All Anti-Radiation Missiles [ARMs] can be assigned a specific sensor target. With respect to selection of sensor for destruction, that is more difficult.
If you look in the PlayersDB while playing, you can select a unit such as the BCGN Kirov and then hit the Database function. Once the unit appears, you can select the Sensors button to show the various sensors aboard that unit.
Under the sensors shown, you can select the Top Dome radar and a text description appears:
"SA-N-6 missile guidance group"
Unfortunately, not all radar systems have text like this written for them. The only way to know which sensor is assigned to which weapon is through experience or use of the database editor, at this time.