Lightweight and Compact Radiometers for Soil Moisture Measurement: A review

Ho, Trong Khoa; Feng, Jiewei; Bilawal, Farah; Shehab, Shahriar Hasan; Trinh, Kim Tuyen; Yang, Yang; Rüdiger, Christoph; Walker, Jeffrey P.; Karmakar, Nemai Chandra

doi:10.1109/mgrs.2021.3082179

IEEE Geosci. Remote Sens. Mag.

2022

DOI: 10.1109/mgrs.2021.3082179

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Lightweight and Compact Radiometers for Soil Moisture Measurement: A review

Trong Khoa Ho

Jiewei Feng

Farah Bilawal

et al.

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Cited by 3 publications

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“…Furthermore, its lightweight design and portability render it highly adaptable for various field applications, broadening its potential utility in different contexts. Several lightweight, compact, and cost-effective radiometers for SM retrieval have been described in [27]. A ground base portable L-band microwave radiometer intended for the application of PA has been developed by [28].…”

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SDR-Based Dual Polarized L-Band Microwave Radiometer Operating From Small UAS Platforms

Farhad,

Alam,

Biswas

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Passive microwave remote sensing is a vital tool for acquiring valuable information regarding the Earth's surface, with significant applications in agriculture, water management, forestry, and various environmental disciplines. Precision agricultural (PA) practices necessitate the availability of field-scale, high-resolution remote sensing data products. This study focuses on the design and development of a cost-effective, portable L-band microwave radiometer capable of operating from an unmanned aircraft system (UAS) platform to measure highresolution surface brightness temperature (TB). This radiometer consists of a dual-polarized (Horizontal polarized, H-pol and Vertical polarized, V-pol) antenna and a software-defined radio (SDR)-based receiver system with a 30 MHz sampling rate. The post-processing methodology encompasses the conversion of raw in-phase and quadratic (I&Q) surface emissions to radiation TB through internal and external calibrations. Radiometric measurements were conducted over an experimental site covering both bare soil within an agricultural field and a large water body. The results yielded a high-resolution TB map that effectively delineated the boundaries between land and water, and identified land surface features. The radiometric temperature measurements of the sky and blackbody demonstrated a standard deviation of 0.95 K for H-pol and 0.57 K for V-pol in the case of the sky and 0.39 K for both H-pol and V-pol in the case of the blackbody observations. The utilization of I&Q samples acquired via the radiometer digital back-end facilitates the generation of different time-frequency (TF) analyses through short-time Fourier transform (STFT) and power spectral density (PSD). The transformation of radiometer samples into TF representations aids in the identification and mitigation of radio frequency interference (RFI) originating from the instrument itself and external sources.

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mentioning

confidence: 99%

SDR-Based Dual Polarized L-Band Microwave Radiometer Operating From Small UAS Platforms

Farhad,

Alam,

Biswas

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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A portable microwave radiometer for proximal measurement of soil permittivity

Гудков

Agasieva

Сидоров

et al. 2022

Computers and Electronics in Agriculture

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An Algebraic Comparison of Synthetic Aperture Interferometry and Digital Beam Forming in Imaging Radiometry

2022

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Digital beam forming (DBF) and synthetic aperture interferometry (SAI) are signal processing techniques that mix the signals collected by an antenna array to obtain high-resolution images with the aid of a computer. This note aims at comparing these two approaches from an algebraic perspective with the illustrations of simulations conducted at microwaves frequencies within the frame of the Soil Moisture and Ocean Salinity (SMOS) mission. Although the two techniques are using the same signals and sharing the same goal, there are several differences that deserve attention. From the algebraic point of view, it is the case for the singular values distributions of the respective modeling matrices which are both rank-deficient but do not have the same sensitivity to the diversity of the array’s elementary antennas radiation patterns. As a consequence of this difference, the level and the angular signature of the reconstruction floor error are significantly lower with the DBF paradigm than with the SAI one.

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Lightweight and Compact Radiometers for Soil Moisture Measurement: A review

Cited by 3 publications

References 79 publications

SDR-Based Dual Polarized L-Band Microwave Radiometer Operating From Small UAS Platforms

SDR-Based Dual Polarized L-Band Microwave Radiometer Operating From Small UAS Platforms

A portable microwave radiometer for proximal measurement of soil permittivity

An Algebraic Comparison of Synthetic Aperture Interferometry and Digital Beam Forming in Imaging Radiometry

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