Automatic Vehicle Locator

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AUTOMATIC VEHICLE LOCATOR USING GPS TECHNOLOGY
JAGRITI SHARMA NIT
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A few questions

• Is your car or a vehicle stolen and is not
  visible among the several cars present?
• Do you want to know the arrival of the bus for
  which you are waiting?
• Are you going alone in a vehicle and your parents
  want to track your movements because they are
  worried about you?
• Does your cargo consists of costly load and you
  want to protect them?
• Do you want to keep track of the little playing
  kids about where they are?

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The Solution
Automatic Vehicle Locator (AVL)

• What is AVL ?
• An automatic vehicle locator (AVL) is a device
  that makes use of the Global Positioning System
  (GPS) and enables to remotely track the location
  of a vehicle. It is an important tool which
  identifies a vehicle with regard to its
  geographic position, speed and heading.

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Components of AVL systems
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What is GPS?
NAVSTAR, the official U.S. Department of Defense
name for GPS
The Global Positioning System (GPS) is a
satellite-based navigation system made up of a
network of 24 satellites.
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How GPS works?
Triangulation Collecting of signals
from three or more satellites in carefully
monitored orbit from which the receiver computes
its own spatial relationship to each satellite to
determine its position.
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Working of Automatic Vehicle Locator
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Working of AVL system
1) The satellites are synchronized to emit
encoded navigational information (exact
positioning and exact time). 2) Any vehicle
equipped with a GPS receiver will intercept these
transmissions.
3) Using a simple mathematical formula derived
from triangulation, the receiver is able to
calculate its own longitude, latitude, velocity
and even altitude. 4) Then this information is
transmitted to a central dispatch center.
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GPS Receiver
GPS Satellite
Radio System
GPS Antenna
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Mapping
Maps allow a tangible and understandable view of
a vehicles location.
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Flaws in the system

• Ionosphere and troposphere delays - The satellite
  signal slows as it passes through the atmosphere.
• Signal multipath - The GPS signal is reflected
  off objects such as tall buildings before it
  reaches the receiver, thus increasing the travel
  time of the signal.
• Receiver clock errors - A receiver's built-in
  clock is not as accurate as the atomic clocks
  onboard the GPS satellites.
• Orbital errors - These are inaccuracies of the
  satellite's reported location.
• Number of satellites visible - The more
  satellites a GPS receiver can "see, the better
  the accuracy.

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Conclusion
Today's GPS receivers are extremely accurate.
They provide a worst case accuracy of 20 meters .
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References

• http//electronics.howstuffworks.com/gadgets/trave
  l/gps4.htm
• www.eso.org
• www.pocketgpsworld.com
• www.vehiclelocationsystem.com
• www.seminar-topics.in/Mechanical/Automatic-Vehicle
  -Locator
• www.gpstracker.ph/tech

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THANK YOU