共查询到19条相似文献,搜索用时 99 毫秒
1.
相控阵天线装配好之后,由于各组成部件机械加工误差、装配误差、部件老化更换和环境温度改变等因素,各
单元通道的初始幅相产生差异,因此必须对天线的所有系统进行校准。本文针对小型化相控阵平台,通过硬连接将相控
阵天线的波控系统与测试设备相结合,提出一种简便的自动化近场逐点校准方法。同时,本文还提出一种简单的外监测
方法。当相控阵天线工作期间,可对阵面的幅相分布进行监测。可在相控阵天线工作期间,对近场幅相校准数据进行修
正,达到阵面自身校准的目的。经对一个16阵元的相控阵天线进行实验测量可知,该自动化校准与阵面自身校准方法可
以准确、快捷测试出天线阵面的幅相分布。非常适合一维、二维相控阵天线,尤其是小型化相控阵天线的幅相校准与监
测。 相似文献
2.
有源相控阵天线的近场校准 总被引:1,自引:0,他引:1
为实现对相控阵天线的校准,降低幅相误差和阵元失效对天线性能的影响,提出了一种考虑互耦效应的近场校准方法。在利用近场扫描法完成逐一通道校准的基础上,使用旋转矢量法进行二次校准。在应用旋转矢量法( REV)时,为使被测信号的变化明显,将大规模相控阵天线分为中间、边缘区域进行分区校准。通过二次校准可判定阵元是否失效,提高相控阵天线的幅相一致性;通过分区校准减小阵元间互耦的影响,缩短校准时间。仿真结果表明:此方法用于大型相控阵的校准具有较高的准确性,可改善校准结果。 相似文献
3.
基于耦合线的有源相控阵雷达幅相监测校准方法 总被引:1,自引:1,他引:0
介绍了采用校准耦合线对有源相控阵单元进行幅相校准的方法,并就监测支路自身的不一致性给于补偿.最后就发射阵的校准精度及校准时间进行了讨论. 相似文献
4.
中场测量相控阵扫描方向图的方法研究 总被引:2,自引:0,他引:2
有源相控阵天线的发射和接收天线的性能依赖于阵面口径的幅相分布,有源相控阵的幅相校准工作通常在出厂前通过暗室中的平面近场测量进行,但是某些大型的有源阵面根本无法进暗室进行校准,利用外场测量进行的校准往往无法验证其结果的好坏,该文介绍了一种中场测量相控阵天线扫描方向图的方法,使校准结果能够得到较为客观的评估。 相似文献
5.
提出了一种相控阵发射系统中闭环幅相校准开关阵的方案。从工程实现的角度介绍了校准开关阵的设备组成、特点和性能,论述了相控阵发射系统中幅相校准的原理、分类和实现方式,并详细推导单信道实现幅相检测的算法。该算法利用同一信道幅相误差稳定的特点,建立多组功率测量值的方程,并联立求解出各通道相对基准信道的幅度差和相位差。理论分析和工程实践均验证了该方案的有效性和实用性。 相似文献
6.
毫米波阵列天线由于其阵元间距小,装配和生产过程带来的误差对通道的初始幅相带来较大的影响,因此必须对其进行校准。介绍了一种基于Phase toggle算法的近场校准方法,该方法不仅能够提高相控阵天线通道间幅相一致性,同时也能减少阵元间互耦的影响。试验结果表明,该校准方法稳定可靠,可有效地实现毫米波阵面的校准,具有广泛的工程适用性。 相似文献
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相控阵阵面在外场进行幅相测试时,地面折射波引起的多路径效应是一个主要的误差来源.文中介绍了一种在短时FFT基础上、从地面折射波叠加在直射波上的合成波信号中求解直射波信号的方法,并通过软件仿真采用了该方法校准幅相误差后、阵面波束性能的改善情况. 相似文献
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Peverini O. A. Addamo G. Tascone R. Virone G. Orta R. 《Microwave Theory and Techniques》2010,58(2):440-450
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14.
Aumann H.M. Fenn A.J. Willwerth F.G. 《Antennas and Propagation, IEEE Transactions on》1989,37(7):844-850
A technique which utilized the inherent mutual coupling in an array to both calibrate and predict the radiation patterns of a phased-array antenna is investigated. The only restriction of the technique is that the ability to transmit and receive with pairs of the array elements is required. The theory associated with array mutual coupling and its relationship to both array calibration and array patterns is discussed. The design of a test bed phased-array antenna is covered. The mutual coupling technique (MCT) is used experimentally to calibrate the test array as well as to predict the array radiation patterns. It is shown that the results obtained by MCT are in good agreement with conventional far-field measurements 相似文献
15.
Electromigration reliability of solder interconnects is dominated by current density and temperature inside the interconnects.
For flip-chip packages, current densities around the regions where the traces connect a solder bump increase significantly
due to the differences in feature sizes and electric resistivities between the solder bump and its adjacent traces. This current-crowding
effect along with induced Joule heating accelerates electromigration failures. In this paper, the effects of current crowding
and Joule heating in a flip-chip package are examined and quantified by three-dimensional electrothermal coupling analysis.
We apply a volumetric averaging technique to cope with the current-crowding singularity. The volumetrically averaged current
density and the maximum temperature in a solder bump are integrated into Black’s equation to calibrate the experimental electromigration
fatigue lives.
An erratum to this article is available at . 相似文献
16.
Martin-Neira M. Suess M. Kainulainen J. Martin-Porqueras F. 《Geoscience and Remote Sensing, IEEE Transactions on》2008,46(3):613-620
This paper describes a practical method to calibrate the microwave imaging radiometer with aperture synthesis (MIRAS) in orbit using external targets. Together with the in-orbit validation of the antenna patterns, the method ensures the generation of valid and calibrated visibilities from raw measurements with minimum impact from instrument errors, particularly antenna errors. It has been possible to devise this strategy only after the derivation of the Corbella equation, which correctly describes how MIRAS works. The proposed in-orbit calibration and validation approach is fully based on this equation. In a markedly different way to the point target response method used to calibrate other imaging systems, the technique put forward is essentially based on measuring a ldquoflatrdquo target such as the cold sky near the Galactic poles. This is why it has been called the ldquoflat target transformationrdquo. 相似文献
17.
J. B. Clegg J. B. Mullin K. J. Timmins G. W. Blackmore G. L. Everett R. Snook 《Journal of Electronic Materials》1983,12(5):879-889
A comparative analytical study has been carried out on a specially doped specimen of cadmium mercury telluride using different analytical techniques in order to calibrate solid source mass spectrographic (SSMS) analyses. It has been shown that the conventional technique for standardisation of SSMS that assumes that the ionisation, transmission and collection efficiency of all elements are equal is incorrect with this matrix and can significantly over-estimate the impurity concentration. Enhancement factors for a range of elements have been determined which permit quantitative analyses to be made. 相似文献
18.
A technique that can be used to calibrate radar cross section (RCS) levels over a wide dynamic range and to establish overall target signature measurement accuracy is presented. It is based on the development of a specially designed calibration target which is characterized by a linear RCS variation with respect to aspect angle. An inverse scattering technique based on geometrical optics approximation is utilized to define the surface of such a target. Design data describing the surface dimension as a function of the specified maximum and minimum RCS values were developed, and the limitations of the design technique were investigated. An engineering test model covering a 35-dB dynamic range was constructed to verify experimentally the design linearity. priliminary results were excellent. 相似文献
19.
An improved three-antenna measurement of polarization that greatly reduces the uncertainty due to phase measurement errors is described. This technique is used to calibrate polarization standards and probes used in near-field antenna measurements 相似文献