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A Novel Two-Level Nested STAP Strategy for Clutter Suppression in Airborne Radar

机译：空气雷达杂波抑制的一种新型两级嵌套策略

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摘要

Nested arrays have been studied recently in array signal processing field because of their closed-form expressions for the sensor locations and achievable degrees of freedom (DOFs). In this paper, the concept of nesting is further extended to space-time adaptive processing (STAP). Different from the traditional uniform-STAP method that calculates the clutter plus noise covariance matrix (CNCM) and performs the STAP filter direct using the data snapshots collected from the uniform linear array (ULA) and the transmitting pulses with uniform pulse repetition interval (PRI), we present a new optimum two-level nested STAP (O2LN-STAP) strategy which employs an optimum two-level nested array (O2LNA) and an optimum two-level nested PRI (O2LN-PRI) to exploit the enhanced DOFs embedded in the space-time O2LN structure. Similar to the difference coarray perspective, we first construct a virtual space-time snapshot from the direct covariance matrix of the received signals. Then, a new CNCM estimation corresponding to the virtual space-time snapshot can be computed by the spatial-temporal smoothing technique for STAP filter. Furthermore, the comparative simulations and analyses with the traditional uniform-STAP and the recently reported coprime-STAP are carried out to verify the effectiveness of the O2LN-STAP approach.
机译：最近在阵列信号处理领域研究了嵌套阵列，因为它们的传感器位置的闭合表达和可实现的自由度（DOF）。在本文中，嵌套概念进一步扩展到时空自适应处理（STAP）。不同于传统的统一 - STAP方法，用于计算Clutter Plus噪声协方差矩阵（CNCM），并使用从均匀线性阵列（ULA）中收集的数据快照和具有均匀脉冲重复间隔（PRI）的传输脉冲进行数据快照执行STAP过滤器，我们提出了一种新的最佳两级嵌套STAP（O2LN-STAP）策略，采用了最佳的两级嵌套阵列（O2LNA）和最佳的两级嵌套PRI（O2LN-PRI），以利用嵌入的增强型DOF时空O2LN结构。类似于差异CoArray视角，我们首先从接收信号的直接协方差矩阵构造虚拟空间快照。然后，可以通过用于STAP滤波器的空间平滑技术来计算与虚拟空间快照对应的新CNCM估计。此外，对传统的统一液体和最近报道的Coprime-STAP进行了比较模拟和分析，以验证O2LN-STAP方法的有效性。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第13期|2540858.1-2540858.16|共16页
  • 作者

    Wang Wei; Zou Lin; Wang Xuegang;

  • 作者单位

    Univ Elect Sci & Technol China Sch Informat & Commun Engn Chengdu 611731 Sichuan Peoples R China|China Aerodynam Res & Dev Ctr Mianyang 621000 Sichuan Peoples R China;

    Univ Elect Sci & Technol China Sch Informat & Commun Engn Chengdu 611731 Sichuan Peoples R China;

    Univ Elect Sci & Technol China Sch Informat & Commun Engn Chengdu 611731 Sichuan Peoples R China;

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