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2013年12月14日嫦娥三号成功软着陆,随后开展两器分离、两器互拍等任务.利用同波束VLBI(Very long baseline interferometry)技术同时观测着陆器和玉兔月球车发射的信号,解算出的二者之间的差分相时延能够反映月球车位置数厘米的微小变化.基于差分相时延监测月球车动作的高灵敏度,利用月球车移动时的差分相时延数据,求得月球车5次移动的速率,其平均值为0.056 m/s.利用差分相时延1阶多项式拟合后残差的频谱,分析了月球车移动过程中的抖动情况及与月面地形的关系.
On December 14, 2013, Chang’e III successfully landed softly, then carried out such tasks as separation of two devices, interlacing of two devices, etc. Simultaneous observation of signals transmitted by the lander and the Yutu lunar rover by VLBI (Very long baseline interferometry) The calculated differential phase delay between the two can reflect the slight change of the lunar rover position centimeters.Using the differential phase delay to monitor the high sensitivity of lunar rover and the lunar rover The average moving speed of the car for 5 times is 0.056 m / s. The jitter of the lunar rover and its relationship with lunar surface topography are analyzed by using the spectrum of the residual after fitting the first order polynomial of differential phase delay.