导航系统

with the development of satellite navigation communication,antenna is a very important unit,performance of the satellite navigation communication system is affected by it partly.a new type of bifilar helix for satellite navigation communication system is introduced,and the traving-wave bifilar helix is analyzed briefly.meanwhile,the design and the test results are given.the results show that the antenna possesses excellent circular hemispherical beam with wide angle circular polarization and better impedance match,and has a compact structure and high integration.it can be applied in caps systems successful.

小 摘要：随着卫星导航通信技术的迅速发展，天线作为卫星导航通信系统中的重要部分，在一定程度上决定着卫星导航通信系统的性能。介绍一种用于卫星导航通信系统的双臂螺旋天线，讲述爬行波式螺旋天线的设计过程，并给出最终测试结果。结果表明，该天线具有优良的圆对称半球波束，良好的广角圆极化特性和优良的阻抗匹配特性，其结构简单、紧凑，为通信入站回传提供了一种优良的选择。

GTE is located in PANYU GUANGZHOU where has a convenient traffic and beautiful surroundings, covering 55000 square meters area,Coagent has 500 employees among whom there are 135 professional technicians,"FORMAN" of GTE become a famous brand of "Built-in GPS+DVD navigation system","FORMAN" products, including car system of DVD+GPS, GPS+PMP,AV and Audio, have been made rapid progress in car component ,car market and oversea export market, and made great success in becoming competitive car DVD+GPS+TV system products of many SUV car and sedan manufacturers and GTE has obtained good praise of the native and oversea car manufacturers.

广州市国通汽车有限公司，创立于1994年，座落于交通便利、环境优美的广州市番禺区，占地面积近55000平方米，精英汇集，技术力量雄厚，是专业研发、生产和销售车载和便携GPS/DVD全球卫星定位导航多媒体影音系统、汽车电子智能控制系统等电子产品的高科技企业，旗下拥有"Forman大众领航"品牌，在汽车导航影音系统以及便携式汽车导航产品等领域引领着行业的前沿，国通优质的汽车电子产品在汽车售后市场、海外出口和整车配套三大块市场均取得了长足的发展。

Simulation model （subtopic 3.2）, and the real-time implementation of simulation （subtopic 3.3）; in subtopic 3.2, we point out that our simulation model should select Adams Prediction-Correction integration method for handling the complexity of AUV model and that the step length of integration should be 10 ms ; to sum up, our simulation system, using a high-performance industrial control computer, can real-timely simulate dynamics of underwater vehicle and its sensors and executors by using multi-function data acquisition card and serial ports.

该半实物仿真系统由实时仿真计算机和真实的导航控制计算机构成，实时仿真计算机完成AUV空间运动的实时积分解算，并利用多功能数据采集卡和串行通讯端口模拟AUV导航控制系统中的传感器和操舵机构的工作，为导航控制计算机提供全真的软硬件工作环境，使开发人员在此基础上能够完成导航控制软件全部功能的开发，并进行全面、有效的系统级软件测试，具有非常高的工程实用价值。

Computer numeric simulation and halfˉstuff simulatio n were put on control system.

基于小扰动理论，建立简易制导航弹的扰动方程，给出简易制导航弹控制系统的数学模型，进行简易制导航弹的气动计算，结合制导控制系统的设计对制导系统参数进行优化设计，并对制导控制系统进行计算机数字仿真、半实物仿真。

In the second part, introduce the problems in developing our countrys UNIS, face to the problems, bring forward the countermeasure, in this part, the article also demonstrate the feasibility to build the UNIS.

第三部分：介绍了车载城市导航信息系统的开发设计方案，主要包括系统的需求分析、系统总体设计、系统设计原则、系统开发方式的选择、系统的开发环境、系统开发关键技术阐述、导航电子地图设计、导航信息系统功能设计等。

With improvement in guide system, it's an easy thing for flying in a heavy frog or a rainstorm.

由于改进了导航系统，所以在大雾和狂风暴雨中飞行早已成常事。

The radio/navigation system plus, featuring a large-format color monitor and MMI keypad, combines extensive functionality with extreme userfriendliness.

无线电/导航系统，并具有大幅面彩色显示器和MMI键盘，结合了极端userfriendliness广泛的功能。

At last, the dissertation is summarized. The next work steps and future development of AVN system are also given.

最后，对本文做了总结，并展望了今后的工作思路和汽车自主导航系统的发展与未来。

Facing the more and more tense international situation at present, a large number of stock aerial bomb should be reconstructed in our country , which is not only armys modernized need but also a need of the international politics and military affairs situation too.

鉴于本文所研制的惯性组合导航系统主要立足于对现有普通航弹进行制导化改造，经费较少，因此在选用惯性元器件和GPS接收机等各部分相应产品时要尽量达到最佳的性价比。

Already Renault has slashed output at its large Valladolid plant in northern Spain, It does not take a satellite navigation system to see where the European car industry is going.

雷诺公司已经大幅削减在西班牙北部瓦利阿多里德大型生产车间的产量。现在，不需要卫星导航系统就可以了解欧洲轿车行业的发展走势。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。