1a - Jam Resistant Communications Flashcards
Refers to a system originally developed for military applications, to provide secure communications by spreading the signal over a large frequency band.
Spread spectrum
The two predominant techniques to spread the spectrum?
Direct Sequence Spread Spectrum (DSSS)
Frequency hopping (FHSS)
The use of DSSS for multiple access is called ____.
Code Division Multiple Access (CDMA)
Introduces rapid phase transition to the data to make it larger in bandwidth.
DSSS
Makes the narrow band signal jump in random narrow bands within a larger bandwidth.
Frequency Hopping (FHSS)
Provides secure, flexible, and jam-resistant information transfer in real time among the dispersed and mobile units, characteristic of modern armed forces.
JTIDS/MIDS
JTIDS/MIDS acronym
Joint Tactical Information Distribution System / Multifunctional Information Distribution System
JTIDS/MIDS terminals operate on the principal of ____.
Time Division Multiple Access (TDMA)
The JTIDS/MIDS system operates in the ____ frequency band.
960 - 1215 MHz
A wireless, networked, digital data system specifically designed to provide/receive data to/from ground forces on the move.
EPLRS (Enhanced Positioning Location Reporting System)
SADL (Situational Awareness Data Link)
Airborne equivalent of the EPLRS.
SADL (Situational Awareness Data Link)
A United States military term for a GPS-enabled capability that provides military commanders and forces with location information about friendly and hostile military forces.
FBCB2/BFT1
A technology upgrade from FBCB2/BFT to provide improved capability and ensure interoperability between Army and Marine Corps forces.
FBCB2 JCR/BFT2
A networked mission command information system that enables Army and Marine Corps’ units to share near real time friendly, enemy, and battlefield situational awareness, operational maps and graphics, and command and control (C2) messages.
Joint Battle Command - Platform (JBC-P)
The many forms of data links used in the joint services?
LINK 11, LINK 11B, LINK 16, EPLRS, and SADL.
Formerly known as TADIL A, its purpose is to exchange electronic warfare (EW) data, air, surface, and subsurface tracks and points with the amplifying data in real-time, as well as transmission of orders, alerts, and commands
Link 11
Link 11 is a _____ link that has a shared data rate of up to 2400 bits per second (bps). It has a channel size of 6 KHz in HF and a channel size of 25 KHz in UHF.
half-duplex
Link 11 is a half-duplex link that has a shared data rate of up to ____. It has a channel size of 6 KHz in HF and a channel size of 25 KHz in UHF.
2400 bits per second (bps)
Link 11 is a half-duplex link that has a shared data rate of up to 2400 bits per second (bps). It has a channel size of ___ in HF and a channel size of ___ in UHF.
6 KHz
25 KHz
Formerly known as TADIL B, ___ is a secure, full-duplex, point-to-point digital data link that uses serial transmission. Its purpose is to exchange EW data, air, surface, and subsurface tracks and points with the amplifying data in real-time, as well as transmit orders, alerts, and commands.
Link 11B
____ sets itself aside from Link 11 in that it is not associated with RF transmissions and does not use a modulated waveform. It is a circuit, usually combined with other circuits in a multiplexer, and is transmitted as data.
Link 11B
Link 11B has a shared data rate of up to ___.
1200 bps
___ is the language used on JTIDS/MIDS to send messages.
Link 16
Formerly known as TADIL J, ___ is a secure,
frequency hopping (FH), line-of-sight (LOS) data link whose primary purpose is situational awareness and C2.
Link 16
LINK 16 operates in the ____ and has a robust anti-jam mode, which hops over 51 frequencies that are spaced 3 MHz apart from one another.
L-band (960-1215 MHz)
LINK 16 operates in the L-band (960-1215 MHz) and has a robust anti-jam mode, which hops over __ frequencies that are spaced __ apart from one another.
51
3 MHz
