Terminal-Area Aircraft Intent Inference Approach Based on Online Trajectory Clustering

Table 1

Notation and definition of flight attributes.

Notation	Definition	Category	Data
CS	Call sign (CS) is the identification of each flight, such as ABW285 and CAO1023.	Static	Discrete
DA	Destination airport (DA) is divided into several groups based on geographical location of destination airport, such as northeast and southwest.	Static	Discrete
AS	Aircraft size (AS) refers to the wake turbulence category, such as heavy, medium, and light.	Static	Discrete
AC	Aircraft approach category (AC) is defined based on the speed category on the approach phase, such as A, B, C, D, and E.	Static	Discrete
RR	Route relevance (RR) refers to the relation of the connected intended routes.	Dynamic	Discrete
HA	Heading angle (HA) is defined as the angular difference between the aircraft heading direction and the intended routes.	Dynamic	Continuous