Abstract
AbstractThe automatic dependent surveillance (ADS) system has been developed and tested through flight trials using INMARSAT satellites. ADS is a new surveillance system that uses a satellite datalink for aircraft in oceanic areas. Test results showed that the ADS transmission protocol is reliable and message losses are very few, the transmission delay for the R channel is about 3.4 s and that for the T channel is 15.6 s under fair link conditions. The latter should be reduced for additional improvement in surveillance capability in the future. It may increase due to degradation of link condition by aircraft attitude change.
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