SATELLITE COMMUNICATIONS

SATELLITE COMMUNICATIONS

Engr. Cezar N. Velasco Jr.

Satellite

• A spacecraft placed in orbit around the earth which carries on board microwave receiving and transmitting equipment; repeater, capable of relaying signals from one point on earth to other points.

Significant Milestones in Satellite Technology

October 1945 - Arthur C. Clark, first suggested

the idea of communications satellites in geosynchronous

1946- Scientists discovered they

could bounce microwaves off the moon through their work on “Project Diana”

- handed to Col. John DeWitt

Significant Milestones in Satellite Technology

1954 - the moon became the first passive

satellite.

1956 - U.S. Navy engineers began using the

moon’s surface to reflect microwave radio signals between Washington D.C. and Hawaii.

1957 - Russia launched the SPUTNIK 1 the first

active satellite

Significant Milestones in Satellite Technology

1958 - NASA lunched “Score”, a

150lbs. Conical shaped satellite.

1960 - launched Echo, a 100 foot

diameter plastic balloon with aluminum coating

- The Department of Defense launched “Courier”

Significant Milestones in Satellite Technology

1962 - AT & T launched the TELSTAR 1 the

first duplex satellite transmission

1963 - AT & T launched TELSTAR II for

telephone, TV, fax and data transmission

- launched Syncom I, first geosynchronous satellite into orbit.

1964 - Syncom III launched

Significant Milestones in Satellite Technology

1965 - Intelsat launched the

EARLY BIRD which transmitted messages to five earth stations with 66 telephone circuits.

- used two transponder and 25 MHz BW

Significant Milestones in Satellite Technology

1966 - The National Development

Company and POTC established the DOMSAT ushering satellite technology to the Philippines

- Soviet Union launched Molniya, meaning lightning.

-Anik from Canada, meaning little brother

Significant Milestones in Satellite Technology

1967 - PHILCOMSAT;

Philippines, installed the first earth station at the foot of Sierra Madre Mountains, Mount Pinugay, Baras, Rizal

Significant Milestones in Satellite Technology

1974 - Western Union launched the

WESTAR for TV and data transmission

1975 - Radio Corporation of America

launched Satcom.

1976 - Indonesia launched its first

satellite; PALAPA A-1

Significant Milestones in Satellite Technology

1988 - India launched its first

satellite; INSAT-1C

- Russia launched the OKEAN for remote sensing

Significant Milestones in Satellite Technology

1993 - Thailand launched its

first satellite; THAICOM 1.

- They also launched the Microsatellite Program through United NASA and GE

Significant Milestones in Satellite Technology

1997 - Mabuhay Philippines

Satellite Corporation launched AGUILLA II; the first Philippine Satellite

Sputnik 1 - the first active satellite

(Russia), (21 days)

Significant Milestones in Satellite Technology

Explorer I - transmitted telemetry

information for nearly 5 months

Score - with on-board tape

recording, the first artificial satellite used for relaying terrestrial communications

Significant Milestones in Satellite Technology

Echo - accomplish the first

transatlantic transmission

Courier - the first transponder type

satellite lasted only 417 days

Significant Milestones in Satellite Technology

Telstar I - the first active satellite to

simultaneously receive and transmit radio signals

Telstar II - was electronically identical

to Telstar I, except it was more radiation resistant

Significant Milestones in Satellite Technology

Syncom I - was the first attempt to

place geosynchronous satellite into orbit but was lost during orbit injection

Syncom III - used to broadcast the

1964 Olympic Games from Tokyo