AUTOMATIC VEHICLE LOCATOR USING GPS TECHNOLOGY

JAGRITI SHARMA NITH

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?

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.

Components of AVL systems1)

• Radio Receiver

2)• GPS Receiver

3)• GPS Modem

4)• Antenna

5)• GPS Base Station

6)• Wireless Communication

7)• GPS Tracking Software

8)• Data Stream Processing Servers

What is GPS?The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites.

NAVSTAR, the official U.S. Department of Defense name for GPS

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.

Working of Automatic Vehicle Locator

Working of AVL system1) 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.

GPS Satellite GPS Receiver

Radio System GPS Antenna

Mapping Maps allow a tangible and understandable view of a vehicle’s location.

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.

Conclusion

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

References http://electronics.howstuffworks.com/gadget

s/travel/gps4.htm

www.eso.org

www.pocketgpsworld.com

www.vehiclelocationsystem.com

www.seminar-topics.in/Mechanical/Automatic-Vehicle-Locator

www.gpstracker.ph/tech

THANK YOU