均匀圆阵下微波光子鉴相相关干涉仪测向算法  

Correlative Interferometer‑Based Direction Finding Technology with Uniform Circular Array and Microwave Photonic Phase Detector

作　　者：张先玉 梁涛 安康 赵修星 ZHANG Xianyu;LIANG Tao;AN Kang;ZHAO Xiuxing(The 63rd Research Institute,National University of Defense Technology,Nanjing 210007,China;Unit 75841 of PLA,Changsha 410000,China)

机构地区：[1]国防科技大学第63研究所,南京210007 [2]解放军75841部队,长沙410000

出　　处：《数据采集与处理》2023年第2期468-478,共11页Journal of Data Acquisition and Processing

基　　金：中国博士后科学基金(2021MD703980);国家自然科学基金(61901502)。

摘　　要：为实现高频段微波信号的精确测向,提出了一种基于微波光子鉴相器的均匀圆阵相关干涉仪测向算法。为克服传统的电域鉴相器工作频段低、带宽窄的缺点,利用微波光子技术高频段、大带宽、低损耗和抗电磁干扰的优点,基于双偏振调制器设计一种微波光子鉴相器,利用光干涉将相位差信息映射为光信号功率,通过测量功率计算出相位差。该微波光子鉴相器精度高,能实现±180°的相位差测定,鉴相精度为±2°。利用余弦函数克服了传统相关干涉仪存在的相位模糊问题。同时,为确保算法的实时性,测向算法需选取适当的步进角度。为克服步进角度引入的测向误差,利用二维抛物面进行拟合插值运算,从而提高算法的精确度。最后,通过仿真验证了微波光子鉴相器和相关干涉仪测向算法的有效性。In order to realize precise location for microwave wideband signals with high accuracy,this paper investigates the correlative interferometer‑based direction finding algorithm with uniform circular array and microwave photonic phase detector.Compared with the low operating frequency and narrow bandwidth of the electronic microwave phase measurement,a photonic microwave phase measurement using dual polarization Mach‑Zehnder modulator(DPol-MZM)is presented with the benefits of high frequency band,wide bandwidth,ultralow loss and immunity to electromagnetic interferences.The output optical power is related to the phase shift which can be employed for the phase shift measurement.Owing to the accuracy monitoring,the proposed phase detector can measure the phase shift from-180°to 180°with±2°measurement error.In addition,the cosine function has been chosen to replace the conventional correlation function to solve the phase ambiguity.Meanwhile,an appropriate search algorithm with large angle step should be selected to ensure that the direction finding algorithm can be operated in real time.Besides,the conicoid interpolation fitting has been exploited for compensation the measurement error caused by the large search step.Finally,representative simulations have been presented to demonstrate the validity of the microwave photonic phase measurement and the direction finding algorithm.

关 键 词：微波光子学 相关干涉仪 鉴相器 均匀圆阵 测向 

分 类 号：TN98[电子电信—信息与通信工程]