simultaneous: adj.同时发生的，同时做的，同时的 (with)。 simultaneous development of heavy and light industries 重工业和轻工业同时并举。 simultaneous broadcast 【无线电】联(合广)播。adv.-ly 同时，一齐。
5 . a computationally attractive algorithm based on the propagator method is proposed for simultaneous estimation of the direction - of - arrivals and frequencies of multiple narrowband signals received at spatially separated sensors . the frequencies are found by the eigenvalues of a constructed lower dimension matrice . the arrival angles are then estimated using the associated eigenvectors as well the estimated frequencies 在第六章基于传播算子方法给出了频率、角度联合估计的一种快速算法，由于其避免了高维矩阵的特征分解，因而具有更低的计算复杂度，且算法适用于一般的阵列结构，二维参数自动配对，易于实时实现。
