基于频谱特征分析的多谐波时间调制阵列测向方法

刘晗; 陈靖峰; 杨柳; 倪刚; 贺冲; 金荣洪

doi:10.12265/j.cjors.2021275

基于频谱特征分析的多谐波时间调制阵列测向方法

doi: 10.12265/j.cjors.2021275

上海交通大学电子工程系, 上海 200240

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

详细信息

作者简介:
刘晗：(1997—)，女，河南人，硕士研究生，主要研究方向为时间调制阵列，无线信号测向

陈靖峰：(1986—)，男，江苏人，上海交通大学电子工程系博士后，工学博士，研究方向为阵列信号处理、无线电测向定位和电子对抗等

杨柳：(1999—)，女，女，重庆人，本科生，主要研究方向为时间调制阵列、信号处理

倪刚：(1996—)，男，安徽人，博士研究生，主要研究方向为阵列信号处理、无线通信

贺冲：(1985—)，男，湖北人，上海交通大学电子工程系助理教授，博士，研究方向为阵列信号处理、相控阵技术和无线电测向与定位等

金荣洪：(1963—)，男，江苏人，教授，博士生导师，IEEE Fellow，主要研究方向为现代天线技术、电磁计算方法，阵列信号处理、微波集成电路及相控阵天线等

通讯作者:
陈靖峰 E-mail: laowu3917@sjtu. edu. cn

中图分类号: TN821.1
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- 被引次数: 0
出版历程
- 收稿日期: 2021-10-13
- 录用日期: 2022-05-18
- 网络出版日期: 2022-05-18

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

Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

摘要

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，本文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. 本文以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.
- 测向 /
- 最优线性无偏估计(BLUE) /
- 时间调制阵列(TMA) /
- 谐波 /
- 测向精度
Abstract: 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 in this paper. By analyzing the signal frequency spectrum, the multi-harmonic direction-finding 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.
- direction finding /
- best linear unbiased estimator (BLUE) /
- time modulated array (TMA) /
- harmonic /
- direction-finding accuracy

HTML全文

图 1 TMA测向系统框图

Fig. 1 Block diagram of TMA direction-finding system

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图 2 RMSEs与对应频点数关系仿真结果

Fig. 2 RMSEs of joint BLUE method with different number of frequency points

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图 3 不同算法RMSEs随入射角度的变化

Fig. 3 The comparison of RMSEs with different DF methods

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图 4 不同加权方法RMSEs随入射角度的变化

Fig. 4 The comparison of RMSEs with different weighted methods

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图 5 实验测试环境和测向系统.

Fig. 5 The test environment and DF system.

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图 6 不同入射角度下调制信号的功率谱.

Fig. 6 Power spectrums of modulated signals with different incident angle.

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图 7 不同测向方法的测向标准差

Fig. 7 The standard deviations of different DF methods

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