A Novel Correlative Interferometer Technique with Multi-Sample Diversity for Finding Direction of Satellites.

A precise direction-finding technique is required even in low signal-to-noise ratio (SNR) regimes for wireless positioning applications using commercial satellites. In this paper, we propose a novel correlative interferometer (CI) technique that accurately estimates the direction-of-arrival (DoA) of multiple satellite signals incident on an array antenna by exploiting multiple time samples. The basic idea of the proposed technique is to jointly exploit multiple time samples of the received satellite signal in estimating DoAs under the presence of additive noise. The proposed CI technique can be regarded as a generalized version of the conventional CI technique since it reduces to the conventional CI technique when it applies to the case of a single time sample. Through computer simulations, we show that the proposed CI technique significantly outperforms the conventional CI and the multiple signal classification (MUSIC) techniques in terms of DoA estimation even in the low SNR regime.