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A Method of Estimating Soil Moisture Using GPS Signal-to-Noise Ratio Level Data

A soil moisture and signal-to-noise ratio technology, which is applied in the field of electronic information, can solve the problems of not providing signal-to-noise ratio data and being easily affected by ground roughness, so as to avoid dependence and expand the effective application range.

Active Publication Date: 2017-09-26
WUHAN UNIV
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Problems solved by technology

Wuhan University has used antennas and receivers to conduct research on the ratio of reflected signals to direct signals to retrieve soil moisture (Yan Songhua, Zhang Xunxie, Research on Soil Moisture Retrieval Based on GNSS-R Signals, Journal of Radio Science, 2010, No. 1 Period), but this method mainly uses the ratio of direct signal and reflected signal power, which is easily affected by ground roughness
Another method is to use the differential method of the GPS interference signal, for example, use the signal-to-noise ratio data in the interference signal to realize the inversion of soil moisture, although the soil moisture obtained by the inversion has high accuracy (the invention patent with the application number of 2014102755487: Soil moisture retrieval method based on the low elevation angle signal received by Beidou reference station), but the SNR data is only used for correction during positioning, so most CORS stations do not provide SNR data

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  • A Method of Estimating Soil Moisture Using GPS Signal-to-Noise Ratio Level Data

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[0028] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0029] The GPS signal-to-noise ratio level data sn_rnx used in the present invention is actually a quantization of the signal-to-noise ratio data when the receiver is receiving, and satisfies the following relationship:

[0030] sn_rnx=MIN(MAX(INT(sn_raw / 6,)1),9)

[0031] Where sn_raw is the GPS signal-to-noise ratio data (referenced in Section 7 of Chapter 5 in the third version of the RINEX format, titled Signal strengths). In the RINEX format, numbers from 1 to 9 are used to represent the SNR level. Where 1 indicates the minimum possible SNR level, 5 ind...

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Abstract

The invention discloses a method for estimating soil moisture by using the GPS signal-to-noise ratio level data sn_rnx. The method screens the data according to the characteristic of sn_rnx itself being a rectangular wave transformation, extracts the phase information according to the spectrum analysis method and the least square method, and finally Set up the functional relationship between phase and humidity and invert steps such as soil moisture according to this functional relationship; the feature of the present invention is to adopt the GPS signal-to-noise ratio level data sn_rnx of CORS station for the first time to carry out the inversion of soil moisture, avoiding original signal-to-noise Compared with the dependence of the data sn_raw, it can fully utilize the historical data of the CORS station to estimate the soil moisture, and the utilization rate is high.

Description

technical field [0001] The invention belongs to the technical field of electronic information, and relates to a data inversion soil moisture method based on a CORS station, in particular to a method for estimating soil moisture by using GPS signal-to-noise ratio level data sn_rnx. Background technique [0002] Soil moisture is soil water content, which is an important physical substance of soil. It has already become an important research object in hydrology, meteorology, ecology, agriculture and earth science, and its accurate and long-term monitoring is the basis of environmental science research. [0003] At present, there are mainly the following methods for measuring soil moisture, which have various advantages and disadvantages. [0004] Traditional measurement methods include drying method, soil moisture meter method, neutron meter method, electrical resistance method, etc. (Zhang Xiaohu, Li Xinping. Research progress of several commonly used soil moisture measuremen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/00
Inventor 严颂华陕娟陈能成
Owner WUHAN UNIV
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