50results about How to "Reduce computational difficulty" patented technology

The invention discloses a puncture path planning method and system, and aims to quickly calculate optimal puncture path information based on optical and computer rendering thoughts so as to provide reference for medical staff and provide an auxiliary means for clinically acquiring information. The method comprises the following steps: constructing a three-dimensional model through a medical image; the method comprises the following steps: defining organs and tissues as units with incompletely same light absorbance, and assigning light absorption coefficients to each unit according to whether a biopsy needle is allowed to pass or not and the risk degree of puncture; a light source is arranged in a puncture target area, gray information of the skin surface is obtained by analyzing the light absorbance on different paths, and the gray information is used for feeding back the recommendation degree of each puncture starting point. According to the method, selection of the puncture path is converted into searching of the optimal puncture starting point, a brand-new concept of planning and recommending the puncture path is provided by combining the optical propagation principle, and the position information of the optimal puncture starting point can be visually displayed and is more comprehensive and reliable.

The embodiment of the invention provides a clock gating circuit conversion method and device and related equipment, and the method comprises the steps: obtaining target circuit design data of a clock gating circuit before conversion, the target circuit design data being part of data in the circuit design data of the clock gating circuit before conversion; predicting the power consumption income of the clock gating circuit before conversion based on the target circuit design data by using a pre-established power consumption income prediction model to obtain a power consumption income prediction result; wherein the power consumption income prediction model is used for predicting a power consumption change trend between the clock gating circuit before conversion and the clock gating circuit after conversion so as to form a power consumption income prediction result; if it is determined that the power consumption income prediction result is the forward power consumption income, the clock gating circuit before conversion is converted into the clock gating circuit after conversion. According to the technical scheme provided by the embodiment of the invention, the efficiency of determining the switching effectiveness of the clock gating circuit can be improved.

The invention relates to an analytical method for a three-dimensional tunnel segment joint leakage problem, and the method comprises the steps: converting a complex three-dimensional seepage problem into a two-dimensional annular region problem through conformal transformation, solving the two-dimensional annular region problem, converting the solution into an original three-dimensional plane through inverse transformation, obtaining an explicit analytical solution of a total water head of a seepage field, and effectively reducing the calculation difficulty and cost; through the combined application of conformal transformation, variable substitution and a variable separation method, the accuracy and reliability of an analytical solution are improved, the pore water pressure and the leakage amount at the tunnel joint are accurately calculated, an accurate seepage field analytical solution is obtained instead of an approximate solution or an improved analytical solution on the basis of other people, and the method has the advantages of being high in practicability and easy to popularize. And a scientific basis is provided for leakage prevention of tunnel engineering.

The invention relates to a welding seam gap measuring method, a medium and equipment, and the method comprises the steps: obtaining a workpiece contour point cloud of a to-be-welded workpiece, determining a welding seam region, traversing all points in the welding seam region, obtaining a plurality of similar points of a current point, and obtaining a plurality of chords corresponding to the current point according to all the similar points; and calculating the distance between each point in the welding line area and all corresponding chords, obtaining an accumulated point chord value of all points, obtaining an extreme point corresponding to the accumulated point chord value, taking the extreme point as an end point of the welding line gap, and obtaining a welding line gap value according to the distance between the welding line end points and the prior workpiece thickness. The problems that in the prior art, special-shaped welding seams cannot be recognized in real time, the welding seam recognition efficiency is low, and reliability is insufficient are solved.

The invention provides an image splicing method, an image splicing device, a terminal and a computer storage medium, and the method comprises the steps: obtaining all to-be-spliced images, obtaining the actual displacement between two adjacent to-be-spliced images based on a spatial position relation, and obtaining the actual displacement between the two adjacent to-be-spliced images; according to the method, the two to-be-spliced images are subjected to actual displacement, the overlapping area corresponding to the two to-be-spliced images is obtained based on the actual displacement, and the to-be-spliced images are spliced and fused based on the overlapping area to obtain the final spliced image, so that the calculation complexity in the image splicing process is simplified, and the image quality of the spliced image is improved.

