CN113376184A - Soil humidity detection method and device - Google Patents
Soil humidity detection method and device Download PDFInfo
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Abstract
The application discloses a soil humidity detection method and a device, comprising the following steps: the system comprises a soil container, a millimeter wave radar, a data capture module, a signal transmitting antenna and a signal receiving antenna, wherein the signal transmitting antenna transmits a linear frequency modulation transmitting signal to the soil surface, and the signal receiving antenna acquires a linear frequency modulation reflected signal; the millimeter wave radar combines the two signals into an orthogonal signal, and performs frequency conversion processing to obtain an intermediate frequency suppression signal; the data capture module is used for combining the intermediate frequency inhibition signals, performing fast Fourier transform to obtain a frequency domain map, wherein the frequency domain map reflects the reflected energy information of the soil surface, and the soil humidity information can be obtained according to the reflected energy information. The method solves the problems that when the frequency domain reflection method is adopted to detect the soil humidity, the frequency information of the frequency sweeping signals is fixed, the obtained reflection information is not comprehensive enough and diverse, the effect of continuous measurement cannot be achieved, the detection speed of the soil humidity is low, and the detection efficiency is not high.
Description
Technical Field
The application relates to the technical field of soil detection, in particular to a soil humidity detection method and device.
Background
The soil humidity refers to the water content of soil and is an important physical parameter of the soil. Meanwhile, the water content of the soil is also a key index in agricultural production conditions, and the size of the water content of the soil plays an important role in the growth of crops. Therefore, the method has great significance in detecting the soil humidity.
At present, in the prior art, a Frequency Domain Reflectometry (FDR) is often used to detect soil humidity, a Frequency sweep signal of a specific Frequency band is sent to the soil surface, then a reflection signal reflected by the soil surface is obtained, and Frequency Domain information of the reflection signal is analyzed to finally obtain soil humidity information. The frequency domain reflection method does not directly contact with soil, cannot damage the soil, has the advantages of short measurement time, high measurement precision and relatively low cost, and has obvious advantages and wide application compared with other methods.
When the frequency domain reflection method is adopted to detect the soil humidity, electromagnetic pulses, single frequency signals or multi-frequency signals of a certain specific frequency band are required to be adopted as sweep frequency signals to carry out frequency domain reflection detection on the soil, the frequency information of the sweep frequency signals is fixed, the obtained reflection information is not comprehensive and diverse enough, the effect of continuous measurement cannot be achieved, the detection speed of the soil humidity is low, and the detection efficiency is not high.
Disclosure of Invention
In order to solve the problems that when a frequency domain reflection method is adopted to detect the soil humidity, electromagnetic pulses of a certain specific frequency band, single frequency signals or multi-frequency signals are required to be adopted as sweep frequency signals to perform frequency domain reflection detection on the soil, the frequency information of the sweep frequency signals is fixed, the obtained reflection information is not comprehensive and diverse enough, the effect of continuous measurement cannot be achieved, the detection speed of the soil humidity is low, and the detection efficiency is not high, the application discloses a soil humidity detection method and a device through the following embodiments.
The application discloses in a first aspect, a soil humidity detection method is applied to a soil humidity detection device, soil humidity detection device includes soil container, millimeter wave radar and data capture module, wherein, the soil container with connect through the fixed bolster between the millimeter wave radar, the millimeter wave radar is pressed close to one side of soil container is equipped with signal transmitting antenna and signal receiving antenna, the millimeter wave radar reaches connect through the data line between the data capture module, a soil humidity detection method includes:
the signal transmitting antenna transmits a linear frequency modulation transmitting signal to the soil surface of the soil container;
the signal receiving antenna acquires a linear frequency modulation reflected signal reflected by the soil surface;
the millimeter wave radar acquires the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal, and combines the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to acquire an orthogonal signal;
the millimeter wave radar carries out frequency conversion processing on the orthogonal signal and obtains an intermediate frequency suppression signal;
the data capture module is used for merging the intermediate frequency suppression signals to obtain merged data;
the data capturing module performs fast Fourier transform on the merged data to acquire a frequency domain map;
the data capturing module acquires the reflected energy information of the soil surface according to the frequency domain map;
and the data capturing module acquires soil humidity information of the soil in the soil container according to the reflected energy information.
