Satellite Communication Flashcards
____ was drifted to 3-degrees West orbital slot.
Agila 2 or ABS-5
Contained within the repeater are the _____.
transponders
Elements of Antennas
reflectors
feeds
feed networks
support
structure and pointing mechanisms
____ is the business-end of the satellite
payload
Sputnik 2 was launched on ____.
November 3, 1957
Sputnik 2 carried the first living passenger into orbit a dog named ____.
Laika
Derived from the Latin word ____ meaning guard, attendant or companion.
Satelles
The United States’ Global Positioning System (GPS) consists of up to ________ with the exact number of satellites varying as older satellites are retired and replaced.
32 MEO satellites in six (6) different orbital planes (31 working, 1 spare)
An orbit around planet Mars.
Areocentric
Renamed it to ____ and remain in service until June 2014.
ABS-3
____ to maintain the electronics and other components within a safe temperature range over the life of the satellite.
Thermal control
____ out of 5,465 belongs to the United States.
3, 433
A ____ consists of a number of electronic components onboard the satellite.
transponder
A geostationary orbit stays exactly ______.
above the equator
A semi-synchronous variation of a Tundra orbit. For Earth this means an orbital period of just under 12 hours.
Molniya Orbit
This is a TV signal distribution system designed to distribute signals directly to consumers.
Direct Broadcast Satellite (DBS) service
Explorer 1 was launched on ___.
January 31, 1958
____ is currently the world’s most utilized satellite navigation system.
GPS
____ is the time it takes for a satellite to complete
period
The basic elements of a communication satellite service:
Space Segment
Ground Segment
Narration About Four Satellites of Jupiter Observed
Johannes Kepler, 1610
Refers to an object orbiting a planet
Satellite
Typical rotational periods range from about ____ for a 100-mi height to 24 h for a 22,300-mi height.
1 ½ h
NAVSTAR GP, operational since ____ and globally available since _____.
1978
1994
A path described by one body in its revolution.
Orbit
____ act as relay stations in the sky and permit reliable long-distance communication worldwide.
Communication satellites
Global Navigation Satellite System
NAVSTAR GPS
GLONASS
GALILEO
An orbit around the Sun.
Heliocentric
As of ____, there are 5,465 operational (active) satellites in orbit around the Earth.
April 20, 2022
Diwata-1 was deployed into orbit from the ISS in _____.
April 27, 2016
Particular Group of Applications
Video distribution
Data communication
Telephone services
The ____ create “footprint” coverage but require the repeater to receive and transmit the actual signals from and to the ground.
antennas
____ systems can provide global coverage unavailable with land based systems satellites.
Satellite navigation
An orbit whose period is a rational multiple of the average rotational period of the body being orbited and in the same direction of rotation as that body.
Synchronous
Built by ____, the satellite provides the most powerful coverage in the Asia Pacific region.
Space Systems/Loral
Has an inclination of ____.
90 degrees
Agila 2 provides telecommunications services for the Mabuhay Philippines Satellite Corporation before being sold to ABS in ___.
2009
The system can be used for providing position, navigation or for tracking the position of something fitted with a receiver (satellite tracking).
SatNav
____ was launched in March 20, 1987 under the name ____ in Cape Canaveral Air Force Station.
Agila-1 or Mabuhay
Palapa B2-P
An orbit whose inclination in reference to the equatorial plane is not 0.
Inclined
Circular orbits are _____.
simplest
All geostationary orbits must be geosynchronous, but not all geosynchronous orbits are geostationary.
True
An orbit whose inclination is equal to zero with respect to some plane of reference.
Non-inclined
____ contains the support vehicle and control subsystems that allow the payload to perform its mission as a microwave repeater in space.
BUS
It is the first Philippine microsatellite and the first satellite built and designed by Filipinos.
Diwata-1
An orbit around planet Earth.
Geocentric
An orbit around the center of galaxy.
Galactocentric
____ is a system that uses satellites to provide autonomous geo-spatial positioning.
SatNav
____ to assure that the antennas are pointed at the ground.
Attitude and spacecraft control processing
____ to hold everything together and protect the subsystems during launch and after deployment on orbit.
Structure
This time is also called the _____.
sidereal period
____ to be used to correct the orbit.
Reaction control system (propulsion)
____ consist of the spacecraft & launch mechanism
space segment
Geocentric orbits ranging in altitude from 2,000 km (1,240 miles) to just below geosynchronous orbit.