The invention discloses a smart well lid monitoring and early warning method and system based on AI sampling, and the method comprises the steps: S1, collecting and preprocessing the original data of a smart well lid, and obtaining the preprocessed smart well lid data; s2, original node features are constructed, then well lid rasterization features are obtained in combination with the well lid position, and finally node fusion features are extracted; s3, calculating betweenness, proximity, harmonic and eccentric centrality of each node, and then combining node fusion features to construct a node correlation matrix and a node influence range matrix; s4, calculating a comprehensive importance index of each node, then carrying out descending sorting on all the nodes, and extracting important nodes; s5, important node features are extracted, and a first deletion node and a second deletion node are calculated; and then node deletion is carried out from all nodes to obtain residual node numbers, and intelligent well lid data acquisition is carried out according to the residual node numbers. The problem that a traditional intelligent well lid monitoring mode is insufficient in battery life can be solved.

The invention discloses a distributed photovoltaic group scheduling strategy generation method, a distributed photovoltaic group scheduling method, a distributed photovoltaic group scheduling device and distributed photovoltaic group scheduling equipment, and the method comprises the steps: carrying out the generation power prediction of distributed photovoltaic in a low-voltage transformer area, and obtaining the predicted generation power of each distributed photovoltaic at a prediction point; obtaining target regulation and control power corresponding to the prediction point; determining a distributed photovoltaic group scheduling strategy corresponding to the prediction point according to the predicted power generation power of each distributed photovoltaic at the prediction point, the target regulation power corresponding to the prediction point and a distributed photovoltaic group scheduling business rule; the distributed photovoltaic group scheduling strategy can comprise distributed photovoltaic regulation and control and distributed photovoltaic power output proportion regulation and control. According to the scheme disclosed by the invention, the calculation complexity and the calculation amount of group scheduling strategy generation can be reduced, the calculation efficiency can be improved, the method is easy to apply on the edge side, and the distributed photovoltaic group scheduling business rule is fused in the group scheduling strategy generation process, so that distributed group scheduling and group control can well meet business requirements.

The invention provides a method for calculating the length of a tapping line of a transformer on-load switch, and belongs to the technical field of transformers. The invention provides a method for calculating the length of a tapping line of an on-load switch of a transformer. The method comprises the following operation steps: S1, n groups of tapping terminals of the on-load switch are distributed along the outer circumference of a selection switch; s2, the length of the on-load switch tapping wire between the n-th group of on-load switch tapping terminals and the fixing groove of the wire clamp is Ln, the distance between the n-th group of on-load switch tapping terminals and the fixing groove of the wire clamp in the long axis direction of the transformer is Xn, the distance between the n-th group of on-load switch tapping terminals and the fixing groove of the wire clamp in the short axis direction of the transformer is Yn, and the length of the on-load switch tapping wire between the n-th group of on-load switch tapping terminals and the fixing groove of the wire clamp is Ln; in the height direction of the transformer, the distance between the n-th group of on-load switch tapping terminals and the fixing groove of the wire clamp is Zn, and LK = Xn + Yn + Zn. According to the method for calculating the length of the on-load switch tapping line of the transformer, calculation is simple and rapid, and the calculated length of the on-load switch tapping line is moderate.

The application discloses a layout design method and device for a ventilation pressure regulating facility of an underground water storage cavern, and the method comprises the following steps: determining layout parameters of a tunnel group of the water storage cavern; constructing a water power simulation model of the water storage cavern composed of the tunnel group based on a one-dimensional water flow motion control equation; solving a distribution of a water hydraulic characteristic value along a path under a non-constant flow condition according to the water power simulation model, determining a space-time distribution of a tunnel section in a pressurized state and a non-pressurized state, judging a required ventilation amount according to the space-time distribution, and initially drafting a layout scheme of a cavern ventilation pressure regulation; adjusting the layout parameters, checking and analyzing whether the layout scheme of the ventilation pressure regulating facility is reasonable under the non-constant flow operation condition, and correcting the layout parameters of the water power simulation model established based on the one-dimensional water flow motion control equation according to a calculation result; and repeating the steps of adjusting, checking and correcting until a reasonable layout scheme of the ventilation pressure regulating facility is constructed.

The invention discloses a fault and state decoupling method based on a dimensionality reduction observability matrix. The method comprises the following steps: S1, giving a Lie derivative calculation rule of an autonomous diagnosis system of a spacecraft; s2, establishing an observable matrix of the autonomous diagnosis system of the spacecraft by using a Lie derivative calculation rule; s3, giving a common subspace and a subspace residual term of the observable matrix; s4, calculating a pseudo-inverse matrix of residual items of the subspace; s5, calculating a left null space of the common subspace; s6, multiplying the pseudo-inverse matrix by the left null space to obtain the left null space of an observable matrix of the spacecraft autonomous diagnosis system; and S7, performing fault and state decoupling on the left null space of the observable matrix of the spacecraft autonomous diagnosis system and the observation function of the spacecraft autonomous diagnosis system. According to the left null space calculation method for the observable matrix of the spacecraft autonomous diagnosis system, the calculation complexity is reduced, the algorithm is reliable, few calculation resources are occupied, and the method is suitable for being carried out on spacecrafts with seriously limited calculation resources.

