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俄罗斯航天局正在规划和推进新的月球探测计划,包括月球-资源和月球-全球探测任务,它们搭载了3个无线电科学载荷:2个无线电信标机分别安装在2个着陆器上,1个Ka波段接收机安装在月球-全球轨道器上。信标机发射频率为8.4GHz和32GHz。8.4GHz的微波信号将被发回地球,利用地面VLBI监测网对信号进行测量,其结果可用于精密的天体力学观测及导航,还能用于月球天平动研究;32GHz信号将用于定轨和月球重力场研究。Ka波段信号天线轴指向着陆区天顶方向,信号由轨道器接收。本文基于对Ka波段信号多普勒频移的精确测量,通过研究着陆区附近重力场的微小变化(约3~5mGal精度),探讨月球重力场的不均匀性,其测量数据的空间分辨率约为20km。
The Russian Space Agency is planning and promoting new lunar exploration programs, including the Moon-Resource and Moon-Global Exploration mission, which carry three radio scientific payloads: two radio beacons mounted on two landers, one on each Ka-band receiver installed on the moon - the world’s orbiter. Beacon machines transmit at 8.4GHz and 32GHz. 8.4GHz microwave signal will be sent back to the earth, the use of terrestrial VLBI monitoring network to measure the signal, the results can be used for precise celestial mechanics and navigation, but also for the lunar movement study; 32GHz signal will be used for orbit and Lunar gravity field research Ka-band signal The antenna axis points to the zenith of the landing zone and the signal is received by the orbiter. Based on the accurate measurement of the Doppler frequency shift of the Ka-band signal, this paper investigates the inhomogeneity of the lunar gravity field by studying the small change of the gravitational field in the vicinity of the landing area (about 3 ~ 5mGal accuracy), and the spatial resolution of the measured data is about For 20km.