A method and device for monitoring the freezing and thawing state of the ground surface

Abstract

The invention provides a method and a device for monitoring the freeze-thaw state of the earth surface. According to the method and the device, a transmitter of a global satellite navigation system is adopted to emit a direct signal, and the direct signal is reflected by the freeze-thaw earth surface to form a reflected signal; a receiver of the global satellite navigation system is adopted to receive the direct signal and the reflected signal; a denoising system is adopted to carry out the denoising treatment on the direct signal and the reflected signal received by the receiver; an oscillograph generator is adopted to generate an oscillograph of the freeze-thaw earth surface according to the direct signal and the reflected signal denoised; an oscillograph discriminator is adopted to discriminate the oscillograph to determine the freeze-thaw state of the freeze-thaw earth surface. The method and the device adopt the existing direct signal of the global satellite navigation system as the signal source, reduce power consumption and the cost, improve the space-time resolution, improve accuracy of monitoring results, and are strong in signal penetrability and relatively low in sensitivity of snow covered regions.

Description

technical field [0001] The invention relates to a monitoring method and device for the freezing and thawing state of the ground surface. Background technique [0002] Surface freezing and thawing occurs periodically, covers a large area, and is highly dynamic. It is an important factor affecting the environment and climate, and is an important factor affecting environmental processes such as land surface processes, regional climate, and dust forecasts. How to effectively monitor the freezing and thawing state of the surface and its related physical parameters is one of the important topics and contents that the majority of scientific researchers are committed to studying. [0003] The development of remote sensing technology has made it possible to monitor the freezing and thawing status of the ground surface in a large area and dynamically. Microwave remote sensing is sensitive to changes in soil moisture and can work all day and all day long. At the same time, microwave r...

AI Technical Summary

Problems solved by technology

However, the current active microwave (radar) or passive microwave (radiometer) has many problems such as high power consumption, high cost, and insufficient time-space resolution for practical applications, and may affect the monitoring results due to sensitivity to snow-covered areas accuracy, which limits the development of remote sensing monitoring of the surface freeze-thaw state

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