摘要
研究了极化域-空域联合谱估计的精度问题。用克拉美-劳限(CRB)来衡量信号到达角和极化角的估计精度;利用Fisher信息矩阵求逆导出信号到达角和极化角CRB的解析表达式,得出采样点数和阵元数目对估计精度的影响; 通过单个信号源和两个信号源情形下的研究,得出估计精度与信号源位置、信噪比、信干比、信号特征参量之间的关系。
This paper investigates the estimation accuracy of joint spectrum in polarizational and spatial domains. The CramerRao Bound （CRB） is used to evaluate the accuracy of the estimated directions of arrival and polarization angles. The compact form formulas are presented for the CRB corresponding to the joint estimation of the DOAs and polarization angles thought inversing the Fisher Information Matrix. Numerical examples and special cases provide insights into the effects to accuracy of snapshots, number of elements, signal parameters, Signal to noise Ratio （ SNR）, Signal to Interferer Ratio （ SIR）, spatial separation and polarization difference between signal and interferer.
出处
《信号处理》
CSCD
北大核心
2006年第3期317-320,共4页
Journal of Signal Processing
基金
全国优秀博士论文专项资金(08100101)湖南省自然科学基金(02JJY2100)国防科技大学优秀博士生创新资助
关键词
极化域
空域
联合谱
估计精度
克拉美——劳限
Polarizational Domain
Spatial Domain
Joint Spectrum
Estimation Accuracy
CRB
