低信噪比下相关干涉仪测向处理方法  

Direction-finding Processing Method of Correlation Interferometer Under Low SNR

作　　者：张智锋[1] 乔强[1] 

机构地区：[1]中国电子科技集团公司第54研究所,石家庄050081

出　　处：《舰船电子对抗》2009年第6期103-106,共4页Shipboard Electronic Countermeasure

摘　　要：针对在低信噪比条件下相关干涉仪测向来波方位角估计误差较大甚至有时失效的问题,提出一种基于相位差矢量累积的相关干涉仪测向处理方法。与直接使用相位差的常规相关干涉仪测向不同,该方法首先利用多次测量的相位差和信号幅度构造复数矢量,然后对这些矢量进行累积运算,再与天线的阵列流形进行拟合。此方法通过提高相位差的测量精度和稳定度从而达到即使在低信噪比条件下也可以得到较高测向准确度,具有算法简单、性能稳健的特点。最后通过仿真分析,对文中提出的方法给予验证。Aiming at the problem that the estimation error of arrival wave azimuth is large even sometimes disabled by using the correlation interferometer direction finding（DF） under the low signal-to-noise ratio（SNR）,this paper presents a DF method of correlation interferometer based on the phase-difference（PD） vector accumulation.Unlike the conventional correlation interferometer DF that directly using phase difference,this method firstly uses the PD measured several times and the signal amplitudes to construct the complex number vectors, then performs the accumulative cal- culation to these vectors,then fits them and the array manifold of the antenna. The higher DF accu- racy can be fetched by this method even under low SNR through raising the measurement accuracy and the stability of the PD, the algorithm is simple and its performance is stable. Finally the method proposed in this paper is validated through simulation analysis.

关 键 词：相关干涉仪 测向 信噪比 

分 类 号：TN911.7[电子电信—通信与信息系统]