Recent Status of SELENE-2/VLBI Instrument
Recent Status of SELENE-2/VLBI Instrument
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DOI：
10.2322/tastj.12.pk_13
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
F. Kikuchi;Koji Matsumoto;H. Hanada;S. Tsuruta;K. Asari;Y. Kono;R. Yamada;T. Iwata;S. Sasaki;Kesato Takahashi;Y. Uchibori;T. Komai;Takahiro Nakamura
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文献类型：
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作者：
F. Kikuchi;Koji Matsumoto;H. Hanada;S. Tsuruta;K. Asari;Y. Kono;R. Yamada;T. Iwata;S. Sasaki;Kesato Takahashi;Y. Uchibori;T. Komai;Takahiro Nakamura
月球内部结构是月球演化和起源的最重要线索之一。为了改进SELENE-2的内部结构模型，特别是改进了内核的内部结构模型，提出了一种基于VLBI差分观测的月球重力测量方法dVLBI。作为对dVLBI任务的最近回顾，列出了两个主题。首先，为了节约发射机的电能，引入了新的运行模式。在双频和间歇传输模式下，功耗从9.6W降低到2.1W。对月球势勒夫数K2的误差估计表明，在间歇传输模式的情况下，可以达到期望的精度。其次，设计了将安装在着陆器上的S频段生存天线。利用解析模型进行的计算模拟表明，在-200到+120度的温度范围内，可以获得所需的增益为-5dBI、波束宽度为60度、带宽为140 MHz的性能。
The internal structure of the Moon is one of the most important clues to the evolution and origin of the Moon. A lunar gravimetry by differential VLBI observation, named dVLBI, is proposed for the SELENE-2 to improve the internal structure model, especially for the core. As a recent review of the dVLBI mission, two topics are shown. First, new operation modes are introduced for the purpose of saving the transmitter’s electric power. The power consumption is reduced from 9.6 W to 2.1 W in the case of the dual frequency and intermittent transmission modes. Error estimation of the lunar potential Love number k2 shows that the desired accuracy can be achieved in the case of the intermittent transmission mode. Second, the S-band survival antenna that will be installed on the lander is designed. A computational simulation using an analytic model shows that the required performances, which are gain of -5 dBi, beamwidth of 60 degrees, and bandwidth of 140 MHz, are achieved at a temperature within a range of -200 to +120 degrees.