Automatic vehicle location (AVL) systems use GPS and other technologies to track vehicles in real-time. AVL determines a vehicle's exact position and relays it to a control center along with other data like status, heading and speed. There are two main types of AVL systems - passive tracking which stores location data for later use, and real-time tracking which combines GPS and cellular networks to transmit position continuously. AVL has many applications including fleet management, emergency services, and cargo/asset tracking.

1. By
CH. RAJU
O8Q61A0514

2. Introduction
 Automatic vehicle location (AVL) is a computer –based
vehicle tracking system
 The actual real –time position of each vehicle is
determined and relayed to a control center
 AVL systems include: computer -aided dispatch
software, mobile data terminals, emergency alarms,
and digital communications

3. About GPS:
 The GPS was specifically engineered so that at
least four of the 24 satellites would be
positioned on the horizon at all times.
GPS Satellite

4. What is AVL technology?
 AVL systems use satellite and land communications to
display each vehicle's
 location
 status
 heading
 speed on the computer's
screen.

5. Navigation Technologies
 Four Navigation Technologies. They are
1. Global Positioning System
2. Dead-Reckoning System
3. Signpost/Odometer Systems
4. Radio Navigation/Location

6. TRACKING SYSTEMS
 There are two types of tracking systems
 PASSIVE TRACKING
 REAL TIME TRACKING

7. PASSIVE TRACKING:
 It refers to stand-alone GPS Receivers, which stores
data for further process
 Passive Tracking systems are limited to vehicle
tracking only
 It stores the location, time, velocity and heading data

8. REAL TIME TRACKING:
 It is based on mobile stand-alone terminals which
combine GPS and GSM to transmit their position
GPS Receiver

9. WORKING OF A GPS BASED AVL:
It contains the following
GPS SATELLITES
RADIO SYSTEM
COMMUNICATION CENTER
DISPATCH SECTION
CUSTOMER ASSISTANCE UNIT

11. WORKING OF SIGNPOST BASED AVL:
It contains the following
Optical scanners
Magnetic strips
Beam emission
Short-range radio

12. SIGNPOST BASED AVL:

13. GROUND BASED RADIO AVL:
.The system can operate with one or more
antennas that broadcast a signal

14. DEAD-RECKONING:

15. AVL Benefits:

16. Uses Of AVL
 Vehicle location display in real-time.
 Recording of arrival and departure times (proof of
delivery etc).
 Monitoring of driving practices (speed).
 Alerts if vehicle leaves or enters a defined area

17. Applications Of AVL
 In Military
 Geo-Caching
 Track Anything
 In Cargo
In cargo

18. Conclusion
 By using GPS we track the location of the vehicle
 It is a cost effective and efficient technique
 It gives protection to the vehicles and also the accident
alerts