M2 B3 Flashcards
Which of the following is not one of the three distinct elements that work together to make satellite communication (SATCOM) possible?
Payload segment
which of the following is not a function of the (satellite communication) SATCOM control segment?
Ground control
Which term describes the longest distance across an elliptical orbit?
Major axis
What is the inclination angle of a polar orbit?
90*
Which are the two types of communications satellites?
Active and passive
Which satellite reflects signals transmitted toward it?
Passive
Which of the following satellite look angle methods is provided by (satellite communication SATCOM planners?
Satellite access authorization
Which satellite access technique is being used when all channels are pooled and used by any station according to its instantaneous traffic load?
Demand assigned multiple access (DAMA).
Conflicts regarding Defense Satellite Communications System (DSCS) ground mobile forces
Joint Staff
One of the functions of the telecommunication certification office is to
ensure the user agency is prepared to pay for the service
Telecommunications service orders are issued by the
Defense Information Systems Agency (DISA).
Astronomical time is based on
the apparent motion of the sun in the sky
What time scale gives us a universally agreed to standard time scale with the stability and accuracy of atomic time and synchronous operation with the earth’s motion about the sun we can depend on?
Coordinated universal time
What two factors cause a quartz oscillator’s resonant frequency to drift?
Temperature and aging
The operation of the atomic clock is based on the phenomenon that
atoms release energy at a particular resonant frequency
To determine the number of hours coordinated universal time (UTC) differs from your local time, you must determine the number of time zones between your location and the location of the zero
meridian
Coordinated universal time (UTC) is based on what kind of clock system?
24-hour
A number of organizations can maintain accurate time-of-day clocks by referencing a standard time interval of one
second
The agency responsible for coordinated universal time (UTC) is the
International Bureau of Weights and Measures (BIPM)
What is multiplexing?
Combining multiple information channels onto a common transmission medium
What specifically does wavelength division multiplexing assign each incoming optical signal?
Frequency of light
Which multiplexing division technique samples each low speed channel in sequence to interleave bits or characters and then transmit them at high speed?
Time
Which of the following relies on the transmitter to send multiple copies of the same message to the distant end using a predetermined algorithm?
Forward error correction
Which SATCOM system module is used to produce the final transmit frequency?
Up converter
Which type of power amplifier uses semiconductor transistors designed for microwave and higher frequency RF operation?
Solid state
Which module is the first step of the receive signal path?
Low noise amplifier
Which module strips away the intelligence from the Intermediate frequency?
Demodulator
When establishing a communication link with a satellite the required sequence of events is
orbit prediction, antenna pointing, satellite acquisition, and satellite tracking
Which tracking method requires no input from a satellite?
Programmed track.
What signal originating from the satellite do we use to acquire and track the satellite?
Beacon
Which type of diversity do you have when the same frequency radiates simultaneously in two different planes?
Polarization
Which type of diversity requires two antennas, two receivers, and two transmitters?
Polarization
What is the tropo/satellite support radio frequency range?
14.4 to 15.25 GHz
What are the Air Force Satellite Control Network (AFSCN) command and control nodes?
Environmental Satellite Operations Center at Schriever AFB, CO, and National Oceanographic
and Atmospheric Administration (NOAA) Satellite Operations Control Center at Suitland, MD
The MARK IVB antennas can be located up to how many feet away from the processing area?
1500
Which mission is the highest priority of the Defense Support Program (DSP)?
North American warning
Which set of equipment represents the satellite readout station equipment group?
Radio frequency set, transmit/receiver set, and digital equipment set
What is the number of Global Positioning System (GPS) orbital planes?
6
Which military strategic and tactical relay (MILSTAR) capability is very different from previous military satellite communications (MILSATCOM) and commercial satellite communications systems?
Crosslinking
Which element of the military strategic and tactical relay (MILSTAR) mission allocates communication resources?
Planning
The military strategic and tactical relay (MILSTAR) satellite sends downlink communications transmissions at
ultrahigh frequency (UHF) and super-high frequency (SHF)
Which military strategic and tactical relay (MILSTAR) antenna provides high gain, selective coverage of any ground station visible on the earth’s surface within its own footprint?
Spot beam
Which satellite system provides Global Broadcast Services (GBS)?
Ultrahigh frequency (UHF) follow-on
How many ultrahigh frequencies (UHF) channel are available for each UHF Follow-on satellite?
39
When considering the factor of service area for commercial satellite services, which description about Ku-band service is true?
Not worldwide, located primarily over land masses and highly populated areas
What services are not included in INMARSAT mobile satellite services (MSS)?
Iridium
Which commercial satellite communication system can offer true pole-to-pole global coverage?
Iridium
Where is the Inmarsat headquarters located?
London, England
Which type of communications is not normally provided through commercial wideband services?
Handheld satellite phone communications
Which satellite company is specifically designed to interface with all current X-band terminals?
XTAR
