At $100K a pop a even a mid range CCD sensor seems to too pricey, the size of the missile also precludes any cryogenically cooled IR sensor or an active radar array and since they can hit a target as small as a larger mortar even passive radar sensing seem to be nearly impossible to achieve.
Day and night also seems to have no impact on the performance of the system if anything it seems to have slightly higher interception rates at night and since the rockets it intercepts are in their ballistic stage it can’t even use heat seeking to intercepts its targets.
It hits targets as small as 1.5M in length and 15-20cm in diameter so the overall cross section for the target lock is tiny.
The politics aside I can’t think of a single missile system that can even compete with this level of performance even at orders of magnitude higher costs.
I’m actually surprised that the US hasn’t bought and installed a battery on every single warship it has since the system can also intercept anti ship missiles and even combat aircraft at short ranges.