关键词: DOA 估计, 分数低阶统计量, 四元数, 海杂波, 电磁矢量传感器

Abstract:

The sea clutter is affected by many factors, and is more complicated. The sea clutter noise has great impact on the estimated performance of the target signal's DOA(Direction Of Arrival) of Radar system. A new quaternion model to estimate signal's DOA combining with existing fractional lower order statistics algorithm
based on uniform electromagnetic vector sensor array is proposed. First, the electromagnetic vector array of quaternion was deduced, then the quaternion fractional low-order covariance was got by using fractional lower-order statistics. Finally, the quaternion field sparial spectrum was presented. The simulation results indicate that the method has a better performance than others in noise suppression and accuracy of the signal parameter estimation. Simulation results has demonstrated the effectiveness of the method.

Key words: direction of arrival(DOA) estimation, fractional lower order statistics, quaternion, sea clutter, electromagnetic vector sensor