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Soil moisture inversion method of mono-frequency microwave radiometer

A microwave radiometer and soil moisture technology, applied in the field of microwave remote sensing, can solve problems such as difficult continuous monitoring in a large area, time-consuming and labor-intensive, and achieve the effects of no regional dependence, avoiding inversion errors, and reducing the difficulty of commercial application

Inactive Publication Date: 2013-06-12
CENT FOR EARTH OBSERVATION & DIGITAL EARTH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0003] The traditional soil moisture measurement method is based on point measurement, which is not only time-consuming and laborious, but also difficult to achieve large-scale continuous monitoring

Method used

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  • Soil moisture inversion method of mono-frequency microwave radiometer

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Embodiment Construction

[0021] This algorithm is based on the zero-stage radiative transfer model, commonly known as the τ-ω model. In this model, the effects of multiple scattering of electromagnetic waves in the atmosphere and vegetation layers are ignored. The formula of the model is shown in (1):

[0022] T Bp＝ (1-R sp )·T s ·exp(-τ p )+(1-ω)·T c ·[1-exp(-τ p )]·[1+R sp ·exp(-τ p )] (1)

[0023] where the subscript p indicates horizontal or vertical polarization, and R sp Indicates the soil effective reflectance, T s and T c represent the temperature of soil and vegetation canopy, respectively, τ p Indicates the optical thickness of the vegetation in the observation direction, and ω indicates the single scattering albedo of the vegetation.

[0024] In order to simplify the inversion process, ω is assumed to be equal to zero in the algorithm, and τ p Independent of polarization, this assumption is widely applied at the satellite scale. At the same time, it is further assumed ...

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Abstract

The invention provides a soil moisture inversion method of a mono-frequency microwave radiometer and belongs to the field of microwave remote sensing. The soil moisture inversion method of the mono-frequency microwave radiometer is neither a multi-parameter simultaneous inversion method, nor an experience regression method, but uses the minimum auxiliary data, and the soil moisture is obtained by the single-parameter inversion method. According to the soil moisture inversion method of the mono-frequency microwave radiometer, the problems existing in the multi-parameter inversion of multiple solutions and huge calculation amount are solved, and the inversion error due to the fact that roughness is set to be a definite value in line printer remover (LPRM) algorithm is also avoided. Meanwhile compared with a science clubs of America (SCA) algorithm which excessively dependent on auxiliary data, the auxiliary data used by the soil moisture inversion method of the mono-frequency microwave radiometer are only soil texture data which are globally and freely shared, and the business application difficulty of the soil moisture inversion is greatly reduced.

Description

technical field [0001] The invention relates to the field of microwave remote sensing, and mainly relates to a single-frequency microwave radiometer soil moisture inversion method. Background technique [0002] Soil moisture is a very important part of the earth's ecosystem, and it plays a key role in the exchange of water and energy between the global hydrosphere, atmosphere and biosphere. Frequent global soil moisture observations are critical for many environmental disciplines, such as flood monitoring, improved soil erosion models, weather and climate forecasting, and agricultural applications. Therefore, it is an urgent problem to obtain the spatial and temporal distribution information of large-scale surface soil moisture. [0003] The traditional soil moisture measurement method is based on point measurement, which is not only time-consuming and laborious, but also difficult to achieve large-scale continuous monitoring. The spatial resolution of passive microwave se...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/04
Inventor 陈权曾江源李震
Owner CENT FOR EARTH OBSERVATION & DIGITAL EARTH CHINESE ACADEMY OF SCI
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