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Radar remote sensing method for detecting distribution of water content in soil in depth direction

A technology of soil water content and depth direction, which is applied in the field of detecting soil water content distribution in depth direction

Active Publication Date: 2012-08-01
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the traditional measurement method using the L or C band is limited by the penetration depth of electromagnetic waves and can only obtain the dielectric constant of the soil surface

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  • Radar remote sensing method for detecting distribution of water content in soil in depth direction
  • Radar remote sensing method for detecting distribution of water content in soil in depth direction
  • Radar remote sensing method for detecting distribution of water content in soil in depth direction

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Embodiment

[0031] The method of the present invention will be described below in conjunction with the accompanying drawings, and the embodiments described here are only for the convenience of understanding the present invention without any limitation thereto.

[0032] The radar remote sensing method for detecting the distribution of soil water content in the depth direction of the present invention uses electromagnetic waves at two frequency points of 150MHz and 450MHz to detect bare soil, the incident angles are 45° and 60°, and the radar is placed at a distance of about 40m high foundation platform.

[0033] Such as figure 1 As shown, it is the echo of the soil when the horizontally polarized 450MHz electromagnetic wave is incident at 45°.

[0034] figure 2 As shown in the figure, it is the echo signal after the direct wave is removed by using the method of windowing in the time domain.

[0035] Similarly, the time-domain windowing method is used to remove the direct wave of the 15...

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Abstract

The invention which discloses a radar remote sensing method for detecting the distribution of the water content in soil in a depth direction relates to the radar remote sensing detection technology. The method comprises the following steps: 1, respectively adopting two modes of horizontal polarization and vertical polarization to measure the scattering field of the soil under multiple visual angle and multiple frequency observation; 2, filtering out components of direct waves in radar echoes; 3, scaling echo data; and 4, utilizing the scattering model and the dielectric constant of the soil to obtain the distribution of the water content in the soil in the depth direction. The radar remote sensing method for detecting the distribution of the water content in the soil in the depth direction of the invention allows the distribution of the water content in soil with the depth under the soil surface of 0-3m to be detected, and can be applied to ground, air and space base remote sensing monitoring platforms.

Description

technical field [0001] The invention relates to the technical field of radar remote sensing detection, in particular to a method for detecting soil water content distribution in a depth direction by using co-polarization ratio as an observation quantity. Background technique [0002] Deep soil water content has important applications in agriculture, forestry, animal husbandry, meteorology, environment and other related fields. Since there is a definite correspondence between the soil moisture content and its dielectric constant, the soil moisture content information can be obtained by measuring the dielectric constant of the soil. The electromagnetic wave is scattered by the soil during propagation, and the energy distribution of the scattered wave in space is related to the roughness of the soil surface and the dielectric constant under the surface. By analyzing the radar echo of the soil, the dielectric constant of the soil can be obtained, and then the water content of t...

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Application Information

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IPC IPC(8): G01N22/04G01N23/20G01S7/02
Inventor 林志伟许鑫张晓娟方广有
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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