CN106053330B - Soil density and moisture combined measurement method and device - Google Patents

Abstract

The present invention relates to a kind of soil density and moisture combined measurement methods and device, wherein this method comprises: obtaining probe in the acceleration and pressure being inserted into soil course to be measured；Denoising is carried out to acceleration and pressure；To Jing Guo denoising acceleration and pressure analyze, to determine the degree of packing measurement result of soil；Based on the volumetric soil water content model under the standard degree of packing, according to degree of packing measurement result, volumetric water content soil moisture to be measured being scaled in the case of the standard soil degree of packing.The present invention has more universality for the measurement of soil density, the measurement error that can be avoided non-be at the uniform velocity inserted into due to probe and generate, measurement Soil compaction that can be more accurate, the error that can be measured to avoid the volumetric soil water content as caused by Soil compaction difference, and then more accurate measurement volumetric soil water content, and then lay the foundation for agricultural production, stand tending and the research of ECOLOGICAL ENVIRONMENTAL MONITORING.

Description

Soil compactness and moisture compound measurement method and device

technical field

The invention relates to the field of soil detection in forest areas, in particular to a method and device for compound measurement of soil compactness and moisture.

Background technique

Soil has become the basis of agricultural and forestry production because of its fertility and the ability to grow green plants. The compactness and moisture content in the soil directly affect the growth and development of plants. Soil compactness is an important parameter in soil structure, which is composed of soil shear force, compression force and friction force. Natural factors such as floods and droughts, as well as human factors such as heavy machinery and other farming practices will change the soil compaction, thereby affecting the conditions of water, fertilizer, gas and heat in the soil environment on which plants depend, which in turn will affect the growth of plants and the health of crops. Yield. Soil compactness can affect the growth of crop roots and can be used to evaluate soil tillability. Soil that is too compact will prevent water infiltration, affect the growth of plant roots, reduce the utilization rate of chemical fertilizers, and result in reduced crop yields. Soil water content has an important influence on the growth and development of plants and soil compactness. Too much or too little soil water content will cause stress to the normal growth of plants.

However, the accumulation and decay of fallen leaves in the forest all year round, coupled with the complex and diverse ecosystems in the forest, lead to complex soil composition in the forest area. In the prior art, in the process of measuring soil compactness in forest areas, when the measuring probe is inserted into the soil, it often causes large errors in the measurement results due to non-uniform insertion. The American Society of Agricultural Engineers (ASAE) stipulates that the speed of probe insertion during compactness measurement is 0.03m/s, and the pressure measured at this time can be used to characterize soil compactness.

Since the probe insertion is a fast process, it is difficult for the hand-held soil compactness meter to accurately guarantee this speed in actual use, so part of the downward force on the measured probe is used to generate acceleration, so based on this method The measurement will have a large error. Furthermore, the previous measurement of soil volumetric moisture content did not consider the impact of soil compaction. However, in fact, the volumetric moisture content of soil is closely related to the degree of compaction of soil. The increase of soil compaction will lead to The soil density increases, which in turn causes changes in the moisture content of the unit soil. Therefore, there is actually a large error in directly measuring the volumetric moisture content of the soil without considering the compactness of the soil.

Contents of the invention

For the existing soil compactness meter, it is difficult to accurately ensure the speed of probe insertion in actual use, which leads to large measurement errors and the existing soil moisture content measurement process ignores the influence of soil compaction. Cause the defective of soil volume moisture content measurement error, the present invention proposes following technical scheme:

A method for measuring soil compactness and water content, comprising:

Obtain the acceleration and pressure of the probe when it is inserted into the soil to be tested;

performing denoising processing on the acceleration and the pressure;

Analyzing the denoised acceleration and the pressure based on Newton's second law and the two-force balance method, so as to determine the compactness measurement result of the soil to be tested according to the analysis result;

Obtaining the moisture content of the probe inserted into the soil to be tested;

Based on the soil volume moisture content model under the standard compactness, the water content of the soil to be tested is converted into the volume moisture content under standard conditions according to the compactness measurement results.

Optionally, the acquisition of the acceleration and pressure of the probe in the process of being inserted into the soil to be measured includes:

During the process of inserting the probe into the soil to be tested, the acceleration of the probe is measured at intervals with a preset frequency, so as to obtain acceleration discrete values reflecting changes in the acceleration of the probe;

The pressure on the probe is measured at intervals with a preset frequency, so as to obtain pressure discrete values reflecting pressure changes of the probe.

