U need to update yr info. Currently, guidance is based on an imaging infra-red (IIR) passive seeker that ensures a high-hit accuracy in both top- and front-attack modes. mmW seeker, on the other hand, is intended to operate as an optional system that can replace the IIR passive seeker as a module...
Stop giving me lecture from wikipedia boy.All your source is wiki.It's you who should update his knowledge,not me.There was a thread in pdf named 'DRDO chief Dr VK Saraswat annual address,some pleasant surprises'(courtesy-ganimi kawa).There the picture of the mmw seeker was displayed.So it's already has been developed.