Abstract: An improved bracket decoder apparatus including an enhanced bracket decoder ortion and a regenerative bracket decoder portion operates to generate enhanced bracket decode signals and regenerative bracket decode signals. The foregoing combination of decoder portions will allow digital display systems which use IFF information to detect all targets that are replying regardless of the IFF train spacing, even overlapping replies. The enhanced bracket decoder portion of the apparatus can be operated alone to detect all reply conditions except the one of overlapping replies. The apparatus is configured to provide presently used signals also, i.e., the bracket decode, the degarbled bracket decode, and the range and code information for each video reply.

Abstract: A converter, according to the present invention, operates to convert pertnt IFF data which is in a digital format to an IFF composite video format. The converter is configured to interface with conventional plan-position indicators (PPIs) and decoders.

Abstract: A 360.degree. IFF video resynchronizer unit for storing pertinent data such s the range, the code, the IFF mode and the azimuth for each reply from associated transponders is disclosed. The 360.degree. IFF video resynchronizer unit is also configured for interfacing with one of a plurality of interrogator subsystems associated with a plurality of radar systems having multiple antennas so as to backup any one of the plurality of interrogator subsystems with a single 360.degree. IFF video resynchronizer unit. In addition, any number of the plurality of interrogator subsystems can be replaced with a single 360.degree. IFF video resynchronizer unit when at least one of the plurality of interrogator subsystems is present.