Optionally, the denoising processing on the acceleration and the pressure includes:

Denoising processing is performed on the acceleration and the pressure by using a limiting average filtering method, so as to eliminate deviations in sampling values.

Optionally, the denoised acceleration and the pressure are analyzed based on Newton's second law and the two-force balance method, so as to determine the compactness of the soil to be tested according to the analysis results Measurement results, including:

Based on Newton's second law, determine the value of the force used to generate the acceleration according to the denoised value of the acceleration and the pre-measured mass of the probe;

Based on the two-force balance method, according to the denoised value of the pressure and the value of the force used to generate the acceleration, the non-uniform velocity process of inserting the probe into the soil to be measured is equivalent to a uniform velocity In the process, the effective compaction strength of the soil to be tested is determined by a discrete integration algorithm, so that the effective compaction strength is used as the compactness measurement result of the soil to be tested.

Optionally, the obtaining the moisture of the probe inserted into the soil to be tested includes:

Based on the standing wave ratio method, a 100M signal source and a coaxial transmission line with fixed impedance are used to process the voltage signal obtained by the measurement of the bimetallic ring electrode to obtain an analog voltage signal corresponding to the moisture content of the soil to be measured, so as to convert the The analog voltage signal is used as the moisture measurement result of the soil to be tested.

Optionally, the soil volume moisture content model based on the standard compactness is combined with the above-mentioned measured soil compaction to convert the soil moisture into the volume moisture content under standard conditions, including:

Processing and analyzing the moisture measurement results of the soil to be tested to obtain the volume moisture content of the soil to be tested;

Substituting the compactness measurement result and the moisture measurement result into a relationship model between soil compaction and volumetric water content to obtain the soil volumetric moisture content under standard soil compaction.

A soil compactness and moisture composite measuring device, comprising:

an acceleration and pressure acquisition unit, configured to acquire the acceleration and pressure of the probe when it is inserted into the soil to be measured;

a denoising unit, configured to denoise the acceleration and the pressure;

The compactness measurement unit is used to analyze the denoised acceleration and the pressure based on Newton's second law and the two-force balance method, so as to determine the compactness of the soil to be tested according to the analysis results. Solidity measurement results;

a moisture acquisition unit, configured to acquire the moisture in which the probe is inserted into the soil to be tested;

The volumetric moisture content measurement unit is configured to convert the moisture of the soil to be measured into the volumetric moisture content under standard conditions based on the compactness measurement result based on the soil volumetric moisture content model under standard compactness.

Optionally, the acceleration and pressure acquisition unit is further used for:

During the process of inserting the probe into the soil to be tested, the acceleration of the probe is measured at intervals with a preset frequency, so as to obtain discrete values of acceleration reflecting changes in the acceleration of the probe; and,

During the process of inserting the probe into the soil to be tested, the pressure on the probe is measured at intervals with a preset frequency, so as to obtain pressure discrete values reflecting pressure changes of the probe.

Optionally, the denoising unit is further used for:

Denoising processing is performed on the acceleration and the pressure by using a limiting average filtering method, so as to eliminate deviations in sampling values.

Optionally, the compactness measuring unit is further used for:

Based on Newton's second law, determine the value of the force used to generate the acceleration according to the denoised value of the acceleration and the pre-measured mass of the probe;

Based on the two-force balance method, according to the denoised value of the pressure and the value of the force used to generate the acceleration, the non-uniform velocity process of inserting the probe into the soil to be measured is equivalent to a uniform velocity In the process, the effective compaction strength of the soil to be tested is determined by a discrete integration algorithm, so that the effective compaction strength is used as the compactness measurement result of the soil to be tested.

Optionally, the moisture acquisition unit is further used for:

Based on the standing wave ratio method, a 100M signal source and a coaxial transmission line with fixed impedance are used to process the voltage signal obtained by the measurement of the bimetallic ring electrode to obtain an analog voltage signal corresponding to the moisture content of the soil to be measured, so as to convert the The analog voltage signal is used as the moisture measurement result of the soil to be tested.

