CN116069043A - Unmanned agricultural machinery operation speed autonomous decision-making method - Google Patents
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Abstract
The invention discloses an autonomous decision-making method for the operation speed of an unmanned agricultural machine, which comprises the following steps: s1, acquiring movement state data of an agricultural machine, screening dependent variables influencing the operation speed of the agricultural machine, and establishing a target operation speed training sample; s2, establishing a Gaussian process regression prediction model of the agricultural machinery target operation speed; s3, training a Gaussian process regression prediction model of the target operation speed; s4, evaluating and checking the regression prediction result of the Gaussian process during training to obtain a training completion prediction model; s5, acquiring an agricultural machinery test data sample, acquiring a corresponding unmanned agricultural machinery prediction speed by adopting a Gaussian process regression prediction model, and taking the average value of the prediction speed as a target decision speed; and S6, automatically adjusting the operation speed of the unmanned agricultural machinery according to the obtained target decision speed. The method of the invention realizes that the unmanned agricultural machinery autonomously decides and adjusts the operation speed according to the fluctuation condition of the farmland topography, and improves the operation efficiency while guaranteeing the operation quality.
Description
Technical Field
The invention belongs to the technical field of intelligent agricultural machinery, and particularly relates to an autonomous decision-making method for the operation speed of an unmanned agricultural machinery.
Background
In a wet and slippery slurry and hard bottom layer uneven farmland environment, the unmanned agricultural machine is easy to cause the reduction of the linear running precision of the agricultural machine, so that the operation effect is reduced. At present, unmanned agricultural machinery usually sets up fixed speed operation by people, or adjusts operation speed by human intervention, and experienced agricultural machinery drivers generally meet uneven farmland areas, generally independently decide to slow down and pass through the hollow areas, so that operation quality is ensured, operation speed is increased in flat areas, and operation efficiency is improved.
The Chinese patent No. 202011598475.7 proposes a method and a system for regulating and controlling the advancing speed of an unmanned agricultural machine, which can automatically regulate and stabilize the operating speed of the agricultural machine by judging the operating load of the agricultural machine; the Chinese patent No. 201811075147.1 proposes an unmanned intelligent control system of agricultural machinery and a control method thereof, and designs a debugging device and a method capable of realizing electric control; however, the inventive solution only achieves the speed-controllable function of the unmanned agricultural machine, which still cannot autonomously decide and adjust the operation speed.
Disclosure of Invention
The invention mainly aims to overcome the defects and shortcomings of the prior art, and provides an autonomous decision-making method for the operation speed of an unmanned agricultural machine.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an autonomous decision-making method for the operation speed of an unmanned agricultural machine comprises the following steps:
s1, acquiring movement state data of an unmanned agricultural machine, screening dependent variables affecting the operation speed of the unmanned agricultural machine, and establishing a target operation speed training sample;
s2, establishing a Gaussian process regression prediction model of the target operation speed of the unmanned agricultural machinery;
s3, training a Gaussian process regression prediction model of the target operation speed;
s4, evaluating and checking Gaussian process regression prediction results during training to obtain a trained Gaussian process regression prediction model;
s5, acquiring an unmanned agricultural machinery test data sample, acquiring a corresponding unmanned agricultural machinery prediction speed by adopting a Gaussian process regression prediction model, and taking the average value of the prediction speeds as a target decision speed;
and S6, automatically adjusting the operation speed of the unmanned agricultural machinery according to the obtained target decision speed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, the unmanned agricultural machine operation speed is predicted by using the information such as elevation difference, roll angle, transverse position deviation, course deviation and the like in the movement process of the agricultural machine, which is acquired by the unmanned agricultural machine pose sensing device, so that the operation speed is independently decided and regulated, and the operation efficiency is improved while the operation quality is ensured; the method has strong adaptability and can effectively improve the intelligent degree and applicability of the unmanned agricultural machinery.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a mapping diagram of a Gaussian process regression prediction model of the present invention;
FIG. 3 is a Gaussian process regression flow of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Examples
As shown in fig. 1, the invention relates to an autonomous decision-making method for the operation speed of an unmanned agricultural machine, which comprises the following steps:
s1, acquiring unmanned agricultural machinery motion state data through an airborne terminal of the unmanned agricultural machinery, screening dependent variables influencing the operation speed of the unmanned agricultural machinery, and establishing a target operation speed training sample; the method comprises the following steps:
the operation speed of the unmanned agricultural machinery is influenced by a plurality of dependent variables, and the Spearman rank correlation coefficient is respectively calculated for each dependent variable by adopting a correlation method:
wherein ,for the rank correlation coefficient,nfor data length +.> and />Original data, respectively-> and />Respectively, the data are arranged in order from small to large;
calculating each dependent variable and speed according to the formula (1)vRank correlation coefficient,/>The larger the absolute value is, the dependent variable affects the speed of the unmanned agricultural machineryvThe more pronounced.
