In the satellite navigation and positioning system, Doppler shift is one of the key problems that may degrade the performance of the satellite receiver.
在卫星导航定位系统中，多普勒频率偏移是影响接收机性能的关键因素之一。
The determination method of sea surface topography is important for sea users to improve the positioning accuracy with the double satellite navigation and positioning system.
海面地形的确定方法研究对提高双星导航定位系统海面用户定位精度具有重要意义。
So, it is very important for us to do some research on the satellite navigation and positioning system antenna especially on the broadbandization and miniaturization technology.
而研究卫星定位系统终端使用的天线具有重要的价值与意义，特别是天线的宽带化、小型化技术。
The road-mobile variant might have a lower accuracy but this can be improved by adding satellite navigation and positioning capability such as GPS or GLONASS to the launch platform.
公路-机动型可能精度较低，但是能通过增加卫星导航和部署能力来改进，像通过美国的全球定位系统（GPS）或俄罗斯的全球轨道导航卫星系统（GLONASS）部署到发射平台。
Beijing Synjunction Technology co., Ltd is a private hi-tech company, specializing in satellite communications and satellite navigation and positioning system and its products development.
北京星桥通科技有限公司是专业从事卫星通信和卫星导航定位技术与产品开发的民营高新技术企业。
Satellite applications, including earth observation, communications and broadcasting, navigation and positioning.
对地观测、通信广播、导航定位等卫星应用。
Global Positioning System(GPS)is a satellite navigation system designed to provide instantaneous three-dimensional position infbrmation almost anywhere on the globe at any time, and in any weather .
GPS全球定位系统以其全球性、全天候、实时定位等优点显示出强大的生命力和竞争力，在航空、航天、航海及许多民用领域有着广泛的应用。
The paper introduces the Germanic satellite positioning and navigation service. According to its precision, respond time, its purpose, it was divided into four-level service.
本文介绍德国的卫星定位与导航服务，及其按精度、时间响应和目的所分成的四个级别的服务。
Satellite positioning navigation means using the position, velocity and time information supplied by the satellite positioning navigation system to localize, navigate and manage the target.
卫星定位导航是指利用卫星定位导航系统提供的位置、速度及时间信息对各种目标进行定位、导航及监管。
GPS satellite position calculation is the key link of GPS navigation and positioning, calculating satellite coordinates quickly and accurately is important to improve positioning speed and precision.
GPS卫星位置计算是进行GPS导航定位的关键环节，快速准确地计算出卫星坐标，对提高GPS定位精度和速度有着重要意义。
The positioning accuracy and availability of navigation system are affected directly by the quality of satellite configuration.
在导航系统中，基准站配置的优劣直接关系到定位的精度及系统的可用性。
They use a combination of inertial, satellite, and stellar for accurate navigation and positioning.
它们使用组合惯性，卫星和星形用于精确导航和定位。
GPS-101 simulation of a global positioning satellite and the production of a specific satellite carrier (SV) and navigation data model to perform this test.
GPS- 101模拟一个全球定位卫星并生产一个特定卫星载体(SV)和导航数据模型来完成这项测试。
Shandong CompStar Navigation Technology Co., Ltd is mainly engaged in application of high accuracy satellite positioning equipment and systems development and production.
山东北斗华宸导航技术有限公司主要从事卫星定位设备及集成应用系统开发、研制和生产。
At last, it takes over the challenges and counter-measures of the navigation and positioning satellite technology under the background of the navigation warfare.
最后，对导航战背景下的卫星导航定位技术所面临的挑战和应对措施进行了讨论。
It can provide some reference worth to expand the application field of Software Radio and study the framework of the satellite positioning and navigation receive system.
所做工作对开拓软件无线电的应用领域和卫星定位导航系统接收机结构的研究有一定的应用价值。
The Time Standaards of navigation positioning system and Time Service of Timing by Satellite and Satellite Timing Calibration of Timing are introduced.
介绍了导航定位系统的时间基准及实现时间统一的卫星授时技术和定时技术。
GPS can not be used continuously for city vehicle navigation due to the loss of satellite signals by obstructions from buildings, tunnels and trees etc and it leads to low positioning accuracy.
对于城市车辆GPS导航来说，其很大的一个缺点是跟踪卫星的信号常常由于建筑物、隧道及树木等的遮挡而使GPS的定位精度大大降低，甚至无法进行正常的导航和定位。
Assisted satellite positioning technology is drawing more and more attention currently due to its navigation accuracy, availability and integrity.
卫星辅助定位技术在定位的精度、可用性和连续性上受到人们的普遍关注。
It can provide some reference worth to expand the application field of Software Radio and study the framework of the Satellite Positioning and Navigation receiver system.
这对开拓软件无线电的应用领域和卫星定位导航系统接收机结构的研究有一定的参考价值。
The Global Positioning System (GPS) of U. S is a satellite navigation and position system that now has the best performance , the highest precision of position and it is widely applied in everywhere.
美国全球定位系统GPS是目前性能最完善、定位精度最高、应用最广泛的卫星导航定位系统。
The study of this paper indicate that the application of digital IF Software Radio framework is practicable in the receiver of the Satellite Positioning and Navigation system.
本文研究表明在卫星定位导航系统中使用中频数字化的软件无线电结构是可行的，同时大大简化了用硬件对接收的卫星信号进行处理时电路的复杂性。
This paper introduces the short message communication technology of the Beidou satellite navigation guiding and positioning system.
介绍了北斗卫星导航定位系统的简短通信技术。
Satellite applications, including earth observation, communications and broadcasting, navigation and positioning.
——对地观测、通信广播、导航定位等卫星应用。
In the proposed schemes, the redundant configuration of grandmaster clock using Beidou navigation satellite system, GPS (Global Positioning system) and atomic clock is discussed.
在应用方案中，讨论了利用北斗卫星定位系统、全球卫星定位系统(GPS)和原子时钟构建最高级时钟的冗余配置方案。
In the proposed schemes, the redundant configuration of grandmaster clock using Beidou navigation satellite system, GPS (Global Positioning system) and atomic clock is discussed.
在应用方案中，讨论了利用北斗卫星定位系统、全球卫星定位系统(GPS)和原子时钟构建最高级时钟的冗余配置方案。
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