Abstract: A traffic collision avoidance system has a transponder with an interrogation monitoring engine for receiving interrogations and an interrogation response engine for inhibiting responses to the interrogations if the interrogations are air traffic control interrogations and the transponder is in a quiet mode. Typically the transponder enters quiet mode during military formation flight if the aircraft in which the transponder is installed is not a tail or lead member of the formation.

Abstract: A surveillance and collision avoidance system provides a presentation of situational awareness information for display that includes a compound symbol for each target spaced at a distance and bearing relative to a host symbol. The target compound symbol includes indicia of (a) whether the target is airborne or on the ground; (b) whether the target is a civil aircraft, a military aircraft identified as a formation member with the host aircraft, or a military aircraft not identified as a formation member with the host aircraft; (c) whether a ground track for the target is unknown, known by passive surveillance, or known by active surveillance; (d) for civil aircraft, whether the target is the subject of no advisory, a traffic advisory, or a resolution advisory; and (e) for a military aircraft, whether the target is the subject of no encroachment advisory, an unintended encroachment advisory, or an intended encroachment advisory. Subsystems selectively use an active or a passive mode of surveillance.

Abstract: A traffic collision avoidance system has a transponder with an interrogation monitoring engine for receiving interrogations and an interrogation response engine for inhibiting responses to the interrogations if the interrogations are air traffic control interrogations and the transponder is in a quiet mode. Typically the transponder enters quiet mode during military formation flight if the aircraft in which the transponder is installed is not a tail or lead member of the formation.

Abstract: A surveillance and collision avoidance system provides a presentation of situational awareness information for display that includes a compound symbol for each target spaced at a distance and bearing relative to a host symbol. The target compound symbol includes indicia of (a) whether the target is airborne or on the ground; (b) whether the target is a civil aircraft, a military aircraft identified as a formation member with the host aircraft, or a military aircraft not identified as a formation member with the host aircraft; (c) whether a ground track for the target is unknown, known by passive surveillance, or known by active surveillance; (d) for civil aircraft, whether the target is the subject of no advisory, a traffic advisory, or a resolution advisory; and (e) for a military aircraft, whether the target is the subject of no encroachment advisory, an unintended encroachment advisory, or an intended encroachment advisory. Subsystems selectively use an active or a passive mode of surveillance.