DOAs estimation of broadband signals based on a novel multi-channel compressed system

Abstract

This paper proposes a novel multi-channel compressed structure to estimate directions of arrival (DOAs) of broadband signals based on the Nyquist folding structure. This paper firstly proposes a novel multi-channel receiving structure on a long-short baseline interferometer array and analyzes the feasibility of this structure applied in the DOAs estimation of broadband signals. Next, this paper proposes a special frequency estimation algorithm of the input signals under this structure. Finally, the DOAs of signals are estimated by using the long-short baseline interferometer algorithm. Computer simulations show that the proposed algorithm under the novel structure works well and this structure can estimate the DOAs of broadband signals stably when the signal-to-noise ratio (SNR) of the input signals is greater than 0 dB.