JDN

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JDN, abbreviation:

  • Julian Day Number, or short Julian day, astronomical day counting system.
  • Joint Data Network. A collection of near-real-time communications and information systems used primarily at the coordination and execution level. It provides information exchange necessary to facilitate the Joint/Service Battle Manager’s comprehension of the tactical situation, and also provides the means to exercise command and control beyond the range of organic sensors. The JDN carries near-real-time tracks, unit status information, engagement status and coordination data, and force orders. JDN information is used to cue radars as well. The backbone of the JDN is Link-16. However, other data links such as Link-11, Link-22, IBS (Integrated Broadcast Services), and VMF (Variable Message Format) enable information exchange with the JDN through gateways at various platforms to ensure that disadvantaged users are included in the JDN. Satellites link geographically dispersed users in near real-time without consuming limited tactical bandwidth.
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