Remote Sensing of Root-Zone Soil Moisture Using I- and P-Band Signals of Opportunity: Instrument Validation Studies
Remote Sensing of Root-Zone Soil Moisture Using I- and P-Band Signals of Opportunity: Instrument Validation Studies
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使用 I 和 P 波段机会信号遥感根区土壤湿度：仪器验证研究
DOI：
10.1109/igarss.2018.8518772
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
G. Pignotti
中科院分区：
文献类型：
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作者：
J. Garrison;M. Kurum;Benjamin R. Nold;J. Piepmeier;M. Vega;R. Bindlish;G. Pignotti
根区土壤湿度（RZSM）是气象、水文学和农业中的重要变量。足以感测 RZSM 的穿透深度需要低于约 500 MHz 的频率（I 和 P 频段）。由于天线尺寸、射频干扰 (RFI) 和频谱竞争，这些频段的有源或无源微波传感面临着巨大的技术挑战。使用机会信号 (SoOp)（例如数字卫星发射机）的双基地雷达提供了一种替代方法，即重新利用已占用分配给通信的频段的强大信号。 2016 年 10 月使用 240-270 MHz 源进行了机载实验，随后在 2017 年生长季节从农业研究地点的固定塔位置使用 360-380 MHz 进行了活动。目前正在 2018 年赛季之前安装一项新的活动，其中还包括 I 频段 (137 MHz)。本文将总结支持减少这些活动数据和开发土壤湿度剖面检索的活动。
Root zone soil moisture (RZSM) is an essential variable in meteorology, hydrology, and agriculture. A penetration depth sufficient to sense RZSM requires frequencies below about 500 MHz (I- and P-band). Active or passive microwave sensing in these bands presents substantial technical challenges due to antenna size, radio frequency interference (RFI) and competition for spectrum. Bistatic radar using Signal of Opportunity (SoOp) (e.g. digital satellite transmitters) offers an alternative approach, through reutilizing powerful signals already occupying bands allocated for communications. Airborne experiments using 240–270 MHz sources were conducted in October 2016, followed by a campaign using 360–380 MHz from a fixed tower location in an agricultural research site during the 2017 growing season. A new campaign that will also include I-band (137 MHz) is presently being installed in advance of the 2018 season. This paper will summarize activities to support the reduction of data from these campaigns and development of soil moisture profile retrievals.