This invention relates to the field of lighting control technology, specifically a lighting control method and system. The lighting control method includes the following steps: obtaining the influence range of the lighting; identifying several designated targets within a certain range; marking each designated target; obtaining the current distance between each designated target and the lighting source; obtaining the current output power of the lighting source; and outputting a protection signal when a marker enters the influence range, and the current distance is less than a preset distance threshold, and the output power is greater than a preset power threshold. This invention solves the complex problem of the degree of lighting effect in a simple way, replacing complex energy density calculations, and intuitively and quickly achieves safety judgment, providing a new perspective on solving the impact of lighting sources on designated targets.

The application provides a parameter design method of a acetabular revision guiding support based on image modeling, and belongs to the field of medical instruments, and comprises the following steps: establishing an acetabular coordinate system, and extracting geometric parameters of medical images of a bone defect area; defining a plurality of bone trabecula metal acetabular cup outer cup abduction angle, anteversion angle and vertical upward height, and coupling to obtain a limited parameter combination; respectively calculating the contact volume ratio η of the bone trabecula metal acetabular cup and the bone defect area and the distance Doffse from the rotation center of the outer cup to the healthy rotation center; screening a group of optimal parameters according to the numerical values of η and Doffse; and designing a guiding support for the outer cup according to the optimal parameters. The application provides a simple, efficient and accurate digital solution for Paprosky III type acetabular defect revision, and the core geometric quantification method and guiding support design can be expanded to other complex bone defect repair, and has significant clinical application value and technical foresight.

The application discloses a high-parallelism storage-computation integrated polar code decoding method based on coset decoding, and belongs to the technical field of channel coding and decoding. The method comprises the following steps: constructing an error pattern group and a check constraint subgroup; performing coset division on the error pattern group to obtain a set of mutually disjoint cosets; screening a limited number of minimum cosets based on the minimum Hamming weight of the cosets; and performing parallel decoding processing on the paths corresponding to the minimum cosets in the storage-computation integrated architecture. k The number of paths in the traditional multi-bit decoding is reduced from 2 to a preset number L through coset division, and the parallel execution of the likelihood information updating and the path metric calculation is realized in combination with the calculation-type storage array, so that the decoding performance is ensured, the calculation complexity and the hardware resource consumption are significantly reduced, and the decoding throughput and the energy efficiency are improved.

This invention discloses a method, system, and apparatus for detecting the flow rate of a belt conveyor, relating to the field of belt conveyor flow rate detection. The method includes: obtaining the radius of the material cross-section; constructing an equation for the circle containing the material cross-section based on the radius of the material cross-section; calculating the first and second contact points of the circles containing the material cross-section and the belt cross-section based on the equations of the two circles; calculating the area of ​​the material cross-section based on the center and radius of the circles containing the material cross-section and the belt cross-section, the first contact point, and the second contact point; and calculating the real-time material flow rate of the belt conveyor based on the area of ​​the material cross-section and the conveying speed of the belt conveyor. This invention achieves the goal of real-time monitoring of the belt conveyor system, minimizes the time required for real-time measurement of the material flow rate, and improves the operating efficiency of the belt conveyor system.

The invention provides a method and a device for evaluating the transient support capability of an energy storage power station to a power grid, and the method comprises the steps: calculating the weight of an index value after the dimensionalization processing through different weighting methods, and optimizing the weight of the index value after the dimensionalization processing, and the transient support capability of the energy storage power station on the power grid is evaluated according to the obtained combination weight of each evaluation index. It can be seen that different weights obtained by different weighting methods are comprehensively considered, the upper layer adopts at least two weighting methods to calculate the weight of the index value after the dimensionalization processing, and the lower layer optimizes the weight of the index value after the dimensionalization processing to obtain the combined weight of each evaluation index. That is to say, the combined weight of each evaluation index is obtained by adopting the double-layer combined weighting, the precision of the evaluation result is improved, and the reliability of the energy storage power station for evaluating the transient support capability of the power grid can be further improved.

