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Embedded VMTI Parent Metadata

This cross-layer rule validates that MISB ST 0903 VMTI local sets carried inside MISB ST 0601 Tag 74 have the required parent-packet context available in the surrounding MISB ST 0601 packet.

For each decoded MISB ST 0601 packet that contains Tag 74, the rule checks that the same parent packet also contains:

  • Tag 2: Precision Time Stamp
  • Tag 23: Frame Center Latitude
  • Tag 24: Frame Center Longitude

The test passes when every decoded ST 0601 packet carrying embedded VMTI also carries all three required parent metadata items.

The test fails when a packet contains Tag 74 but omits any of Tag 2, Tag 23, or Tag 24.

This rule is cross-layer because the failure is not inside the VMTI local set itself. The failure comes from the relationship between the nested MISB ST 0903 payload and the parent MISB ST 0601 packet that carries it.