CAJ | 학술논문

为了提高“嫦娥3号”探测器(着陆器和巡视器)的相对定位精度,针对两器信标实际设置情况,设计了同波束干涉测量(same-beam interferometry,SBI)观测方案。利用着陆器和巡视器星地对接数据分析检验了由差分群时延解算含微小系统差的差分相时延的方法,给出了甚长基线干涉测量(very long baseline interferometry, VLBI )和同波束干涉测量模型及月面定位方法,并仿真分析了巡视器的相对定位精度。最终,把研究的方法实际应用于“嫦娥3号”巡视器的精密相对定位。结果表明,利用1 h 左右的连续观测弧段的着陆器数传信号以及巡视器数传信号(或遥测信号),采用事后处理方式,得到了随机误差约1 ps 的差分相时延数据。利用此数据,把“嫦娥3号”探测器的相对定位精度提高至1 m 左右。
위료제고“항아3호”탐측기(착륙기화순시기)적상대정위정도,침대량기신표실제설치정황,설계료동파속간섭측량(same-beam interferometry,SBI)관측방안。이용착륙기화순시기성지대접수거분석검험료유차분군시연해산함미소계통차적차분상시연적방법,급출료심장기선간섭측량(very long baseline interferometry, VLBI )화동파속간섭측량모형급월면정위방법,병방진분석료순시기적상대정위정도。최종,파연구적방법실제응용우“항아3호”순시기적정밀상대정위。결과표명,이용1 h 좌우적련속관측호단적착륙기수전신호이급순시기수전신호(혹요측신호),채용사후처리방식,득도료수궤오차약1 ps 적차분상시연수거。이용차수거,파“항아3호”탐측기적상대정위정도제고지1 m 좌우。
In order to improve the accuracy of relative position determination of a lunar explorer (lunar lander and rover),we designed the same-beam interferometry method according to the actual signals of the lander and the rover of CE-3.We analyzed the method for calibrating device internal delay using the strong radio source,gave the method for calculating the differential phase delay from group delay,and analyzed the accuracy of relative position determination by simulation.Finally,we used the same-beam interferometry to observe the rover and the lander of CE-3.As the results,using the lander’s data-transmission signal and the rover data-transmission or telemetry signal,the differential phase delay data were obtained with a 1ps random error,and the accuracy of rover relative position was improved to about 1 m.