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How does one jam GPS anyway?
civilian GPS operates at a few fixed frequencies like 1575.42 MHz, 1227.60 MHz, and L5 at 1176.45 MHz (plus 2-3 more; military GPS is a different story). The structure of the GPS data is also fairly well known; all of this is easy to find on the goog.
So you hop on the same frequency start spamming bad GPS data. wrong time stamps, wrong satellite info, etc. with a little effort you can convince a long range missile they're off by 2 miles and should veer left hard.
or you just put a shit ton of noise on the same frequencies and make it so it's forced to use inertial navigation (which isn't very accurate).
Making lots of fake GPS signals, or just pushing lots of power on a GPS frequency.