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1.
研究了小型微带有源相控阵天线中的互耦效应及其校准问题。分析了阵元间互耦对微带阵列天线阻抗特性和辐射特性的影响,对散射矩阵法在互耦校准中的适用性进行了分析,提出了基于有源方向图的互耦校准方法。仿真分析结果表明,对于强互耦情况下小型微带有源相控阵的校准,散射矩阵法存在较大的误差,而有源方向图法更加有效。  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  
焦禹  陈文俊 《电讯技术》2016,56(4):453-457
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.
0513569相控阵天线的互耦和近场校准[刊,中]/李杰//电子学报.—2005,33(1).—119-122(E2)本文在分析相控阵天线近场特性的基础上,根据信号子空间的基本理论,结合模拟退火算法,提出了一种利用近场辅助源估计相控阵天线互耦系数的方法。大量的计算机仿真结果表明,本方法使用校准源少,校准源到天线阵距离近,算法稳健,即使在雷达工作、并  相似文献   

4.
MCM法可以在没有微波暗室或外场条件不理想的情况下对大型阵列进行校准。文中将此方法应用于大型有源相控阵二维阵列校准,得到了基于MCM法的二维阵列口径分布推导公式,对该方法应用于二维阵列时的新特点新问题进行了分析,比较了不同推导方式下的阵列性能差异,并进一步对该方法的误差统计特性参数进行了研究,最后提出了MCM法在工程应用中需要注意的问题和应对措施。  相似文献   

5.
大型固定式有源相控阵天线系统性能测试技术   总被引:1,自引:0,他引:1  
吴祖权 《现代雷达》2005,27(5):72-74
文献[1~6]对相控阵天线校正与测试技术进行了讨论。文中将给出大型固定式有源相控阵天线系统性能测试技术,在整个测量过程中,利用有源相控阵的系统资源和旋转矢量法对阵面性能进行测试,给出了测试结果并进行了比较,理论分析和实验结果表明该方法在实际工程应用中具有重大的实用价值。  相似文献   

6.
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  
李迪  王华 《现代雷达》2005,27(7):48-50
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   

7.
相控阵天线近场幅相校准   总被引:1,自引:0,他引:1  
介绍了一种相控阵天线近场幅相校准的新方法,它不仅能校准相控阵的通道幅相差异还能对互耦进行校准.并且这种校准方法具有设备量小,稳定可靠的优点,具有广泛的工程适用性.  相似文献   

8.
基于旋转矢量法的有源相控阵天线中场测量   总被引:1,自引:0,他引:1  
崔卫东  钟华 《现代电子技术》2011,34(15):117-120
中场测量技术所需设备量较少,成本较低,而旋转矢量法利用相控阵天线本身的波控系统测量阵面的幅相分布。两种测量各有优缺点,将这两种方法结合起来,可实现对有源相控阵天线的TR组件监测和相控阵天线的阵面幅相测量。与近场测量相比,该方法简单易行,可以实现有源相控阵天线的定期监测和校正,同时,对测量中的误差进行了分析,并提出了解决办法。  相似文献   

9.
相控阵天线的互耦和近场校准   总被引:9,自引:0,他引:9       下载免费PDF全文
李杰  高火涛  郑霞 《电子学报》2005,33(1):119-122
本文在分析相控阵天线近场特性的基础上,根据信号子空间的基本理论,结合模拟退火算法,提出了一种利用近场辅助源估计相控阵天线互耦系数的方法.大量的计算机仿真结果表明,本方法使用校准源少,校准源到天线阵距离近,算法稳健,即使在雷达工作、并且存在其它未知信号时,也能准确估计出天线阵的互耦系数.  相似文献   

10.
相控阵天线的互耦和近场校准   总被引:4,自引:1,他引:4       下载免费PDF全文
范瑜  金荣洪  耿军平  刘波 《电子学报》2004,32(12):1997-2000
本文在分析相控阵天线近场特性的基础上,根据信号子空间的基本理论,结合模拟退火算法,提出了一种利用近场辅助源估计相控阵天线互耦系数的方法.大量的计算机仿真结果表明,本方法使用校准源少,校准源到天线阵距离近,算法稳健,即使在雷达工作、并且存在其它未知信号时,也能准确估计出天线阵的互耦系数.  相似文献   

11.
基于PARAFAC与阵列旋转的阵列标校方法   总被引:1,自引:0,他引:1  
该文研究直接序列扩频通信系统天线阵列标校问题.提出了一种基于PARAFAC与阵列旋转的阵列标校方法.该方法利用直接序列扩频通信信号特点以及平行因子的分析方法对阵列通道参数进行估计,并结合天线阵列的旋转技术得到一种阵列有源标校方法.该方法无需知道标校源信号的波达角,就可对阵列进行标校,给实际应用带来方便.仿真结果表明该方法可行、有效.  相似文献   

12.
Adaptive antennas are recognized as a means of increasing the performance of communications systems. However, practical realization of such systems relies on suitable calibration of distortion effects caused by the circuitry and antenna structures. This work presents a detailed analysis of the classes of distortion that degrade the performance of adaptive antennas. This uses the results of an adaptive antenna testbed employing an eight-element circular array to illustrate the impact of temperature on performance. Design techniques that aid calibration are then described. In particular, digital downconversion, array design, harmonic sampling, sample clock dither, and clock management are discussed as a means of designing an adaptive array with the calibration problem in mind.  相似文献   

