ADS-B Surveillance Quality Indicators: Their Relationship to System Operational Capability and Aircraft Separation Standards

摘要

Use of Automatic Dependent Surveillance-Broadcast (ADS-B) data for support of aircraft separation is examined on the basis of a Close Approach Probability (CAP) model previously used for determination of radar based minimum separation standards. A central concern in this treatment relates to the integrity of the GPS derived position estimates reported by ADS-B, and how undetected failures in GPS integrity monitoring affect safe separation requirements. A review of the GPS integrity monitoring concept shows the relationship between the probability of missed detection of an error and the false detection rate, and how the resulting factors influence overall system performance. Comparisons of ADS-B based and radar based surveillance are then made. These comparisons indicate the adequacy of ADS-B for separation maintenance. During the transition to full ADS-B equipage, ground based radar estimates on unequipped targets will be up-linked to ADS-B equipped aircraft in a concept termed Traffic Information Service-Broadcast (TIS-B). Application of the model to TIS-B again shows ADS-B supports separation services under very conservative assumptions.