Optionally, the data capturing module performs merging processing on the if suppression signal to obtain merged data, including:
the data capture module reads a binary file of the intermediate frequency suppression signal and combines data in the binary file into decimal data;
and the data capturing module is used for combining the real part and the imaginary part of the decimal data to obtain combined data.
Optionally, the data capturing module performs fast fourier transform on the merged data to obtain a frequency domain map, including:
the data capture module averages the merged data and obtains a 4 x 256 matrix;
the data capture module converts the one 4 x 256 matrix into 4 1 x 256 matrices;
and the data capturing module performs 256-point fast Fourier transformation on the 4 matrices of 1 x 256 to obtain a frequency domain map.
Optionally, the data capturing module obtains soil humidity information of soil in the soil container according to the reflected energy information, including:
the data capturing module acquires the dielectric constant of the soil in the soil container according to the reflected energy information;
and the data capturing module acquires soil humidity information of the soil in the soil container according to the dielectric constant of the soil in the soil container.
The second aspect of the present application discloses a soil humidity detection device, which is applied to the soil humidity detection method disclosed in the first aspect of the present application, the soil humidity detection device comprising: the device comprises a soil container, a millimeter wave radar and a data capture module, wherein the soil container is connected with the millimeter wave radar through a fixed support, a signal transmitting antenna and a signal receiving antenna are arranged on one side, close to the soil container, of the millimeter wave radar, and the millimeter wave radar is connected with the data capture module through a data line;
wherein the signal transmitting antenna comprises:
the signal transmitting module is used for transmitting a linear frequency modulation transmitting signal to the soil surface of the soil container;
the signal receiving antenna includes:
the signal reflection module is used for acquiring a linear frequency modulation reflection signal reflected by the soil surface;
the millimeter wave radar includes:
the orthogonal signal acquisition module is used for acquiring the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal, and combining the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to acquire an orthogonal signal;
the intermediate frequency suppression signal acquisition module is used for carrying out frequency conversion processing on the orthogonal signal and acquiring an intermediate frequency suppression signal;
the data capture module includes:
the data merging module is used for merging the intermediate frequency suppression signals to acquire merged data;
the frequency domain map acquisition module is used for performing fast Fourier transform on the combined data to acquire a frequency domain map;
the reflected energy information acquisition module is used for acquiring the reflected energy information of the soil surface according to the frequency domain map;
and the soil humidity information acquisition module is used for acquiring the soil humidity information of the soil in the soil container according to the reflected energy information.
Optionally, the data merging module includes:
the data combination unit is used for reading the binary file of the intermediate frequency suppression signal by the data capture module and combining the data in the binary file into decimal data;
and the data merging unit is used for merging the real part and the imaginary part of the decimal data by the data capturing module to obtain merged data.
Optionally, the frequency domain map obtaining module includes:
a first matrix obtaining unit, configured to average the merged data to obtain a 4 × 256 matrix;
a second matrix obtaining unit, configured to convert the one 4 × 256 matrix into 4 1 × 256 matrices;
and the frequency domain map obtaining unit is used for carrying out 256-point fast Fourier change on the 4 matrices of 1 x 256 to obtain a frequency domain map.
Optionally, the soil humidity information obtaining module includes:
the dielectric constant acquisition unit is used for acquiring the dielectric constant of the soil in the soil container according to the reflected energy information;
and the soil humidity information acquisition unit is used for acquiring the soil humidity information of the soil in the soil container according to the dielectric constant of the soil in the soil container.
