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The character of LEO-LEO satellite occultation events is well discussed in this paper. The impact of satellite orbit parameters on the number and distribution of occultation events are discussed based on simulation.

文章对LEO-LEO卫星掩星事件的特性进行了深入讨论，通过仿真计算定量讨论了轨道参数对掩星事件次数及分布的影响。

In this paper,we analyze the key techniques for the service precision of Global Navigation Satellite System such as time reference,time synchronization,satellite orbit determination,etc.

对影响导航定位系统定位精度的各种因素进行了分析。研究了影响导航定位精度的关键技术问题，如时间基准、时间同步和卫星定轨等。

To take full advantage of all aspects of strength, and continuously improve the capability of independent innovation of Surveying and Mapping Technology to enhance the information infrastructure of self-protection mapping capabilities, a comprehensive benchmark system to promote infrastructure mapping, high-resolution three-dimensional mapping and surveying and mapping satellite system satellite applications, and enhance GIS Rapid access and update capability, enrich and perfect the digital mapping technology and equipment to promote the surveying and mapping technology and the optimization and upgrading of management tools to improve the geographic information collection, processing and the overall strength of the provision of services.

要充分利用各方面力量，不断提高测绘科技自主创新能力，提升信息化测绘基础设施自主保障能力，全面推进测绘基准体系基础设施、高分辨率立体测图卫星以及测绘卫星应用系统建设，增强地理信息的快速获取和更新能力，充实完善数字化测绘技术装备，促进测绘生产技术及管理手段的优化升级，提高地理信息采集、处理和提供服务的整体实力。

It is emphasized that two fundamental condition of using this method are that the satellite＇ spin need to be basically stable and the satellite＇s perigee should be not so much high （below 1000 km）.

特别强调了需要注意的基本条件，即卫星必须自旋稳定且近地点不很高（1000km以下）。

There are many ways to calculate GPS satellite azimuth and elevation, but the precision is low. A new method to decide GPS satellite position using the broadcast ephemeris is presented, the way to checkup the precision is also given, and some research are made to analysis the error feature of the position which is calculated by the broadcast ephemeris as well, the results show the error is periodic.

GPS卫星高度角、方位角计算方法众多，但精度低；针对这点，提出了一种利用广播星历计算卫星高度角、方位角的方法，对该方法能够达到的精度提出了鉴定的途径，并分析了利用广播星历计算卫星高度角以及方位角的误差特点，结果表明利用广播星历计算的卫星高度角、方位角呈现出周期性变化的规律。

During any phases of satellite production and design, exacting design and platitudinous experiments are needed, because maintaining on the tract of satellite is not executed.

由于无法对轨道上运行的卫星进行维修，在卫星研制和制造的每个阶段，都要确保设计正确性和实验的充分性。

This research process the ionosphere-free triple-differenced carrier phase observation which consist of double frequency GPS observations from the GPS receiver carried on the CHAMP and 40 IGS tracking stations. Besides, the tropospheric correction model, solid earth tide correction, mass center correction of the satellite, earth rotation correction and antenna phase center correction are incorporated. Finally, determine the satellite short-arc orbit with the pure geometry, kinematic, method.

本研究利用CHAMP卫星上装载之GPS接收器所接收之双频观测量与地面上40个IGS追踪站组成三次差分无电离层观测量，并改正观测量中之对流层误差、固体潮误差、质量中心改正、地球自转、天线相位中心偏差等误差量，以纯几何之动态法求定低轨卫星之短弧轨道位置。

The impact of rain gauge measurements is to increase the precipitation estimated from satellite data. The main difference is in Taiwan and the southeastern China where satellite retrieval underestimates the precipitation rate during boreal spring and summer. For the different precipitation climate analyses, the Legates- Willmot rainfall climate analysis produces the largest annual mean regional rainfall.

微波放射的雨量反演比微波散射法所估计的雨量略高，增加了测站雨量计分析的综合估计，使得区域平均年降雨量比只用卫星资料的估计大，而主要的差异是源自於春、夏季以及台湾与大陆东南沿海地区，显示卫星资料低估区域的锋面降雨。

Satellite imagery is a good tool at present, this paper analysis satellite imagery and summrize feature:use a few simple sentences:aa marked decrease of deep cloudiness and rainband outside the inner core in the western quadrant,the result is an asymmetric appearance of clouds and deep convection compared to the moresymmetric structure during the mature stage of tropical cyclone.

同时对云图上的特征分析总结，分析结果表明：(1)云图上看：热带气旋变性。用几个简单的语句依次概括为：a云和深对流在东西两边的非对称性，并伴随着南边的"干缝"出现。b北边和西边"盾状"卷云的出现c台风眼墙消失产生"干缝"，冷暖锋的出现。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。