机载阵列雷达杂波抑制方法研究

发布时间：2019-02-12 21:24

【摘要】：空时自适应处理(STAP)技术能够显著提高机载阵列雷达动目标检测性能,但全维STAP因运算复杂度高导致其实时处理困难,因此能够实现准最优处理的降维STAP算法是工程应用的关键。此外,机载阵列雷达面临的杂波环境往往具有非均匀性,使得独立同分布训练样本不足,最终导致传统STAP算法性能下降,因此研究适用于非均匀环境的STAP算法具有重要意义。本文在建立空时二维信号模型的基础上,分析了机载阵列雷达杂波的时空耦合特性及非均匀特性,介绍了最优空时处理基本原理及典型降维STAP方法,并给出了功率非均匀杂波及距离依赖性杂波的典型解决方法。本文在时域滑窗处理基础上,通过对通道相关性的分析,结合辅助通道选取基本原理,提出了最小冗余的扩展F$A杂波抑制方法,该方法通过增加较少的辅助多普勒通道,使得杂波抑制性能得到较大程度的提升。
[Abstract]:Space-time adaptive processing (STAP) technology can significantly improve the performance of moving target detection in airborne array radar. However, due to the high computational complexity of full-dimension STAP, real-time processing is difficult. So the dimensionality reduction STAP algorithm which can realize the quasi-optimal processing is the key of engineering application. In addition, the clutter environment of airborne array radar is often non-uniform, which leads to the shortage of independent and co-distributed training samples, which leads to the deterioration of the performance of the traditional STAP algorithm. Therefore, it is of great significance to study the STAP algorithm suitable for the non-uniform environment. Based on the establishment of space-time two-dimensional signal model, the space-time coupling characteristics and non-uniform characteristics of airborne array radar clutter are analyzed. The basic principle of optimal space-time processing and the typical dimensionality reduction STAP method are introduced. The typical solutions of power inhomogeneous clutter and distance dependent clutter are given. On the basis of time domain sliding window processing, by analyzing the correlation of channels and combining with the basic principle of auxiliary channel selection, this paper proposes a minimum redundant extended FKA clutter suppression method, which adds less auxiliary Doppler channels. The performance of clutter suppression is greatly improved.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.51

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