Progress of ADS-B IN technology in civil aviation applications

ADS-B technology is one of the critical surveillance technologies identified by ICAO for the future and one of the four main directions that the China Civil Aviation New Technology Application and Development Committee has focused on shortly. According to the direction of aircraft data transmission, the airborne ADS-B application functions can be divided into OUT and IN categories. ADS-B IN means that the aircraft can receive ADS-B OUT information sent by other aircraft to provide operational support or information sent by ground station equipment to provide operational support to the pilot. ADS-B IN technology enables aircraft to receive ADS-B information from surrounding aircraft, achieve traffic situation awareness, and implement “TCAS-like” functions applicable to general aviation flight characteristics to improve general aviation flight safety further. This paper provides an in-depth analysis of the current status of international ADS-B IN technology development, discusses in detail the update of relevant policies and regulations of Chinese civil aviation and the progress of demonstration and validation, and analyzes the main problems existing in actual operation.