A wide-area soil moisture detection system based on wireless network

A wireless network and soil moisture technology, applied in the field of sensing information, can solve problems such as unreliability, being in a waterlogged area, backfilling area, and the influence of moisture calculation, to achieve the effect of improving accuracy and reliability

CN104267045BActive Publication Date: 2017-01-18ZHEJIANG TUOPUYUN AGRI SCI & TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-01-18

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Abstract

The invention provides a wide-area soil moisture content detection system based on a wireless network. Based on the rule that a microwave retrodirection coefficient and a soil dielectric constant are highly correlated to each other and the soil dielectric constant is in positive proportion to the soil moisture content, the soil moisture content is measured in a wide area by utilizing a multi-polarization microwave radar scatterometer in a microwave transmitting manner, and sample soil moisture content data, surface temperature data, vegetation coverage data, terrain geometric characteristic data and soil physical attributed data, which are acquired by a ground fixed detection device and an onboard detection device, are fed through the wireless network, so that fine correction can be carried out on the basis of the microwave real soil moisture content numerical value, and the detection data reflecting the soil moisture content of the entire wide area range and the soil moisture content of an individual local place can be finally acquired.
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Description

technical field

[0001] The invention relates to a sensing information technology suitable for agriculture, and more particularly relates to a wide-area soil moisture detection system based on a wireless network. Background technique

[0002] Moisture content is the amount of water in the soil composition, usually expressed as a percentage. For agricultural production, soil moisture is an important indicator affecting plant growth. The soil with moisture index below 50% belongs to severe drought, which will cause the plants to stop growing until they dry up; the soil with moisture index below 60% belongs to mild drought, which will cause a certain degree of adverse effects on plant growth; the moisture index is 60%-80% The soil in this interval is suitable for plant growth; if the moisture content index is greater than 80%, it means that the soil moisture content is too high. If necessary, drainage measures should be taken, otherwise it may cause root corruption of plants. ...

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Embodiment Construction

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, and to make the above-mentioned purpose, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings .

[0034] The principle of the present invention is based on the law that the microwave backscattering coefficient has a strong correlation with the soil permittivity and the soil permittivity is proportional to the soil moisture, through the multi-polarization microwave radar scatterometer to emit microwaves in a wide area The backscattering coefficient is actually measured, and then the moisture value is obtained based on the measured coefficient, and fine correction and macroscopic fitting are performed.

[0035] The backscatter coefficient obtained based on microwave measurements is related to the following f...