大功率短波发射机天馈线系统相关问题研究

大功率短波发射机天馈线系统主要用于远距离传输信号.本文首先介绍了天馈线系统的天线、馈线和匹配网络等三个主要部分的基本工作原理,然后分别介绍了大功率短波发射机天线系统和馈线系统的应用,最后以馈线系统为例,详细分析了影响天馈线系统辐射效率的多种因素,并给出了设计高辐射效率的馈线系统的基本要求.     

基于FPGA的智能天线数字波束形成设计

通讯系统的频谱资源日益紧张,智能天线是增加系统容量最有希望的解决方法之一。智能天线的数字波束形成是通讯系统实现空分多址的基础。在介绍了数字波束形成的基本原理基础上,提出了一种基于FPGA实现的实时数字波束形成方法,并使用嵌入式逻辑分析仪进行了实测分析。实验结果表明,该数字波束形成设计能实时调整各通道的幅度和相位,实现数字波束形成。     

基于FPGA的数字波束形成系统的设计实现

针对在阵列信号处理中有着广泛的应用的数字波束形成技术,提出利用FPGA实现的数字波束形成器来解决多通道波束形成系统的方法,介绍系统的原理、组成结构和实现方法.     

波束赋形技术原理及其在LTE系统中的应用

介绍了波束赋形技术的两种形式:基于信号入射方向的波束赋形(DOA-based beamforming)和依靠信道相关矩阵主特征值的波束赋形(Eigen beamforming),阐述了它们二者的原理和相关推导。并且简要介绍了后者波束赋形技术在LTE系统中的实现(以TM7波束赋形的简要实现为例)。     

全空域相控阵测控系统波束形成分析

全空域相控阵测控系统作为下一代地基航天测控系统发展趋势,其系统架构和波束形成等关键技术值得深入研究。介绍了全空域相控阵测控系统实现方案,分析比较了3种备选波束形成方法。在此基础上,对共形球面阵波束形成技术进行了分析与仿真,仿真结果验证了系统波束形成设计思路。     

TD—LTE系统天馈演进策略探讨

本文首先对TD—LTE（D频段）与TD—SCDMA（F、A频段）共用天馈线的性能进行了理论分析,针对共用天线引起的控制信道（无波束赋形）和业务信道性能变化进行了系统仿真验证,随后针对TD—LTE室内分布的天馈形态进行了分析,最后针对TD—LTE天馈线的工程实施方案进行了探讨。     

一种毫米波二维电扫有源相控阵雷达

采用多波束开关馈线与相控波束扫描相结合的技术实现了一种低成本毫米波 二维电扫描有源相控阵雷达。该雷达主要包含电扫的关键组件Rotman透镜与多端口TR组件, 配以高 性能的模块化数字信号处理机。试验结果表明,该雷达能实现动目标检测与跟踪、前斜视调 频步进SAR成像与扇扫成像。     

多波束形成技术研究

讨论了跟踪与数据中继卫星系统 (TDRSS)中关于多波束形成的算法 ,优选的有LMS自适应方式和相位调整自适应方式 ;并简单介绍了波束控制和波束形成的实现     

一种基于FPGA的雷达波束控制系统设计

为了达到波束控制高效、低成本和小型化的目标。在此介绍一种基于FPGA的相控阵雷达波束控制系统硬件平台及其软件设计。系统采用FPGA作为波束控制算法实现的核心,选用单片机实现阵面组件驱动部分的控制调试,在此硬件平台上,开发一种用硬件描述语言和单片机汇编语言与VB语言设计相结合实现的波束控制系统。设计的系统设备量少,控制和调试功能完善,适宜于推广到集中式运算、分布式驱动的波束控制体系。     

深圳电视塔天馈线系统浅析

本文介绍了深圳电视塔天馈线系统设计理念、设计思路及系统配置,分析了天馈线系统原理和系统配置特点。深圳塔的天馈线系统具有一定代表性和先进性,对大型广播电视发射塔的天馈线系统设计和配置选型可提供一些参考和借鉴。     

The Design and Planning of Feeder Links to Broadcasting Satellites

A feeder link is the portion of a broadcasting-satellite system which provides the connection from the earth to the broadcasting satellite. Quality objectives for feeder links are normally well above the corresponding objectives for downlinks. The parameters which affect signal quality are examined. It is shown that the greatest control over theC/Nratio lies with the selection of suitable values for the diameter of the feeder link transmit antenna and the power of its associated transmitter. Three mechanisms are available to combat interference between feeder links: discrimination resulting from the feeder link transmit antenna pattern, discrimination derived from the satellite receive antenna pattern, and discrimination due to the use of cross-polarized signals. The use of these mechanisms to create a workable feeder link plan is developed in the paper. There are a number of desirable objectives that can be established for a feeder link plan in addition to the obvious need to meet signal quality (C/N) and interference (C/I) requirements. A realizable set of objectives is presented along with the approaches used at the ITU Region 2 planning conference to create a satisfactory plan. The technical parameters which must be agreed on in order to develop a feeder link plan are summarized, and the values chosen for the Region 2 plan are presented.     

