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中国计划于2019年发射10颗北斗卫星

  本周二,中国航天科技集团公司(CASC)宣布,今年中国将通过7次发射,发射10颗卫星加入北斗导航卫星系统(BDS)。
  中国航天科技中心空间司司长尚志在发布《中国航天科技活动蓝皮书》的新闻发布会上表示,此次发射将有助于2020年前完成北斗系统全球网络建设。
  蓝皮书称,2018年共发射北斗卫星18颗,标志着北斗3号系统初步建成。导航系统已经开始提供全球服务。
  北斗系统作为改革开放40年来的一项重要成果,也广泛应用于为中国经济发展服务。
  蓝皮书称,在浙江省东部,6000多艘渔船安装了北斗系统船舶运动监测系统,这有助于提高定位精度和快速性。
  目前,北斗系统已在全国36个主要城市安装或兼容617万辆汽车、3.5万辆邮递和快递车辆、8万辆公交车。该系统也用于国产民用飞机。
  中国邮政已为邮政车辆配备3万个北斗系统终端机,并接入北斗系统信息管理平台。蓝皮书显示,电商巨头京东还为1500辆物流车辆和2000名快递员配备了智能BDS终端。
  北斗系统也被广泛用于服务国家的农业生产。农用车自动驾驶系统已在全国范围内大规模应用,基于导航系统的农机监控平台已服务农机设施5万余台。
  20世纪90年代,中国开始建设以北斗七星命名的导航系统,并于2012年开始服务于亚太地区。
  截至2018年底,在轨运行的北斗卫星33颗,其中北斗二号卫星15颗,北斗三号卫星18颗。
  与北斗二号系统相比,北斗三号系统的技术有了很大的改进。卫星之间的通信、数据传输和测距可以通过卫星间的链路来实现。
  系统的信号和定位精度也有了显著提高。北斗三号卫星采用中国自主研制的高精度铷原子钟和氢原子原子钟。
  该系统全球定位精度已达到10米,亚太地区定位精度达到5米。它的速度精度为0.2米/秒,计时精度为20纳秒。

英文版(原文)
China to launch 10 BeiDou satellites in 2019

China will send 10 satellites to join the BeiDou Navigation Satellite System (BDS) through seven separate launches this year, the China Aerospace Science and Technology Corporation (CASC) announced Tuesday.
The launches will help complete the BDS global network by 2020, said Shang Zhi, director of the Space Department of the CASC, at a press conference, where the Blue Book of China Aerospace Science and Technology Activities was released.
According to the blue book, a total of 18 BeiDou satellites were launched in 2018, marking the completion of the BDS-3 primary system. The navigation system has started to provide global service.
As an important achievement during the past 40 years of reform and opening-up, the BDS has also been widely used to serve China's economic development.
More than 6,000 fishing boats in the eastern province of Zhejiang have been installed with the BDS ship movement monitoring system, which helps them improve positioning accuracy and promptness, according to the blue book.
About 6.17 million vehicles, 35,000 postal and express delivery vehicles and 80,000 buses in 36 major cities have been installed or are compatible with the BDS. The system is also used in homemade civilian aircraft, it says.
China Post has equipped its postal vehicles with 30,000 BDS terminals and connected them with the BDS-based information management platform. E-commerce giant JD.com also arms 1,500 logistics vehicles and 2,000 couriers with smart BDS terminals, according to the blue book.
The BDS is also widely used to serve the country's agricultural production. An automatic driving system for agricultural vehicles has been put into large-scale application across the country, while the farming supervision platform based on the navigation system has served more than 50,000 farm machines and facilities.
China began to construct its navigation system, named after the Chinese term for the Big Dipper constellation, in the 1990s and started serving the Asia-Pacific region in 2012.
By the end of 2018, there were a total of 33 BDS satellites operating in orbit, including 15 BDS-2 satellites and 18 BDS-3 satellites.
Compared with the BDS-2 system, the technologies of the BDS-3 system have been greatly improved. The communications, data transmission, and ranging among satellites can be achieved through inter-satellite links.
The system's signals and positioning accuracy have also significantly improved. The BDS-3 satellites are equipped with high-precision rubidium and hydrogen atomic clocks independently developed by China.
The positioning accuracy of the system has reached 10 meters globally and five meters in the Asia-Pacific region. Its velocity accuracy is 0.2 meters per second, while its timing accuracy stands at 20 nanoseconds.

关键词:北斗卫星