The classical Range-Doppler algorithm can't obtain clear ISAR image of a target with rotating parts.In spectrogram, the Micro-Doppler information of the rotor blades is represented as the sinusoidal frequency modulation, whereas the information of main body is depicted as the form of straight lines. So the extraction of Micro-Doppler is transformed to the separation of the sinusoids and straight lines. Based on this idea, a simple method of spectrogram cancellation is proposed, which can quickly achieve the purpose of separation and get clear ISAR image of main body. The effectiveness of the algorithm is proved by the simulation results.
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