In this paper , detecting and surveillance process of ballistic missile with low satellite of sbirs is studied deeply 本文以天基红外系统中的低轨道卫星为观测平台,针对低轨预警卫星对弹道导弹的跟踪及弹道估计算法展开深入研究。
Both clocks aim to measure with 99 . 99997 percent accuracy how much the microgravity of low - earth orbit slows time compared with measurements made on the ground 这两座钟的目标都是要以99 . 99997 %的精确度，去测量低轨道所受的微重力（较之于地球表面）会使时间变慢多少。
This paper mainly focuses on the front - end of the leo satellite system based on cdma , presents the system architecture , the algorithms employed hi the system and the implementation 本文研究了整个低轨道卫星cdma传输系统的数字前端，介绍了其结构、算法原理及具体实现。
The pentagon ' s defense threat reduction agency ( dtra ) attempted to predict the results of various hypothetical scenarios involving the use of hanes against leo satellites in 2001 美国五角大厦的防恐怖威胁署（ dtra ）于2001年尝试预测高空核爆影响低轨道卫星所造成的各种假设状况，结果相当令人震惊。
For example , it can be used to drag make - up and solar pressure cancellation of low orbit spacecraft , formation flying and precise positioning of small satellite , repos 同时， mpt也可用于低轨道( 300 500km )航天器的大气阻力补偿，星际航行航天器的主推进，以及星座和小型卫星的编队飞行和精确定位等，具有广阔的应用前景。
After joining the cospas - sarsat in 1992 , china established the chinese mission control center , thus greatly improving the capability of the emergency alarm service for ships , aircraft and vehicles 中国在1992年加入了国际低轨道搜索和营救卫星组织，以后还建立了中国任务控制中心，大大提高了船舶、飞机和车辆遇险报警服务能力。
The space station system inosculates the technology of satellite and manned flight vehicle . it can realize manned flight in the low orbit with more reliability , maintainability , expandability and usability 空间站系统融合了卫星和载人飞船的技术，可以长期在空间低轨道上作载人飞行，而且具有较高的可靠性、维修性、可扩展性和实用价值。
Radio tracking of the trajectory of lunar prospector , which traveled in a low orbit that came as close as seven kilometers to the lunar surface , showed stronger than expected gravity above some of the youngest impact basins 月球探勘者号以靠近月表七公里的距离沿低轨道运行，无线电追踪月球探勘者号的轨迹显示，部份最年轻的撞击盆地上，其重力高于预期。
Caption : : the low - orbit design allows astronauts to conduct servicing missions and upgrade scientific instruments . it brought enormous remarkable astronomical discoveries . public outcry of saving hubble turns out extended hst ' s life 低轨道设计让望远镜可以定期由太空人进行维修和升级科学仪器。哈勃为天文界带来前所未有的贡献，在天文学家的争取下，哈勃的寿命得以延长。
The tdrss ( tracking and data relay satellite system ) is a system which can supply the data relay and tt & c ( telemetry tracking and command ) service for the aircraft which are low and middle earth orbit and other aircrafts , aircraft and earth station 跟踪与数据中继卫星系统tdrss ( trackinganddatarelaysatellitesystem )是为中、低轨道的航天器与航天器之间、航天器与地面站之间提供数据中继、连续跟踪与轨道测控服务的系统。
