Automatic Link Establishment (3G ALE ARCS)

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2G ALE - 3G ALEAutomatic Link Establishment - ALE-400
Automatic Link Establishment (3G ALEAutomatic Link Establishment ARCSAutomatic Radio Control System)
3Gale.jpg
Frequencies 3 MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
,30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
3,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
30,000 kHzKiloHertz (kHz) 10^3 Hz
30 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
- 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation PSKPhase-Shift Keying
ACFAutoCorrelation Function BW3 (LDL): 13.3 msmilliseconds (.001 of a second). All others: N/A
Bandwidth 3000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).kHzKiloHertz (kHz) 10^3 Hz
0.003 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.003 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.003 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description 3G ALEAutomatic Link Establishment (ARCSAutomatic Radio Control System) is the next generation of ALEAutomatic Link Establishment (Designated by MIL-STD-188-141B (Appendix C)). Also known as STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4538, although MIL 188-141 does not provide Fast LSU.
I/Q Raw Recording
Audio Sample
3G ALEAutomatic Link Establishment (ARCSAutomatic Radio Control System) is the next generation of ALEAutomatic Link Establishment (Designated by MIL-STD-188-141B (Appendix C)). Also known as STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO). 4538, although MIL 188-141 does not provide Fast LSU.

Although 3G ALEAutomatic Link Establishment is more reliable and has significantly enhanced channel-time efficiency, the existence of a large installed base of 2G ALE radio systems and the wide availability of moderately priced (often military surplus) equipment, has made 2G the baseline standard for global interoperability.[1]

Features[edit]

Improvements over 2G ALE:

  • Faster link establishment
  • Linking at lower SNR
  • Improved channel efficiency
  • ALEAutomatic Link Establishment and data traffic use the same family of waveforms
  • Higher throughput for short and long data messages
  • Better support for Internet protocols and application


New features in 3G ALEAutomatic Link Establishment:

  • Burst PSKPhase-Shift Keying waveforms
  • Synchronous scanning of calling channels
  • Partitioning of stations into dwell groups
  • Multi-slot channel access using call priorities
  • Carrier sense multiple access with collision avoidance (CSMA/CA) channel access procedure

Source

Waveforms[edit]

This mode employs 5 constituent burst waveforms BW0 to BW4 for the various kinds of signaling required in the system, so as to meet their distinctive requirements as to payload, duration, time synchronization, and acquisition and demodulation performance in the presence of noise, fading, and multi-path. All of the burst waveforms use the basic 8-ary PSKPhase-Shift Keying serial tone modulation of an 1800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). carrier at 2400 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. The same modulation is used in MIL-188-110A serial mode.


Waveforms
Waveform Description Burst Duration Preamble Payload
BW0 Used for 3G-ALEAutomatic Link Establishment PDUs (Protocol Data Unit) 613.333 msmilliseconds (.001 of a second) 160.0 msmilliseconds (.001 of a second) 26 bits
BW1 Used for traffic management PDUs and HDL (High-rate Data Link Protocol) acknowledgement PDUs 1.30667 sec 240.0 msmilliseconds (.001 of a second) 48 bits
BW2 Used for HDL traffic data PDUs 640 msmilliseconds (.001 of a second) + n*400 msmilliseconds (.001 of a second)
n = 3, 6, 12, or 24
26.67 msmilliseconds (.001 of a second) 1881*n bits
n = 3, 6, 12, or 24
BW3 Used for LDL (Low-rate Data Link Protocol) traffic data PDUs 373.33 msmilliseconds (.001 of a second) + n*13.33 msmilliseconds (.001 of a second)
n = 64, 128, 256, or 512
266.67 msmilliseconds (.001 of a second) 8*n + 25 bits
n = 64, 128, 256, or 512
BW4 Used for LDL acknowledgement PDUs 640.0 msmilliseconds (.001 of a second) None 2 bits

Samples[edit]

BW2 BW3 BW4
BW2.jpg
BW3.jpg
BW4.jpg

Additional Links[edit]

Additional Images[edit]