Optionally, the volumetric water content measuring unit is further used for:

Processing and analyzing the moisture measurement results of the soil to be tested to obtain the volumetric moisture content of the soil to be tested; and,

Substituting the compactness measurement result and the moisture measurement result into a relationship model between soil compaction and volumetric water content to obtain the soil volumetric moisture content under standard soil compaction.

Compared with the soil compaction and moisture composite measurement method in the prior art, the soil compactness and moisture compound measurement method and device provided by the present invention are more universal for the measurement of soil compaction, and can avoid the The measurement error caused by the non-uniform insertion of the needle can more accurately measure the degree of soil compaction, and the soil volume moisture content under the standard compactness can be converted through the model of soil compaction and volume water content, which can avoid the soil compaction caused by soil compaction. The error in the measurement of soil volumetric moisture content caused by different degrees of solidification can be measured more accurately, and the foundation for the research of agricultural production, forest tending and ecological environment monitoring can be laid.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic flow sheet of the soil compactness of an embodiment of the present invention and the composite measurement method of moisture;

Fig. 2 is a schematic flow chart of denoising processing in the soil compactness and water composite measurement method of an embodiment of the present invention;

Fig. 3 is the schematic flow sheet of carrying out equivalent uniform velocity processing in the soil compactness and moisture composite measurement method of an embodiment of the present invention;

Fig. 4 is a schematic structural view of a soil compactness and moisture compound measuring device according to an embodiment of the present invention;

Fig. 5 is a structural schematic diagram of a soil compaction and moisture composite measurement system according to an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Fig. 1 is the schematic flow sheet of the soil compactness of an embodiment of the present invention and the composite measuring method of moisture; As shown in Fig. 1, the method comprises:

S1: Obtain the acceleration and pressure of the probe when it is inserted into the soil to be tested;

S2: Perform denoising processing on the acceleration and the pressure;

S3: Based on Newton's second law and the two-force balance method, analyze the denoised acceleration and the pressure, so as to determine the compactness measurement result of the soil to be tested according to the analysis result;

S4: Obtain the moisture content of the probe inserted into the soil to be tested;

S5: Based on the soil volume moisture content model under standard compactness, convert the water content of the soil to be tested into the volume moisture content under standard conditions according to the compactness measurement results.

Compared with the soil compaction and moisture composite measurement method of the prior art, the soil compactness and moisture compound measurement method of this embodiment is more universal for the measurement of soil compaction, and can avoid the The measurement error caused by non-uniform insertion can more accurately measure the degree of soil compaction. The soil volumetric moisture content under the standard compaction degree can be converted through the model of soil compaction degree and volumetric moisture content, which can avoid the soil compaction degree The error in the measurement of soil volumetric moisture content caused by different factors, and then more accurate measurement of soil volumetric moisture content, and then lay the foundation for the research of agricultural production, forest tending and ecological environment monitoring.

As a preference of this embodiment, obtaining the acceleration and pressure of the probe in the process of inserting the probe into the soil to be tested in step S1 may further include:

S11: During the process of inserting the probe into the soil to be tested, measure the acceleration of the probe at intervals with a preset frequency, so as to obtain acceleration discrete values reflecting changes in the acceleration of the probe;

S12: Measure the pressure on the probe at intervals with a preset frequency, so as to obtain a discrete pressure value reflecting the pressure change of the probe.

As a preference of this embodiment, performing denoising processing on the acceleration and the pressure in step S2 may further include:

Denoising processing is performed on the acceleration and the pressure by using a limiting average filtering method, so as to eliminate deviations in sampling values.

Specifically, FIG. 2 shows the flow of denoising processing in the composite measurement method of soil compactness and water content according to an embodiment of the present invention. As shown in Figure 2, using the limiting average filter method, the continuous N sampling values are regarded as a queue length fixed at N, each time a new data is sampled and placed at the end of the queue, and the maximum deviation allowed by the two samplings is determined (Set to A), if the difference between the current value and the previous value is less than or equal to A, the current value is valid, if the difference between the current value and the previous value is greater than A, the current value is invalid, and the current value is discarded. Replace the current value with the previous value, and throw away the first sampling data of the queue, perform arithmetic mean operation on the N data in the queue, and get a new filtering result N worth selecting, and use the limiting average filtering method to deal with the occasional Pulse interference can eliminate the sampling value deviation caused by pulse interference.

