The innovations of this thesis are as the follows : 1 ) it is analyzed that the lower - order jacobi - anger expansion model for an incoherently distributed source has better accuracy performance than some other approximate source models such as space frequency model , two - point source model , and low - rank approximate model . using the parametric decoupling property of the ja - based model , a novel angular parameter estimator is proposed , which is very robust in case of large angular spreading 本文從這三個方面開展了空間分布源波達方向估計研究,創新點包括: 1 )分析了低階jacobi - anger級數展開近似模型的誤差性能;利用該近似模型的參數解耦特性,提出了一種新的波達方向估計器,在大角度擴展條件下,該估計器表現非常穩健。