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INTRODUCTION TO JTIDS/MIDS LINK 16
IDLS 2003
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TERMINOLOGY JTIDS MIDS Joint Tactical Information Distribution System
Multifunctional Information Distribution System INFORMATION - sensors, navigation, status, commands, vectors, position DISTRIBUTION - via Link-16 SYSTEM - Platforms joined in a tactical environment IDLS 2003 C.1.2
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TERMINOLOGY JTIDS/MIDS refers to the communications equipment necessary to exchange Link 16 messages This includes: Terminal hardware and software RF equipment Resulting waveform generated IDLS 2003
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ENVIRONMENTS Air Surface Subsurface Land Space IDLS 2003
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IJMS Interim JTIDS Message Standard Bases on Link 11 M-Series messages
Adapted to utilise basic JTIDS architecture Class 1 or Bilingual Terminals IDLS 2003
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LINK 16 256 combinations of label and sub-label
Message standard (STANAG 5516) 256 combinations of label and sub-label Link 16 messages support: Surveillance Network Management Control EW Voice Free text messaging IDLS 2003
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TECHNICAL CHARACTERISTICS
L Band UHF 51 Frequencies 969 to Mhz Intervals IDLS 2003
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TACAN / DME Channels spaced every 1 MHz
IFF Filters 14 Frequencies 5 Freq’s 32 Frequencies 960 1030 1090 1215 TACAN / DME Channels spaced every 1 MHz 969 1206 Link-16 Frequencies spaced every 3 MHz (51 Frequencies) IDLS 2003
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ARCHITECTURE JTIDS/MIDS Link-16 is a data link that is: Real Time
Secure ECM Resistant High Capacity Non-Nodal IDLS 2003
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ARCHITECTURE Broadcast type system No critical nodes
each unit can receive directly from all other assigned units No critical nodes if one terminal goes down, the network is not crippled IDLS 2003
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ARCHITECTURE Time Division Multiple Access (TDMA)
Time is divided into 128 time slots per second Each terminal can either transmit or receive IDLS 2003
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EPOCH = 64 FRAMES EPOCH = 12.8 mins = 98304 DAY (24 Hours) Timeslots
= EPOCHS EPOCH = 64 FRAMES 1 FRAME = 12 Seconds FRAME = 1536 Timeslots 1Timeslot = ms IDLS 2003
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ARCHITECTURE Each time slot is allocated to a specific user for transmission. All other users receive in that time slot. IDLS 2003
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TIMESLOT Timeslot equates to 7.8125msec 1536 timeslots in 12 seconds
Timeslot comprises several components IDLS 2003
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TIMESLOT Number of elements within a timeslot Jitter Synchronisation
Time refinement Message header and data Propagation IDLS 2003
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TIME SLOT STRUCTURE Jitter - variable time delay in the start of a transmission of a time slot; standard double pulse and packed-2 single pulse message packing structures SYNC JITTER HEADER DATA PROPAGATION milliseconds IDLS 2003
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TIME SLOT STRUCTURE Synchronization - a pattern of pulses that allows the receiving terminal to synchronize to the transmission JITTER SYNC HEADER DATA PROPAGATION milliseconds IDLS 2003
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TIME SLOT STRUCTURE Time Refinement - used for Class 1 compatibility only JITTER SYNC HEADER DATA PROPAGATION milliseconds IDLS 2003
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TIME SLOT STRUCTURE Header - 35 bit word providing information concerning the message(s) transmitted in the time slot JITTER SYNC HEADER DATA PROPAGATION milliseconds IDLS 2003
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TIME SLOT STRUCTURE Data - message(s) transmitted in the time slot;
3, 6, or 12 TADIL J words, depending on packing structure JITTER SYNC HEADER DATA PROPAGATION milliseconds IDLS 2003
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TIME SLOT STRUCTURE Propagation - time period to allow the signal to propagate to 300 or 500 NM prior to start of next time slot JITTER SYNC HEADER DATA PROPAGATION milliseconds IDLS 2003
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TIMESLOT Header and Data Link 16 message words taken in groups of:
3 words (Std) 6 Words (P2) 12 Words (P4) Header specifies: Message Type Coding Packing |Structure Source terminal IDLS 2003
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STANDARD PACKING STRUCTURE
TIME SLOT MILLISECONDS S TR H DATA PROPAGATION JITTER 3.354 MILLISECONDS MILLISECONDS MINUS JITTER S = SYNCHRONISATION TR = TIME REFINEMENT H = HEADER IDLS 2003
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ACCESS METHODS Dedicated Contention Time slot re-allocation
Guaranteed reception Inflexible Contention Flexible Reception uncertainty Time slot re-allocation Shared Pool Unit requests share IDLS 2003
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ECM RESISTANCE Double Pulse Jitter Frequency Hopping
Crypto variable Encoding Message Preparation IDLS 2003
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SECURITY Message Security (MSEC) Transmission Security (TSEC)
Common Variable Mode Partitioned variable mode Auto rollover IDLS 2003
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MESSAGE PREPARATION Message Packets Reed-Solomon encoding Interleaving
All J-Series Fixed Format words Interleaving CCSK Random Noise IDLS 2003
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NETWORK ENTRY Network Time Reference (NTR)
First Platform in net Transmits Initial Entry Message (IEM) every 12 seconds IDLS 2003
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NETWORK ENTRY Platform other than NTR required to synchronise
IDLS 2003
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NET ENTRY Time Slots belonging to Net Entry Time Slot Block A-0-6
Time error to within propagation time (clock correction) Estimate of current system time Estimate of time of next entry time slot Time uncertainty Time Slots belonging to Net Entry Time Slot Block A-0-6 Coarse Synchronization will take place using this time slot IDLS 2003
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FINE SYNCHRONISATION Actively or passively Actively
Passively utilising received PPLI’s Actively RTT(A) or RTT(B) RTT (A) Dedicated RTT (B) Contention IDLS 2003
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MULTINETTING JTIDS provides the capability to operate simultaneously in up to 127 nets in the same network A terminal can operate (transmit or receive) in only one net in any one time slot but can operate in any net in any time slot as determined by assignment These nets use independent frequency hopping patterns with the net number a variable in determining the hopping pattern IDLS 2003
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MULTINETTING NET 127 NET ... NET 2 NET 1 NET 0 IDLS 2003
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NETWORK PARTICIPATION GROUPS
Previous links, data received and processed if applicable to a platforms role or not NPG’s allow for grouping of J-series messages into a functional role Aids network design IDLS 2003
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NPG’s 13 VOICE GROUP B 19 NON-C2 TO NON-C2 20 NON-C2 TO NON-C2 21 BMD
22 COMPOSITE A 23 COMPOSITE B 27 JOINT NET PPLI 29 RESIDUAL 30 IJMS POSITION & STATUS 31 OTHER IJMS DATA 1 INITIAL ENTRY 2 RTT-A 3 RTT-B 4 NETWORK MANAGEMENT 5 PPLI & STATUS GROUP A 6 PPLI & STATUS GROUP B 7 SURVEILLANCE 8 MISSION MANAGEMENT 9 CONTROL 10 ELECTRONIC WARFARE 12 VOICE GROUP A IDLS 2003
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RELAY UHF LOS Only Paired Slot relay IDLS 2003
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RELAY X Y X Originator Tx in T/S (X) Paired Slots Re-Tx for second Hop
B0 C0 A1 B1 C1 A2 B2 C2 A3 B3 C3 A4 B4 C4 A5 Y The relay platform will re-Tx in the timeslot controlled by the relay delay (6-31). Y is the re-Tx slot, with a relay delay of 6 timeslots X Re-Tx for second Hop by additional relay platform The relay terminal Rx in (X) IDLS 2003
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RELAY Fixed Format and free text Capable of relaying to different nets
No limit to relay hops IDLS 2003
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UK PLATFORMS In Service Future E3D Tornado F3
Nimrod (R) VC10 & Tristar JAPNMS (NMGB) C130 JPC TJF RN (CVS & T42) RN (JPC) GRAP (RA & 16 AAB) Future EFA Typhoon ASTOR MRA (4) T45 GBAD IDLS 2003
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OTHER NATIONS USA (USAF, USN, USMC, US Army) France Germany
Italy Netherlands Norway Belgium Denmark Spain Canada Australia Switzerland Japan and others IDLS 2003
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ANY QUESTIONS IDLS 2003
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