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Method for measuring large-area soil humidity

A soil moisture and measurement method technology, applied in the field of agricultural environmental monitoring, can solve problems such as troublesome application, additional calibration process, increased production and debugging costs, etc., to achieve cost savings, high information utilization, and reduced development costs and maintenance costs Effect

Inactive Publication Date: 2010-12-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And completely consistent antenna and receiver production will increase the cost of production and commissioning
An alternative method, the method of doing channel correction, requires an additional calibration process, which brings troubles to the application

Method used

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  • Method for measuring large-area soil humidity
  • Method for measuring large-area soil humidity
  • Method for measuring large-area soil humidity

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Embodiment Construction

[0022] Aiming at the limitations of the existing methods, the purpose of the present invention is to provide a method for remotely measuring the humidity of a large area of ​​bare soil by using the interference phenomenon of the GPS direct signal and the signal reflected by the ground soil, which is applied to agricultural production. This method uses the vertically polarized antenna to receive the interference signal formed by the direct signal and the soil reflection signal; uses the characteristics of the interference signal, that is, the phase inflection point of the interference signal power sequence corresponds to a specific signal incident angle; The dielectric constant of the soil surface, which further inverts the soil moisture.

[0023] The present invention considers that if one antenna can receive both the direct wave signal and the reflected wave signal at the same time, then the requirement of dual antennas can be avoided. But at this time the ratio of reflected ...

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Abstract

The invention provides a method for measuring large-area soil humidity, which comprises the following step of: mounting a vertical polarized receiving antenna, a GPS (Global Positioning System) receiver and a computer for carrying out signal processing. The measuring process is carried out by utilizing the interference effect of a GPS signal and a reflecting signal thereof. By utilizing the widely existing GPS signal as a signal source, the method can be used for carrying out all-weather large-area measurement, has low cost and more further simplifies a receiving device by utilizing the interference effect.

Description

technical field [0001] The invention relates to the field of agricultural environment monitoring, in particular to a method for measuring the humidity of large-area bare soil. Background technique [0002] Soil moisture is the soil water content, which is an important physical property of soil. Soil moisture is one of the important parameters for the energy and material exchange of soil-vegetation-atmosphere system and the management of land resources and environment. Monitoring the temporal and spatial variation characteristics of surface soil moisture is of great significance for the study of natural and ecological environmental issues. [0003] At present, there are mainly the following methods for measuring soil moisture, and they have their own advantages and disadvantages. [0004] The drying weighing method is intuitive and accurate, but its operation is complicated. Capacitance method (capacitive soil moisture sensor and its manufacturing method, patent number 2005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/04
Inventor 严颂华龚健雅
Owner WUHAN UNIV
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