Optionally, a synthesizer and a mixer are further disposed on a side of the millimeter wave radar close to the soil container;
the synthesizer is used for acquiring the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal, and combining the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to acquire an orthogonal signal;
the frequency mixer is used for carrying out frequency conversion processing on the orthogonal signals and acquiring intermediate frequency suppression signals.
Optionally, there is one signal transmitting antenna and four signal receiving antennas.
The application discloses a soil humidity detection method and a device, comprising the following steps: the system comprises a soil container, a millimeter wave radar and a data capture module, wherein the millimeter wave radar is provided with a signal transmitting antenna and a signal receiving antenna; the signal transmitting antenna transmits a linear frequency modulation transmitting signal to the soil surface of the soil container, and the signal receiving antenna acquires a linear frequency modulation reflected signal; the millimeter wave radar combines the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to obtain an orthogonal signal, and carries out frequency conversion processing on the orthogonal signal to obtain an intermediate frequency suppression signal; and the data capturing module is used for merging the intermediate frequency suppression signals to obtain merged data, and performing fast Fourier transform on the merged data to obtain a frequency domain map. The frequency domain map reflects reflected energy information of a soil surface, and soil humidity information of soil in the soil container can be obtained according to the reflected energy information.
The method and the device for detecting the soil humidity solve the problems that when the soil humidity is detected by adopting a frequency domain reflection method, electromagnetic pulses, single frequency signals or multi-frequency signals of a certain specific frequency band are required to be adopted as sweep frequency signals to perform frequency domain reflection detection on the soil, the frequency information of the sweep frequency signals is fixed, the obtained reflection information is not comprehensive enough and diverse, the effect of continuous measurement cannot be achieved, and the detection speed of the soil humidity is low and the detection efficiency is not high.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a soil moisture detection device according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a working flow of a soil moisture detection method according to an embodiment of the present application;
fig. 3 is a schematic diagram illustrating comparison between soil humidity information measured by a millimeter wave radar and soil humidity information measured by a weighing method in the soil humidity detection method according to the embodiment of the present application.
Detailed Description
In order to solve the problems that when a frequency domain reflection method is adopted to detect the soil humidity, electromagnetic pulses of a certain specific frequency band, single frequency signals or multi-frequency signals are required to be adopted as sweep frequency signals to perform frequency domain reflection detection on the soil, the frequency information of the sweep frequency signals is fixed, the obtained reflection information is not comprehensive and diverse enough, the effect of continuous measurement cannot be achieved, the detection speed of the soil humidity is low, and the detection efficiency is not high, the application discloses a soil humidity detection method and a device through the following embodiments.
The first embodiment of the application discloses a soil humidity detection method, soil humidity detection method is applied to a soil humidity detection device, soil humidity detection device includes soil container, millimeter wave radar and data capture module, wherein, the soil container with connect through the fixed bolster between the millimeter wave radar, the millimeter wave radar is pressed close to one side of soil container is equipped with signal transmission antenna and signal reception antenna, the millimeter wave radar reaches connect through the data line between the data capture module, see the work flow schematic diagram that fig. 2 shows, a soil humidity detection method includes:
and step S1, the signal transmitting antenna transmits a linear frequency modulation transmitting signal to the soil surface of the soil container.
It should be noted that, as an example, the millimeter wave radar may be IWR1443 chirp millimeter wave radar of Texas Instruments (TI) corporation, which transmits a chirp transmitting signal to a soil surface and receives a reflected signal, the frequency of the chirp transmitting signal changes linearly with time, the soil container is made of polyethylene plastic or other material transparent to millimeter waves, and the soil in the soil container needs to be dried in advance to ensure that the subsequent water adding process is not affected by the moisture of the soil itself. The data capture module is of a DCA1000EVM model, is connected with the millimeter wave radar through a data connecting line and is used for transmitting data. The signal transmitting antenna is provided with one antenna, noted as TX1, and the signal receiving antenna is provided with four antennas, noted as RX1, RX2, RX3 and RX 4.
And step S2, the signal receiving antenna acquires a linear frequency modulation reflected signal reflected by the soil surface.