There are several methods for discrete signal denoising:

Average value filtering is a typical linear filtering method, which focuses on this sampling period. In a sampling period, the signal is sampled m times, and its arithmetic mean value is taken as the filter output in this sampling period. Average value filtering has a good suppression effect on periodic interference signals, but it will produce a certain delay, which is proportional to the number of sampling times m required for filtering. The value of m depends on the requirements for smoothness and sensitivity. As m increases, smoothness increases and sensitivity decreases.

Median filtering is a typical nonlinear filtering method. In order to filter out occasional pulse interference, median filtering is often used. The median filter sorts the m consecutive sampling values of the signal, and takes the median value as the filter output in this sampling period. The larger m is, the better the filtering effect will be, but the delay will increase. The median filter has a good filtering effect on the pulse interference of the slowly changing process.

The Vienna filter is an adaptive filter whose basic idea is that under certain constraints, the minimum of the square of the difference between the signal output and a desired output is the optimal criterion. Wiener filtering has a wide range of applications, and it can be applied no matter whether the stationary random process is continuous or discrete, scalar or vector. However, it cannot be used in the case of a non-stationary random process with noise, and it is not convenient to apply to the vector case. Therefore, Wiener filtering is rarely used in practical problems.

Wavelet denoising has good localization characteristics in both time domain and frequency domain. The wavelet coefficient of the signal increases with the increase of the scale, and the wavelet transform coefficient of the noise decreases with the increase of the scale. Therefore, a threshold can be set, and the threshold can be adjusted according to a certain rule by using the threshold. The wavelet coefficients at all levels after threshold adjustment are reconstructed to obtain the denoised signal. Due to the randomness of the noise signal intensity and the different propagation characteristics of the signal and noise in the process of wavelet decomposition, the threshold value adopted by each layer of wavelet decomposition coefficients should change with the change of wavelet coefficients. Therefore, the selection of the threshold is the key to the denoising effect.

Since the above-mentioned existing sampling and denoising methods all have shortcomings such as slow speed and great influence on threshold selection, the limiting average filtering method is adopted in combination with the characteristics of soil compactness and moisture composite measurement.

Fig. 3 is the schematic flow chart of carrying out equivalent constant speed processing in the soil compactness of an embodiment of the present invention and moisture compound measuring method; The two-force balance method, analyzing the denoised acceleration and the pressure, to determine the compactness measurement result of the soil to be tested according to the analysis result, may further include:

S31: Based on Newton's second law, determine the value of the force used to generate the acceleration according to the denoised value of the acceleration and the pre-measured mass of the probe;

S32: Based on the two-force balance method, according to the denoised value of the pressure and the value of the force used to generate the acceleration, the non-uniform process of inserting the probe into the soil to be measured is equivalent to For a uniform process, the effective compaction strength of the soil to be tested is determined by a discrete integration algorithm, so that the effective compaction strength is used as the compactness measurement result of the soil to be tested.

Specifically, based on the two-force balance method, the downward force F applied by the probe during insertion is greater than the reaction force Fn exerted by the soil on the probe, thereby resulting in an acceleration a. The downward force F includes The pressure F1 on the surface and the gravity G of the probe, and the force Fn reflects the compactness of the soil. From the two-force balance method, it can be known that the resultant force F of the forces F1 and G, one part is used to offset the reaction force Fn, and the other part is used to generate Acceleration a, the mass of the probe is m, then the force that produces the acceleration is Fa=m*a, then Fn=F1-Fa+G; from the two-force balance method, if the probe enters the soil in a uniform linear motion, the probe When the downward force Fx is received during the insertion process, the reaction force exerted by the soil on the probe is N=G+Fx, because the soil compactness at the same point remains unchanged, so N=Fn, then there is Fx=F1-Fa, Therefore, the force Fx can be calculated by measuring the pressure F and acceleration a applied to the probe, and then the process of inserting the probe into the soil is equivalent to a uniform process. Because when the probe is inserted into the soil at a constant speed, the reaction force of different sizes on the probe due to the different compactness of the soil is N, N=Fn, so Fx can be calculated by F1 and a, and then N (ie Fn), Fn The magnitude of the value reflects the degree of compaction of the soil, and the effective compaction force Fs of the soil is obtained by discrete integral processing of Fn, so as to realize the measurement and quantification of the degree of soil compaction.

