What is the fundamental concept of Mode S ELS?
The fundamental concept of Mode S ELS is the assignment to each aircraft of a unique ICAO 24-bit address by the State Registration Authority. Mode S ELS uses this unique 24-bit aircraft address for selective interrogation and to acquire downlinked Aircraft Identification (commonly referred to as Flight ID). Among other attributes associated with Mode S ELS is the ability to acquire altitude in 25 foot increments.
