In order to prevent the occurrence of accidents during flying aircraft are in the air to prevent the accident occurred between the powerful aircraft against ground-based obstacles so that air traffic is fast and secure.
To prevent accidents between aircraft flying in the air. , to prevent accidents between aircraft and ground obstacles. , so that air traffic is convenient, fast and safe.
in order to prevent the accidents during the aircraft flying in the air, to prevent accidents between aircraft and ground barrier to make air traffic is convenience Quick and safe