DOA estimation of multipath signals in the presence of gain-phase errors using an auxiliary source

Authors：Wang, Zhangsheng; Xie, Wei^*; Wan, Qun

Source：IEEJ Transactions on Electrical and Electronic Engineering, 2019, 14(7): 1114-1121.

DOI：10.1002/tee.22907

• direction-of-arrival estimation
• uniform rectangular array
• multipath propagation
• coherent signals
• sensor gain-phase uncertainties

In this paper, we address the problem of direction-of-arrival (DOA) estimation of multipath signals in the presence of gain-phase uncertainties using an auxiliary source (AS) with uniform rectangular array. Based on the assumption that the waveform of the AS is a known prior, and the signal of the AS impinges on the array without multipath propagation, a two-step algorithm is proposed to estimate the DOAs along with the fading coefficients and gain-phase errors. First, a coarse estimation is obtained by extending the traditional spatial smoothing-based ESPRIT algorithm. Second, in order to overcome the performance deterioration due to a reduction of the effective array aperture, an alternate iterative algorithm is proposed. Meanwhile, the relevant stochastic Cramer-Rao bound (CRB) is also derived. Simulation results show that the proposed method is capable of approaching the stochastic CRB when the signal-noise ratio (SNR) of the AS is large enough and is greater than the SNR of the unknown source.

• Institution
  电子科技大学