And step S3, the millimeter wave radar acquires the chirp transmitting signal and the chirp reflection signal, and combines the chirp transmitting signal and the chirp reflection signal to acquire an orthogonal signal.
It should be noted that a synthesizer is further disposed on a side of the millimeter wave radar close to the soil container, and the synthesizer is configured to acquire the chirp transmitting signal and the chirp reflecting signal, and combine the chirp transmitting signal and the chirp reflecting signal to acquire an orthogonal signal.
And step S4, the millimeter wave radar carries out frequency conversion processing on the orthogonal signal and acquires an intermediate frequency suppression signal.
It should be noted that the millimeter wave radar further includes a mixer, and the quadrature signal enters the mixer to be mixed to obtain an intermediate frequency suppression (IF) signal, which is composed of a real part and an imaginary part.
And step S5, the data capture module performs merging processing on the if suppression signals to obtain merged data.
Further, the data capturing module performs merging processing on the if suppression signals to obtain merged data, including:
the data capture module reads a binary file of the intermediate frequency suppression signal and combines data in the binary file into decimal data.
And the data capturing module is used for combining the real part and the imaginary part of the decimal data to obtain combined data.
It should be noted that the mixed if suppression signals are combined to obtain useful information, and the mixed if suppression signals include all information of the transmission signal and the reflection signal. The if suppression signal can be read from the radar through the data capture module and stored as a binary file (. bin file), the if suppression signal is a 4 × N matrix, the number of rows corresponds to the serial number of the signal receiving antenna, i.e. rows 1,2, 3, 4 represent the data received by RX1, RX2, RX3, RX4, respectively; n depends on the frame number of the transmitted signal, the present technical solution transmits 8 frames of signals, each frame of signals has 128 chirps, one chirp has 256 ADC sample points, each sample point is divided into a real part and an imaginary part, the real part is stored before the imaginary part, and it is known that N is 8 × 128 × 256 × 2 is 524288. The format of the if suppressed signal separates the real and imaginary parts, so i need to combine the real and imaginary parts of the if suppressed signal after reading to obtain a 4 × 262144 matrix.
The matlab code for combining the if suppressed signals is as follows:
and step S6, the data capturing module performs fast Fourier transform on the merged data to obtain a frequency domain map.
Further, the data capturing module performs fast fourier transform on the merged data to obtain a frequency domain map, including:
the data capture module averages the merged data and obtains a 4 x 256 matrix.
The data capture module converts the one 4 x 256 matrix into 4 1 x 256 matrices.
And the data capturing module performs 256-point fast Fourier transformation on the 4 matrices of 1 x 256 to obtain a frequency domain map.
It should be noted that, the merged data is used for fourier transform and the frequency domain map is used to obtain energy information, the merged data is a complex matrix with a size of 4 × 262144, and one chirp signal is 256 sample points, so the merged data is firstly averaged, so that the information of all chirp signals can be included, that is, 1024 chirp signals are averaged to obtain a 4 × 256 matrix, and then the data of four channels are respectively obtained, that is, 4 matrices with 1 × 256.
Here we perform fourier transform on the 4 matrices of 1 × 256 and obtain the frequency domain map, using the following mathematical formula:
wherein, N represents the number of points obtained by sampling the ADC, that is, 256, N represents any one of the number of points obtained by sampling the ADC, and the value is [ 1,256 ], schRepresenting a matrix, and the corner mark represents the serial number of a channel, and since we can not completely represent pi, we take 3.14, so that P (w) is represented as a matrix from 1 to 6281, but w in the index needs to be divided into a form of pi.
And step S7, the data capture module acquires the reflected energy information of the soil surface according to the frequency domain map.
It should be noted that after the frequency domain map is drawn, the reflected energy information can be obtained by comparing the frequency domain map. The frequency domain map definition shows that the total power of the signal is obtained after the frequency domain map is integrated, so that the reflection energy information required by the user can be obtained by multiplying N after the matrix is accumulated, namely N, and the code can be expressed as N Sum (P).