The method for measuring soil compactness in this embodiment, by inserting the probe into the soil, the non-uniform velocity process is equivalent to a uniform velocity process, and then realizes the measurement of soil compactness. Compared with the prior art method, the soil compactness The universality of the measurement is higher, which can effectively avoid the measurement error caused by the non-uniform insertion of the probe due to the complex soil composition in the forest area, and the accuracy of measuring the degree of soil compaction is higher. The soil volume moisture content under the standard compactness can be converted through the model of soil compaction and volumetric moisture content, which can avoid the measurement error of soil volumetric moisture content caused by different degrees of soil compaction, and then measure the soil volumetric moisture content more accurately Rate.

Fig. 4 is the structural representation of the soil compactness and moisture compound measuring device of an embodiment of the present invention; As shown in Fig. 4, this device comprises acceleration and pressure acquisition unit 10, denoising unit 20, compactness measuring unit 30, Moisture acquisition unit 40 and volumetric moisture content measurement unit 50;

Wherein, the acceleration and pressure acquisition unit 10 is used to acquire the acceleration and the pressure of the probe when it is inserted into the soil to be measured;

The denoising unit 20 is used for denoising the acceleration and the pressure;

The compactness measurement unit 30 is used to analyze the denoised acceleration and the pressure based on Newton's second law and the two-force balance method, so as to determine the compactness of the soil to be tested according to the analysis results. Solidity measurement results;

Moisture acquisition unit 40, configured to acquire the moisture of the probe inserted into the soil to be tested;

The volumetric moisture content measurement unit 50 is configured to convert the moisture of the soil to be measured into the volumetric moisture content under standard conditions based on the compactness measurement result based on the soil volumetric moisture content model under standard compactness.

The soil compactness and moisture compound measuring device described in this embodiment can be used to implement the above-mentioned method embodiment, and its principle and technical effect are similar, and will not be repeated here.

As a preference of this embodiment, the acceleration and pressure acquisition unit 10 can be further used for:

During the process of inserting the probe into the soil to be tested, the acceleration of the probe is measured at intervals with a preset frequency, so as to obtain discrete values of acceleration reflecting changes in the acceleration of the probe; and,

During the process of inserting the probe into the soil to be tested, the pressure on the probe is measured at intervals with a preset frequency, so as to obtain pressure discrete values reflecting pressure changes of the probe.

As a preference of this embodiment, the denoising unit 20 can be further used for:

Denoising processing is performed on the acceleration and the pressure by using a limiting average filtering method, so as to eliminate deviations in sampling values.

As a preference of this embodiment, the firmness measurement unit 30 can be further used for:

Based on Newton's second law, determine the value of the force used to generate the acceleration according to the denoised value of the acceleration and the pre-measured mass of the probe;

Based on the two-force balance method, according to the denoised value of the pressure and the value of the force used to generate the acceleration, the non-uniform velocity process of inserting the probe into the soil to be measured is equivalent to a uniform velocity In the process, the effective compaction strength of the soil to be tested is determined by a discrete integration algorithm, so that the effective compaction strength is used as the compactness measurement result of the soil to be tested.

As a preference of this embodiment, the moisture acquisition unit 40 can be further used for:

Based on the standing wave ratio method, a 100M signal source and a coaxial transmission line with fixed impedance are used to process the voltage signal obtained by the measurement of the bimetallic ring electrode to obtain an analog voltage signal corresponding to the moisture content of the soil to be measured, so as to convert the The analog voltage signal is used as the moisture measurement result of the soil to be tested.

As a preference of this embodiment, the volumetric water content measurement unit 50 can be further used for:

Processing and analyzing the moisture measurement results of the soil to be tested to obtain the volumetric moisture content of the soil to be tested; and,

Substituting the compactness measurement result and the moisture measurement result into a relationship model between soil compaction and volumetric water content to obtain the soil volumetric moisture content under standard soil compaction.

The soil compactness and moisture compound measuring device described in this embodiment can be used to implement the above-mentioned method embodiment, and its principle and technical effect are similar, and will not be repeated here.

It should be noted that, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to the part of the description of the method embodiment.

The present invention is described below with a specific embodiment, but the protection scope of the present invention is not limited.

