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Field Dependencies

This semantic rule validates MISB ST 0601 dependency checks between related fields inside the same packet.

What This Test Does​

The rule checks semantic relationships such as:

  • paired geospatial tags that must appear together, such as latitude and longitude pairs
  • elevation fields that require their corresponding base location pair
  • Tag 122 country-code content versus the declared coding method
  • Tag 102 SDCC pack consistency
  • Tag 138 payload counts versus the number of payload records present

✅ Pass Criteria​

The test passes when all decoded MISB ST 0601 packets satisfy the required semantic dependencies between related fields.

❌ Fail Criteria​

The test fails when a dependent MISB ST 0601 field is missing required companion fields, uses an incompatible coding method, or encodes an internally inconsistent composite structure.

Notes​

This rule covers packet-level semantic consistency, not long-term timing behavior. Timestamp and cadence checks remain covered by the temporal rules.