深空网干涉测量技术在“嫦娥3号”任务中应用分析

Analysison Interferometric Tracking Technology by ChinaDeep Space Network in the Chang’e-3 Mission

摘要: 针对中国深空网DOR/ΔDOR测量技术在“嫦娥3号”测控任务中的首次应用情况,论述了深空网干涉测量系统采用的稀疏交替射电源标校技术。在地月转移、环月段开展了多次观测,所获得的时延、时延率观测量结果直接应用于“嫦娥3号”的轨道确定。通过与事后精密轨道比对分析,深空网干涉测量技术的时延观测量精度优于1ns,对应于约90nrad的角位置精度;时延率精度优于1ps/s,相当于亚mm/s量级测速(差)精度,中国深空网干涉测量技术有力支撑了“嫦娥3号”的测定轨任务。

Abstract: Based on the first implementation of interferometric tracking technology in the Chang’e-3 projectby China DSN (DeepSpaceNetwork),this paper describes the differential interferometric tracking technique with the sparse quasar calibration.And the tracking data during Chang’e-3’s cruise to the moon is analyzed as well. Compared with high accuracy orbit ephemeris,time delay observation error is less than 1ns which corresponds to anangular accuracy of about 90nrad.And delay rate error is below 1ps/s.Interferometric tracking has played an important role in Chang’e-3 project.