4A Flashcards
(51 cards)
The ___ provides a reliable, high-capacity, quality communications capability in support of peacetime, contingency, and wartime operations.
Defense Satellite Communications System (DSCS)
Specifically, the DSCS provides what?
high availability communications services
DoD manages the satellites with direction from…?
Defense Information Systems Agency (DISA).
Satellites in a DSCS network are considered ___ by users since the cost
of bandwidth and hardware are paid at the Service level.
free
All DSCS satellites have a frequency plan. What is a frequency plan?
A frequency plan is a way to map how frequencies translate up or down to create a full duplex link.
DSCS satellites have ___ channels, or transponders, that are used to transmit and/or receive.
six
Channels 1 – 5 perform a ___ MHz translation frequency while channel 6 performs a ___ MHz translation frequency.
725 MHz
200 MHz
Guard bands are used to prevent interference, so channels are spaced ___ MHz apart.
25 MHz
Guard bands are used to prevent what?
Interference
DSCS satellites operate mainly in the __-band
X
DSCS satellites have a beacon frequency of ___ MHz to locate the satellite in the sky.
7,600 MHz
Each satellite will also produce a ___ to ensure use of the correct satellite. i.e.: 7,604.705 MHz.
pseudo-beacon
The ___ system is a constellation of highly capable military communications satellites that leverage cost-effective methods and technological advances in the communications satellite industry.
WGS (Wideband Global Satellite)
The WGS system is composed of three principal segments:
space segment (satellites), control segment (operators) and terminal segment (users).
What are the DoD’s highest-capacity communications satellites?
WGS Space Vehicles (SV)
Each WGS satellite provides service in both the __ and __ frequency bands, with the unprecedented ability to cross-band between the two frequencies onboard the satellite.
X and Ka bands
WGS augments the ___ Global Broadcast Service (GBS) service through new ___ Ka-band service.
one-way
two-way
Just ___ WGS satellite provides more SATCOM capacity than the entire legacy DSCS
constellation.
one
___ is a constellation of military communications satellites in geosynchronous orbit that are operated by the United States Air Force and provide secure and jam-resistant worldwide communications to meet the requirements of the Armed Forces of the United States.
MILSTAR
___ MILSTAR spacecraft were launched between 1994 and 2003, of which five (5) are operational; the third launch failed, both damaging the satellite and leaving it in an unusable orbit.
six
MILSTAR satellites provide ___, ___, ___ to meet the requirements of the United States military.
secure
jam resistant
worldwide communications
MILSTAR satellites were built by Lockheed Martin Missiles and Space
Corporation, at a cost of $___ million each.
$800
Each MILSTAR satellite has a design life of ___ years.
10
MILSTAR satellites are composed of processing satellites with on-board ___ and ___, a configuration that is inherently more jam-resistant than conventional transponder satellites.
demodulation
switching
