3-way doppler in Chang'e mission

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Information about 3-way doppler in Chang'e mission
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Published on September 18, 2008

Author: jnnccc

Source: authorstream.com

深空探测器的开环多普勒测量 : 深空探测器的开环多普勒测量 原理、实现及在嫦娥卫星测量中的初步结果 中国科学院上海天文台 平劲松 简念川 鄢建国 张素君 尚昆 jnnccc@shao.ac.cn 简介 : 简介 深空探测中的开环测量技术分为差分测距和测速以及相应的差分测速。相对于闭环测量,开环测量可以省却发射上行信号(或者说上行发射和下行接收是分离的——对应于多程的情形),这种测量模式在实际的测量任务中可以省去许多资源的消耗,但开环的测量对于信源的稳定性要求较高,就目前对嫦娥单程和三程的测量结果来看,频率随机误差分别为1Hz 和20mHz,对应的速度随机差为7cm/s和1.4mm/s,单程测量结果不能满足定轨要求。本文将给出嫦娥三程多普勒测量结果和定轨结果以及对欧空局环火星的MARS-express的单程基带频率测量结果(由于无相应的信标,无法给出视向速度) Slide 3: 多普勒测量需要精确计算天线接收到的载波频率值。处理流程如下 基本原理 对嫦娥卫星的三程多普勒测量和定轨结果 : 对嫦娥卫星的三程多普勒测量和定轨结果 测量、记录以及数据处理描述 天线接收卫星转发喀什站的S波段上行信号,记录终端对2MHz带宽的基带信号以4MHz采样率8比特量化模式记录,载波频率大约在基带500KHz处。对记录的数据采用多级滤波降采样,最终将信号降到500Hz,采样率降为4KHz。对得到的信号进行多项式相位拟合即可计算出多普勒偏移,这里得到的瞬时相位也可以用作其它的用途:如差分测距和视向加速度的直接测量 对嫦娥卫星的三程多普勒测量和定轨结果 : 对嫦娥卫星的三程多普勒测量和定轨结果 时域和频域样本分布 对嫦娥卫星的三程多普勒测量和定轨结果 : 对嫦娥卫星的三程多普勒测量和定轨结果 结合USB数据和VLBI观测数据定轨后系统差为2cm/s,随机差为0.2mm/s 残差结果(O-C):红色为USB残差,绿色为喀什-乌鲁木齐南山站的三程多普勒残差 对欧空局mars-express的单程观测结果 : 对欧空局mars-express的单程观测结果 由于没有初始轨道和信标,这里只给出基带频率演化 从拟后残差的分布来看信标瞬时稳定度约为10^-12

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