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兵工学报 ›› 2015, Vol. 36 ›› Issue (4): 696-702.doi: 10.3969/j.issn.1000-1093.2015.04.018

• 论文 • 上一篇    下一篇

基于上采样和高阶Hermite插值滤波器组的超宽带数字波束形成技术研究

杜强, 宋耀良, 季晨荷, 曹东   

  1. (南京理工大学 电子工程与光电技术学院, 江苏 南京 210094)
  • 收稿日期:2014-03-06 修回日期:2014-03-06 上线日期:2015-06-02
  • 作者简介:杜强(1985—),男,博士研究生
  • 基金资助:
    国家自然科学基金项目(61071145、61271331)

Research on UWBDBF Using Direct Time Delay Compensation Based on Up-sampling Technology and High-order HermiteInterpolation Filter Sets

DU Qiang, SONG Yao-liang, JI Chen-he, CAO Dong   

  1. (School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)
  • Received:2014-03-06 Revised:2014-03-06 Online:2015-06-02

摘要: 直接延时(DTD)补偿是超宽带(UWB)信号波束形成的有效方法,其数字波束形成(DBF)的效果与DTD滤波器的频率特性有直接的关系。在分析现有Lagrange插值滤波器存在问题的基础上,研究了利用多路上采样和高阶Hermite插值滤波器结合实现 UWB信号DTD的方法,以及通过多路延时补偿实现UWB信号DBF的技术。提出了一种结构简单的固定系数插值DTD补偿滤波器组的DBF实现方法。理论分析与仿真结果表明,与Lagrange插值法相比,该方法不仅实时性更好,而且在采样率低于Nyquist率时能更好地恢复原始UWB信号,其UWB信号DBF性能明显优于传统方法。

关键词: 雷达工程, 超宽带雷达, 波束形成, 高阶Hermite插值, 上采样

Abstract: Direct time delay (DTD) compensation is an effective method for beamforming of ultra-wideband (UWB) signal. The digital beam-forming (DBF) performance is directly related to the frequency response of the DTD filter. Based on the analysis of problems existing in Lagrange interpolation filter, a novel method utilizing interpolation filter sets with fixed coefficients is presented to implement DBF. High-order Hermite interpolation filter sets with simple structure combing multi-channel up-sampling technology are applied to DTD and the DBF of UWB signals is achieved by multi-channel delay compensation. Theoretical analysis and simulation results show that the proposed method is featured by a more accurate recovery of UWB signals when sampling rate is less than the Nyquist rate. It has a better real-time and an obviously superior DBF performance compared to the traditional methods such as Lagrange.

Key words: radar engineering, UWB radar, beamforming, high-order Hermite interpolation, up-sampling

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