Medium Earth Orbit
First artificial satellite launched by Soviet Union (USSR)
Sputnik 1
Particular Group of Users
Corporate enterprise
Government agency
Non-profit organization
Internet service provider
It is an Artificial object which has been intentionally placed into orbit.
Artificial Satellite
The First artificial satellite of the United States.
Explorer 1
Orbits around Earth matching Earth’s sidereal rotation period.
Geosynchronous or Geostationary Orbit
____ is the use of satellite technology in the field of communications.
Satellite communications
An orbit with an orbital period equal to half of the average rotational period of the body being orbited and in the same direction of rotation as that body.
Semi-synchronous
____ was launched by Long March 3B in 1997 at China.
Agila 2 or Mabuhay 1
A nearly polar orbit that passes the equator at the same local solar time on every pass.
Polar Sun-synchronous
____ to provide all of the prime power.
Solar panels
It allows small electronic receivers to determine their location (longitude, latitude, and altitude/elevation) to high precision (within a few metres) using time signals transmitted along a line of sight by radio from satellites.
SatNav
____ also known as PHL-Microsat-1
Diwata-1
____ to operate the satellite when it is hidden from the sun by the earth or moon (called eclipse, happening for up to 70 minutes a day during equinox season).
Batteries
____ is the latest satellite launched in the outer space last March 4, 2024.
STARLINK-31270
It was originally under Indonesian Company, PT Pasifik Satelit Nusantara until it was acquired by Philippine Company, Mabuhay Satellite Corporation which is under PLDT in ____.
1996
The ____ is a network of earth stations and user terminals that provides applications and services to end users.
ground segment
A geosynchronous orbit may swing ____ to cover more of the Earth’s surface.
north and south
____ launched on ____ is set to replace ABS-3 which has long exceeded it design life.
ABS-3A
March 2015
A synchronous but highly elliptic orbit with significant inclination (typically close to 63.4°) and orbital period of one sidereal day (23 hours, 56 minutes for the Earth).
Tundra Orbit
Orbit changes can be used to ______.
extend the life of satellites
An orbit that passes above or nearby above both poles of the planet on each revolution.
Polar
The satellite’s operation ended in ____ and was deorbited.
January 1998
The signals also allow the electronic receiver to calculate the ____, which allows time synchronization.
current local time to high precision
Geocentric orbits with altitudes from
160 to 2,000 km (100–1,240 mi).
Low Earth Orbit (LEO)
The European Union and European Space Agency agreed in March 2002 to introduce their own alternative to GPS, called the _____.
Galileo positioning system
The ITU has grouped the satellite services in to three main groups:
Fixed Satellite Services (FSS)
Broadcast Satellite Services (BSS)
Mobile Satellite services (MSS)
Classification of Satellite:
Natural and Artificial
____ can be used to give quasi stationary behavior viewed from earth
Elliptical orbits
The Galileo system consists of ____ is expected to be compatible with the modernized GPS system.
30 MEO satellites in three (3) different orbital planes (24 working, 6 spare)
Satnav systems operate independently of any ____ though these technologies can enhance the usefulness of the positioning information generated.
telephonic or internet reception
An orbit around the Earth with a period equal to one sidereal day, which is Earth’s average rotational period of 23 hrs, 56 min., 4.091 sec.
Geosynchronous (GSO)
____ is the period of time that elapses between the successive passes of the satellite over a given meridian of earth longitude.
One revolution
A circular geosynchronous orbit with
an inclination of zero.
Geostationary Orbit (GEO)
The proposed new systems use low-earth-orbit satellites to perform the relay services to the main telephone system or to make connection directly between any two cellular telephones using the system.
Satellite Cell Phones
Diwata-1 is a Philippine microsatellite launched to the International Space Station (ISS) in _____.
March 23, 2016
____ can look at the earth and transmit what they see back to ground stations for a wide variety of purposes, including military intelligence, meteorological applications, and mapping.
Surveillance satellites
The full orbital constellation of ______ enables full global coverage.
27 MEO satellites in three (3) different orbital planes (24 working, 3 spare)
Inclined orbits are useful for coverage of ______.
equatorial regions
____ comprises the earth station and network control center of entire satellite system.
ground segment
Types of Repeaters
microwave receivers
RF multiplexer
power amplifiers
channel processing and switching
The ____, is a space-based satellite navigation system that provides a civilian radionavigation-satellite service.
Russian, Global’naya Navigatsionnaya Sputnikovaya Sistema, Global Navigation Satellite System), or GLONASS
Geocentric orbits above the altitude
of geosynchronous orbit.
High Earth Orbit
Date of Sputnik 1 launched.
October 4, 1957
