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Method and apparatus for detecting deep soil humidity through microwave remote sensing

A deep soil and detection method technology, applied in the field of microwave remote sensing, can solve the problems of cumbersome post-processing, insufficient, time-consuming and labor-intensive problems

Active Publication Date: 2012-10-17
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

Soil moisture varies greatly in time and space. Traditional soil moisture measurement methods, such as gravimetric measurement and time-domain reflectometer measurement, are all point-based measurement methods, which require on-site operations and complicated post-processing processes, which are time-consuming and labor-intensive. Moreover, it is impossible to obtain the spatial and temporal distribution information of soil moisture in a large range within the required time, so it is difficult to extend this traditional soil moisture measurement method to large-scale and dynamic applications. , climatology, ecology and other aspects of the application is becoming less and less

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  • Method and apparatus for detecting deep soil humidity through microwave remote sensing
  • Method and apparatus for detecting deep soil humidity through microwave remote sensing
  • Method and apparatus for detecting deep soil humidity through microwave remote sensing

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Embodiment Construction

[0044] The invention utilizes the penetrability of electromagnetic waves in the VHF / UHF frequency band to invent a deep soil moisture radar remote sensing test system to measure deep soil (according to different soil types, different humidity, different vegetation coverage, etc., the depth is 0.1-10m). Electricity constant and humidity. The moisture of the soil has a specific relationship with the dielectric constant of the soil, which is determined by the dielectric model of the soil; the electromagnetic waves in the VHF / UHF frequency band are transmitted to the target soil, part of the energy is scattered by the rough soil surface, and the other part of the energy penetrates into the soil. Propagated in a heterogeneous medium; the echo signal includes the scattering component of the rough surface and the soil scattering component. In the deep soil moisture testing device of the present invention, the transmitter transmits a radio frequency signal in the VHF / UHF frequency ban...

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Abstract

The invention discloses a method and an apparatus for detecting deep soil humidity through microwave remote sensing, and relates to the technology of microwave remote sensing. The method for detecting deep soil humidity through microwave remote sensing is provided by utilizing an object-penetrative property of microwave low-frequency bands and also disclosed is the apparatus for detecting deep soil humidity through microwave remote sensing. Backscattering coefficients of soils are tested. Soil humidity of different depth is obtained through inverting a deep soil scattering model and a soil dielectric model. A three dimensional image of the distribution of soil humidity in a tested area is formed. The working frequency of the apparatus is in the VHF / UHF band. Soil dielectric constants and humidity parameters of different types of soils in a depth of 0.1-10 m can be detected in a contactless and lossless manner.

Description

technical field [0001] The invention relates to the technical field of microwave remote sensing, and relates to a microwave remote sensing detection method and device for deep soil moisture. Background technique [0002] Deep soil moisture is an important parameter in fields such as agriculture, forestry, hydrology, climate, and ecology. Countries have invested heavily in soil moisture detection equipment. Soil moisture varies greatly in time and space. Traditional soil moisture measurement methods, such as gravimetric measurement and time-domain reflectometer measurement, are all point-based measurement methods, which require on-site operations and complicated post-processing processes, which are time-consuming and labor-intensive. Moreover, it is impossible to obtain the spatial and temporal distribution information of soil moisture in a large range within the required time, so it is difficult to extend this traditional soil moisture measurement method to large-scale and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/00G01N22/04
CPCG01N22/04G01N33/246
Inventor 张晓娟林志伟许鑫
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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