The present application discloses a data processing method, device, equipment, storage medium and product, which relate to the field of intelligent driving technology. The method obtains vehicle information and map frame information; constructs a map cropping area in the map frame with the vehicle as the center; extracts lane centerline data in the map frame, and the lane centerline data includes a plurality of lane line coordinates; crops the map frame according to the vehicle information, the lane line coordinates and the map cropping area and a preset data set cropping strategy to obtain a cropped map data set, and the data set cropping strategy includes a lane line cropping strategy and a lane coordinate cropping strategy. The intelligent driving map data set is cropped by the above method to reduce the complexity and calculation difficulty of the intelligent driving map data set, thereby improving the intelligent driving prediction efficiency.

The invention provides a power distribution network multi-stage current protection method based on a residual voltage locking principle, which aims at power distribution network stage differential protection application scenes and comprises instantaneous quick-break protection, time-limited quick-break protection, overcurrent protection and residual voltage locking criteria. On the basis of traditional power distribution network protection, a residual voltage locking principle is utilized, and a multi-stage current protection technology and a feeder automation function are combined, so that firstly, limitation on high current value setting caused by a current transformer supersaturation phenomenon is eliminated, effective protection of a transformer substation outgoing line switch on a near-region fault is realized, and releasing of stage difference protection delay is guaranteed; secondly, the cooperative cooperation of relay protection and feeder automation is realized, and the condition of line switching connection can be effectively handled; and thirdly, low-voltage multi-stage protection is set, the protection requirement in the low-voltage transformer area is considered, and the system has the advantages of high protection selectivity, rapid and accurate fault isolation and the like.

The embodiment of the invention relates to a scientific computing service system. The system comprises a service gateway, a project management module, a task management module, a management database, a project storage module, a computing node resource pool, a task monitoring module and a life cycle management module, the service gateway is used for carrying out service request distribution on the project / task management module; the project management module is used for processing project creation / query / deletion; the task management module is used for processing mirror image / node query and task creation / query / submission / downloading / deletion; the task monitoring module is used for monitoring a task running state; and the life cycle management module is used for physically deleting the deleted database information. Scientific calculation implementation steps can be simplified, the calculation difficulty is reduced, the calculation efficiency is improved, and the learning and research efficiency is improved.

The invention discloses a shale gas field yield prediction method. The method comprises the following steps: 1, establishing a shale gas field yield prediction initial model which only takes time as an independent variable parameter; 2, obtaining a yield fitting value of the shale gas field according to the shale gas field yield prediction initial model; 3, drawing a yield prediction curve according to the yield fitting value and the corresponding development time; 4, dividing the yield prediction curve into an ascending section yield prediction curve and a descending section yield prediction curve; 5, respectively processing the ascending section yield prediction curve and the descending section yield prediction curve to obtain a final shale gas field yield prediction model; and 6, predicting the yield of the shale gas field according to the final shale gas field yield prediction model. According to the method, a shale gas field yield prediction model is established through a mathematical method which only takes time as an independent variable parameter, so that more accurate yield prediction can be realized on the basis of fewer parameters, and the technical problems that the existing yield prediction method obtains more parameters, and the parameters are difficult to obtain and inaccurate to obtain are solved.

The tunnel clearance convergence measurement method described in the present invention is applied to the measurement and calculation of the convergence displacement of the tunnel structure when the tunnel support structure or the surrounding rock and soil body is offset, so as to effectively solve the purpose of accurate measurement and calculation after the rock and soil body is offset, and realize the high-precision requirement of tunnel clearance convergence measurement. The tunnel clearance convergence measurement method sets up a total station at an observation point, and uses the total station to measure the distance a1 from the total station to the left clearance convergence point and the distance a2 from the total station to the right clearance convergence point, the angle α1 of the rear sight point-total station eyepiece-left clearance convergence point, and the angle α2 of the rear sight point-total station eyepiece-right clearance convergence point; uses a laser rangefinder to measure the height c of the total station, the distance b1 from the observation point to the left clearance convergence point, and the distance b2 from the observation point to the left clearance convergence point; obtains the clearance convergence value l after vertical and horizontal correction through observation, and the clearance convergence value l after correction minus the clearance convergence initial value l0 is the cumulative change of tunnel clearance convergence.

