arrival unknown 中文意思是什麼
arrival unknown
解釋
臨時來住店客人-
Based on fourth - order cumulant, a computationally efficient method for joint estimating both directions of arrival and ranges of near field sources with known carrier frequency is firstly presented. the proposed algorithm need not any spectral peak searching and the 2 - d parameters are automatically paired. lt is suitable for arbitrary additive gaussian noise environment. in the following section, a 3 - d esprit method for jointly estimating of frequencies, doa ' s and ranges of multiple near - field sources with unknown carrier frequencies is proposed. the parameters estimation are given by the eigenvalues of different matrices. furthermore, its performances are confirmed by several computer simulations
利用四階累積量，第五章首先給出了一種載頻已知的情況下基於近場源的距離和波達方向聯合估計演算法，通過構造的陣列輸出信號四階累量矩陣使空間信號到達方向和距離估計無需譜峰搜索，且參數自動配對，適合於任意高斯噪聲環境。進一步在第三節提出了一種載頻未知的情況下的多個近場窄帶信號源doa 、距離和頻率聯合估計的3 - desprit演算法。 -
Their exact origin is unknown, but they predate the arrival of missionaries to china, and speak eloquently of the message which motivated daddy to devote his life to serving the people of china
他們確切的籍貫無從查考，但他們把到中國的傳教之旅提前了，他們巧舌如簧地傳遞著信息，促使父親從此把畢生精力致力於在中國向人們傳教。
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