Prediction of Intermodulation Components for Digital System Simulation.
ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL ALA ADVANCED SENSORS DIRECTORATE
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The purpose of the report is to present and compare approaches to the simulation of traveling wave tube TWT distortion products within a time domain, digital subsystem simulation. Specifically, it will address the problem of specifying the signals to be used in target acquisition studies where a TWT transmitter has been used with multiple, possibly saturated, signals on the input, possibly with second harmonic injection to attempt intermodulation reduction. The problem then may be stated as the following given the signals at the TWT input in terms of modulation, signal level, and carried frequency, what are the levels, frequencies, and modulations of the output signals. It is assumed that sufficient filtering occurs in the system so that only the limited bandwidth 10 percent or so about the desired signal will be considered. This means that such things as output second harmonics and higher will be ignored, while significant intermodulation products of third and possibly fifth order are of highest importance.
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