In the embodiment, the target operation speed of the unmanned agricultural machinery is influencedvThe most significant 4 factors: difference of elevationRoll angle->Lateral position deviation->Heading angle->Composing 4-dimensional input vectorsm:
wherein ,is the firstiInput vector->Respectively represent the firstiDifference in elevation of the individual input vectors>Roll angle->Lateral position deviation->Heading angle->;
Collecting a plurality of input vectors and output scalar quantities, and establishing a target operation speed training sample D:
wherein ,is the firstiOutput scalar of the individual samples; />Inputting a matrix formed by vectors for all training samples; />Outputting a scalar-composed matrix for all training samples, wherein the training sample set is noisy and obeys a standard gaussian distribution。
S2, establishing a Gaussian process regression prediction model of the target operation speed of the unmanned agricultural machinery; the method comprises the following steps:
The gaussian process is:
for decision regression of target operation speed, a noise-containing function model is adopted:
wherein ,yin order to observe the value of the value,ffor the function value of the function,is thatxA corresponding true value; />Obeying normal distribution, wherein the average value is 0;
observations ofyIs:
wherein ,、/>、/> and />Are all the covariance matrices of the two images,is->Symmetric positive definite covariance matrix, matrix element +.>Representation-> and />Correlation between; />Is->A unit matrix; /> and />The method comprises the following steps:
the key prediction equation for obtaining Gaussian process regression is obtained by adopting Bayesian theory:
As shown in fig. 2, a gaussian process regression prediction model map is provided.
S3, training a Gaussian process regression prediction model of the target operation speed; as shown in fig. 3, includes:
s31, determining a covariance function; the method comprises the following steps:
the Gaussian process regression prediction model adopts a square index covariance kernel function:
wherein ,、lis a hyper-parameter of kernel function, +.>For the signal variance to be a function of the signal variance,ldescribed are scale parameters of the complexity of the kernel function in the parameter space.
S32, setting initial super parameters and optimizing marginal likelihood super parameters; the method comprises the following steps:
input vector of Gaussian process regression prediction model of unmanned agricultural machinery target operation speedmBy difference in elevationRoll angle->Lateral position deviation->And heading angle->Composition, therefore, for the spatial length scale of equation (17)lThe determination of (1) employs an automatic determination of the correlation, expressed as:
wherein ,respectively represent the height difference +.>Roll angle->Lateral position deviation->And heading angleA length scale of each dimension of (a);
the training process of the Gaussian process regression prediction model is regarded as a problem for solving nonlinear numerical optimization, and super-parameter vectors are defined:
optimizing the super-parameters by adopting a Maximum Likelihood Estimation (MLE) method, wherein the marginal likelihood function is as follows:
likelihood obeys a gaussian distribution:
the method is obtained by a Gaussian process regression prediction model:
equation (22) still obeys the gaussian distribution after the integration operation:
solving the negative logarithm of the formula (20) to obtain a negative log-boundary likelihood (Negative log marginal likelihood, NLML) function:
solving the minimum value of the formula (24) to obtain optimized super-parameters, namely converting training of a Gaussian process regression prediction model into an optimization problem of the formula (24), wherein the objective function is thatLThe optimization objective is to solveLIs the minimum of (2);
the conjugate gradient method is adopted to minimize the partial derivative, so as to obtain the optimal solution of the super parameter, namely, the altitude difference obtained according to the measurement of the unmanned agricultural machineryRoll angle->Lateral position deviation->And heading angle->And predicting the target operation speed to be adjusted through a Gaussian regression process.
