Aircraft in flight use a variety of navigation devices to confirm their own positions. When aircraft are flying by instrument flight rules (IFR), the air traffic controller on the ground maintains a safe interval, or separation, between aircraft using radar. Aircraft are also equipped with a Traffic Alert and Collision Avoidance System (TCAS), which informs the pilot when planes approach too closely and a collision is imminent. However, when aircraft are slightly separated, an aircraft itself cannot know where and how other aircraft are flying. If it were possible to understand all of the surrounding conditions, safer flight with a sense of security would be possible.

    To meet this need, ENRI has been conducting research on a technology called Automatic Dependent Surveillance Broadcast (ADS-B) which enables aircraft to know each others' positions. In addition to this, ENRI has been carrying out research on technologies such as Traffic Information Service Broadcast (TIS-B), in which information necessary for safety, such as aircraft traffic conditions, etc., is transmitted automatically from the ground and received and displayed on the aircraft, among others.