基于GPS循环平稳特性的盲波束形成算法改进

在卫星导航自适应阵列抗干扰中,为避免先验信息误差和阵列误差对自适应波束形成性能的影响,可采用基于正交投影和导航信号循环平稳特性的盲波束形成算法(OCAB)。针对GPS信号,采用周期延迟信号处理的OCAB算法(CDOCAB)时,由于数据长度有限,噪声循环自相关函数估计量不为零,因此将影响循环平稳方法的性能,而采用解重扩数据辅助的OCAB算法(DS-OCAB)可以避免噪声估计误差的影响。将两种算法进行仿真比较,仿真结果表明,DS-OCAB算法可在少数据量的情况下保证算法性能不下降,提高算法的稳健性。

Blind beamforming algorithm improvement based on GPS cyclostationarity

In the field of adaptive array anti-jamming of satellite navigation,a blind adaptive beamforming algorithm based on orthogonal projection and cyclostationary can be used to avoid the error caused by prior information and antenna array. In this paper,CD-OCAB and DS-OCAB algorithms are analyzed for GPS signal. The estimation of the cyclic auto- correlation function of white noise is not zero due to the limited data length in CD-OCAB. Accordingly,the performance of cyclostationary method may be negatively affected. Fortunately,DS-OCAB can avoid it. Taking into account the complexity of the project,the receiving data is reduced. Simulation results demonstrate that the DS-OCAB algorithm can keep its performance and improve its robustness.