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IRstuff said:...
Moreover, as I stated, there are a variety of existing solutions to co-channel interference, such the pseudo-random number codes used on GPS, or the Tri-Service code used for laser designation systems such as the Apache Target Acquisition and Designation Systems (TADS). As you might imagine, if you fired your Hellfire missile at a target you designated, you wouldn't want it to get distracted by someone else's laser designation for their own Hellfire. Which is why there are hundreds of different codes that Allied forces can use and not interfere with each other. Additionally, the Tri-Service code that the Hellfire uses also has a rolling code that's comparable to garage door opener rolling codes called Pulse Interval Modulation (PIM) codes. There are billions of possible PIM codes. The receiver basically uses a temporal matched filter to look for the code that it's programmed for, and ignores other pulses from other emitters with different codes.