GLOBAL POSITIONING SYSTEM

Presented By

Asheem Kumar Palo

Ranjan Majhi

INTRODUCTION TO GPS

The GPS project was developed in 1973 by

U.S. Department of Defence

The relatively high positioning accuracies

The capability of determining velocity and time, to

an accuracy commensurate with position

The signals are available to users anywhere on

the globe

It is a positioning system with no user charges

It is an all-weather system, available 24 hours a day

GPS is the backbone for modernizing the global air traffic system

The position information is in three dimensions

TRIANGLUATION

Three ranges are enough if we reject ridiculous

answers or use other tricks

Position is calculated from distance measurements

(ranges) to satellites

Another range is required for the proper accuracy

Mathematically we need four satellite ranges to

determine exact position

STRUCTURE

The current GPS consists of three major segments.

These are:

space segment (SS)

control segment (CS)

user segment (US)

SPACE SEGMENT

GPS block II-A satellite on display at the

San Diego Air & Space Museum

CONTROL SEGMENT

The control segment is composed of

1. monitor stations

2. master control station (MCS)

3. ground antennas

USER SEGMENT:

GPS receivers shown here from

manufacturers Trimble & Garmin

APPLICATIONS

Military

US military tests GPS-guided

missile “Scorpion”

• Navigation

• Target tracking

• Missile and projectile guidance

• Search and Rescue

GPS on Air Planes

GPS in marine system

CIVILIAN USES

Disaster relief/emergency services

Map-making

Navigation

Robotics

Surveying

CIVILIAN USES

Other satellite navigation systems

• GLONASS – Russia's global navigation system fully

operational worldwide.

• Galileo – a global system being developed by the European

Union and other partner countries, planned to be operational by 2014

• Beidou – People's Republic of China's regional system,

currently limited to Asia and the West Pacific

• COMPASS – People's Republic of China's global system,

planned to be operational by 2020

• IRNSS – India's regional navigation system, planned to be

operational by 2012, covering India and Northern Indian Ocean

• QZSS – Japanese regional system covering Asia and Oceania