use trigonometric formulas to calculate
the location of the receiver. Three satellites can be able to
operate 2D positioning (longitude and latitude), while four or
more can be able to operate 3D positioning (longitude, latitude,
and height). The key indicator of positioning is the accuracy.
The horizontal position accuracy of most Civilian GPS
receivers is about 5 to 10m. Using differential technique, cmlevel
even mm-level positioning accuracy can be achieved.
CONCLUSION
Taking ARM as platform, and GPS and GSM as wireless
data communication platform, Vehicle Positioning System is
small, stable and reliable, with small delay, which can
effectively overcome the past disadvantages of poor real-time
and high operating costs existed in the system. Vehicle
positioning system is trying to achieve complexion of
positioning technology, integration of positioning systems, and
network of location-based services in the form of the current
Client / Serve. It is believed that the system will have broad
application prospects.