| 查看: 447 | 回复: 3 | |||
| 本帖产生 1 个 翻译EPI ,点击这里进行查看 | |||
linbocn铁杆木虫 (著名写手)
|
[求助]
求翻译,谢谢
|
||
| The instantaneous Earth rotation rate, usually expressed as variation of the length of day (LOD ) and the orientation of the rotational axis of the Earth in space are the quantities which link the terrestrial (ITRF) and the celestial (ICRF) reference frames. Currently a set of very distant quasars, forming an external set of stable reference markers, provide the only way of determining the rotational velocity and the variations of the orientation of the rotational axis of the Earth with sufficient accuracy for precise point positioning and navigation on the Earth’s surface. Typical values of less than 10 s for the measurement of LOD and 0.5 nrad (0.1 mas) for the pole position are routinely achieved by a network of radio telescopes and satellite observations , by the services of the International Association of Geodesy (IAG). The operation of such a network requires extremely expensive equipment and a massive maintenance effort. Huge amounts of data are recorded in each measurement session, which require physical transport over large dis-tances for the correlation process in the analysis centers. Because of issues such as data latency and the fact that there is no continuous measurement coverage, it is highly desir-able to investigate complementary methods for the precise estimation of Earth rotation. Furthermore, the development of independent measurement techniques will allow for the identification of intratechnique biases if they exist. |
» 本帖已获得的红花(最新10朵)
» 猜你喜欢
投稿精细化工
已经有6人回复
博士读完未来一定会好吗
已经有36人回复
之前让一硕士生水了7个发明专利,现在这7个获批发明专利的维护费可从哪儿支出哈?
已经有10人回复
导师想让我从独立一作变成了共一第一
已经有10人回复
博士申请都是内定的吗?
已经有9人回复
心脉受损
已经有8人回复
读博
已经有5人回复
sadmissyou
金虫 (小有名气)
- 翻译EPI: 27
- 应助: 0 (幼儿园)
- 金币: 1236.3
- 红花: 1
- 帖子: 165
- 在线: 105.2小时
- 虫号: 1461053
- 注册: 2011-10-26
- 性别: GG
- 专业: 环境工程
【答案】应助回帖
★
爱与雨下(金币+1): 2011-11-08 21:18:09
linbocn(金币+70, 翻译EPI+1): 谢谢 2011-11-09 18:51:24
爱与雨下(金币+1): 2011-11-08 21:18:09
linbocn(金币+70, 翻译EPI+1): 谢谢 2011-11-09 18:51:24
|
地球顺势自转速率,一般以一天的长度(LOD)和地球旋转轴在太空中的方向来表示,是联系陆地(国际地球参考框架)以及天体(国际天球参考架)参考帧的数量。当前有一组类星体(恒星?不确定)形成了一套稳定的外部参考标记,并提供了唯一足够精确的的方式为在地球表面精密单点定位和导航指明地球自转速度及自转轴方向变化。典型数据,天长(LOD)测量少于10秒(s)及杆位(pole position)测量少于0.5 nrad(0.1mas。。单位不知道。。), 可以通过射电望远镜和卫星观测网络来实现,由国际大地测量协会(IAG)提供服务。这样一个网络的运行需要非常昂贵的设备和大量的维护工作。每个测量活路中的大量数据都被记录,这就要求为分析中心的相关性处理提供长距离物理传输。由于数据延迟,没有连续测量范围等问题的存在,审查辅助方法精确估计地球自转是非常值得的。此外,独立测量技术的发展将顾及到技术偏差的识别,如果存在的话。 仅供参考。。。隔行如隔山啊。。。 |
2楼2011-11-08 21:05:30
linbocn
铁杆木虫 (著名写手)
- 翻译EPI: 1
- 应助: 1 (幼儿园)
- 金币: 11081.9
- 散金: 30
- 红花: 13
- 帖子: 1229
- 在线: 431.8小时
- 虫号: 1011624
- 注册: 2010-05-05
- 性别: GG
- 专业: 光学
3楼2011-11-09 00:20:16
![]() |
4楼2011-11-09 11:49:04













回复此楼
linbocn