And step S8, the data capturing module acquires soil humidity information of the soil in the soil container according to the reflected energy information.
Further, the data capturing module obtains soil humidity information of soil in the soil container according to the reflected energy information, and includes:
and the data capturing module acquires the dielectric constant of the soil in the soil container according to the reflected energy information.
And the data capturing module acquires soil humidity information of the soil in the soil container according to the dielectric constant of the soil in the soil container.
The disclosure of the above embodiments is explained below by way of a simple example:
before carrying out soil moisture detection, need debug earlier the millimeter wave radar ensures the millimeter wave radar normal work back, we can detect through the experiment soil moisture detection device's feasibility and reliability, the experiment can divide into following part:
(1) the parameters used in the experiment are set, the millimeter wave radar in the experiment transmits 8 frames of signals, each frame of signal comprises 128 linear frequency modulation signals, the change rate of the frequency modulation signals is set to be 30MHz/us, and the frequency band is 76GHz-81 GHz.
(2) And adding dry soil with fixed weight into the soil container, measuring soil humidity information of the dry soil by using a millimeter wave radar, then adding about 10g of water each time, and measuring the soil humidity information of the soil after adding water each time by using the millimeter wave radar. Meanwhile, soil humidity information under the same experimental conditions is measured by a weighing method, namely, the initial weight of dry soil is measured firstly, then the weight of the dry soil after 10g of water is added every time is measured, and the standard soil humidity information can be obtained by calculating the water weight/the weight of the dry soil after the water is added.
(3) And comparing the soil humidity information measured by the millimeter wave radar every time with the standard soil humidity information obtained by adopting a weighing method every time, and obtaining a comparison result.
Fig. 3 shows the comparison result between the soil humidity information measured by the millimeter wave radar and the soil humidity information measured by the weighing method, and the correlation between the soil humidity information measured by the millimeter wave radar and the soil humidity information measured by the weighing method shows the accuracy of the measurement in the technical scheme.
The abscissa is the standard soil humidity measured by the weighing method, and the ordinate represents the reflected energy/reflected energy (dry soil), that is, the soil humidity information measured by the millimeter wave radar is normalized, so when the soil humidity is 0, the ordinate is 1. The round points are soil humidity information measured by soil humidity information under standard soil humidity, the inclined lines are first-order fitting function curves of the data, the obtained fitting curves are y-0.0295 x +0.9814, and the correlation coefficient between x and y is 0.9334.
The following are embodiments of the apparatus disclosed in the present application, for performing the above embodiments of the method, and for details not disclosed in the embodiments of the apparatus, please refer to the embodiments of the method.
The second embodiment of the present application discloses a soil humidity detection device, which is applied to a soil humidity detection method disclosed in the first embodiment of the present application, and referring to the schematic structural diagram shown in fig. 1, the soil humidity detection device comprises: soil container, millimeter wave radar and data capture module, the soil container with connect through the fixed bolster between the millimeter wave radar, the millimeter wave radar is pressed close to one side of soil container is equipped with signal transmission antenna and signal reception antenna, the millimeter wave radar reaches connect through the data line between the data capture module.
Wherein the signal transmitting antenna comprises:
and the signal transmitting module is used for transmitting a linear frequency modulation transmitting signal to the soil surface of the soil container.
The signal receiving antenna includes:
and the signal reflection module is used for acquiring the linear frequency modulation reflection signal reflected by the soil surface.
The millimeter wave radar includes:
and the orthogonal signal acquisition module is used for acquiring the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal, and combining the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to acquire an orthogonal signal.
And the intermediate frequency suppression signal acquisition module is used for carrying out frequency conversion processing on the orthogonal signal and acquiring an intermediate frequency suppression signal.
The data capture module includes:
and the data merging module is used for merging the intermediate frequency suppression signals to acquire merged data.
And the frequency domain map acquisition module is used for performing fast Fourier transform on the combined data to acquire a frequency domain map.