Fig. 5 is a structural schematic diagram of a soil compaction and moisture composite measurement system according to an embodiment of the present invention. As shown in Figure 5, the system includes:

The compactness detection unit 100 is used to use the acceleration module 110 and the pressure module 120 to measure the acceleration signal and pressure signal of the probe when it is inserted into the soil, so as to realize the detection of compactness by using the acceleration and pressure;

A temperature detection unit 200, used to measure the temperature of the soil;

Moisture detection unit 300, used to measure the volumetric moisture content of the soil;

GPS positioning unit 400, used for locating the position information and altitude information of the measured soil compactness;

The liquid crystal display module 500 is used to graphically display the three-dimensional model map of the forest area drawn in combination with temperature, moisture, position and compactness, and to display the relationship model between the compactness and temperature, moisture and position. It is used to display the operation commands of the system;

A serial port download unit 600, used for communicating with the host computer and corresponding data transmission;

The volume moisture content measurement unit 700 is used to combine the soil compactness and soil moisture value, and calculate the soil volume moisture content under the standard soil compaction through the soil compaction and soil volume moisture content model;

The main control processing unit 800 is configured to process and calculate the acquired data, and control data communication and display.

Further, the main control processing unit 800 may also include a denoising unit 810, a calculation unit 820, and a data model unit 830 (not shown in the figure);

Wherein, the denoising unit 810 is configured to perform denoising processing on the measured acceleration signal and pressure signal to remove interference from noise points.

The calculation unit 820 is used to use Newton's second law and the two-force balance method based on the denoised signal, and integrate the acceleration and pressure to equate the probe insertion process into a uniform process, and perform discrete integral calculations to obtain the effective compaction force of the soil. A measure of soil compaction.

The data model unit 830 is used to establish a three-dimensional model in combination with temperature, moisture, location and compactness, and to establish a relationship curve model between compactness and temperature, moisture and location.