The present invention relates to the field of image recognition, and an embodiment discloses a trajectory generation method, device, electronic device and storage medium. The method comprises: obtaining original trajectory data corresponding to a target user, and dividing the original trajectory data into at least one original trajectory sub-data according to time information; determining the target position information corresponding to the target user in each area based on the original trajectory sub-data; and determining the target trajectory information corresponding to the target user based on at least one target position information corresponding to each original trajectory sub-data. The technical solution of the embodiment of the present invention realizes compression processing of multiple original trajectory data, and can clearly obtain the trajectory data of the user, thereby achieving the technical effect of reducing the redundancy of trajectory data and the difficulty of data storage, as well as reducing the difficulty of calculation and processing when subsequently analyzing the trajectory data.

The invention discloses an acoustic-solid coupling model of a bionic robotic fish based on an MFC material. The acoustic-solid coupling model comprises a bionic robotic fish main body, a bionic robotic fish motion control model, an MFC material mechanical response model, a bionic robotic fish modal analysis model and an acoustic-solid coupling analysis model, the piezoelectric effect and the driving mechanism are defined, and a theoretical model is provided for application of the bionic robotic fish made of the MFC material. According to the method, the structure behavior of the robotic fish in the sound field drainage basin is calculated through sound-solid coupling, the modal and deformation response are promoted, the calculation difficulty is reduced, and the structure of the robotic fish is further optimized. According to the method, an acoustic-solid coupling method and modal and transient analysis are combined, the underwater motion state of the robotic fish is predicted, and the propelling motion of the bionic robotic fish under the driving of sinusoidal voltage in a fluid calculation domain is simulated. By changing the amplitude and the phase difference of the driving voltage of the MFCs on the left side and the right side, straight and steering swimming movement of the bionic robotic fish is achieved.

This invention discloses a method, apparatus, and storage medium for segmenting deformable electron beam mask patterns. The method includes: first, determining the concave vertices in a composite polygon; then, generating candidate segmentation lines based on the concave vertices; next, constructing correlation data between the candidate segmentation lines; then, calculating the total cost of each candidate segmentation line; optimizing the candidate segmentation lines based on their total costs; selecting candidate segmentation lines based on their total costs; and finally, segmenting the composite polygon based on the selected candidate segmentation lines. This invention achieves high-efficiency and high-precision mask pattern segmentation by generating candidate segmentation lines from the concave vertices of the composite polygon, constructing relationships between the candidate segmentation lines, and calculating the total cost of each candidate segmentation line. This allows for the formulation of a selection strategy based on the total cost of each candidate segmentation line and the relationships between them, resulting in the optimal segmentation method.

This invention discloses a method and system for calculating the load margin of a three-phase unbalanced distribution network. First, the network topology is traversed to obtain line parameters and load access methods, establishing an initial semidefinite programming model of the three-phase unbalanced branch power flow and converting it to a sequence component framework. Next, a positive-sequence power flow Jacobian matrix is ​​constructed, and the minimum singular value lower bound constraint and delta-connected load power constraint are introduced using the matrix maximum convex subset construction method. Then, an iteratively optimized semidefinite relaxation-tightening constraint is established using a semidefinite programming method, forming the final load margin calculation model. Finally, the relaxation matrix result is obtained through iterative solving, and the load margin power flow result is output. This invention can accurately assess the load margin of a three-phase unbalanced distribution network, exhibiting good convergence and accuracy.

The invention specifically relates to a method for positioning a ground fault of an underground cable, and belongs to the technical field of data processing methods for positioning the ground fault of the underground cable by using a matrix. According to the invention, the combination of the traveling wave speed and time is selected by considering the difference of the traveling wave propagation speed in different fault scenes; the method comprises the following steps of: forming a fault difference matrix by selecting a distance from a traveling wave generated at a fault point to endpoints of a main line and each branch line, and subtracting the fault difference matrix from a fixed difference matrix formed by network topology of an underground cable to form a position judgment difference matrix; whether the fault point specifically occurs on the main line or the specific branch line of the underground cable is judged through the position judgment difference matrix, and finally the specific position of the fault point is calculated through the traveling wave arrival speed and time collected by the traveling wave collector, so that the calculation difficulty is greatly reduced on the premise of not depending on the electrical parameters of the cable, and the working efficiency is improved. Therefore, the ground fault of the underground cable can be quickly and accurately positioned.