网优天馈系统维护工作经验

在网络优化中经常会遇到与天馈有关的问题.本文主要介绍了天馈线的常见故障及处理方法,天馈线的保养知识及天馈优化的意义等,本文中所示案例均为在日常工作中处理的典型案例.希望通过此文与大家互相交流,共同提高维护水平.     

5G 2.6 GHz与700 MHz频段基站天线建设策略

针对中国移动基站天馈“两多一快”特点及面临的天面租金贵、资源紧张挑战,提出统筹考虑制式频段、采用多频段多端口独立电调天线进行天面整合的天馈建设总体思路。确定以单小区2天面为主的天面目标,“有源、无源分割”、“TDD、FDD分割”的天馈整合原则。统筹考虑5G 2.6 GHz与700 MHz,结合后续5G建设节奏,确定4个场景大类,分别提出细化天馈整合建设方案,进行5G天馈整合天线需求预估,并提出5G天馈建设建议。     

Sleeve antenna with ground wires

Pocklington's integral equation for a sleeve antenna with ground wires is formulated. By applying the Galerkin method to this equation, a sleeve antenna, a monopole antenna with ground wires, and a sleeve antenna with ground wires are analyzed, and numerical results for these antennas are compared with measured data. The sleeve antenna features the leakage current on the surface of the coaxial feeder, suppressed by a sperrtopf, but it is mismatched with the 50-Ω feeder. The monopole antenna with inclined ground wires may be adjusted to match the 50-Ω feeder, but the leakage current induced on the feeder cannot be neglected. It is found that the sleeve antenna with ground wires has the advantages of both antennas     

WCDMA天馈系统隐性故障定位方法研究

从天馈系统参数与网络性能指标的关联入手,研究高效的天馈排查定位方法,有效发现和整改现网中隐性和显性的天馈问题,并对实施天馈整改的基站进行优化效果验证。     

Optical fiber feeder for microcellular mobile communication systems(H-O15)

The authors investigate the feasibility of using an optical fiber feeder for microcellular mobile communication systems. The optical feeder enables compact and low-cost base stations, easy radio channel control, and flexible mobile communication systems. Basic transmission characteristics were investigated through optical transmission experiments. Using these results, it is estimated that the optical feeder can transmit 880 telephone channels for digital TDM systems and 2000 channels for analog FDM systems through 20 km of optical fiber. Furthermore, two kinds of novel techniques that enlarge dynamic range of the optical feeder are reported     

Power budget analysis of dual/single feeder fiber WDMPON

This paper investigates how to reduce the cost of wavelength division multiplexing passive optical network （WDM- PON） by comparing the transmission performance of bidirectional single feeder fiber and dual feeder fiber. Comparison is performed on the basis of power budgeting and cost of both arrangements. Simulation results using Optisystem show that the performance of a single feeder fiber is almost equivalent to that of a dual feeder fiber. Therefore, the single feeder fiber WDM-PON can efficiently replace the dual feeder fiber WDM-PON with the minimum deterioration in system performance and reduction in cost.     

Methods for Structural Parametric Synthesis of Output Stage of Keying Radionavigation Transmitters with a Feeder

This paper addresses the problem of the directly connected antenna to the keying radionavigation transmitter. The proposed solution to this problem is to connect a feeder between the bandpass circuit of the transmitter output stage and the transmitting antenna. Operational specific features of the keying transmitter of pulse-phase radionavigation system are considered for a long feeder. Methods for the structural parametric synthesis of output stage of a transmitter having a coaxial feeder are proposed in order to generate a signal of prescribed shape.     

cdma2000 1x EV-DO组网方式的探讨

介绍了在进行cdma20001xEV-DO系统规划时,可能出现的各种组网方式及其优缺点;并对1xEV-DO和1x共用天馈线系统和独立天馈线系统,以及连续覆盖和插花式覆盖进行了分析比较。     

浮动式压电振动送料装置的数值研究

利用ANSYS有限元分析软件,对浮动式压电振动输送装置进行了静态分析、模态分析及谐响应分析.明确了振动部件在交流电激励下的振动方式,找到了实现输送目的的振动频率及模态,并分析了浮动式压电振动输送装置的工作原理,为其深入研究提供了理论依据.