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The direction of arrival (DOA) estimation of wideband chirp signal is studied in this paper. The wideband chirp signal becomes a short pulse which is approximated by a sinc function with the use of matched filter. Based on the covariance matrix of the sinc function, the proposed method constructs a new signal model in which the steering vector is independent of the frequency and depends only on the DOAs of incident signals. Then existing narrowband DOA estimation methods can be applied to estimate wideband chirp signals DOA. Simulation results demonstrate that the proposed algorithm shows superior performance in DOA estimation of the wideband chirp sources.
Inspec keywords: covariance matrices; direction-of-arrival estimation; array signal processing
Subjects: Signal processing theory; Interpolation and function approximation (numerical analysis); Signal processing and detection