System and method for classifying vehicle behaviour

A system for classifying aircraft behaviour, the system comprising:

• at least one sensor for receiving aircraft data from an aircraft which is to be classified;
• and
• a processor which is configured to
• determine whether the received aircraft data comprises identification information for the aircraft,
• in response to a determination that the received aircraft data comprises identification information, use said identification information to classify the behaviour of the aircraft by
• receiving radar data about the aircraft,
• determining a cross-section value for the aircraft from the radar data,
• comparing the determined cross-section value with an expected cross-section value for the type of aircraft, and
• classifying the behaviour as suspicious in response to determining that the determined cross-section value and the expected cross-section value do not match, and
• in response to a determination that the received aircraft data does not comprise any identification information, obtain the position of the aircraft, comparing the obtained position to an expected route for the aircraft, and classifying the behaviour of the aircraft based on the comparison.

A non-transitory computer-readable medium encoded with instructions that when executed by one or more processors cause a process to be carried out for classifying aircraft behaviour, the process comprising:

• receiving aircraft data from an aircraft which is to be classified;
• determining whether the received aircraft data comprises identification information for the aircraft;
• in response to a determination that the received aircraft data comprises identification information, using said identification information to classify the behaviour of the aircraft by
• receiving radar data about the aircraft;
• determining a cross-section value for the aircraft from the radar data;
• comparing the determined cross-section value with an expected cross-section value for the type of aircraft;
• and
• classifying the behaviour as suspicious in response to determining that the determined cross-section value and the expected cross-section value do not match;
• and
• in response to a determination that the received aircraft data does not comprise any identification information, obtaining the position of the aircraft, comparing the obtained position to an expected route for the aircraft, and classifying the behaviour of the aircraft based on the comparison.