And the reflected energy information acquisition module is used for acquiring the reflected energy information of the soil surface according to the frequency domain map.
And the soil humidity information acquisition module is used for acquiring the soil humidity information of the soil in the soil container according to the reflected energy information.
Further, the data merging module includes:
and the data combination unit is used for reading the binary file of the intermediate frequency suppression signal by the data capture module and combining the data in the binary file into decimal data.
And the data merging unit is used for merging the real part and the imaginary part of the decimal data by the data capturing module to obtain merged data.
Further, the frequency domain map obtaining module includes:
and the first matrix acquisition unit is used for averaging the merged data to acquire a 4 x 256 matrix.
And a second matrix obtaining unit, configured to convert the one 4 × 256 matrix into 4 1 × 256 matrices.
And the frequency domain map obtaining unit is used for carrying out 256-point fast Fourier change on the 4 matrices of 1 x 256 to obtain a frequency domain map.
Further, the soil humidity information acquisition module includes:
and the dielectric constant acquisition unit is used for acquiring the dielectric constant of the soil in the soil container according to the reflected energy information.
And the soil humidity information acquisition unit is used for acquiring the soil humidity information of the soil in the soil container according to the dielectric constant of the soil in the soil container.
Furthermore, a synthesizer and a mixer are further arranged on one side of the millimeter wave radar close to the soil container.
The synthesizer is used for acquiring the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal, and combining the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to acquire an orthogonal signal.
The frequency mixer is used for carrying out frequency conversion processing on the orthogonal signals and acquiring intermediate frequency suppression signals.
Furthermore, there are one signal transmitting antenna and four signal receiving antennas.
The application discloses a soil humidity detection method and a device, comprising the following steps: the system comprises a soil container, a millimeter wave radar and a data capture module, wherein the millimeter wave radar is provided with a signal transmitting antenna and a signal receiving antenna; the signal transmitting antenna transmits a linear frequency modulation transmitting signal to the soil surface of the soil container, and the signal receiving antenna acquires a linear frequency modulation reflected signal; the millimeter wave radar combines the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to obtain an orthogonal signal, and carries out frequency conversion processing on the orthogonal signal to obtain an intermediate frequency suppression signal; and the data capturing module is used for merging the intermediate frequency suppression signals to obtain merged data, and performing fast Fourier transform on the merged data to obtain a frequency domain map. The frequency domain map reflects reflected energy information of a soil surface, and soil humidity information of soil in the soil container can be obtained according to the reflected energy information.
The method and the device for detecting the soil humidity solve the problems that when the soil humidity is detected by adopting a frequency domain reflection method, electromagnetic pulses, single frequency signals or multi-frequency signals of a certain specific frequency band are required to be adopted as sweep frequency signals to perform frequency domain reflection detection on the soil, the frequency information of the sweep frequency signals is fixed, the obtained reflection information is not comprehensive enough and diverse, the effect of continuous measurement cannot be achieved, and the detection speed of the soil humidity is low and the detection efficiency is not high.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (10)
1. The soil humidity detection method is applied to a soil humidity detection device, the soil humidity detection device comprises a soil container, a millimeter wave radar and a data capture module, wherein the soil container is connected with the millimeter wave radar through a fixed support, a signal transmitting antenna and a signal receiving antenna are arranged on one side, close to the soil container, of the millimeter wave radar, the millimeter wave radar is connected with the data capture module through a data line, and the soil humidity detection method comprises the following steps:
the signal transmitting antenna transmits a linear frequency modulation transmitting signal to the soil surface of the soil container;
the signal receiving antenna acquires a linear frequency modulation reflected signal reflected by the soil surface;
the millimeter wave radar acquires the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal, and combines the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to acquire an orthogonal signal;
the millimeter wave radar carries out frequency conversion processing on the orthogonal signal and obtains an intermediate frequency suppression signal;
the data capture module is used for merging the intermediate frequency suppression signals to obtain merged data;
the data capturing module performs fast Fourier transform on the merged data to acquire a frequency domain map;
the data capturing module acquires the reflected energy information of the soil surface according to the frequency domain map;
and the data capturing module acquires soil humidity information of the soil in the soil container according to the reflected energy information.
