摘要
针对均匀圆形阵列 ,在时空旋转因子的基础上 ,推导出四阶累积量矩阵 ,采用波达方向矩阵法 ,实现了信号的方位角、俯仰角和多普勒频率的同时估计。此估计算法利用所有阵元信息估计信号波达方向 ,提高了方向估计精度 ,解决了“频率兼并”问题 ,使有效应用范围扩大。利用了四阶累积量的盲高斯性 ,有效地抑制了高斯白或有色噪声的影响 。
For signals incident on a uniform circular array (UCA), a new blind estimation of azimuths, elevations and Doppler frequency are proposed. The mode excitation method is used to transform the manifold matrix of UCA into one with a form similar to that of ULA. By adopting the space time rotational techniques, a fourth order cumulant based DOA matrix is deduced. The new method can completely estimate the 2D angles of multiple signals even with the same Doppler frequency each other. The Gaussian white or colored noises within signal sources can efficiently suppressed. The estimate precision has been improved due to using the value of all sensors. Simulations are presented to show the validity of this method.
出处
《计量学报》
CSCD
北大核心
2003年第3期231-235,共5页
Acta Metrologica Sinica
基金
国家自然科学基金 ( 69872 0 12 )
关键词
计量学
信号处理
均匀圆阵
二维方向角和频率估计
四阶累积量
时空旋转
Metrology
Signal processing
Uniform circular array
Two dimensional parameter estimation
Fourth order cumulant
Space time rotation
