基于频谱特征分析的多谐波时间调制阵列测向方法

Multi-harmonic direction-finding method in time-modulated array based on frequency spectrum property analysis

针对基于谐波特征分析的时间调制阵列(time-modulated array,TMA)测向技术中信息利用率低的问题,提出了一种基于信号频谱特征分析的多谐波TMA测向方法.通过分析接收信号的频谱特征,构建了基于信号频谱特征多谐波测向模型,推导了基于频谱特征的来波方向最优线性无偏估计(best linear unbiased estimation,BLUE)表达式,从而提高了测向精度及稳定性.以BPSK信号为例,通过仿真实验验证了所提算法的有效性,同时搭建了工作于S频段的二单元TMA测向系统证实了所提方法的可行性.

Aiming to improve the low information utilization of direction-finding methods with the harmonic property analysis under time-modulated array(TMA),a multi-harmonic direction-finding method of TMA based on signal spectrum characteristic is proposed.By analyzing the signal frequency spectrum,the multi-harmonic directionfinding model is established and the best linear unbiased estimated formulation is derived,which can effectively improve the direction-finding accuracy and stability of TMA in the noise environment.The binary phase shift keying(BPSK)signal is provided as a typical communication signal to examine the effectiveness of the proposed method.Meanwhile,an S-band two element TMA is also constructed to verify its feasibility in the experiment.