For that 180km range, the basic principle is same.
Fire FAAZ towards the target location without locking it, send updates via datalink for path correction, then the IIR camera sees a high-resolution, two-dimensional thermal image.
The missile’s onboard computer runs image-processing algorithms to isolate the aircraft's silhouette from the background sky, clouds, or ground clutter. Once it locks onto that shape, the data link from the launching jet shuts down. The missile is now completely autonomous and locks onto aircraft heat silhouette.
IIR seeker sees the shape of aircraft so unlike AIm-9, it cannot be fooled by flares.