神舟十二徑向交會試驗

第一步是进行绕飞。航天科技集团五院神舟十二号载人飞船飞控技术组组长杨海峰杰介绍，神舟十二号与核心舱分离之后会撤到核心舱前向大约2公里左右，然后从上方绕到核心舱的后下方大约2.5公里处时，绕飞完成。

接下来开始进入“径向交会”模式。在进行“径向交会”试验之前，神舟十二号首先要进行姿态调整，即从水平方向调整到垂直方向。在姿态调整的过程中，神舟十二号逐步靠近核心舱径向对接口，到距离大约200米的位置，飞船完成姿态调整，处于和核心舱垂直的方向。

“这时飞船的对接机构和‘天和’的被动对接机构就对准了。然后再发指令继续前进。”杨海峰说，按照设计，飞船继续前进至离核心舱大约20米的位置，保持5分钟左右。

在完成“径向交会”试验之后，神舟十二号将撤离到距离核心舱下方200米的位置，之后将再次绕飞到核心舱前向。

至于为何要掌握径向交会对接任务，北京航天飞行控制中心空间站任务总师孙军在受访时表示，这主要因为神舟飞船为航天员访问空间站而设计的，因为今后将进行航天员乘组的轮换，同时有两艘飞船对接空间站，这就意味着将要使用径向对接的方式才能提供航天员进驻空间站的通道和手段。神舟飞船的发动机、控制系统和敏感器是专门为全方位与空间站对接而设计的。

DART rendezvous

留言

這個網誌中的熱門文章

CMOS sensor trends and astrophotography, from amateur astronomers perspective

Nowadays, even in low light conditions, digital camera can quality pictures with higher ISO, noise and hot pixels have been gradually reduced. Sony has introduced back illumination process for consumer market. Sony BSI sensors evolved from Exmor to now Exmor RS( stacked) technology. This stacked technology allows further chip size reduction, which has strong demands in smartphone camera market. Digital astrophotography is also benefited from such advances, utilising Back Side Illumination technology Exmor: Within the CMOS sensor, it outputs low-noise digital signals by "on-chip column AD conversion" and "dual noise reduction" to suppress noise in the first half of the process In low light conditions, when a wide aperture is desirable to collect as much light as possible. At apertures wider than f/2.0, back-illuminated Exmor R sensors are significantly more efficient at collecting light than conventional, front-illuminated sensor...

閱讀完整內容

ultrafast rendezvous to ISS

14 Oct 2020, being the first to use a new “ultrafast” rendezvous” scheme with the ISS. Following a flawless ascent to the correct orbit, Soyuz 2 .1a , Soyuz MS-17 caught up with the orbiting laboratory in only two orbits (three hours), halving the time it takes for crew to get to the Station. The three space travelers of the Soyuz MS-17 mission launched on a six-month mission the International Space Station. previous 3/4 orbit rendezvous: Soyuz MS-16 4 orbit rendezvous A three-orbit profile was deemed possible without major flight design changes after inauguration of the Soyuz 2-1A rocket that provides a much higher orbit injection accuracy than its predecessors and would allow the two correction maneuvers on Orbit #2 to be eliminated while the Automated Rendezvous Phase would still remain untouched. The deletion of the Orbit #2 maneuvers was expected to slightly tighten the already restrictive phase angle window from and upper limit of 30-35° to 25-28°...

閱讀完整內容

Scythians 斯泰基塞種西古提人

900 BC - 200 AD British museum Tomb of scythe prince, Buktarma valley, 1200 masl, Google map Herodotus 絲路上的帝國 Biblegeography 哥羅西書 3：11 在此並不分希利尼人、猶太人、受割禮的、未受割禮的、化外人、西古提人、為奴的、自主的．惟有基督是包括一切、又住在各人之內。塞種塞迦 saka 史記漢書西域傳：塞種 ctext 昔匈奴破大月氏，大月氏西君大夏，而塞王南君罽賓。塞種分散，往往為數國。自疏勒以西北，休循、捐毒之屬，皆故塞種也。匈奴列傳 Ctext ：塞王《史記》在《大宛列傳》與《匈奴列傳》中，詳細記錄了中亞至天山一帶的塞種（塞王、塞地）狀況。例如，文中記載了月氏西破走塞王，導致塞人南遷越過懸度（今帕米爾高原及克什米爾一帶） Baike Genetic history Genetics Nih griffin ? Scytho-Siberian world 塞迦 saka wiki Disappeared? Sarmatians （薩爾馬泰，奄蔡史記 , Aorsi ）and goths YouTube

閱讀完整內容

Hello!! It's Joseph

搜尋此網誌