The document discusses ADS-B technology and how it can improve air traffic surveillance when combined with GAGAN, India's satellite-based augmentation system. ADS-B uses GPS to broadcast flight information like location and speed to nearby aircraft and ground stations every second, providing more real-time awareness than radar which has a 12 second delay. When paired with GAGAN, ADS-B with GAGAN will give pilots and air traffic controllers more accurate location data to safely manage airspace. This could have prevented past mid-air collisions in India, like the 1966 crash that killed 349 people due to lack of information in dense traffic. The document argues for implementing ADS-B with GAGAN to improve aviation safety as air travel

1. ADS-B Technology With GPS Aided Geo
Augmented Navigation
Tanmay Senapati, Mahesh Ramachandran and Shivam Sharma
Department of Electronics and Communication
SRM University, Chennai, Tamil Nadu

2. Presentation Summary
● RADAR BASED SURVEILLANCE
● ADS-B TECHNOLOGY
● APPLICATIONS OF ADS-B
● GAGAN
● ADS-B WITH GAGAN
● 1966 CHARKHI DADRI AIR COLLISION

3. RADAR-BASED SURVEILLANCE
● Secondary Radar based surveillance is
currently being used for air traffic
surveillance.
● The ATC directs the aircraft through the
currently congested airspace by sending
the information to the controllers and
then the controllers send their position
by using the transponder.
● The time between the signal that is sent
and received is approximately 12 sec.
Hence it leads to loss in information.

4. ADS-B TECHNOLOGY
● Automatic Dependent Surveillance-
Broadcast(ADS-B) can be divided into two
parts ADS-B OUT and ADS-B IN.
● A flights position is found out using the
Global Navigation Satellite System(GNSS)
and by using the ADS-B transmitters.
● The information regarding flights position,
velocity is sent to all the nearby aircrafts
and the ADS-B ground stations.
● This information is sent every second
which leads to real time awareness between
the pilots.

5. APPLICATIONS OF ADS-B
The applications of ADS-B includes:-
1. It provides more situational awareness to the
pilots to manage the airspace around them.
2. It can also enhance situation awareness on
approach, allowing continued approaches which
can ease the air congestion in the airspace.
3. ADS-B will also help in reducing the air incidents
across the world as more information lies in the
hands of pilots.

6. GAGAN
● GAGAN is satellite based Indian
augmentation and navigation system
developed by Airport Authority of India(AAI)
and Indian Space Research
Organisation(ISRO).
● It consists of 15 Indian reference systems, 3
Indian navigation land uplink stations, 3
Indian Mission Control centres, 1
Geostationary satellite and 4 GPS satellite.
● GAGAN will provide the accurate and
reliable position of aircraft covering the area
from Australia and South Africa stretching
into Middle East.
● This will be helpful for landing aircraft in
tough weather and terrain like Mangalore
and Leh airports.

7. ADS-B WITH GAGAN
● ADS-B with GAGAN will facilitate the
efficient inter-aircraft communication
and the flow of data between the base
station.
● Every aircraft will know their exact
location with respect to the other
nearby aircrafts in the airspace.
● ATC will be helping by giving the
weather related data but the pilots will
have their liberty to take their own
decisions as they will have all the
information about nearby airspace
● ADS-B with GAGAN will make the
airspace more safe and secure.

8. 1966 Charkhi Dadri Mid-Air Collision
● The aircraft involved were a Saudi
Arabian Airlines Boeing 747-100B en
route from New Delhi to Dhahran,
Saudi Arabia and Kazakhstan Airlines
ILyushin II-76 en route from Shymkent
Kazakhstan, to New Delhi.
● The collision took place at 14,000 feet
over the Indian Air space which
claimed the lives of 349 people. Both
the aircrafts were being guided by the
Delhi ATC.
● This could have been avoided using
ADS-B with GAGAN

9. CONCLUSION
● ADS-B technology along with GAGAN can be
used to transform the airspace by providing
more accurate and reliable tracking of flights in
and on the ground.Many air incidents such as
the 1996 Charkhi Dadri Mid-Air Collision ,
MH370 and many more could have been
avoided if the ADS-B technology is used
along with GAGAN. There is an urgent need to
shift from the currently used radar based
surveillance to satellite based navigation
surveillance.As the number of passengers are
going to reach two billion by 2015, there is a
critical need for practical implementation of
ADS-B technology with GAGAN for the
protection of these passengers.

10. THANK YOU
THANK YOU...!