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首页> 外文期刊>Space Science Reviews >Ground compatibility tests for gravity measurement of SELENE: Accuracies of two- and four-way doppler and range measurements
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Ground compatibility tests for gravity measurement of SELENE: Accuracies of two- and four-way doppler and range measurements

机译：SELENE重力测量的地面兼容性测试：两向和四向多普勒和距离测量的精度

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The Japanese lunar mission Selenological and Engineering Explorer (SELENE) was launched in September 2007 and continued its mission until June 2009, when the main orbiter impacted with the surface of the Moon. SELENE consisted of three satellites: Main, Rstar, and Vstar. Rstar's tasks were to forward up-link signals from the Usuada Deep Space Center (UDSC) to Main, and to down-link returning signals from Main to UDSC. We refer to this tracking sub-system as a four-way Doppler measurement. In contrast, conventional tracking systems between Rstar and UDSC as well as between Main and ground stations are referred to as two-way Doppler and range measurements. Using Main and Rstar, we successfully observed the gravity field over the farside of the Moon. Because four-way Doppler measurements via a relay sub-satellite were a fundamental experiment in space for Japanese space agencies, compatibility of radiometric instruments onboard Main and Rstar to UDSC were carefully examined at the UDSC using components manufactured for flight models. These tests not only proved the feasibility of the four-way Doppler measurements but also provided biases and variations of the four-way Doppler and two-way Doppler and range measurements that were later taken into account during the processing of tracking data and the analysis of the lunar global gravity field.
机译：日本的月球飞行任务“科学与工程探索者”号（SELENE）于2007年9月发射升空，一直持续到2009年6月，当时主要的轨道飞行器撞击月球表面。 SELENE由三颗卫星组成：Main，Rstar和Vstar。 Rstar的任务是将来自Usuada深空中心（UDSC）的上行链路信号转发到Main，以及将来自Main的下行链路返回信号转发到UDSC。我们将此跟踪子系统称为四向多普勒测量。相反，Rstar和UDSC之间以及主站和地面站之间的常规跟​​踪系统被称为双向多普勒和距离测量。使用Main和Rstar，我们成功地观测了月球远端的重力场。因为通过中继子卫星进行的四向多普勒测量是日本航天局在太空进行的一项基础实验，所以在UDSC上使用飞机模型制造的组件仔细检查了Main和Rstar上的辐射测量仪器与UDSC的兼容性。这些测试不仅证明了四向多普勒测量的可行性，而且还提供了四向多普勒和两向多普勒以及范围测量的偏差和变化，这些误差随后在处理跟踪数据和分析噪声时被考虑在内。月球全球引力场。

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