Xiao Chen Jingmin Xin Nanning Zheng 0001 Akira Sano Direction-of-arrival estimation of coherent narrowband signals with arbitrary linear array. 1-5 2017 SiPS https://doi.org/10.1109/SiPS.2017.8109984 conf/sips/2017 db/conf/sips/sips2017.html#ChenXZS17