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In recent years,considerable attention has been paid to adaptive clutter suppressionfor airborne early warning(AEW)radars.A necessary condition for efficient clutter suppressionis that the number of adaptive degrees of freedom(DOF)is no less than that of clutter DOF.This paper analyzes the DOF of clutter for phased array AEW radars.The new results obtainedhere are helpful to design an adaptive system for clutter suppression. 相似文献
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抑制杂波一直为机载预警(AEW)雷达信号处理的关键技术。本文根据机载相控阵雷达侧面阵的杂波谱特点,提出了一种用时空二维配对滤波处理来抑制AEW雷达杂波的准最优方法,该方法的特点是运算量小,能实现实时处理,且对低速目标的检测性能较常规的空时级联处理有较大程度的改善。另外,该方法还可以推广到其它非侧面阵的情形。 相似文献
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To suppress the ground clutter for airborne early warning (AEW) radars is the key technique in radar signal processing. In this paper, a spatial-temporal nonadaptive joint filter processing approach is proposed to suppress the clutter for AEW radars, which can significantly reduce the computation compared with other optimal or suboptimal methods. The performance of this approach is better than that of the conventional cascaded nonadaptive processing, especially. 相似文献
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阵元幅相误差对AEW雷达二维杂波谱的影响 总被引:2,自引:2,他引:0
本文研究了不可避免的阵元幅相误差对各列先微波合成为列子的矩形侧面相控机载预警(AEW)雷达二维杂波谱的影响,并分析了基于理想“脊背型”杂波谱的二维信号处理性能下降的原因,为深入研究时空二维处理提供了基础。 相似文献
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正侧视阵MIMO(Multiple-Input Multiple-Output)双基地雷达系统具有严重的距离依赖问题和杂波谱展宽现象,该文分析其杂波特性,提出了一种距离模糊杂波抑制方法。该方法在传统的MIMO双基雷达中引入距离相关的相位项,从而提供额外的自由度,通过该相位项的距离信息实现不同距离的杂波分离,并进一步对其进行有效抑制。从而解决了双基地预警雷达大场景下地面杂波距离杂波模糊的问题,仿真结果显示该方法的正确性,并且和已有的DW(Doppler Warping)距离模糊杂波抑制方法进行比较,使用IF(Improve Factor)谱线对抑制结果进行对比,显示该方法有更优的性能。 相似文献
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双基地雷达中引入多输入多输出(MIMO)技术,可以从接收数据中获取双基地雷达发射角度信息。这一新增的角度信息用于空时自适应处理,获得发射空间-接收空间和多普勒3 维杂波谱。该文旨在对双基地MIMO 雷达空时自适应处理抑制杂波方法进行综述。首先介绍了双基地MIMO 雷达信号模型,然后介绍了几种正侧视双基地MIMO 雷达空时3 维自适应处理方法(3D-STAP),包括3 维线性最小方差(3D-LCMV)方法、3 维辅助通道方法、3维局域化联合处理以及3 维投影的空时3 维降维杂波抑制方法,仿真分析表明这些降维方法能够有效提高小样本条件下的双基地MIMO 雷达距离依赖杂波抑制性能。最后,对双基地MIMO 雷达空时自适应处理研究做了总结和展望。 相似文献
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When the Airborne Early Warning (AEW) radar transmits medial or high Pulse Repetitive Frequency (PRF) signal, the range ambiguity occurs. The clutter of short-range clutter has serious range dependence problem for non-Side Looking Airborne Radar (non-SLAR). As a result, the clutter plus noise covariance matrix can not be estimated correctly, and the performance of clutter suppression obtained by Space-Time Adaptive Processing (STAP) degrades greatly. The uniform linear array has not elevation degrees; therefore, the short-range clutter can not be suppressed directly. A short-range clutter suppression method is proposed. The method first estimate the elevation angles of the am-biguous short-range gate, then eliminates short-range clutter by space time interpolation and adds moving target protection in the procedure. This method can suppress the short-range clutter well. Simulation results show the validity of the method. 相似文献
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近些年来,世界各国越来越重视风力发电的发展。风电场的存在可能对航管监视雷达性能产生负面影响,因此风电场杂波抑制技术的研究对于提升航管监视雷达工作性能、保障空中交通安全具有重大意义。形态成分分析(MCA)算法根据信号稀疏特征的不同应用于风电场杂波抑制时,计算量较低且性能较好。但是针对实际雷达参数中相参处理间隔(CPI)较短造成的谱分辨率降低及信号特征不明显时,MCA算法的杂波抑制性能受到影响,因此选择将稀疏重构算法与MCA算法结合用于短CPI情况下的风电场杂波抑制。该文认为短CPI接收回波数据为较长CPI雷达回波数据基础上发生尾部数据缺省,继而利用稀疏重构算法对缺省数据进行恢复,再利用MCA算法抑制风电场杂波。实验结果验证了该方法的有效性。 相似文献
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Gabel R.A. Kogon S.M. Rabideau D.J. 《Electronics & Communication Engineering Journal》1999,11(1):49-56
This paper summarises a study of terrain-scattered interference (TSI) mitigation techniques, focusing on joint TSI mitigation and monostatic clutter nulling for airborne radars. It begins with an overview of TSI phenomenology and two-dimensional space-time adaptive processing (STAP) techniques for cancelling TSI. Two approaches for mitigating combined TSI and clutter are then examined. In the first approach, a sequence of two-dimensional adaptive filters is used. The first of these filters cancels TSI, while the second filter cancels monostatic clutter. In the second approach, a single, three-dimensional pre-Doppler STAP algorithm is used to cancel clutter and TSI simultaneously. Performance results for a representative system are shown to illustrate the trade-offs inherent in designing a mitigation approach 相似文献