摘要
在使用阵列天线接收卫星导航信号时,波束形成是影响抗干扰接收的关键因素,传统方法利用接收信号进行短时间的训练或者采用随机产生的序列作为波束形成的参考,这造成参考信号训练计算量大,或参考信号粗糙导致波束形成不准确。提出一种基于矢量跟踪环路的阵列天线盲波束形成方法,将矢量跟踪环路预测的本地码作为参考信号,利用北斗卫星信号的循环平稳性,通过计算阵列天线加权后的输出信号与本地参考信号的相关性构造代价函数,实现对干扰信号的抑制和兴趣信号的增强,并结合北斗卫星信号在空间上的稀疏特性给出约束条件,在确保波束收敛的同时提高矢量跟踪的鲁棒性。与传统谱自相关方法利用接收信号自相关性构造代价函数相比,优化算法干扰信号方向零陷更深,改善输出信号的信干噪比1dB。
The paper proposed a blind array antenna beam forming method based on vector tracking loop. The lo- cal code predicted by vector tracking loop was used as a reference signal creatively. With the cyclostationarity of Beid- ou satellite signals, the cost function was constructed by calculating the correlation between output of weighted axTay antenna signal and the local reference signal, to achieve the suppression of interference signal and enhancement of interest signal. Combined with the sparsity of Beidou satellite signals in feature space, the constraints were given, which ensures the beam converges and improve the robustness of vector tracking at the same time. Compared with tra- ditional spectral autocorrelation method, the proposed algorithm is of higher accuracy and faster convergence, and im- proves the output signal SINR by 1 dB.
出处
《计算机仿真》
CSCD
北大核心
2016年第3期52-55,共4页
Computer Simulation
关键词
阵列天线
矢量跟踪
循环平稳
稀疏
波束形成
Array antenna
Vector tracing
Cyclostationarity
Sparsity
Beamforming
