摘要
提出一种简易有效且便于实际系统应用的圆阵幅相误差校正方法.在圆阵中心放置一发射校准信号辅助天线,通过计算比较各阵元接收信号与基准阵元通道接收信号的互相关系数即可得到各阵元通道的相对幅相误差闭式解,计算量较小,估计精度高.1×104次统计独立仿真分析了该方法在不同信噪比和不同快拍数情况下的性能,在校准信号信噪比25dB,采样数400的情况下,幅度估计误差为0.03,相位估计误差为0.5°.对有幅相误差的8元圆阵进行了二维测向实验,经所提方法校正后的阵列测向方位角误差为0.3°、俯仰角误差为1.6°,仿真及实验结果验证了该校准方法的有效性.
An effective and practical method to calibrate gain and phase errors of a circular array （CA） was proposed. By putting an assistant sensor on the center of CA, the method can obtain the relative- ly gain and phase errors of each sensor with low computational burden and high estimation precision. The performance of the method was analyzed through the computer simulation by 1 × 104 times in the different signal-to-noise ratio （SNR） and different snapshots, respectively. The estimated errors of gain and phase were 0.03 and 0. 5° by the proposed method when SNR was 25 dB and snaps was 400. The method was also used to calibrate the gain and phase errors of 8-element uniform circular array （UCA） and performed to be effective by 2-dimension directions finding experimental study with the estimation errors of azimuth and elevation being 0.3° and 1.6°.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第9期1-5,10,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家科技支撑计划资助项目(2008BAC36B02)
关键词
波达方向
校正
幅相误差
圆阵
测向实验研究
低复杂度
direction of arrival~ calibration
gain and phase errors~ circular array~ direction findingexperiments~ low complexity
