Navigation data resource availability of ADS-B

The surveillance data sources for the automatic dependent surveillance-broadcast (ADS-B) provided by airborne navigation systems have crucial effect on ADS-B surveillance performance. Based on the accuracy and integrity quality evaluation indexes of ADS-B navigation data and the global positioning system (GPS), this paper makes a thorough research on the availability of ADS-B navigation data source, the factors related to accuracy and integrity of ADS-B are derived and simulated, which include the position estimated uncertainty (EPU) and horizontal position integrity containing radius (Rc), and it is the first to give the quality index category of the ADS-B horizontal data source in Tianjin. The simulation results show that the navigation accuracy category for position (NACp) and navigation integrity category (NIC) meet the lowest requirements recommended by the civil aviation administration of China (CAAC) in the probability of 100% and 99.65% respectively for the ADS-B navigation data in Tianjin. The results derived from this paper provide the theoretic support for the implementation of ADS-B in Tianjin Binhai international airport and other areas of China.