Inherited Properties Feature or Interest

Figure 26: UML model of DwellArea The DwellArea is defined by its center point, the dwellAngleHalfExtent, and the rangeHalfExtent. The center point aggregates the GMTI segment fields D24 and D25, namely Dwell Area – Center Latitude and Dwell Area – Center Longitude, whereas the dwellAngleHalfExtent and the rangeHalfExtentare direct mappings from the GMTI fields D26 and D27. The following table illustrates the mapping. Table 10: Dwell Area STANAG to UML mapping 4607 Field Name 4607 Form UML Type Center Latitude SA32 GM_Point Center Longitude SA32 Range Half Extent BA16 Measure Dwell Angle Half Extent BA16 Measure If possible, GMTI defines values ranges and units for all elements. Those ranges cannot be expressed in derived OM schemas, but need to be provided using further constraint expression mechanisms. In this report, we used UML constraints to highlight this aspect.

8.4.5 Procedure

The GMTIProcess aggregates information describing the platform, the sensorand the capabilities of the sensor. In GMTI, this information is part of the Dwell segment. Figure 27: UML model of GMTIProcess GMTIProcess provides a direct mapping of the platform and sensor properties from the Dwell segment. To allow providing uncertainty information, most elements have been mapped to swe:Quantity elements. This approach has been chosen to highlight the potential mapping to core SWE types. Alone the sensor position has been mapped to GM_Point to aggregate connected GMTI fields. A number of constraints apply. Not all constraints have been listed here to improve readability. The constraints not illustrated in the figure above mainly address value range and unit constraints.

8.5 Situation Awareness Observation

The SituationAwarenessObservation is the simplest of all three GMTI observation specializations. It binds the feature of interest, the procedure, and the result information to provide the minimum data required for Moving Target Indicator MTI target display see clause 8.3.2.