The embodiment of the present invention provides an equivalent uniform velocity measurement method and measurement system for soil compaction in forest areas. The non-uniform velocity process of inserting the probe into the soil is equivalent to a uniform velocity process, thereby realizing the measurement of soil compaction. Acceleration and pressure measurement, temperature measurement, moisture measurement, GPS positioning measurement, denoising processing, equivalent uniform velocity processing based on Newton's second law and two-force balance method, discrete integral calculation of effective tight force, and standard conditions The calculation of the soil volumetric moisture content, the establishment of the three-dimensional model and the relationship curve show that compared with the existing technology methods, the measurement of soil compactness is universal, and it can effectively avoid the probe due to the complex soil composition in the forest area. The measurement error caused by the non-uniform speed insertion can more accurately measure the degree of soil compaction; through the model of soil compaction and volumetric water content, the soil volumetric water content under the standard compaction can be converted, which can avoid the soil compaction The errors in the measurement of soil volumetric moisture content caused by different degrees can be measured more accurately, which will lay a foundation for the research of agricultural production, forest tending and ecological environment monitoring.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A kind of soil compactness and moisture compound measuring method, it is characterized in that, comprising: Obtain the acceleration and pressure of the probe when it is inserted into the soil to be tested; performing denoising processing on the acceleration and the pressure; Analyzing the denoised acceleration and the pressure based on Newton's second law and the two-force balance method, so as to determine the compactness measurement result of the soil to be tested according to the analysis result; The probe is inserted into and obtains the moisture content of the soil to be tested; Based on the soil volume moisture content model under the standard compactness, according to the compactness measurement result, the moisture of the soil to be tested is converted into the volume moisture content under standard conditions; The denoising-processed acceleration and pressure are analyzed based on Newton's second law and the two-force balance method, so as to determine the compactness measurement result of the soil to be tested according to the analysis results, including : Based on Newton's second law, determine the value of the force used to generate the acceleration according to the denoised value of the acceleration and the pre-measured mass of the probe; Based on the two-force balance method, according to the denoised value of the pressure and the value of the force used to generate the acceleration, the non-uniform velocity process of inserting the probe into the soil to be measured is equivalent to a uniform velocity In the process, the effective compaction strength of the soil to be tested is determined by a discrete integration algorithm, so that the effective compaction strength is used as the compactness measurement result of the soil to be tested. 2. method according to claim 1, is characterized in that, the acceleration and the pressure that described acquisition probe inserts in the soil process to be measured comprises: During the process of inserting the probe into the soil to be tested, the acceleration of the probe is measured at intervals with a preset frequency, so as to obtain acceleration discrete values reflecting changes in the acceleration of the probe; The pressure on the probe is measured at intervals with a preset frequency, so as to obtain pressure discrete values reflecting pressure changes of the probe. 3. The method according to claim 1, wherein the denoising processing of the acceleration and the pressure comprises: Denoising processing is performed on the acceleration and the pressure by using a limiting average filtering method, so as to eliminate deviations in sampling values. 4. The method according to claim 1, wherein said obtaining the moisture of said probe inserted into the soil to be measured comprises: Based on the standing wave ratio method, a 100M signal source and a coaxial transmission line with fixed impedance are used to process the voltage signal obtained by the measurement of the bimetallic ring electrode to obtain an analog voltage signal corresponding to the moisture content of the soil to be measured, so as to convert the The analog voltage signal is used as the moisture measurement result of the soil to be tested. 5. method according to claim 4, it is characterized in that, described based on the soil volumetric moisture content model under standard compactness, according to described compactness measurement result, the moisture of described soil to be measured is converted into under standard condition The volumetric moisture content, including: Processing and analyzing the moisture measurement results of the soil to be tested to obtain the volume moisture content of the soil to be tested; Substituting the compactness measurement result and the moisture measurement result into a relationship model between soil compaction and volumetric water content to obtain the soil volumetric moisture content under standard soil compaction. 6. A soil compactness and moisture composite measuring device, characterized in that, comprising: an acceleration and pressure acquisition unit, configured to acquire the acceleration and pressure of the probe when it is inserted into the soil to be measured; a denoising unit, configured to denoise the acceleration and the pressure; The compactness measurement unit is used to analyze the denoised acceleration and the pressure based on Newton's second law and the two-force balance method, so as to determine the compactness of the soil to be tested according to the analysis results. Solidity measurement results; a moisture acquisition unit, configured to acquire the moisture of the soil to be tested after the probe is inserted into the soil to be tested; A volumetric moisture content measurement unit, configured to convert the moisture of the soil to be measured into a volumetric moisture content under standard conditions based on the compactness measurement result based on the soil volumetric moisture content model under standard compactness; The compactness measuring unit is further used for: Based on Newton's second law, determine the value of the force used to generate the acceleration according to the denoised value of the acceleration and the pre-measured mass of the probe; Based on the two-force balance method, according to the denoised value of the pressure and the value of the force used to generate the acceleration, the non-uniform velocity process of inserting the probe into the soil to be measured is equivalent to a uniform velocity In the process, the effective compaction strength of the soil to be tested is determined by a discrete integration algorithm, so that the effective compaction strength is used as the compactness measurement result of the soil to be tested. 7. The device according to claim 6, wherein the acceleration and pressure acquisition unit is further used for: During the process of inserting the probe into the soil to be tested, the acceleration of the probe is measured at intervals with a preset frequency, so as to obtain discrete values of acceleration reflecting changes in the acceleration of the probe; and, During the process of inserting the probe into the soil to be tested, the pressure on the probe is measured at intervals with a preset frequency, so as to obtain pressure discrete values reflecting pressure changes of the probe. 8. The device according to claim 6, wherein the denoising unit is further used for: Denoising processing is performed on the acceleration and the pressure by using a limiting average filtering method, so as to eliminate deviations in sampling values. 9. The device according to claim 6, wherein the moisture acquisition unit is further used for: Based on the standing wave ratio method, a 100M signal source and a coaxial transmission line with fixed impedance are used to process the voltage signal obtained by the measurement of the bimetallic ring electrode to obtain an analog voltage signal corresponding to the moisture content of the soil to be measured, so as to convert the The analog voltage signal is used as the moisture measurement result of the soil to be tested. 10. The device according to claim 6, wherein the volumetric water content measuring unit is further used for: Processing and analyzing the moisture measurement results of the soil to be tested to obtain the volumetric moisture content of the soil to be tested; and, Substituting the compactness measurement result and the moisture measurement result into a relationship model between soil compaction and volumetric water content to obtain the soil volumetric moisture content under standard soil compaction.