In allusion to non-stationary wideband LFM signals, an algorithm of direction-of-arrival (DOA) estimation based on fractional Fourier transform (FRFT) is proposed. In this method, the observed signals are first transformed to fractional Fourier (FRF) domain, and by the unique concentration signature of signal, the FRF domain steering vector is defined, then, in the corresponding FRF domain, the two-dimension (2-D) angles estimating of the LFM signal is implemented by using DOA matrix algorithm. Theoretical analyses and simulation results show that, this algorithm can obtain good angle estimation performance with a low computation complexity.
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