卫星通信

Under the contract, a Lockheed Martin-led industry team will develop three types of expendable communications buoys: two submarine-launched tethered buoys that provide real-time chat, data transfer and e-mail capabilities via either Iridium or UHF satellites; and an untethered, acoustic-to-radio frequency gateway buoy that can be launched from a submarine or maritime patrol aircraft to enable two-way data transfer between a submerged submarine and surface assets.

根据合同，洛克希德马丁公司领导的工业团队将开发三种类型的消耗通信浮标：两个潜艇发射栓浮标提供实时聊天，数据传输和电子邮件功能，通过任何铱星或超高频卫星；和非系留，声学对无线电频率网关浮标，可以从潜艇发射或海上巡逻机，使双向之间的数据传输水下潜艇和水面资产。

This problem has long vexed the American military, which would like to use lighter-than-air dirigibles as atmospheric satellites, or stratellites.

这个问题很长时间一直使美国军方苦恼，美国军方打算用像大气卫星或商用平流层通信飞艇一样比空气轻的飞船。

Firstly, it receives and processes the data from GPS , taximeters , and IC card . Secondly, it displays them on LCD. Finally, it transmits these data to monitor center with serial port.

主要完成GPS卫星数据、计价器数据、IC卡数据的接收和处理，并将获取的数据在液晶显示器上显示，同时将数据及车辆的运行状态、报警状态通过通信链路发送到监控中心。

Our focus is the commercial telecommunication and wireless technology industries, with extensive experience with a range of products including power dividers, phase shifters, striplings, patches, combiners, base station, GPS and satellite automotive antennas.

我们专注于商业通信和无线技术领域，在多个领域有着丰富的产品研发和生产经验，如：功分器、耦合器、相移器、微带天线、片状天线、基站，GPS和汽车卫星天线等。

Along with the development of modern correspondence, the numeralturns increasingly daily life of permeating people, the people'sneed to various multi-media business increases increasingly, we areenjoying numeral to turn the convenience for bringing with fast,the satellite television, numerical television, various figuresmusic product is changing our lifes.

随着现代通信的发展，数字化日益渗透人们的日常生活，人们对各种多媒体业务的需求日益增长，我们正享受着数字化带来的方便和快捷，卫星电视、数字电视、各种数码音乐产品正改变着我们的生活。

The main purpose of the paper is to study the carrier frequency synchronization problem and its application in satellite payload communication systems.

论文在深入分析OFDM各种载波频率同步方法的基础上研究卫星有效载荷通信中的频率同步技术。

The results are applicable to the missions which require north-south station keeping accuracy of 0.05°～0.1° and have been implemented in flight control of the Chinese STW-2 satellite.

本文结果适用于南北位置保持精度为0.05°至0.1°的任务，并且已经应用于我国实用通信广播卫星的飞行控制。

Firstly, the SPN model for a single-layered LEO satellite network under half duplex mode is constructed. Then, average time delay is chosen as a key performance index to evaluate the network performance of the constructed SPN model with SPNP 6.0 software. Furthermore, the effects of arrival rate, network load, message number on average time delay are also analyzed.

首先建立了半双工通信模式下LEO单层卫星网络的SPN模型，并选取平均时延作为网络性能评价指标、采用SPNP6.0软件对该SPN模型进行了性能评价，分析了数据包到达速率、网络负载以及消息数等参数对网络平均时延的变化关系。

The experimental communications satellite sent into orbit was already beaming back revolutionary songs to a grateful nation, and rocket technicians were weeping "tears of joy".

被送入轨道的通信实验卫星已经开始为伟大的国家定向发回革命歌曲，而这使火箭科学家们&喜极而泣&。

Want to decide the azimuth of a mobile phone has two kinds of methods normally: The first kind of method is the GPS chip that the mobile phone uses, pass the satellitic network that in the sky covers the world and wireless communication to identify the trend with located mobile phone; The 2nd kind of method is three angular distance calculate a standard, mobile phone to around base the station issues signal, differ through calculating signal to arrive at base the time of the station will determine the mobile phone is located azimuth.

要确定一部手机的方位通常有两种方法：第一种方法是手机使用的GPS芯片，通过覆盖地球上空的卫星网络和无线通信来识别手机所处的方位；第二种方法是三角距离测算法，手机向四周的基站发出信号，通过测算信号抵达不同基站的时间来测定手机所处方位。

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