GPS multi-satellite fusion soil humidity monitoring method based on fuzzy entropy
A soil moisture and fuzzy entropy technology, applied in measurement devices, using microwaves to test moisture content, instruments, etc., can solve the problems of data source limitations, not considering the difference and complementarity of satellite data, and achieve the effect of improving the inversion effect.
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[0056] Such as figure 2 Shown, the GPS multi-satellite fusion soil moisture monitoring method based on fuzzy entropy of the present invention, comprises the following steps:
[0057] Step 1: Data Acquisition
[0058]Set up GPS receivers and antennas on the experimental site, and set up automatic weather station equipment to collect year-on-year soil moisture measurements and store them in RINEX format.
[0059] Step 2: Data Filtering
[0060] Extract the SNR, elevation angle, azimuth angle, and time of L1, L2, and L5 from the collected data according to the PRN, conduct preliminary screening on the extracted data, and eliminate the data whose SNR oscillation is not obvious.
[0061] Step 3: Data Preprocessing
[0062] Such as figure 1 As shown, the SNR of direct and reflected signals can be expressed as:
[0063]
[0064] In the formula, A d 、A m Respectively represent the amplitude of the direct and reflected signals, and ψ represents the phase difference between t...
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