S4, evaluating and checking Gaussian process regression prediction results during training to obtain a trained Gaussian process regression prediction model; in this embodiment, the mean absolute error is specifically adopted for the evaluation of the regression prediction result in the gaussian processMAEAnd judging the deviation between the predicted value and the true value of the sample:
wherein , and />Respectively represent the firstiA true value and a predicted value,Nto predict the number of samples;MAEthe smaller the value, the better the model predictive performance;
autoregressive training samples using a trained Gaussian process regression prediction model according to equation (15), and calculating according to equation (26)MAEJudging whether the training is successful or not, and if the training is unsuccessful, returning to the step S3; otherwise, step S5 is entered.
S5, acquiring an unmanned agricultural machinery test data sample, acquiring a corresponding unmanned agricultural machinery prediction speed by adopting a Gaussian process regression prediction model, and taking the average value of the prediction speeds as a target decision speed; the method comprises the following steps:
deploying a trained Gaussian process regression prediction model on an unmanned agricultural machine terminal controller, and acquiring data of the unmanned agricultural machine in a period of time as a test data sampleObtaining a corresponding unmanned agricultural machinery prediction speed by adopting a Gaussian process regression prediction model>With this mean value of the predicted speed +.>Decision speed as target->。
S6, automatically adjusting the operation speed of the unmanned agricultural machinery according to the obtained target decision speed; the method comprises the following steps:
will obtain a target decision speedAn on-board speed controller transmitted to the unmanned agricultural machinery, the speed controller determining a speed according to the current speed and the target>And the difference value is used for automatically adjusting the operation speed of the unmanned agricultural machinery.
It should also be noted that in this specification, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An autonomous decision-making method for the operation speed of an unmanned agricultural machine is characterized by comprising the following steps:
s1, acquiring movement state data of an unmanned agricultural machine, screening dependent variables affecting the operation speed of the unmanned agricultural machine, and establishing a target operation speed training sample;
s2, establishing a Gaussian process regression prediction model of the target operation speed of the unmanned agricultural machinery;
s3, training a Gaussian process regression prediction model of the target operation speed;
s4, evaluating and checking Gaussian process regression prediction results during training to obtain a trained Gaussian process regression prediction model;
s5, acquiring an unmanned agricultural machinery test data sample, acquiring a corresponding unmanned agricultural machinery prediction speed by adopting a Gaussian process regression prediction model, and taking the average value of the prediction speeds as a target decision speed;
and S6, automatically adjusting the operation speed of the unmanned agricultural machinery according to the obtained target decision speed.
2. The autonomous decision making method for the operation speed of the unmanned agricultural machine according to claim 1, wherein in the step S1, the screening of the dependent variables affecting the operation speed of the unmanned agricultural machine is specifically:
the operation speed of the unmanned agricultural machinery is influenced by a plurality of dependent variables, and the Spearman rank correlation coefficient is respectively calculated for each dependent variable by adopting a correlation method:
wherein ,for the rank correlation coefficient,nfor data length +.> and />Original data, respectively-> and />Respectively, the data are arranged in order from small to large;
3. An autonomous decision making method for the operation speed of an unmanned agricultural machine according to claim 2, wherein the operation speed of the unmanned agricultural machine is influenced according to formula (1)vThe most significant 4 factors: difference of elevationRoll angle->Lateral position deviation->Heading angle->Composing 4-dimensional input vectorsm:
wherein ,is the firstiInput vector->Respectively represent the firstiDifference in elevation of the individual input vectors>Roll angle->Lateral position deviation->Heading angle->;
Collecting a plurality of input vectors and output scalar quantities, and establishing a target operation speed training sample D:
4. The autonomous decision making method for the operation speed of the unmanned agricultural machinery according to claim 1, wherein the step S2 is specifically:
The gaussian process is:
for decision regression of target operation speed, a noise-containing function model is adopted:
wherein ,yin order to observe the value of the value,ffor the function value of the function,is thatxA corresponding true value; />Obeying normal distribution, wherein the average value is 0;
observations ofyIs:
wherein ,、/>、/> and />Are all the covariance matrices of the two images,is->Symmetric positive definite covariance matrix, matrix element +.>Representation->Andcorrelation between; />Is->A unit matrix; /> and />The method comprises the following steps:
the key prediction equation for obtaining Gaussian process regression is obtained by adopting Bayesian theory:
5. The autonomous decision making method for the operation speed of the unmanned agricultural machinery according to claim 1, wherein the step S3 is specifically:
s31, determining a covariance function;
s32, setting initial super parameters and optimizing marginal likelihood super parameters.
