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随着卫星移动通信技术的发展,一种能适合机载和地面移动载体卫星通信的天线越来越受到人们的青睐。该种天线要求具有宽频带、圆极化和电扫描跟踪等特性。矩形腔十字裂缝天线就是这种天线理想的辐射单元之一。基于矩量法的分析途径,本文提出了计算矩形腔十字裂缝天线的数值方法,给出天线单元的输入阻抗、增益和轴比等辐射特性的数值结果,并进行了实验实证。理论和实验结果有着很好的一致性。 相似文献
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针对卫星导航系统对天线的新需求,结合阵列天线的特点,本文介绍了阵列天线在导航系统中的应用现状,展望了阵列天线在我国卫星导航系统中的应用前景,并对几种阵列天线关键技术进行了探讨。最后,在导航系统空间段、控制段和应用段,分别给出了几种可行的阵列天线解决方案。 相似文献
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文章介绍了当前5G移动通信的发展情况、MIMO技术的应用原理及优势、5G移动通信阵列的天线建模方法与模型的比对,并以5G移动终端为例,叙述MIMO技术融入到移动通信阵列天线建模中的方法,以期通过将MIMO技术应用到5G移动通信天线阵列中的方式,向用户提供稳定安全的信息通道。 相似文献
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介绍国内两种车载同步轨道卫星移动通信系统。一种是相控阵天线跟踪的UHF频段卫星移动通信系统。另一种是采用激光陀螺跟踪的Ku频段宽带卫星移动通信系统,它综合应用了航天遥测、激光陀螺、GPS定位和Ku频段数字卫星通信等技术,在国内首次实现了话音、传真、数据和图像宽带大容量动中不间断通信。 相似文献
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提出并实现了一种利用卫星信标信号来实施基于相控阵天线的波束跟踪算法。该方法适用于采用相控阵天线技术的各种卫星"动中通"天线,克服了卫星信标信号强度弱,检测困难的弱点,提高了跟踪信噪比,同时采用了软件无线电方式解调可以提供最大的灵活性。跟踪算法的最大优点是没有任何陀螺仪的辅助,极大地提高了天线在各种极端运动环境下的适应能力。算法最终在自行研制的Ku波段相控阵移动卫星天线系统上获得验证。 相似文献
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Shingo Ohmori 《电信纪事》1999,54(1-2):93-102
An antenna system including antenna elements and a tracking method is considered a key technology in mobile communication systems. A phased array antenna has been considered the most favorite candidate because of many attractive characteristics such as a low and compact profile, high-speed tracking and potentially low cost performance for vehicle antennas in mobile communications. On the other hand, it has several such disadvantages as beam steering error, loss in feed lines and an increase of noise level in a receiving frequency band. Some of phased array antennas have already been used in satellite communications, and some of them are under development. This paper overviewed basic performance and some examples of phased array antennas for especially satellite mobile communications. 相似文献
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赵亚东 《电信工程技术与标准化》2017,(1)
随着我国社会经济科技等领域的飞速发展,卫星导航技术在经济建设中占有越来越重要的位置。同时,以提供定位服务的小区密集化、大规模阵列天线等技术为代表的5G通信为导航通信一体化奠定了基础。卫星导航和5G移动通信技术的融合,将极大地扩展导航的范围,提升导航的精度。本文综合国内外最新研究成果,首先提出了卫星导航与5G移动通信融合体系架构;然后在总结A-GNSS技术的基础上,阐述了基于5G的A-GNSS系统架构和关键技术;最后,在介绍5G基站定位技术的基础上,全面详细地阐述了卫星导航与5G混合定位架构和关键技术。 相似文献
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Ung Hee Park Haeng Sook Noh Seong Ho Son Kyong Hee Lee Soon Ik Jeon 《ETRI Journal》2005,27(3):243-249
A mobile antenna for multimedia communications with Ku‐band geostationary satellite KOREASAT‐3 and JSAT‐2A is presented. The forward link of the satellite communication is 11.7 to 12.75 GHz, and the return link is 14.0 to 14.5 GHz. The mobile antenna is designed to be a stair structure using 24 active phased array elements in order to provide a low profile, and to be at a non‐periodic array distance using the genetic algorithm. Also, the designed antenna uses the double beam forming method for stable satellite tracking. The fabricated mobile antenna is examined using various experiments to confirm its capability for practical application. From the measured results, the fabricated mobile antenna system is confirmed to have a good performance. 相似文献
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Blind adaptive beamforming for cyclostationary signals 总被引:7,自引:0,他引:7
Qiang Wu Kon Max Wong 《Signal Processing, IEEE Transactions on》1996,44(11):2757-2767
In order to increase the capacity and to suppress co-channel interference in digital communication systems such as mobile cellular and mobile satellite communication systems, the employment of array beamforming techniques has been proposed. However, conventional beamforming methods are not suitable for such cases since these methods were mainly developed for signal detection and direction-of-arrival (DOA) estimation in radar and sonar. In this paper, utilizing the cyclostationary properties of communication signals, we propose three blind cyclic adaptive beamforming (CAB) algorithms and their fast implementation schemes. Several numerical examples are included. These results demonstrate that the CAB algorithms are good candidates for spatial reuse of frequency spectrum in digital mobile communication systems of the next generation 相似文献
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本文介绍了一种应用于卫星通信的车载光控相控阵天线的关键技术设计,并对天线元、天线阵和光真延时等关键部件进行了仿真,表明采用光真延时技术的相控阵天线具有宽频宽角扫描的特点,可以较好地解决传统相控阵天线无法应用于宽带通信系统的问题。 相似文献