Faculty of air transport engineering the department of «air navigation systems»

Airspace Manager Model
In reality, the task of the air zone dispatcher is to provide the required longitudinal distances between aircraft going to land. It is convenient to simulate this aspect within the framework of solving the more general problem of calculating the time of arrival of arriving aircraft in the system. In this case, the following shall be taken into account:
• Scheduled arrival or departure times for aircraft. These values ​​are the input parameters of the model.
• Random deviation of arrival time from the schedule
• Time for which it is necessary to notify the runway manager of the upcoming landing.
At a real airport, the landing manager receives information about the approaching aircraft in advance. This is necessary, in particular, in order to ensure that there are no obstacles on the runway that could interfere with the landing. The value remains constant and is set as the input parameter of the model.
• Time intervals between landing operations in accordance with safety requirements. For this:
- Decision-making on the designation of the aircraft, approaching the landing, the time of access to the pre-landing line in the area of ​​the 4th turn is simulated.
The calculation of these parameters is carried out in such a way as to ensure the given distances between aircraft entering along the glide path depending on their category. These distances are determined for different weather conditions in accordance with the data in table 1.1

	Weather conditions
	Simple	I and II categories of ICAO	ICAO Category III
Longitudinal distances (km)	10	17	26
Time Interval (sec)	120	202	307

Table 1.1. The time interval between aircraft on the pre-landing line, depending on weather conditions

— The requirements are taken into account for the minimum time intervals when landing on one runway or parallel runways, the distance between the axes of which is less than 1000 m. This value depends on the type of aircraft landing at the moment and the type of aircraft landing in front of it (see table 1.2).

We can assume that for each aircraft a value is defined that determines the minimum time interval between the landing of this aircraft and the previous one. This value depends on the type of aircraft landing at the moment, and the type of aircraft landing in front of it.

	For light	For medium	For heavy
Light	60	180	180
Medium	60	60	120
Heavy	60	60	120

Table 1.2. The minimum time interval (sec) between aircraft on the pre-landing line, depending on the class of aircraft

The radar controller provides the necessary time interval between aircraft on the pre-landing line, due to changes in aircraft speeds and maneuvering in the area of the airfield.