What frequency is the carrier waveform? What you have is an AM wave form, to recover the modulation, you need a circuit that is fast enough to follow and detect the carrier, but then follow it with a filter to reject the carrier components. With such a huge p-p signal I would have thought that a simple diode rectifier would do, followed by an op-amp to balance out the DC component and to changing the scaling to something meaningful, filtering out the carrier components.
Frank