中国将于2020年完善北斗卫星导航系统_时事要闻

中国将于2020年完善北斗卫星导航系统

文章来源：未知文章作者：enread 发布时间：2016-06-16 09:18 字体： [大中小]　进入论坛

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The Chinese government on Thursday released a white paper elaborating on the action plan for the BeiDou Navigation Satellite System (BDS), which has been independently developed and operated by China.

中国政府周四就北斗卫星导航系统的详细执行方案发布一份白皮书，该系统由中国独立研发运营。

China has formulated¹ a three-step strategy for developing the BDS, according to the document released by the State Council Information Office (SCIO). The aim is to complete the deployment² of the 35 satellite constellation³ around 2020 to provide services to global users.

This is the first white paper on the navigation satellite system. It is also the 100th white paper released by the SCIO.

Initially⁴, China aimed to provide services to domestic users. The following stage featured the expansion of the network to cover the Asia-Pacific region, which was achieved by the end of 2012.

Currently, B1I and B2I open service signals are being broadcast by the operating BDS-2, providing open services to the Asia-Pacific region free of charge, according to the white paper.

The services cover an area between 55 degrees north latitude⁵ and 55 degrees south latitude, and between 55 and 180 degrees east longitude⁶, with positioning accuracy less than 10 meters, velocity⁷ measurement accuracy less than 0.2 meters per second, and timing⁸ accuracy less than 50 nanoseconds.

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收听单词发音

1 formulated
v.构想出( formulate的过去式和过去分词 )；规划；确切地阐述；用公式表示
参考例句：
He claims that the writer never consciously formulated his own theoretical position. 他声称该作家从未有意识地阐明他自己的理论见解。来自《简明英汉词典》 This idea can be formulated in two different ways. 这个意思可以有两种说法。来自《现代汉英综合大词典》

2 deployment
n. 部署,展开
参考例句：
He has inquired out the deployment of the enemy troops. 他已查出敌军的兵力部署情况。 Quality function deployment (QFD) is a widely used customer-driven quality, design and manufacturing management tool. 质量功能展开(quality function deployment,QFD)是一个广泛应用的顾客需求驱动的设计、制造和质量管理工具。

3 constellation
n.星座n.灿烂的一群
参考例句：
A constellation is a pattern of stars as seen from the earth. 一个星座只是从地球上看到的某些恒星的一种样子。 The Big Dipper is not by itself a constellation. 北斗七星本身不是一个星座。

4 initially
adv.最初，开始
参考例句：
The ban was initially opposed by the US.这一禁令首先遭到美国的反对。 Feathers initially developed from insect scales.羽毛最初由昆虫的翅瓣演化而来。

5 latitude
n.纬度，行动或言论的自由(范围)，(pl.)地区
参考例句：
The latitude of the island is 20 degrees south.该岛的纬度是南纬20度。 The two cities are at approximately the same latitude.这两个城市差不多位于同一纬度上。

6 longitude
n.经线，经度
参考例句：
The city is at longitude 21°east.这个城市位于东经21度。 He noted the latitude and longitude,then made a mark on the admiralty chart.他记下纬度和经度，然后在航海图上做了个标记。

7 velocity
n.速度，速率
参考例句：
Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。 The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。

8 timing
n.时间安排，时间选择
参考例句：
The timing of the meeting is not convenient.会议的时间安排不合适。 The timing of our statement is very opportune.我们发表声明选择的时机很恰当。

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