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雷电干扰的形成与防护 总被引:1,自引:0,他引:1
本文简单介绍了雷电的形成及其基本特性,阐述了雷电通过各种途径形成干扰的机理和防护措施,以及在保护,控制线路中雷电干扰的估计,给出了高压变电站因雷电在二次电缆中产生的干扰电压计算示例,最后还就浪涌抗扰度试验中试验水平进行讨论。 相似文献
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某电子系统的ESD抗扰度性能研究 总被引:1,自引:0,他引:1
对某军用电子系统(简称被试系统)进行了静电放电(ESD)抗扰度试验,研究了不同放电模式下系统受ESD干扰情况。当放电电压低于2kV时,ESD对于被试系统基本不造成干扰;当放电电压超过2kV后,被测系统信号出现了过零点不正常、不翻转和死机三种现象。分析认为被试系统中检测仪在电磁兼容性(EMC)方面存在的问题,是影响整个被试系统抗扰度的主要原因。采取电磁防护加固措施能提高系统的ESD抗扰度性能。 相似文献
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通过分析骚扰信号在广播电视接收机中产生干扰的原理,并以此为依据提出相关的电路改进的原理与具体措施,使广播电视接收机输入抗扰度性能符合GB/T9383-1999的要求。 相似文献
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图象质量的主观评价按评价方法的单项要素有;色纯,会聚,高度和色度分量间的重合,灰度绝调,几何失真和图象重显度,灰度重现,彩色满意度,图象干扰等,此外还有“清晰度”和总的图象质量”,在其它要素较好的情况下,这两个要素决定了彩电的技术水平,为提高图象质量采用了各种动态调整技术。 相似文献
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In spite of spectrum sensing, aggregate interference from cognitive radios (CRs) remains as a deterring factor to the realization of spectrum sharing. We provide a systematic approach of evaluating the aggregate interference (I aggr) experienced at a victim primary receiver. In our approach, we model the received power versus propagation distance relations between a primary transmitter, primary receiver, and CRs. Our analytical framework differs from the previous works in that we have formulated the relationship between I aggr and the sensing inaccuracy of CRs. Energy detector is assumed for the purpose of spectrum sensing. I aggr is expressed explicitly as a function of the number of energy samples collected (N ) and the threshold signal‐to‐noise ratio level used for comparison (SNRε ). The theoretical analysis is then applied to a practical scenario of spectrum sharing between digital TV broadcast and the IEEE 802.22 wireless regional area network systems. The impact on digital TV reception is evaluated in terms of signal‐to‐interference ratio. The proposed method allows us to determine the appropriate wireless regional area network operating conditions that fulfill the signal‐to‐interference ratio requirement imposed by regulator. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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The coarse acquisition performance of a direct sequence spread-spectrum receiver is analyzed when a linear prediction filter is used for narrowband interference suppression. We show that once an appropriate matching strategy is identified, the linear prediction filter can provide favorable performance when narrowband interference is present over a considerable range of both interference power and bandwidth. In addition, the presence of the filter dramatically improves the performance over the case where there is no filter, except when the interference bandwidth and the power are both small (i.e., when the processing gain provides sufficient interference immunity without the filter). If long spreading sequences are used with moderately sized observation windows, the acquisition performance can be severely degraded when a parallel acquisition scheme is used due to the linear predication filter. We show, however, that a slower serial receiver will provide reliable performance.This work was supported in part by the Office of Naval Research under contract ONR N00014-91-J-1234, the Army Research Office under contract ARO DAAL03-91-0071, and the NSF Center for Ultra-High Speed Circuits and Systems (ICAS). 相似文献
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介绍某雷达接收系统中一种干扰检测设计方案。对此方案的特点及运用范围均进行明确阐述,对接收系统中干扰检测信息进行分类,并介绍不同处理方法,具有较强实用性。 相似文献