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

作　　者：刘晗 陈靖峰[1] 杨柳 倪刚 贺冲[1] 金荣洪[1] LIU Han;CHEN Jingfeng;YANG Liu;NI Gang;HE Chong;JIN Ronghong(Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《电波科学学报》2023年第1期123-129,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(62001291,61901263);中国博士后科学基金(2020M671123)。

摘　　要：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.

关 键 词：测向 最优线性无偏估计(BLUE) 时间调制阵列(TMA) 谐波 测向精度 

分 类 号：TN821.1[电子电信—信息与通信工程]