GPS空时抗干扰子空间投影方法  

Interference suppression in GPS receiver using space-time subspace projection techniques

作　　者：郭艺[1] 张尔扬[1] 沈荣骏[2] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073 [2]解放军总装备部科学技术委员会,北京100080

出　　处：《通信学报》2007年第5期62-66,72,共6页Journal on Communications

摘　　要：根据GPS接收机接收信号、噪声和干扰的特点,将子空间投影方法与空时信号处理相结合,利用基于数据域相关相减结构多级维纳滤波器(CSA-MWF)的前向递推多级分解特性构造出空时二维干扰子空间,进一步求出空时抗干扰最佳权。与传统的特征值分解方法相比,该方法避免了估计接收数据协方差矩阵及其特征分解运算,计算量大幅下降,同时抗干扰性能不受影响,适合多变环境和小数据样本情况。该方法结构简单,具有较高的可行性和实用性。仿真结果验证了该方法对窄带和宽带干扰均有效。A new approach was proposed for interference suppression in GPS receiver. It combines subspace projection with space-time processing based on the characters of GPS signal, noise and jammers. Space-time interference subspace is constructed using the multistage decomposition structure of the MWF based on the correlation subtractive architecture. Then the optimal filter is educed. Comparing with conventional eigenvalue decomposition technique, the method proposed avoids the estimation of receive data covariance matrix and its eigenvalue decomposition, reduces the computation while the anti-jammer performance is not affected. The performance in numerical simulation demonstrates that it is effective and efficient to both narrowband and wideband interference.

关 键 词：GPS 空时处理 子空间投影 多级维纳滤波 

分 类 号：TN911.7[电子电信—通信与信息系统] TN957.52[电子电信—信息与通信工程]