Abstract: A broadcast device for wirelessly broadcasting information pertaining to a first aircraft includes a positioning device configured to determine a position of the broadcast device. The position comprises a latitude, a longitude, and an altitude. A control unit of the broadcast device is configured to receive this position via an internal bus. Then, the control unit compresses the latitude and the longitude and generates a data packet comprising the compressed latitude, the compressed longitude, the altitude, and an identifier of the broadcast device. Thus, bandwidth is saved compared to broadcasting the uncompressed position. On the receiver side, the compressed longitude and latitude are uncompressed using the principle of locality due to limited radio range. This way, an efficient yet unambiguous collision avoidance system for aircraft with an improved accuracy can be implemented.

Abstract: A broadcast device (10) for wirelessly broadcasting information pertaining to a first aircraft (1) comprises a positioning device (11) configured to determine a position (PI) of the broadcast device (10). The position comprises a latitude, a longitude, and an altitude. A control unit (12) of the broadcast device (10) is configured to receive this position (PI) via an internal bus. Further, the broadcast devices (10) maintains a list of maximum supported foreign protocol versions (VER2_MAX, VER3 MAX) of nearby foreign broadcast devices (20, 30). The control unit (12) then determines a packet protocol version (VER1) of a data packet (D1) which is dynamically depending on these maximum supported foreign protocol versions (VER2_MAX, VER3_MAX). The data packet (D1) is then broadcasted by means of a radio transmitter (13) of the broadcast device (10). Thus, even older foreign broadcast devices can understand at least some of the broadcasted data packets (D1).

Abstract: A broadcast device (10) for wirelessly broadcasting information pertaining to a first aircraft (1) comprises a positioning device (11) configured to determine a position (P1) of the broadcast device (10). The position comprises a latitude, a longitude, and an altitude. A control unit (12) of the broadcast device (10) is configured to receive this position (P1) via an internal bus. Then, the control unit (12) truncates the latitude and the longitude and generates a data packet (DI) based on the truncated latitude, the truncated longitude, the altitude, and an identifier (ID1) of the broadcast device (10). Further, the data packet (D1) comprises a pair c1=(e1, m1) with an exponent (e1) being a natural number and with a mantissa (m1) being a natural number. This pair (c1) is indicative of a value (v1). The data packet (D1) is then wirelessly broadcasted by means of a radio transmitter (13) of the broadcast device (10).