共查询到19条相似文献,搜索用时 484 毫秒
1.
本文给出了基于Gram-Schmidt正交化方法的超分辨算法,并分析了该算法对阵列幅度和相位误差的灵敏度.给出了两个目标、不同阵元数和不同阵元间距等情况下的灵敏度计算结果。结果表明,本文的算法在目标小角度间隔、大阵元数的情况下,受幅相误差的影响没有最大似然估计(MLM)和MUSIC算法敏感。 相似文献
2.
3.
方位角估计是估计空间目标的空间位置的一项重要工作。文中利用基本MUSIC算法和ROOT-MUSIC算法进行方位角估计的对比研究。针对不同信噪比情况下,用这两种算法估计方位角的估计效果进行对比研究;对算法估计同一个方位角时的估计均方误差进行MATLAB仿真分析。通过对比研究,验证了基于MUSIC算法的方位角估计在信噪比较小时,估计性能差,以至于难以分辨多个信号的方位角。 相似文献
4.
5.
6.
7.
8.
为了提高图像分割的质量,采用2维最大熵最佳阈值方法,首先通过灰度区域确定该域像素的2维随机向量,在准则函数下求得到2维最大熵最佳阈值;接着通过递推优化对2维最大熵最佳阈值计算数据优化处理,减少重复性数据计算量;最后通过分割图像区域与原目标空间位置的互信息量最大准则,把误分割误差函数作为检测分割标准,给出了算法流程;并仿真出了不同算法的图像分割结果。结果表明,该算法得到图像分割的精度较高,没有背景与噪声的残留,保留了图像信息,执行速度快、分割效果视觉好、误分割误差最小。这对提升图像分割效率是有帮助的。 相似文献
9.
10.
11.
高频地波雷达(HFSWR)使用多重信号分类算法MUSIC 算法估计信号源的到达角时,接收通道幅相特性的不一致会使MUSIC 算法的分辨性能下降,甚至完全失效。文中针对单极子/ 交叉环天线提出一种基于海洋回波的相位校正方法:首先,预选出一阶谱区的大信噪比谱点;然后,结合天线三通道相位中心一致的特性进行有效谱点的筛选;最后,利用有效谱点的相位差均值估计出相位误差。将该方法应用于北部湾海域收集的实测数据处理中,验证了方法的有效性。 相似文献
12.
13.
Su Weimin Gu Hong Ni Jinlin Liu Guosui Zhang Guangyi 《电子科学学刊(英文版)》1998,15(3):226-232
This paper presents the performance analysis of the MUSIC algorithm in the presence of channel amplitude and phase Error. Theoretical expression for the error of DOA estimating with MUSIC algorithm and Cramer-Rao bound are derived. It is compared with simulations performed for some representative cases. The results of theoretical expression and simulation show that existence of these errors will increase the error of DOA estimating and degrade its performance. 相似文献
14.
15.
16.
Direction-of-arrival (DOA) estimation is a central problem in array processing and has a variety of applications. In this paper, a new algorithm for finding DOAs of multiple temporally correlated signals is devised. The proposed approach is based on the joint diagonalization structure of a set of spatio-temporal correlation matrices. Unlike the subspace-based DOA estimators, it is not necessary to estimate the noise or signal subspace explicitly. Moreover, the proposed method can provide the spatial spectrum and estimate the DOAs even when the number of sources is not known a priori. Interestingly, it is revealed that the well-known MUSIC method is a special case of our algorithm. Simulation results validate that the developed approach is superior to conventional DOA estimators in terms of resolution capability, estimation accuracy, and robustness against array model errors. 相似文献
17.
18.
Direction-of-arrival (DOA) estimation using an array of sensors relies on an accurate characterization of the array manifold. In the absence of characterization errors, established techniques like MUSIC can be shown to perform well both theoretically and in simulation. However, in the presence of unknown sensor and/or source characteristics, the performance of most methods degrades significantly. We consider the problem of estimating gain and phase errors of an array of sensors whose physical positions are known. Our algorithm assumes that the gain and phase characteristics of the sensors are independent of DOA and employs multiple calibration sources with known DOA's. It differs from other algorithms in that the signal wavelengths are unknown. A least-squares formulation of the problem is then shown to be NP-complete, implying that an efficient solution is unlikely to exist. An implicit, enumerative technique is used to obtain the exact solution. For the special case of collinear sensors, we further show that an inherent ambiguity in the model prevents exact phase characterization unless the wavelength of one calibration source is assumed known. A theorem is presented relating the error in DOA to the difference between the assumed and true wavelengths of this calibration source. Simulation results are presented for both noncollinear and collinear arrays 相似文献
19.
针对蜂窝移动通信局域散射电波传播的空间分布源模型,研究了应用菲涅尔区相位修正平面聚焦结构和馈源阵列的组合形成的一种新型多波束自适应天线.基于广义MUSIC算法及极大似然估计算法.分别实现相干及非相干的空间分布式源信号来波方向及其角度扩展参数的鲁棒性估计问题.数值仿真计算结果表明.在这一无线传播环境中,基于菲涅尔区相位修正平面聚焦结构在减小相关参数估计的RMS误差等方面,其性能优于传统的均匀直线阵列模型.因此基于该新型自适应天线.可以实现来波方向的鲁棒性估计。 相似文献