How the AI plots arty/air strikes ?

[iCaMpWiThAWP]

I was playing a battle, and in the pre-game bombardment i've been hit by some air strikes and naval guns, they were too accurate for a pre game bombardment, 5 strafing planes came in, 3 attacked bunkers, 1 attacked my panthers, and another 1 my arty park, then 8 inch guns bombarded my infantry, again with surgical precision, then i set up a test, bought a few air strikes, and arty for the AI, and a few tanks, bunkers and guns for me, i place them in random, places, into dense woods and behind a hill, when the bombardment came in, howitzers obliterated my arty and AA park, air strikes cam in and attacked all my hidden and ramdomly placed units, ran the test 10 times, 7 out of 10, they were surgicaly accurate, only 3 times during the test they were random, so my conlcusion was that the AI knew where my units were, and my question is How the AI plots arty/air strikes ? "Cheating"?