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A Soil Moisture Retrieval Method for Single Frequency Microwave Radiometer

A microwave radiometer and soil moisture technology, applied in the field of microwave remote sensing, can solve the problems of difficulty in continuous monitoring in a large area, time-consuming and labor-intensive, etc., achieving the effect of no regional dependence, avoiding inversion errors, and overcoming a large amount of calculation.

Inactive Publication Date: 2016-03-16
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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  • A Soil Moisture Retrieval Method for Single Frequency Microwave Radiometer
  • A Soil Moisture Retrieval Method for Single Frequency Microwave Radiometer
  • A Soil Moisture Retrieval Method for Single Frequency Microwave Radiometer

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Embodiment Construction

[0021] This algorithm is based on the zero-stage radiation transmission model, which is commonly referred to as the τ-ω model. In this model, the effect of multiple scattering of electromagnetic waves between the atmosphere and vegetation layers is 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] The subscript p represents horizontal or vertical polarization, R sp Indicates the effective reflectivity of the soil, T s And T c Respectively represent the temperature of soil and vegetation canopy, τ p It represents the optical thickness of vegetation in the observation direction, and ω represents the single scattering albedo of vegetation.

[0024] In order to simplify the inversion process, it is assumed that ω is equal to zero in the algorithm, and τ is assumed p Unaffected by polarization, this assumption is widely used at the satellite scale. At the same time, it is further ass...

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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 method for inversion of soil moisture with a single frequency microwave radiometer. Background technique [0002] Soil moisture is a very important part of the earth's ecosystem. It plays a key role in the exchange of water and energy in the global hydrosphere, atmosphere and biosphere. Frequent global soil moisture observations are essential to many environmental disciplines, such as flood monitoring, improved soil erosion models, weather and climate forecasts, and agricultural applications. Therefore, obtaining information on the temporal and spatial distribution of soil moisture in a large area is an urgent problem to be solved. [0003] The traditional soil moisture measurement method is based on point measurement, which is not only time-consuming and labor-intensive, but also difficult to achieve large-scale continuous monitoring. The spatial resolution of passive m...

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Application Information

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Patent Type & Authority Patents(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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