共查询到18条相似文献,搜索用时 93 毫秒
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针对某型引进全高度雷达波导移相器的故障情况,分析移相器内部器件损坏失效原因,研究移相器设计和制造工艺缺陷,探讨解决问题的具体办法和防范措施,提高装备保障能力。 相似文献
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针对矢量调制移相器存在的移相误差和增益波动问题,提出一种矢量调制移相器的反馈补偿设计方法.在分析了矢量调制的移相原理及影响移相精度和增益稳定性的误差因素的基础上,根据反馈补偿原理对误差因素进行补偿校正.首先通过自动化的测试和处理流程,得到移相器的相位和增益误差特性表,然后将该误差特性表反馈至移相器监控单元,最后监控单元利用插值算法和归一化原理实现对误差量的补偿校正.对采用该方法设计的移相器进行实际测试,结果表明:其移相精度小于1°,增益随相位变化波动小于0.4 dB,对比补偿校正之前,移相精度和增益稳定性得到了大幅提高和改善,从而验证了该方法的有效性. 相似文献
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描述了用于雷达的X波段GaAsHMIC(混合微波集成电路)五位数字式移相器的设计过程。该设计采用了一种新型的电路结构,取得了较好的微波特性,同时大大减小了其尺寸。 相似文献
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Greenbaum M. Kaufman A. Wallen A. 《IEEE transactions on aerospace and electronic systems》1974,(4):537-538
This correspondence considers the use of a stepped phase shifter as an approximation to continuous phase shifting for serrodyne frequency translation. Variations in translation loss and suppression of undesirable components as a function of the number of steps used is presented. 相似文献
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Analysis of Surface Micro Machined RF MEMS Phase Shifters 总被引:1,自引:0,他引:1
Janardhana V. Roy J.S. Kulkarni R.G. 《Aerospace and Electronic Systems Magazine, IEEE》2008,23(5):32-35
Development of low loss radio frequency micro-electro-mechanical (MEMS) phase shifters for radar and telecommunication applications is presented. Numerical simulation results using electromagnetic simulator tools (CST - Germany) along with fabricated wafer level measurement results of two distributed MEMS phase shifters are presented herein for upstate capacitive bridge position. The distributed MEMS phase shifter consists of coplanar waveguide (CPW) transmission line and several MEMS bridges loading capacitively on transmission lines to create a slow wave structure. Two configurations of phase shifters are presented. 1) Conventional distributed MEMS transmission line (DMTL) 2) coplanar waveguide - microstrip - coplanar waveguide (CPW-MS-CPW), with microstrip as the transmission line and CPW as input and output line. The electromagnetic simulation results of gap height variation to change the phase velocity and, in turn, phase shift is presented. Work is underway to vary the gap height between transmission line and the bridge, applying the actuation voltage to bridge capacitors, which, in turn, will vary the bridge capacitance, changing the phase velocity on fabricated phase shifters. The match between simulated results and wafer level measurements are encouraging and will be presented in the full paper. Work is also underway to validate wafer level measurements along with numerical simulation using circuit models using circuit simulator. The custom model libraries for phase shifters are being developed. The results are encouraging. 相似文献
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方波幅度的测量不确定度 总被引:3,自引:1,他引:3
介绍了用众数法评价方波幅度时的不确定度分析和评价过程;讨论了主要的不确定度来源,包括众数判别区间的影响、波形测量系统幅度测量误差的影响等等;给出了减小不确定度的主要措施,并结合一个实例,给出了方波幅度的不确定度评价结果。 相似文献
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王郁 《西安航空技术高等专科学校学报》2013,(6):10-12,15
作为构建反腐倡廉体系的基础性工作之一,高校廉洁文化教育是从源头上防治腐败的根本之策,关系到整个社会廉洁文化的建设。从打造廉洁文化教育教师主体团队,发挥党团组织的战斗堡垒作用,弘扬廉洁校园文化节、占据网络文化教育阵地等方面,对高校廉洁文化教育载体进行研究,旨在为高校廉洁文化教育提供些许参考意见。 相似文献
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介绍了用标准时间间隔发生器检定秒表时,测量结果不确定度分析和评定过程;讨论了测量不确定度的几个主要来源;通过一组实例,给出了秒表检定不确定度的分析和评定结果,该过程和结论可应用在对于计量标准进行相应指标的不确定度分析上,也可用于估计秒表检定本身的不确定度。 相似文献