Abstract
Pulse modulation is of great importance in radar system. The performance of pulse modulated oscillating signal is usually characterized by its phase noise. The phase noise of pulse modulated signal can be hardly measured by phase demodulation. The correlation between the carrier and modulated signal needs to be established for the purpose of noise characterization. In this work, a mathematical form of phase noise of pulse modulated signal was proposed in the frequency domain. After pulse modulation, phase noise distribution of the oscillator shifts and superimposes upon the harmonics of the modulating pulse. Experiments were carried out to verify the phase noise property. The obtained results show that by referring to the phase noise of carrier, the phase noise measured by instrument is in good agreement with the mathematical prediction. The phase noise of pulse width modulated signal can be well depicted by the proposed mathematical form.
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