13.
刘松  廖勇  谢远举 《电子学报》2017,45(9):2170-2176
紧凑均匀圆阵(UCA)的强电磁互耦效应严重影响波束赋形(BF)和波达方向(DoA)估计的性能,本文利用UCA的特殊圆对称性,提出了一种稳健高效的互耦参数校正方法.该方法只需要单个信源和单次校正实验,并且信源方向并不需要事先精确校准.首先互耦矩阵在离散傅里叶空间被转化为具有中心对称的一个参矢量,随后在一个有限的先验二维空间角域内进行搜索,从而根据基于对称性的目标函数将互耦参数估计出来.仿真对比实验验证了新校正算法的有效性和鲁棒性,同时揭示了秩损(RARE)校正方法不够稳健,为基于UCA的雷达、移动通信等应用提供了简单且高效的互耦误差校正方法.  相似文献   

14.
In this paper, we investigate array calibration algorithms to derive a further improved version for correcting antenna array errors and RF transceiver errors in CDMA smart antenna systems. The structure of a multi‐channel RF transceiver with a digital calibration apparatus and its calibration techniques are presented, where we propose a new RF receiver calibration scheme to minimize interference of the calibration signal on the user signals. The calibration signal is injected into a multichannel receiver through a calibration signal injector whose array response vector is controlled in order to have a low correlation with the antenna response vector of the receive signals. We suggest a model‐based antenna array calibration to remove the antenna array errors including mutual coupling errors or to predict the element patterns from the array manifold measured at a small number of angles. Computer simulations and experiment results are shown to verify the calibration algorithms.  相似文献   

15.
Directions of arrival (DoAs) estimation of multiple sources using an antenna array is a challenging topic in wireless communication. The DoAs estimation accuracy depends not only on the selected technique and algorithm, but also on the geometrical configuration of the antenna array used during the estimation. In this article the robustness of common planar antenna arrays against unaccounted mutual coupling is examined and their DoAs estimation capabilities are compared and analysed through computer simulations using the well-known MUltiple SIgnal Classification (MUSIC) algorithm. Our analysis is based on an electromagnetic concept to calculate an approximation of the impedance matrices that define the mutual coupling matrix (MCM). Furthermore, a CRB analysis is presented and used as an asymptotic performance benchmark of the studied antenna arrays. The impact of the studied antenna arrays geometry on the MCM structure is also investigated. Simulation results show that the UCCA has more robustness against unaccounted mutual coupling and performs better results than both UCA and URA geometries. The performed simulations confirm also that, although the UCCA achieves better performance under complicated scenarios, the URA shows better asymptotic (CRB) behaviour which promises more accuracy on DoAs estimation.  相似文献   

16.
The design, packaging approach, and experimental evaluation of the free-space accelerator for switching terabit networks (FAST-Net) smart-pixel-based optical interconnection prototype are described. FAST-Net is a high-throughput data-switching concept that uses a reflective optical system to globally interconnect a multichip array of smart pixel devices. The three-dimensional optical system links each chip directly to every other with a dedicated bidirectional parallel data path. in the experiments, several prototype smart-pixel devices were packaged on a common multichip module (MCM) with interchip registration accuracies of 5-10 μm. The smart-pixel arrays (SPAs) consist of clusters of oxide-confined vertical-cavity surface-emitting lasers and photodetectors that are solder bump-bonded to Si integrated circuits. The optoelectronic elements are arranged within each cluster on a checkerboard pattern with 125-μm pitch. The experimental global optical interconnection module consists of a mirror and lens array that are precisely aligned to achieve the required interchip parallel connections between up to 16 SPAs. Five prototype SPAs were placed on the MCM to allow the evaluation of a variety of interchip links. Measurements verified the global link pattern across several devices on the MCM with high optical resolution and registration. No crosstalk between adjacent channels was observed after alignment. The I/O density and efficiency results suggest that a multi-terabit switch module that incorporates global optical interconnection to overcome conventional interconnection bottlenecks is feasible  相似文献   

17.
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  
刘邦余 《现代雷达》2001,23(4):20-23
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   

18.
Peak factor in orthogonal multicarrier modulation with variablelevels   总被引:1,自引:0,他引:1  
Wulich  D. 《Electronics letters》1996,32(20):1859-1861
Usually in multicarrier modulation (MCM) the level of the modulated signal is constant and does not depend on the specific vector of information symbols which are actually transmitted. In such a case the value of peak factor (PF) for an MCM signal composed N carriers is 10 log10N [dB]. The author proposes a method for reducing the PF, where for each vector of information symbols, for which the maximum of the instantaneous envelope power exceeds some given threshold value, the amplitudes of all carriers are uniformly reduced to obtain equality between the maximum of the instantaneous envelope power and the threshold. Moreover, for each vector of symbols, for which the maximum of the instantaneous envelope power is lower than the threshold, the amplitudes of all carriers are uniformly increased to obtain equality. Thus the PF of the whole modulation is reduced without reducing the net bit rate. The price paid for reduction of the PF is an insignificant increase in bit error rate (BER)  相似文献   

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