论文部分内容阅读
X频段是深空测控的主用频段,其多普勒测速精度远高于S频段,这一结论在“嫦娥二号”任务X频段深空测控技术试验中得到了验证,测速精度约为1mm/s。针对X频段高精度测速,本文分析了目前采用的径向速度近似计算公式,理论分析其产生的误差在地月转移和环月轨道段可达1cm/s。通过“嫦娥二号”任务X频段测控技术试验,以事后精密轨道为基准进行残差分析,结果表明,相比精确公式,近似公式计算测速数据的残差会增加1mm/s,已与X频段测速精度本身相当,因此,多普勒测速近似计算在X频段测量中已不再适用,应使用本文中列出的精确计算公式。
X-band is the main frequency band for deep space monitoring and control, and its Doppler velocimetry accuracy is much higher than the S-band. This conclusion has been verified in the X-band deep space monitoring and control technology experiment of Chang’e II mission. 1mm / s. For the high-speed X-band velocimetry, this paper analyzes the approximate radial velocity formula currently used, the theoretical analysis of the error generated in the ground-moon transfer and lunar orbit section up to 1cm / s. Through the “Chang’e II” mission X-band measurement and control technology experiment, the residual precision analysis based on the precision orbit is taken. The results show that the residual error of the approximate formula to calculate the velocity data will increase by 1mm / s compared with the exact formula. The accuracy of the X-band velocimetry is comparable, so the approximate Doppler velocimetry calculation is no longer applicable in the X-band measurements and the exact formulas listed in this article should be used.