6. The autonomous decision making method for the operation speed of the unmanned agricultural machinery according to claim 5, wherein the step S31 is specifically:
the Gaussian process regression prediction model adopts a square index covariance kernel function:
7. The autonomous decision making method for the operation speed of the unmanned agricultural machinery according to claim 6, wherein the step S32 is specifically:
input vector of Gaussian process regression prediction model of unmanned agricultural machinery target operation speedmBy difference in elevationTransverse crossRoll angle->Lateral position deviation->And heading angle->Composition, thus for formula (17)lThe determination of (1) employs an automatic determination of the correlation, expressed as:
wherein ,respectively represent the height difference +.>Roll angle->Lateral position deviation->And heading angle->A length scale of each dimension of (a);
the training process of the Gaussian process regression prediction model is regarded as a problem for solving nonlinear numerical optimization, and super-parameter vectors are defined:
Optimizing the super-parameters by adopting a Maximum Likelihood Estimation (MLE) method, wherein the marginal likelihood function is as follows:
likelihood obeys a gaussian distribution:
the method is obtained by a Gaussian process regression prediction model:
the integration of equation (22) still obeys the gaussian distribution:
solving the negative logarithm of the formula (20) to obtain a negative logarithm boundary likelihood function:
solving the minimum of equation (24) to obtain optimized hyper-parameters, i.e. training of Gaussian process regression prediction model is converted into the optimization of equation (24)Problem of chemical transformation, objective function isLThe optimization objective is to solveLIs the minimum of (2);
the conjugate gradient method is adopted to minimize the partial derivative, so as to obtain the optimal solution of the super parameter, namely, the altitude difference obtained according to the measurement of the unmanned agricultural machineryRoll angle->Lateral position deviation->And heading angle->And predicting the target operation speed to be adjusted through a Gaussian regression process.
8. The autonomous decision making method for the operation speed of the unmanned agricultural machinery according to claim 4, wherein in the step S4, the evaluation of the regression prediction result of the Gaussian process specifically adopts an average absolute errorMAEAnd judging the deviation between the predicted value and the true value of the sample:
wherein , and />Respectively represent the firstiA true value and a predicted value,Nto predict the number of samples;MAEthe smaller the value, the better the model predictive performance;
autoregressive training samples using a trained Gaussian process regression prediction model according to equation (15), and calculating according to equation (26)MAEJudging whether the training is successful or not, and if the training is unsuccessful, returning to the step S3; otherwise, step S5 is entered.
9. The autonomous decision making method for the operation speed of the unmanned agricultural machinery according to claim 1, wherein the step S5 is specifically:
the trained Gaussian process regression prediction model is deployed on a terminal controller of the unmanned agricultural machine, and data of the unmanned agricultural machine in a period of time is obtained to serve as test data samplesObtaining a corresponding unmanned agricultural machinery prediction speed by adopting a Gaussian process regression prediction model>With this mean value of the predicted speed +.>Decision speed as target->。
10. The autonomous decision making method for the operation speed of the unmanned agricultural machinery according to claim 9, wherein the step S6 is specifically:
will obtain a target decision speedAn on-board speed controller transmitted to the unmanned agricultural machinery, the speed controller determining a speed according to the current speed and the target>And the difference value is used for automatically adjusting the operation speed of the unmanned agricultural machinery. />
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