Try to use some UAV (High ECM and little size), they have greater chance to avoid this kind of nasty boy. Repeat the reccon flight again and again until you run out of UAV (worst case) or they run out of ammo (
).
The manpad are relatively easy to spot (smoke on the shooting area), so use mortar to suppress or kill them between each flight.
Of course you could use the old russian method and crush wide areas under massive artillery barrage but the counter fire could be painfull, specialy against well equiped and trained country like Sweeden
.