I dont understand this yet. GPS allows us to navigate, based on the timing of signals from several satellites. GPS jamming would involve flooding the relevant

I dont understand this yet. GPS allows us to navigate, based on the timing of signals from several satellites. GPS jamming would involve flooding the relevant frequecies with noise, or somehow making it harder to acquire the signals? How does creating a more accurate clock at the GPS receiving end help That sounds like the jamming interferes with the speed fo the signals from the satellites which I dont think it likely?