Aircraft collision avoidance method and device

A receiver device comprising:

• a radio receiver configured to receive a foreign data packet, the foreign data packet being indicative of information pertaining to a second aircraft,
• wherein the foreign data packet comprises foreign compressed position data, wherein the foreign compressed position data comprises compressed foreign latitude data and compressed foreign longitude data, wherein a bit width of the foreign compressed position data is smaller than a bit width of foreign position data being indicative of a position of the foreign broadcast device,
• wherein the receiver device further comprises
• a control unit configured to:
• receive position data indicative of a position of the receiver device, wherein the position data comprises latitude data indicative of a latitude of the receiver device (404 and longitude data indicative of a longitude of the receiver device,
• receive the foreign data packet as received by the radio receiver, and
• uncompress and disambiguate the foreign compressed position data using the position data to reconstruct the foreign position data
• wherein the receiver device is configured to, for uncompressing the foreign compressed position data using the position data to reconstruct the foreign position data:
• uncompress foreign latitude data from the received compressed foreign latitude data using the latitude data,
• determine a longitude resolution divider using the foreign latitude data, and
• uncompress foreign longitude data from the received compressed foreign longitude data using the determined longitude resolution divider and the longitude data.

A method for, by means of a broadcast device wirelessly broadcasting information pertaining to a first aircraft, the method comprising steps of:

• providing the broadcast device comprising a positioning device, a control unit, and a radio transmitter,
• by means of the positioning device determining position data indicative of a position of the broadcast device, wherein the position data comprises latitude data indicative of a latitude of the broadcast device and longitude data indicative of a longitude of the broadcast device,
• by means of the control unit:
• receiving the position data as determined by the positioning device,
• determining compressed position data by performing a scaling operation for rescaling, a rounding operation for rounding, and a gridding operation for projecting the scaled and rounded position data onto a grid such that the compressed position data retains position only relative to an origin of a respective grid cell on at least one of the latitude data and the longitude data, wherein a compressed bit width of the compressed position data is smaller than a bit width of the position data, and
• generating a data packet comprising the compressed position data and an identifier of the broadcast device, and
• wherein the method comprises further steps of:
• by means of the radio transmitter receiving the generated data packet and wirelessly broadcasting the received data packet,
• wherein the broadcasted data packet is indicative of the to-be-broadcasted information, and
• wherein the method comprises further steps of
• performing the scaling operation on the latitude data using a latitude resolution divider and performing the gridding operation on the latitude data using a latitude modulus on the outcome of said scaling operation such that the latitude data is compressed to obtain the compressed latitude data, wherein
• PD
• ⁢
• 1
• ′
• ⁢
• _LAT
• =
• (
• PD1_LAT
• +
• D_LAT
• 2
• )
• D_LAT
• ⁢
• mod
• ⁢
• m_LAT
• where PD1_LAT is latitude data. PD1′_LAT is the compressed latitude data. D_LAT is the latitude resolution divider, m_LAT is the latitude modulus, and mod is the modulo operator, and
• performing the scaling operation on the longitude data using a longitude resolution divider and performing the gridding operation on the longitude data using a longitude modulus on the outcome of said scaling operation such that the longitude data is compressed to obtain the compressed longitude data, wherein
• PD
• ⁢
• 1
• ′
• ⁢
• _LON
• =
• (
• PD1_LON
• +
• D_LON
• 2
• )
• D_LON
• ⁢
• mod
• ⁢
• m_LON
• where PD1_LON is the longitude data, PD1′_LON is the compressed longitude data, D_LON is the longitude resolution divider, m_LON is the longitude modulus, and mod is the modulo operator.