通信系统

Air China has developed on its own the operation management system, integrated satellite telephone system, space data communication system and shortwave wireless system, which made it the first airline company with the super long-distance supervision capacity in the country. In 2004, after the use of shortwave communication systems, the supervision network which has Beijing and Lhasa as the core, covers the Asian continent, the Indian Ocean and Pacific Ocean stretching to the arctic pole area.

国航自行研制开发了运行管理系统，集成了卫星电话系统、空地数据通讯系统和短波无线电系统，使国航成为国内第一家具有超远程监控能力的航空公司，尤其是2004年短波通信系统的投入使用，形成了以北京、拉萨两点为圆心，全方位、全时空、全天候覆盖亚洲大陆、印度洋和太平洋，并延伸到北极区域的监控网络。

Mechanical system includes mechanical structure design of exploring head, measuring and controlling box. Circuit system includes the least system of S3C44BOX automatic gathering system、 man- machine vision system、 circuital schematic diagram and PCB design of communications system.and completion of correlative function drive software.

机械系统包括测头和测控箱的机械结构设计，电路系统设计包括S3C44BOX的最小系统、自动采集系统、人机界面显示系统和通信系统的电路原理图和PCB设计，以及相关功能驱动软件的编制。

They are: Shenzhou manned spacecraft system, rocket system, long march, the astronauts systems, launch systems, spacecraft monitoring and control and communications systems, landing field system, scientific research and technology test system.

他们是：神舟号载人飞船系统、长征运载火箭系统、航天员系统、发射场系统、飞船测控与通信系统、着陆场系统、科学研究和技术试验系统。

A new type of point to multipoint communication system with switching capability is presented in this paper.

本文提出一种新型的具有交换功能的点对多点通信系统，给出了交换网络结构与控制系统设计方案，结合SCPB-TDM/TDMA多址方式和特定的系统传输帧结构设计，讨论分析了实现中心站和用户站两级交换控制所需解决的问题，包括信令系统、按需分配系统及话务容量分析等。

SPWM full-bridge inverter and isolating transformer output makes UPS own superstrong load shock capacity as well as computers,network,military communication system,satellite communication system,high-grade medical equipment,precision instruments and equipment,monitor protection system,statellite communication system,fire fighting illumination system,financial securities network,broadcasting station sending and receiving system as well as jinformation transmission system.

适用于：计算机及网络系统、军用通讯系统、卫星通信系统、高级医疗设备、精密仪器设备、监控保安系统、消防照明系统、金融证券网络、电台发射及接收系统、信息传输系统等领域。

Wireless Communication System Simulation Theory and Application of Chapter IV of the program is on the bandpass signal and system low-pass simulation model.

详细说明：通信系统仿真原理与无线应用第四章的程序，是关于带通信号与系统的低通仿真模型的。

Wireless Communication System Simulation Theory and Application of Chapter IV of the program is about the bandpass signal and system low-pass simulation model.

详细说明：通信系统仿真原理与无线应用第四章的程序，是有关带通信号与系统的低通仿真模型的。

According to the invention, at least two radiocommunication systems overlap spatially and the radio interface in a radiocommunication system comprises at least a first and a second frequency band.

本发明的出发点在于，至少有两个无线通信系统在空间上重叠，而且在一个无线通信系统中无线电接口包括至少第一和第二频带。

Instead of allocating several frequency bands block by block to a radiocommunication system, at least one frequency band of another radiocommunication system is arranged between the frequencies of the first and second frequency band, whereby a minimum distance is created between the frequency bands used in a location.

在频率分配的意义上讲，不是成块地给一个无线通信系统分配多个频带，而是在所述第一和第二频带的频率之间设置了其它无线通信系统的至少一个频带。于是在一个位置处使用的频带之间具有一个最小间隔。

In order to provide confidential and integrated communication service for group applications, PAGKA, IAGKA and AGDH are implemented and integrated with a reliable group communication system Spread to constitute a layered secure group communication platform prototype.

为了向群应用提供保密和完整的通信服务，本文实现了AGDH、PAGKA和IAGKA三种方案，并与可靠的群通信系统Spread集成起来，构建了一个分层的安全群通信平台原型。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。