Geosynchronous Satellite: a slide for BMARPC lecturer cum network engineer recruitment. It was a fantastic experience. It was about satellite, classification, basic theory, difference and most importantly Bangabandhu 1 satellite!
2. Topics to be covered
1. Definitions
2. History
3. Geosynchronous & Geostationary
4. Application
5. Advantages
6. Disadvantages
7. Solutions
8. Bangabandhu - 1
9. Conclusions
10. . Questions
3. 1. Definition of Satellite
Artificial body
Placed in orbit
Rounding planet
To collect data
Two Types -
Natural
Moon
Artificial
Low Earth Orbit [180-200km]
Medium Earth Orbit [2000-35786km]
Geosynchronous orbit [35786km]
High Earth Orbit [>35786km]
4. 1. Def. of Geosynchronous Satellite
Satellite that
in geosynchronous orbit
Synced with earth rotation period [23 h 56 m
4.09s]
Reach same place after 1 day
Have inclination
Orbital path observed as number 8
Example -
Russian Raduga 29
Indian Astra 1C
Malaysian MEASAT 2
6. 2. History
Father of geosynchronous satellite is Harold Rosen, an engineer at
Hughes Aircraft Company
First geosynchronous satellite Syncom 2 - launched July 26, 1963
As of October 2018, 446 active geosynchronous satellites
Some of which are not operational
7. 3. Geostationary & Geosynchronous
Special type of geosynchronous satellite
Geosynchronous Satellite that -
Circulating over equator
Remains stationary relative to the Earth's surface
Have not inclination
Observed as stalled at fixed point
Most communication satellite are geostationary
9. 4. Application
Voice communication
Internet
Broadcasting cable TV and radio signals
Weather forecasting
Communicating back and forth with spacecraft
Hubble Space Telescope
Space Shuttles
Geostationary satellites gives
Detailed info of specific region
Act as a spy satellite!
10. 5. Advantages
Get high temporal resolution data.
Tracking of satellite is simplified.
Satellite always in same position.
But geostationary satellites gives more
Do not need to track such a satellite
Less expensive than synchronous satellite
Revolutionized global communications, broadcasting, forecasting
Have importance at defense and intelligence applications.
11. 6. Disadvantages
Incomplete geographical coverage
Satellite dishes pointed towards the horizon
The signals blocked by land topography, vegetation or buildings
Geostationary satellites have signal delay approximately 0.25 of a second
Difficulty of telephone conversation
Reduces the performance of network protocols such as TCP/IP
12. 7. Solutions
Special inclined path with elliptical orbits. e.g. Molniya / Orbita,
Sirius Radio satellites
Proprietary satellite data protocols that are partial solution to the
poor performance of native TCP over satellite links.
TCP presumes that all loss is due to congestion, not errors, and
probes link capacity with its "slow-start" algorithm
13. 8. Bangabandhu 1
National pride.
1
st
BD geostationary[geosynchronous] satellite
Located at the 119.1° East longitude geostationary
slot
For communication & broadcasting
40 transponder [ 26 Ku band & 14 C band]
16. 9. Conclusions
Satellite in geosynchronous orbit [35786km]
Round earth within 1 day
Ease communication [sending, receiving]
Rounding over equator are known as geostationary.
Bangabandhu 1 is one of them!
Observing geostationary as fixed while geosynchronous as
moving