CONTROL SERVO SYSTEM-GMRT

BY.......

133248,

SHRIJEEB GHOSH,THIRD YEAR,

ELECTRONICS AND TELECOMMUNICATIONS,INSTITUTE OF TECHNOLOGY(ULHASNAGAR)

Index:i. Types of antennasii. Introductioniii. Contextiv. Nested control loopsv. Alt-Azimuth Positioning Control Systemvi. Control Servo System Block Diagramsvii. Observationsviii. Advantages and advancements

CONTROL SERVO SYSTEM-GMRT

TYPES OF ANTENNA

S

TURNABLE ANTENNA

S

FIXED

ANTENNAS

INTRODUCTION:

Giant

Metrewave

Radio

telescope

World’s largest radio telescope at metrewaves

Designed and fabricated in India

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

INTRODUCTION:

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

Heavy in weight Antenna alt-azimuth Positioning Control System

CONTEXT:

General process of nested control loops

nested control loops in antennas

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 elimination

alt-azimuth Positioning Control System

Dismantled layout

Schematic of Alt-Azimuth control system

simplified diagram of alt-azimuth control system

PRINCIPLE OF POSITION CONTROL SYSTEM

GMRT SERVO CONTROL BLOCK DIAGRAM

observation:

CONTROL SERVO SYSTEM-GMRT

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 alt-azimuth servo system

Limit power consumption of motors

CONTROL SERVO SYSTEM-GMRT

advancements:

Economical(once installed, the position is adjusted using such system)

Provides high accuracy to space researchers

advantages:

THANK YOU….Queries….

….Expected….