The invention belongs to the field of hydraulic system hydraulic conduit dynamic characteristic theoretical modeling, and particularly relates to a hydraulic conduit dynamic pressure flow characteristic calculation model and a using method, and the hydraulic conduit dynamic pressure flow characteristic calculation model comprises a to-be-calculated section, a dynamic pressure flow characteristic calculation model and an internal variable transfer model; the section to be calculated is composed of multiple sections of conical hydraulic guide pipes, and the multiple sections of conical hydraulic guide pipes comprise guide pipes composed of a one-way progressive increase axial curve outer contour, a monotonically progressive increase axial linear outer contour, a monotonically progressive decrease axial linear outer contour and a one-way progressive decrease axial curve outer contour; each section of the conical hydraulic guide pipe comprises radial outer contours with different drift diameters and corresponds to different inlet boundary conditions and outlet boundary conditions of the conical hydraulic guide pipe. The method has the advantages of being low in calculation difficulty, high in visualization degree, high in calculation precision and easy to be compatible with hydraulic valve, pump and motor dynamic characteristic theoretical models, and efficient data interaction is achieved.

The invention provides a method, device and equipment for determining the generating capacity of a vertical-axis wind power plant, and relates to the technical field of wind power plants. The method comprises the following steps: acquiring basic parameters of a vertical-axis wind power plant and wind resource distribution parameters of each vertical-axis wind generating set; according to the power curve and the wind resource distribution parameters, the theoretical generating capacity of each vertical axis wind generating set is determined; according to the basic parameters and a preset general wake flow value standard library, a first wake flow value corresponding to each vertical axis wind generating set is determined through the average wind speed of the vertical axis wind generating set in the preset sector and the distance between the vertical axis wind generating set and the adjacent vertical axis wind generating set; according to the wind direction frequency and the first wake flow value, determining a target wake flow value of each vertical axis wind generating set; and determining the target generating capacity of the vertical-axis wind power plant according to each target wake flow value and the theoretical generating capacity. According to the scheme, rapid and accurate evaluation of the generating capacity of the vertical-axis wind power plant is realized, and meanwhile, the calculation difficulty is reduced.

The invention discloses a robot visual tracking method. The execution subject of the robot visual tracking method is a robot equipped with a camera and an inertial sensor. The robot visual tracking method comprises the following steps: the robot uses a window matching method to perform image tracking. When the robot successfully performs image tracking using the window matching method, the robot stops using the window matching method to perform image tracking, and then the robot uses a projection matching method to perform image tracking. Then, when the robot fails to perform image tracking using the projection matching method, the robot stops using the projection matching method to perform image tracking, and then the robot uses the window matching method to perform image tracking.

The invention discloses a pantograph strength calculation modeling method, a calculation method, equipment, a medium and a product. The modeling method comprises the following steps: constructing a pantograph finite element model; constructing a pantograph lifting device finite element model based on the pantograph finite element model; based on the pantograph finite element model and the pantograph lifting device finite element model, establishing bolt connection between a bottom plate of an air bag and an air bag mounting seat on a pantograph underframe, and establishing column hinge connection between a hinge end of a driving rod and a driving rod support on the pantograph underframe; rigid connection is established between the steel wire rope and the clamping groove of the adjusting plate and between the steel wire rope and the steel wire rope fixing support on the pantograph lower arm rotating shaft, and a pantograph strength calculation model comprising the pantograph lifting device is obtained. According to the method, during pantograph strength calculation, the real stress state of the pantograph and the pantograph lifting device can be reflected, the real stress state of the connecting part of the pantograph and the pantograph lifting device can also be reflected, and the pantograph strength calculation precision is improved.

The invention discloses an atmospheric carbon dioxide background concentration detection method based on a laser radar, and the method comprises the steps: receiving a corresponding echo signal based on a plurality of groups of detection lasers with range resolution transmitted to a target atmosphere by the laser radar; the detection laser comprises first laser and second laser, and the absorption coefficient of the first laser to carbon dioxide is higher than that of the second laser to carbon dioxide; determining an absorption coefficient difference of the same group of detection laser under different distances based on the echo signals; determining an absorption coefficient difference mean value based on the absorption coefficient difference corresponding to each group of detection laser; and determining the background concentration of the atmospheric carbon dioxide based on the mean value of the absorption coefficient difference. The detection method can realize large-range measurement so as to provide wide spatial distribution data, does not need to perform physical contact on the sample, and is simple to operate and free of interference.