共查询到19条相似文献,搜索用时 125 毫秒
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为抑制高频雷达中的射频干扰,本文提出了一种自适应滤波器设计方法。首先,基于海杂波和射频干扰的多普勒特性,设计了海杂波区域自适应检测算法,以有效地估计射频干扰特性。然后,对海杂波、噪声和射频干扰的功率谱进行分析,并采用连续均值剔除算法,以检测射频干扰是否存在及其频率范围。最后,引入基于相似度约束的接收滤波器算法,根据射频干扰频带自动计算约束参数,从而实现了接收滤波器的自适应设计,以稳健地抑制射频干扰。仿真结果表明,相比传统白化滤波器,本文所设计滤波器可以有效地抑制宽带和窄带射频干扰,提高雷达抗干扰能力。 相似文献
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提出了直扩通信中一种改进的基于ATF(自适应时频)算法的干扰抑制方法。对原有算法进行了优化并给出了相应的自适应去干扰算法。采用自适应滤波技术取代子带剔除法,自适应地跟踪窄带干扰,改善了有用信号的丢弃情况,有效地抑制了窄带干扰。分析和仿真结果表明,基于ATF算法的自适应小波包时频干扰抑制方法比传统的子带剔除法在性能上更为优越,干扰定位速度也较快,干扰抑制能力强。 相似文献
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根据直接序列扩频信号和背景噪声与窄带干扰在频域上体现的不同特性,结合聚类算法,提出了一种基于频域的窄带干扰识别算法,并进行了仿真。仿真表明,该算法能够有效地识别出直接序列扩频系统中的窄带干扰。 相似文献
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《电子技术与软件工程》2017,(15)
本文分析了强干扰对连续波雷达的影响,提出了强干扰剔除的算法,从而消除了强干扰对连续波雷达目标检测的影响,改善了雷达的检测性能。并通过仿真验证了强干扰剔除算法的性能,在FPGA中实现了该算法。 相似文献
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针对基于颜色概率分布的连续自适应均值漂移算法(Camshift)跟踪算法在背景中出现相同颜色干扰时容易致使跟踪目标失败的问题,提出了一种改进的Camshift跟踪算法。首先对Camshift跟踪目标前进行目标检测,通过帧差法、光流法、背景差分法三种检测算法对比,采用背景差分法得到的运动目标区域矩形特征参数作为Camshift的初始化参数,取代一般Camshift算法利用颜色特征的跟踪。最后对改进的算法和一般Camshift进行仿真对比实验。实验结果表明,结合背景差分法和连续Camshift算法的运动目标跟踪在一定程度上满足了实时性与稳定性的要求。 相似文献
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《Communications, IEEE Transactions on》2005,53(8):1278-1282
Impulse radio (IR) systems have drawn attention during the last few years. These systems are planned to coexist with narrowband systems without interfering them. Nevertheless, the narrowband systems can cause interference which may jam the IR receiver. This letter analyzes a low-complexity narrowband interference (NBI)-mitigation algorithm for IR systems, based on minimal mean-square error combining. Theoretical analysis reveals that these algorithms nearly eliminate the NBI. The concept is also extended to the case where the receiver has more correlators than channel taps. 相似文献
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基于FFT的频域窄带干扰抑制算法是当前扩频通信中应用较为广泛的抗干扰技术之一,其特点是算法复杂度低,可以通过快速算法实现,很便于工程实现。考虑到对于算法的整体流程及性能已有不少现成的研究和结论,本文重点研究了干扰抑制滤波器设计中的陷波算法。总结了各种不同的陷波算法,利用Matlab软件对其中3种常用陷波算法进行了仿真分析,并以误码率为评价指标,比较了不同算法的性能。 相似文献
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This paper develops adaptive step-size blind LMS algorithms and adaptive forgetting factor blind RLS algorithms for code-aided suppression of multiple access interference (MAI) and narrowband interference (NBI) in DS/CDMA systems. These algorithms optimally adapt both the step size (forgetting factor) and the weight vector of the blind linear multiuser detector using the received measurements. Simulations are provided to compare the proposed algorithms with previously studied blind RLS and blind LMS algorithms. They show that the adaptive step-size blind LMS algorithm and adaptive forgetting factor blind RLS algorithm field significant improvements over the standard blind LMS algorithm and blind RLS algorithm in dynamic environments where the number of interferers are time-varying 相似文献
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An intercept receiver which uses a transform-domain-processing filter is described. This receiver detects direct-sequence binary-phase-shift-keyed (DS-BPSK) spread-spectrum signals in the presence of narrowband interference by employing adaptive narrowband interference rejection techniques. The improvement in the system performance over that of conventional detection techniques is shown by presenting the results of experimental measurements of probability of detection versus false alarm for an enhanced total power detector. Also presented are certain results corresponding to detection of the spectral lines generated at twice the carrier frequency, wherein the goal is often not just signal detection, but also carrier frequency estimation. The receiver uses one of two transform-domain-processing techniques for adaptive narrowband interference rejection. In the first technique, the narrowband interference is detected and excised in the transform domain by using an adaptive notch filter. In the second technique, the interference is suppressed using soft-limiting in the transform domain 相似文献