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The author:(作者)hpmailerpublished in(发表于) 2013/12/1 20:43:10 Chang， third aimed at “zero-window“ launch
CNS, Xichang, November 30 (reporter Zhang Ziyang)-China Tower ", third" lunar probe will be launched on December 2. Why choose the launch window, the Xichang satellite launch Center, an expert on 30th told news agency reporters, "external conditions affecting the launch window the main celestial bodies required to run the track conditions, the orbit of a spacecraft, spacecraft operating conditions require, others such as the direction of launch, the ground track measurement and meteorological conditions. ”
"The time frame for launch window is allowed to launch spacecraft, the mission seeks to rocket fire is just in time. "The experts said.
As far as I know, Yu Change the third probe will be sent directly to near about 200 km, an apogee of about 380,000 km from earth-moon transfer orbit, He Change compared to the first, the second satellite launch, demand more of rocket thrust. Thus, the launch of bundled with four booster implemented long third b rocket launches. To increase the precision of probe to orbit, the mission will continue to aim at "zero-window" launch.
It is understood that Chang after the third probe, delivered to the launch site, requires acceptance from researchers of the various systems of strict "physical examination" to complete all preparations prior to flying.
Xichang satellite launches Center in Success launches Chang first,, and second, satellite Hou, for Chang third, task features, from improve participants equipment security, and reliability start, has pointed to carried out has the technology prepared and post training, measuring made, and measurement and control, and communications, and meteorological, and service guarantees, system on related equipment facilities for has mass upgrade transformation, including update measurement equipment, and update telemetry system, and transformation optical instrument, and construction ground meteorological automatically observation system,, further improve has launch site of reliability and overall launches capacity.
For Xichang area altitude wind and cold wave cooling, effects launches of important weather factors, Center organization expert and post personnel on more than 40 years of climate information for analysis than on, on 8,000 m to 12,000 m of altitude wind for precise forecast, construction ground meteorological automatically observation system, implementation field fine of forecast, put numerical forecast from 5 km range shortened to 3 km, temperatures forecast errors not over 1 degrees, great improve has forecast fine of degree, for detector created best of Ben months conditions, and best of fell months track. (End text)
(Original title: Chang-third, aimed at "zero-window" launch experts decrypted launch environment)
中新网西昌11月30日电 (记者 张子扬)中国“嫦娥三号”月球探测器将于12月2日凌晨1时30分发射。对于为何会选择这个发射窗口，西昌卫星发射中心一位专家30日告诉中新社记者，“影响发射窗口的外界条件主要有天体运行轨道条件、航天器的轨道要求、航天器的工作条件要求、其它如发射方向、地面跟踪测控和气象等条件。”
“发射窗口是允许发射航天器的时间范围，此次任务力争分秒不差地将火箭点火发射。”该专家称。
据知，由于嫦娥三号探测器将直接被发送至近地点约200公里，远地点约38万公里的地月转移轨道，和嫦娥一号、二号卫星发射相比，对火箭的推力要求更大。因此，此次发射采用捆绑有四个助推器的长征三号乙运载火箭实施发射。为提高探测器入轨精度，此次任务仍将瞄准“零窗口”发射。
据了解，嫦娥三号探测器运抵发射场区后，需要接受来自各系统科研人员的严密“体检”，完成飞天前的各项准备工作。
西昌卫星发射中心在成功发射嫦娥一号、二号卫星后，针对嫦娥三号任务特点，从提高参试设备安全性、可靠性入手，有针对性地开展了各项技术准备和岗位训练，测发、测控、通信、气象、勤务保障等系统对相关设备设施进行了大规模升级改造，包括更新测量设备、更新遥测系统、改造光学仪器、建设地面气象自动观测系统等，进一步提高了发射场的可靠性和整体发射能力。
针对西昌地区高空风和寒潮降温等影响发射的重要天气因素，中心组织专家和岗位人员对40多年的气候资料进行分析比对，对8000米到12000米的高空风进行精确预测，建设地面气象自动观测系统，实施场区精细化预报，把数值预报从5公里范围缩短到3公里，气温预报误差不超过1度，极大提高了预报精细化程度，为探测器创造最好的奔月条件、最佳的落月轨道。(完)
(原标题：嫦娥三号瞄准“零窗口”发射 专家解密发射环境)
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