摘要
针对通道幅相误差条件下的相干信源波达方向(direction of arrival,DOA)估计问题,提出一种基于互相关矢量的误差校正和解相干算法。首先对阵列的状态转换进行时延控制,使两个子阵的接收数据保持旋转不变特性。再利用阵列互相关矢量元素的错位比值实现了误差系数估计,将误差校正后的互相关矢量重构为一个等效协方差矩阵即可实现解相干。进一步对不同时延可能导致的角度偏移进行了分析。仿真结果表明,该算法能够实现通道幅相误差的精确校正及解相干,且DOA估计性能接近于无幅相误差条件下的空间平滑类算法。
To solve the problem of direction of arrival （DOA）estimation of coherent signals in the presence of channel amplitude-phase errors,a method based on cross-correlation vectors is proposed.Firstly,the time delay of array state transition is controlled to ensure that the observed data of each subarray have a property of rotational invariance.Then,error coefficients can be estimated with the ratio of different elements from cross-correlation vectors.Meanwhile,the decorrelation of coherent signals can be accomplished by reconstructing an equivalent covariance matrix,which is made of cross-correlation vectors without error coefficients.Moreover, angle offset caused by different time delays is analyzed.Simulation confirms that the proposed algorithm is ef-fective in channel amplitude-phase errors calibration and decorrelation,which has high resolution characteristics similar to the spatial smoothing algorithm without amplitude-phase errors.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2015年第10期2222-2227,共6页
Systems Engineering and Electronics
基金
国家自然科学基金(60902054)资助课题
