I think you fail to understand the concept behind it. Stealth lower the target aspect ratio against a background of emissions. Hence, a stealthy, non broadcasting IFF , has to “interrogate” a multitude of potential contact before knowing if it’s even an airborne object of interest. The only way to remain discreet while performing such action, is to do it by comparing known tracks and the monitored source of the signal at the fastest pace possible in order to find the nail in the haystack.
Two philosophy are matching such requirements. Analogical filtering is one of them that Jõ have shown here that is the subject of Russian R&D studies.
Fusion is the drive mean in that. Since a considerable number of calculation have to be made (think about the aspect ratio that change every time you alter even one single of the 6DoF) and due to the scarcity of the source signal (stealth), embedding your sensors into a single processing unit is of a matter of necessity.
Rafale have no built-in sensor fusion that we know aside of Spectra and OSF. Radar data are post processed. An unhappy heritage of the all passive frenzy. OSF has been deleted and replaced by Mica optics, what exclude fusion. TV sensor have sadly also not the range to act has a valid IFF interrogator (once you can see, even with the good sensibility of that sensor, you don’t need an IFF per def).
Hence, as you can guess, it’s not a matter of not researching enough a specific matter here. It’s all about collecting information, readily available to us, as here, and building by logic and intellectual honesty a representative picture of the subject.
As a side note, notice that, when discussing about sensors, nothing is irreversible. Competitive thinking mights turn the outcome rather quickly. Surfacing tech are now about to alter the present state of art.
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