Abstract
In this paper, a new switch-based multi-polarised receiver architecture and two compatible Direction-of-Arrival (DOA) estimation algorithms are proposed for the partially polarised signals. In the receiver, each polarised element in an antenna is connected to a common Radio Frequency (RF) chain via a switch, which reduces the number of RF chains. For DOA estimation, an ESPRIT-based algorithm and a joint annihilation-based algorithm are proposed. The ESPRIT-based algorithm is based on summing the covariance matrices of different polarised outputs, and the joint annihilation-based algorithm is based on annihilating different polarised outputs by a common filter. Compared with other algorithms, the ESPRIT-based algorithm, which only takes about 91 us to perform one estimation, is more efficient and the joint annihilation-based algorithm, which can approach the Cramer-Rao Lower Bound (CRLB), is more accurate. It is also concluded that the tri-polarised Uniform Linear Array (ULA) can offer more accurate estimation than the dual-polarised ULA.
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