A Soil Moisture Calibration Measurement Method Based on GPS Reflection Signal
A technology of reflected signals and soil moisture, applied in the field of inversion and detection using the reflected signals of navigation satellites, can solve the problems of differences and neglect, and achieve the effect of small errors and simple calculation process.
Active Publication Date: 2016-04-06
山东航向电子科技有限公司
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Since the dielectric model is a theoretical value, the dielectric constant obtained by using the reflection coefficient will be different from the actual value, and the influence of soil moisture content at different temperatures on the dielectric constant will not be considered
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[0035] 1. Set up experimental equipment in the area where soil moisture needs to be observed and retrieved, and follow the attached figure 1 The steps in the above are carried out to calibrate the soil moisture corresponding to the reflection signals of different satellites to 100 (here, the reflection antenna needs to be pointed to the water surface in the fixed-point observation area), and the attached data obtained from the analysis of the measured data Figure 4 It can be shown that the power of the reflected signal will be greatly affected when the reflection channel satellite changes. The minimum value of the satellite elevation angle of the receiver reflection channel used for the measurement data is 65 degrees, and the time measurement is performed on the satellite distribution map. The visible time of each GPS satellite is 80 minutes respectively. If there are multiple satellites with an elevation angle greater than 65 degrees at the same time, select the satellite wit...
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Abstract
The invention discloses a soil humidity calibrating and measuring method based on a global positioning system (GPS) reflected signal. The method comprises seven steps: I. establishing measuring equipment for linear calibration; II. carrying out frequency conversion and noise reduction treatment on collected signals of direct-radiation and reflecting antennas by virtue of a radio frequency module and converting the signals into intermediate frequency signals; III. carrying out digital-analog conversion on the processed signals of the radio frequency module by virtue of an analog / digital (A / D) quantifying module, transmitting the signals and implementing related treatment; IV. implementing satellite pseudo random noise (PRN) extraction and storage on information of reflected signal related channels and establishing a database; V. carrying out inversion data measurement on five typical values of the reflecting antenna pointing to a soil humidity value and storing according to various satellite PRN; VI. respectively recording each satellite and corresponding soil humidity values and establishing a relation curve between corresponding reflected signal related power values and soil humidity values; and VII. carrying out linear fitting treatment by virtue of the humidity curve of the satellite PRN and the measured reflected signal power values so as to obtain a soil humidity corresponding to the reflected signal power value.
Description
technical field [0001] The invention relates to a soil moisture calibration measurement method based on GPS reflection signals. The method uses the reflection power value stored in the GPS reflection signal soil moisture measuring instrument to directly invert the calibration measurement model of soil moisture, and belongs to the inversion detection method using navigation satellite reflection signals. technology field. Background technique [0002] GPS-R soil moisture retrieval is a specific application of using satellite signals to remote sense the direction of vegetation on the earth's surface, and it is a passive dual-base or multi-base remote sensing technology. From the perspective of the basic theory of electromagnetic wave propagation, the reflected signal carries characteristic information of the reflecting surface, and changes in the reflected signal waveform, polarization characteristics, and changes in parameters such as amplitude, phase, and frequency all direct...
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IPC IPC(8): G01N33/24
Inventor 杨东凯高超群朱云龙王强
Owner 山东航向电子科技有限公司