Observation Capability of a Ground-Based Terahertz Radiometer for Vertical Profiles of Oxygen and Water Abundances in Martian Atmosphere
Observation Capability of a Ground-Based Terahertz Radiometer for Vertical Profiles of Oxygen and Water Abundances in Martian Atmosphere
复制标题
地基太赫兹辐射计对火星大气中氧气和水丰度垂直剖面的观测能力
DOI：
10.1109/tgrs.2022.3152271
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发表时间：
2022
影响因子：
8.2
通讯作者：
Kasai Yasuko
中科院分区：
文献类型：
--
作者：
Yamada Takayoshi;Baron Philippe;Neary Lori;Nishibori Toshiyuki;Larsson Richard;Kuroda Takeshi;Daerden Frank;Kasai Yasuko
我们提出了预期的性能为地基太赫兹（THz）辐射计，计划将在太赫兹EXplore-1（TEREX-1）火星探测微型航天器上发射。小型THz被动辐射计是为未来TEREX系列微型航天器研制的。该航天器为资源和技术有限的组织提供了一个机会，可以进行频繁的火星任务，非常适合资源勘探，而不是完全由政府领导的所有当前和过去的大型/巨型火星任务。TEREX-1辐射计的观测频率为474.64-475.64和486.64-487.64 GHz，分辨率为100 kHz，双边带噪声温度小于3000 K。理论误差分析与仪器特性进行评估的第一次大气氧分子（O2）和水蒸气（H2O）的仰视观测。在0-55 km和0-25 km的垂直分辨率范围内，O_2和H_2O的测量误差分别为7%~ 22%和14%~ 25%。TEREX-1还能够测量次要物质O3和H2 O2，在两个独立层内的精度优于30%。对于所有模拟，我们使用1 h的积分时间。我们的理论模拟表明，TEREX-1传感器的仪器特性能够观测到与大型任务相同水平的O2和H2O丰度的垂直剖面。
We present the expected performance for a ground-based terahertz (THz) radiometer, a plan to be launched on the TERahertz EXplore-1 (TEREX-1) Mars exploration microspacecraft. The small THz passive radiometer has been developed for the TEREX series of future microspacecrafts. This spacecraft is an opportunity for organizations with limited resources and technology to conduct frequent missions to Mars well suited for resource exploration in contrast to all of the current and past Mars missions of large/giant class missions with fully government lead. The observation frequencies of the TEREX-1 radiometer are 474.64–475.64 and 486.64–487.64 GHz with a 100-kHz resolution, and the double-sideband noise temperature less than 3000 K. A theoretical error analysis is performed with the instrument characteristics to assess for the first time up-looking observations of atmospheric oxygen molecules (O2) and water vapor (H2O). Measurement errors for O2and H2O are 7%–22% and 14%–25% with 8–17- and 5–10-km vertical resolution in the vertical ranges 0–55 and 0–25 km, respectively. TEREX-1 is also capable to measure minor species, O3and H2O2, with a precision better than 30% within two independent layers. We used the integration time of 1 h for all simulations. Our theoretical simulation showed the instrument characteristics of the TEREX-1 sensor are able to observe vertical profiles of O2and H2O abundances with the same level of the large class missions.