Patent ID: 8102300

Claim:
A secondary surveillance radar comprising: a transmitter configured to transmit interrogations to aircraft airborne in a coverage; a receiver configured to receive signals transmitted from aircraft airborne in the coverage; a reply analyzer configured to analyze a reply responding to an interrogation transmitted from the transmitter, as the reply is detected from signals received by the receiver; a squitter analyzer configured to analyze an extended squitter detected from received Ωvideo signals, among the signals received, as the extended squitter is detected from the signals received by the receiver; a coordinate transformer configured to determine from the extended squitter analyzed by the squitter analyzer a combination of latitude and longitude representing a location of aircraft having transmitted the extended squitter, and transform the combination of latitude and longitude into a coordinate defining the location of aircraft with respect to SSR mode S; and a surveillance processor configured to prepare a target report for surveillance of aircraft in accordance with an analysis result of the reply analyzer and an analysis result of the squitter analyzer.