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This paper demonstrates that passive radars can be used to implement signal analysis for frequency modulation (FM) illuminators. In this study, the fast Fourier transform (FFT) is used to acquire the 3D figure of ambiguity function of FM radio signals. According to the principle of radar, this radar waveform has well distinguishing ability for time delay and Doppler frequency shift of signals. Then, the time difference of arrival (TDOA) method is used to estimate the target's position by using an unmanned aerial vehicle to collect data. By this way, the passive radar can detect and locate the targets and doesn't emit electromagnetic waves so that it can avoid being attacked in the war.
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