卫星通信

Finally, applications of the anomalous propagation of microwave in tropospheric ducts are discussed: in connection with concrete radar parameters, effects of ducts on radar range and detection performance are discussed, the results obtained are of great value for the overall design of radar systems; by use of the interference standards of ITU-R, the co-ordination area of satellite earth-station under tropospheric ducts environment is studied ; by explaining the relationship between evaporation duct and advection fog, a new way to forecast sea advection fog from evaporation duct is provided.

最后讨论了对流层大气波导环境下电波异常传播特性的应用：结合具体的雷达系统参数，模拟计算了大气波导对雷达作用距离及发现概率的影响，对雷达系统的总体设计具有重要的参考价值；对表面大气波导环境下的卫星地球站通信协调区域进行了确定，从理论上很好地给出了协调距离量级的概念，为卫星地球站与地面微波站之间的协调提供了依据和参考；分析了利用海面蒸发波导来快速预测平流海雾的新方法，完善了平流海雾的预报方法，对海上安全作业和生产具有重要的意义。

Chapter one and chapter two analyse the basis theory and give a whole design plan and expatiate the basic exoterica of system inculding primary technology for application. It involves the basic control theory of satellite antenna and analyse for the whole function. Chapter three gives the hardware design which includes hardware etlectrocircuit structure, principle chart, selecting all kinds of parts of the apparatus , the sensor elements and the design of serial communication electrocircuit etc. Chapter four and chapter five introduce software design for the SCM and the personal computer, giving mainly design theory and material program which includ the design of searching for the satellite and searching for the high-point and the program development by Delphi on PC, explaining the basic principium of asynchronous serial communication for epigyny computer and hypogyny computer.

第一、二两章阐述了系统的理论基础及应用的主要技术，包括卫星天线控制基础理论和整体功能分析等等；第三章是系统硬件设计，包括硬件电路组成及原理图、各类元器件的选取及传感器原理，串行通信电路设计等：第四、五两章是单片机、PC机软件设计，给出了主要部分的设计原理及具体程序，包括监控软件设计、寻优设计、寻星设计，PC端Delphi程序设计开发等，并阐述了PC机和单片机异步串行通信的基本原理，是本课题的重点所在。

So that to make sure the beacon continually appears on the center of CCD.The technology of ATPis the key technology for space laser communication among moving platforms and has great applied future in the area of large data communication,such as satellite,avigation and spaceflight.

移动平台ATP技术是实现空间激光通信的关键技术，在卫星和航空航天等大容量通信方面具有巨大应用前景。

In this paper, we mainly study the system performance and key technologies of satellite optical CDMA communication system.

给出了卫星二维光CDMA通信系统方案和系统模型，并分析了该通信系统的系统性能。

The development of spaceflight, communication and satellitetechnology makes the building of satellite multipurpose information network possible.

航天技术、通信技术、和卫星技术的发展，使卫星综合信息网的建立成为可能。

Satellite channel simulator can simulate transmission characteristics of electromagnetic wave close to real channel environment.

卫星移动通信系统已经成为当前通信领域中发展非常迅速的研究方向和现代化通信强有力的手段之一。

State-of-the-art equipment to suck up electronic communications, including telephonecalls, e-mail, ship-to-shore relays, faxes and satellite transmissions. Basically

军事情报官员将EP-3E军用电子侦察机形容成为空中吸尘器，它采用精密复杂的电子设备来"吸收"包括：电话，电子邮件，船岸间通信信号转播和卫星信号传输在内的电子通信信息。

The Beidou navigational system is characterized by the technical dominance of locating and navigation, data communication, noting time and also by the features of all-day-and-night long, totipotent, real time and continuity.

北斗卫星定位导航系统是我国完全自主知识产权的军民共用卫星定位导航系统，北斗导航系统具有集定位导航、数据通信、授时三大功能为一体的技术优势和全天候、全能性、实时性、连续性的工作特点。

Double-Layered satellite networks consisting of LEO and MEO satellites have advantages on networking and communication performances.

由低轨LEO和中轨MEO卫星构成的双层卫星网络具有较好的组网通信性能。

A LEO and a MEO constellation schemes for China are designed in this chapter with the method. The statistical results have shown that the coverage performance of these two schemes is excellent.

区域性卫星移动通信系统对于发展中国家具有十分重要的意义，特别是对于中国这样幅员辽阔且在广大农村地区缺乏基本通信手段的国家。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