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| 1 | Accurate single-observer passive coherent location estimation based on TDOA and DOA显示文摘This paper investigates the problem of target position estimation with a single-observer passive coherent location(PCL) system. An approach that combines angle with time difference of arrival(ATDOA) is used to estimate the location of a target. Compared with the TDOA-only method which needs two steps, the proposed method estimates the target position more directly. The constrained total least squares(CTLS) technique is applied in this approach. It achieves the Cramer–Rao lower bound(CRLB) when the parameter measurements are subject to small Gaussian-distributed errors. Performance analysis and the CRLB of this approach are also studied. Theory verifies that the ATDOA method gets a lower CRLB than the TDOA-only method with the same TDOA measuring error. It can also be seen that the position of the target affects estimating precision.At the same time, the locations of transmitters affect the precision and its gradient direction.Compared with the TDOA, the ATDOA method can obtain more precise target position estimation.Furthermore, the proposed method accomplishes target position estimation with a single transmitter,while the TDOA-only method needs at least four transmitters to get the target position. Furthermore,the transmitters' position errors also affect precision of estimation regularly. | Li Jing Zhao Yongjun Li Donghai | 2014 | Chinese Journal of Aeronautics2014，27，4： | 23 |
| 2 | 稀疏极化敏感阵列的波达方向和极化参数联合估计显示文摘该文采用稀疏分布极化敏感阵列(SD-PSA),研究了多目标波达方向(DOA)和极化参数的估计问题。首先建立稀疏极化敏感阵列信号模型;然后利用阵列的空间旋转不变性运用ESPRIT算法得出信号的高精度周期性模糊多值DOA估计;同时利用子阵列导向矢量之间的关系得出信号的极化信息和DOA的无模糊粗估计;最后利用DOA粗估计值解模糊,得到信号的高精度无模糊DOA估计。该文所提阵列的阵元间距大于半个波长距离,扩展了阵列2维物理孔径,一定程度上降低了阵元间的互耦影响,相应的信号DOA估计精度大大提高。仿真实验结果验证了该算法对信号DOA和极化参数估计的有效性。 | 司伟建 周炯赛 曲志昱 | 2016 | 电子与信息学报2016，38，5： | 7 |
| 3 | 基于Hermitian矩阵的特征分解算法显示文摘研究了基于多重信号分类(MUSIC)算法的特征分解算法,即关于Hermitian矩阵的特征分解.该算法的运算过程均是对低阶矩阵进行运算,并且其中将复数运算转化成了实数运算,不仅降低了运算的复杂度,而且所得到的特征值精度较高.该算法的此特性使得其易于在数字信号处理器(DSP)中实现,应用于实际工程中具有较高的实时性.通过计算机仿真实验以及DSP实现验证了本算法的有效性以及实时性. | 曾富红 司伟建 曲志昱 | 2016 | 沈阳大学学报(自然科学版)2016，28，6： | 3 |
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