IF U WISH TO RESEARCH ON TURNABLE ANTENNAS, PLEASE REFER IT........

1. CONTROL SERVO
SYSTEM-GMRT
BY.......
133248,
SHRIJEEB GHOSH,
THIRD YEAR,
ELECTRONICS AND TELECOMMUNICATIONS,
INSTITUTE OF TECHNOLOGY(ULHASNAGAR)

2. CONTROL SERVO
SYSTEM-GMRT
Index:
i.
ii.
iii.
iv.
v.
vi.
vii.
viii.
Types of antennas
Introduction
Context
Nested control loops
Alt-Azimuth Positioning Control System
Control Servo System Block Diagrams
Observations
Advantages and advancements

3. TYPES OF
ANTENNAS
TURNABLE
ANTENNAS
FIXED
ANTENNAS

4. INTRODUCTION:
Giant
Metrewave
Radio
telescope

World’s
largest radio
telescope at
metrewaves

Designed and
fabricated in
India

5. INTRODUCTION:
 Over
One of the 30
nos. of 45m diameter
Dish Antenna of the
GMRT
 Microwaves
Antennas for
Radio Astronomy
Applications

6. CONTEXT:
Important
to be controlled by a
precession control system to point to
the radio source
The
GMRT servo system has
designed with three Nested
control loops
in weight Antenna altazimuth Positioning Control
System
Heavy

7. General process of
nested control loops

8. nested control loops in
antennas

9. alt-azimuth Positioning
Control System



Moves the dish in a
plane parallel to earth
surface
Also moves the dish
in a plane
perpendicular to
earth surface
2 motor drive per
axis, for backlash

10. Dismantled layout

11. Schematic of AltAzimuth control system

12. simplified diagram of
alt-azimuth control
system

13. PRINCIPLE OF POSITION
CONTROL SYSTEM

14. GMRT SERVO CONTROL
BLOCK DIAGRAM

15. CONTROL SERVO SYSTEMGMRT
observation:
Conclusion:
Observe
and study the control
servo system used for turnable
antennas
Study a special type of motor(A-Z
motor)
Highlight the Limitations of altazimuth servo system

16. CONTROL SERVO SYSTEMGMRT
advantages:
Economical(once
installed, the
position is adjusted using such
system)
Provides high accuracy to space
researchers
advancements:
Limit
power consumption of motors

17. THANK YOU
….Queries….
….expected….