Analysis of Alerting Criteria and DAA Sensor Requirements in Terminal Area

In this paper, DAA Well Clear (DWC) standards suitable for the terminal area are analyzed using Automatic Dependent Surveillance-Broadcast (ADS-B) data received in the Republic of Korea. A route-finding algorithm was developed to remove the controller intervention portion from the recorded trajectory. The analyses were performed using 100 days of data processed through the route-finding algorithm. It is discovered that the previously proposed DWC thresholds for terminal areas are also applicable to the Korean National Airspace. By applying these criteria, DAA sensor requirements are investigated. Regardless of the required detection rate, the azimuth limit of ±90° is sufficient, which is smaller than the limits proposed by DAA-MOPS. This is likely to be caused by the operations being tightly restricted by jet routes and instrument flight procedures. The tradeoff between sensor elevation limit and range limit can be observed. For a fixed detection rate, minimum elevation limit, minimum range limit, and optimal elevation and range limits are presented.