Study of the frequency domain interference method for chirp measurement

Frequency domain interference between a transform-limited pulse and a chirped pulse (FDITPCP) for measuring the chirp characteristics of linearly chirped pulse is studied, especially its applicability and stability. It is theoretically demonstrated that the FDITPCP method is applicable to pulses of complex waveforms. And this method is more accurate when measuring large chirps. Furthermore, if a chirp is introduced into the transform-limited pulse, the effects on the measurement results are analytically known, which is confirmed by simulation, and can be ignored when the introduced chirp is much smaller than that of the chirped pulse.