TCAS II Use of ADS-B Surveillance Data through Hybrid Surveillance

摘要

This paper describes a technique that enables TCAN II to use passive sar- veillance data obtained via extended squitter, an implementation of anto- matic dependent surveillance broadcast (ADS-B). The technique, known as hybrid surveillance, is based upon the use of TCAN active surveillance to perform validation of the reported ADS-B position at track acquisition. Aircraft that pass initial validation are maintained on passive surveillance until they become a near threat. At this time, TCAN begins regular active surveillance and thus uses its current surveillance techniques for traffic and resolution advisories. In this way, TCAN is able to use passive extended squitter data while retaining its role as an independent monitor. Simula- tion results show that the use of passive information for non-threatening aircraft results in a significant decrease in TCAN interrogation rate. This enables TCAN to delay or avoid the range reduction that is now required in order for TCAN to remain within its interference budget in high traffic density airspace. Maintaining TCAN operating range in high density air. space enhances TCAN ability to support situational awareness for the flight crew.