嫦娥一号卫星撞月时刻与坐标精确分析  

Accurate Determination of Impact Epoch and Coordinate of Chang'E-1 Satellite on the Moon

作　　者：马茂莉[1] 郑为民[1] 李金岭[1] 王广利[1] 

机构地区：[1]中国科学院上海天文台,上海200030

出　　处：《宇航学报》2011年第3期477-481,共5页Journal of Astronautics

基　　金：国家自然科学基金项目(10878021;10973030);国家863重大项目课题(2008AA12A209);上海市自然科学基金项目(09ZR1437300);上海市科学技术委员会资助项目(06DZ22101)

摘　　要：针对CE-1卫星精确的撞月时刻与撞月点坐标,首先通过探测器载波信号的本地相关处理技术,精确分析了载波信号在VLBI各测站的消失时刻,进而推算了卫星的撞月时刻;通过实时单向多普勒频移测量的事后分析,核实了卫星撞月过程中的飞行姿态演化;最后结合VLBI互相关时延与测距资料,经定位归算确定撞月点坐标。分析表明,CE-1卫星撞月时刻的误差为±5μs,撞月点坐标月面切向和三维定位误差分别约为0.274km和0.319km(1σ)。The impact epoch and coordinates of the Chang＇e-1 satellite on the moon are obtained through several techniques.The local correlation technique is used to determine the time when the carrier signals disappeared at VLBI stations,and the impact epoch on the moon.Real-time doppler data is analyzed to examine the flight attitude evolution of the satellite during the landing arc section.Position reduction for the VLBI delay and the USB ranging data is used to determine the impact coordinates.The uncertainty of the impact epoch is ±5μs,and the lunar tangential linear and three dimensional coordinate accuracy are about 0.274km and 0.319km（1σ） respectively.

关 键 词：嫦娥一号卫星 撞月时刻与坐标 本地相关测量 VLBI 多普勒频移测量 月球探测 

分 类 号：P184[天文地球—天文学]