导航

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。

In order to ensure the precision and reliability, this paper designs the GPS/Loran C/SINS/AHRS integrated system. In this integrated system, the self-adaptive federated Kalman filter is introduced to revise strap-down inertial navigation system; the heading angle attitude and heading reference system is used to ensure the convergence of heading angle; and the coordination transformation for Loran C is applied to eliminate the constant error of Loran C.

针对导航精度及可靠性，设计了GPS/罗兰C/SINS/AHRS组合导航系统，该组合导航采用了自适应联邦卡尔曼滤波的方法，通过闭环形式校正SINS，并用姿态航向参考系统代替捷联惯性导航系统输出的航向角以保证航向角的收敛，同时对罗兰C的测量值进行坐标变换以消除由于坐标系不同而带来的常值误差。

Global position system can revise the cumulative error of dead reckoning navigation system,such as strapdown inertial navigation system and Doppler navigation ,with its ability of accurate navigation and positioning when it is applied to the navigation system of autonomous underwater vehicle.

全球卫星定位系统应用于远程自主水下航行器导航系统中，可利用其精密导航和定位能力对航位推算导航系统如惯导和多普勒导航的累积误差进行精密校正。

Currently there are two kinds of radio navigation resources in our country. One is the Changhe Ⅱ loran, which mainly overlays inshore regions of our country and serves for ships. The advantages of this system include the strong transmitting power, the wide overlaying region, and simple receiving technique.

我国目前现有的无线电导航资源有两种：一个是"长河二号"无线电远程导航系统，主要覆盖我国近海区域，主要为舰船提供导航，该系统发射功率大，覆盖广，接收技术简单，其缺点是导航精度低，在两个台链的结合部会出现盲区。

According to three compared experiments, which are using simple tactile guide, with visual guide and with tactile board, we conclude that the simulated phosphene positioning system with tactile board is accurate (the mean error is less than 10mm) and reproducible (the standard deviation is less than 6mm) in evaluating simulated phosphene.

如此循环往复，在经过简单触觉导航、加入视觉导航和具有触摸板导航的三个对照性实验后，我们得出具有触摸板导航的模拟光幻视定位系统能够精确(平均误差小于10mm)且稳定(标准差小于6mm)的对模拟光幻视点进行定位。

Aircraft navigation system, one or more ground navigation station with the provisions of the frequency of launching radio beacon signals (such as wave, audio wave modulation or code), aircraft flight navigation equipment according to the received beacon signal measured or calculated aircraft Solutions relative to the navigation ...

飞机导航系统中，一个或几个地面导航台用规定的频率发射无线电信标信号（等幅波、音频调制波或代码），飞机机上导航设备根据收到的信标信号测出或解算出飞机相对于导航。。。

Aircraft navigation system, one or more ground navigation station with the provisions of the frequency of launching radio beacon signal (amplitude wave, audio wave modulation or code), aircraft flight navigation equipment according to the received beacon signal measured or calculated aircraft Solutions relative to the navigation ...

飞机导航系统中，一个或几个地面导航台用规定的频率发射无线电信标信号（等幅波、音频调制波或代码），飞机机上导航设备根据收到的信标信号测出或解算出飞机相对于导航。。。

The experiment was divided into two parts: linear guidance and waypoint guidance by satellite. In order to get a better result for linear guidance, the four parameters "rud","ctr","yau", and "trn" of the Pilot model for Autopilot were properly selected. Here, the GPS receiver was used only for collection of satellite signals and storage of data.

实验分为自线导航与卫星导航两部分：在直线导航中，修改自动导航器Pilot模式下的rud、ctr、yau和trn四个参数，藉以找出直线行进时较理想的状况，此时的GPS接收机仅做为接收卫星讯号并记录之用。

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。

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。

This brought fixed cost, but it also is meant at the same time use a source to won't make you singlehanded assume a problem.

这带来了一定的成本，但它同时也意味着使用开源不会让你独力承担问题。

He gained a small fortune in real estate.

他在房地产上发了一笔小财。