2. The soil moisture detection method of claim 1, wherein the data capturing module combines the if suppression signals to obtain combined data, and the method comprises:
the data capture module reads a binary file of the intermediate frequency suppression signal and combines data in the binary file into decimal data;
and the data capturing module is used for combining the real part and the imaginary part of the decimal data to obtain combined data.
3. The soil moisture detection method of claim 1, wherein said data capturing module performs fast fourier transform on said merged data to obtain a frequency domain map, comprising:
the data capture module averages the merged data and obtains a 4 x 256 matrix;
the data capture module converts the one 4 x 256 matrix into 4 1 x 256 matrices;
and the data capturing module performs 256-point fast Fourier transformation on the 4 matrices of 1 x 256 to obtain a frequency domain map.
4. The method of claim 1, wherein the data capturing module obtains soil moisture information of the soil in the soil container according to the reflected energy information, and comprises:
the data capturing module acquires the dielectric constant of the soil in the soil container according to the reflected energy information;
and the data capturing module acquires soil humidity information of the soil in the soil container according to the dielectric constant of the soil in the soil container.
5. A soil moisture detecting apparatus, wherein said soil moisture detecting apparatus is applied to a soil moisture detecting method according to any one of claims 1 to 4, said soil moisture detecting apparatus comprising: the device comprises a soil container, a millimeter wave radar and a data capture module, wherein the soil container is connected with the millimeter wave radar through a fixed support, a signal transmitting antenna and a signal receiving antenna are arranged on one side, close to the soil container, of the millimeter wave radar, and the millimeter wave radar is connected with the data capture module through a data line;
wherein the signal transmitting antenna comprises:
the signal transmitting module is used for transmitting a linear frequency modulation transmitting signal to the soil surface of the soil container;
the signal receiving antenna includes:
the signal reflection module is used for acquiring a linear frequency modulation reflection signal reflected by the soil surface;
the millimeter wave radar includes:
the orthogonal signal acquisition module is used for acquiring the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal, and combining the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to acquire an orthogonal signal;
the intermediate frequency suppression signal acquisition module is used for carrying out frequency conversion processing on the orthogonal signal and acquiring an intermediate frequency suppression signal;
the data capture module includes:
the data merging module is used for merging the intermediate frequency suppression signals to acquire merged data;
the frequency domain map acquisition module is used for performing fast Fourier transform on the combined data to acquire a frequency domain map;
the reflected energy information acquisition module is used for acquiring the reflected energy information of the soil surface according to the frequency domain map;
and the soil humidity information acquisition module is used for acquiring the soil humidity information of the soil in the soil container according to the reflected energy information.
6. The soil moisture detection device of claim 5, wherein the data consolidation module comprises:
the data combination unit is used for reading the binary file of the intermediate frequency suppression signal by the data capture module and combining the data in the binary file into decimal data;
and the data merging unit is used for merging the real part and the imaginary part of the decimal data by the data capturing module to obtain merged data.
7. The soil moisture detection device of claim 5, wherein the frequency domain map acquisition module comprises:
a first matrix obtaining unit, configured to average the merged data to obtain a 4 × 256 matrix;
a second matrix obtaining unit, configured to convert the one 4 × 256 matrix into 4 1 × 256 matrices;
and the frequency domain map obtaining unit is used for carrying out 256-point fast Fourier change on the 4 matrices of 1 x 256 to obtain a frequency domain map.
8. The soil moisture detecting apparatus according to claim 5, wherein the soil moisture information acquiring module comprises:
the dielectric constant acquisition unit is used for acquiring the dielectric constant of the soil in the soil container according to the reflected energy information;
and the soil humidity information acquisition unit is used for acquiring the soil humidity information of the soil in the soil container according to the dielectric constant of the soil in the soil container.
9. The soil moisture detection device of claim 5, wherein a synthesizer and a mixer are further provided on a side of said millimeter wave radar proximate to said soil container;
the synthesizer is used for acquiring the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal, and combining the linear frequency modulation transmitting signal and the linear frequency modulation reflecting signal to acquire an orthogonal signal;
the frequency mixer is used for carrying out frequency conversion processing on the orthogonal signals and acquiring intermediate frequency suppression signals.
10. A soil moisture detecting device as claimed in claim 5, wherein there is one signal transmitting antenna and four signal receiving antennas.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932393A (en) * | 2021-10-12 | 2022-01-14 | 青岛海尔空调器有限总公司 | Method and device for controlling air conditioner, air conditioner and storage medium |
| CN114184645A (en) * | 2021-12-30 | 2022-03-15 | 南京楚航科技有限公司 | Diaper humidity detection alarm device based on millimeter wave radar |
| CN114935373A (en) * | 2022-07-25 | 2022-08-23 | 南京大学 | Bridge expansion joint disease data simulation collection system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1156589A (en) * | 1966-11-22 | 1969-07-02 | Hollandse Signaalapparaten Bv | Improvements in or relating to Monopulse Radar Apparatus |
| CN102735697A (en) * | 2011-04-07 | 2012-10-17 | 中国科学院电子学研究所 | Method and apparatus for detecting deep soil humidity through microwave remote sensing |
| US20190316951A1 (en) * | 2018-04-11 | 2019-10-17 | Lasso Technologies, LLC | Tank Multi-Level Measurement Using Through the Air Millimeter Wave Radar |
| CN111337549A (en) * | 2020-03-13 | 2020-06-26 | 山东航向电子科技有限公司 | GPS multi-satellite fusion soil humidity monitoring method based on fuzzy entropy |
-
2021
- 2021-06-24 CN CN202110705820.0A patent/CN113376184B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1156589A (en) * | 1966-11-22 | 1969-07-02 | Hollandse Signaalapparaten Bv | Improvements in or relating to Monopulse Radar Apparatus |
| CN102735697A (en) * | 2011-04-07 | 2012-10-17 | 中国科学院电子学研究所 | Method and apparatus for detecting deep soil humidity through microwave remote sensing |
| US20190316951A1 (en) * | 2018-04-11 | 2019-10-17 | Lasso Technologies, LLC | Tank Multi-Level Measurement Using Through the Air Millimeter Wave Radar |
| CN111337549A (en) * | 2020-03-13 | 2020-06-26 | 山东航向电子科技有限公司 | GPS multi-satellite fusion soil humidity monitoring method based on fuzzy entropy |
Non-Patent Citations (4)
| Title |
|---|
| NESSRINE ZEMNI等: "Laboratory Calibration and Field Validation of Soil Water Content and Salinity Measurements Using the 5TE Sensor", 《SENSORS》 * |
| 康学远等: "土壤介电常数-含水量关系模型研究", 《中国农村水利水电》 * |
| 未元等: "频率步进雷达信号处理与系统仿真", 《计算机应用》 * |
| 窦林涛等: "基于Matlab的雷达信号处理系统仿真", 《指挥控制与仿真》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932393A (en) * | 2021-10-12 | 2022-01-14 | 青岛海尔空调器有限总公司 | Method and device for controlling air conditioner, air conditioner and storage medium |
| CN113932393B (en) * | 2021-10-12 | 2023-03-21 | 青岛海尔空调器有限总公司 | Method and device for controlling air conditioner, air conditioner and storage medium |
| CN114184645A (en) * | 2021-12-30 | 2022-03-15 | 南京楚航科技有限公司 | Diaper humidity detection alarm device based on millimeter wave radar |
| CN114935373A (en) * | 2022-07-25 | 2022-08-23 | 南京大学 | Bridge expansion joint disease data simulation collection system |
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