Error calibration method, device and equipment of methane observation satellite, medium and program product

Abstract

The invention discloses an error calibration method, device and equipment for a methane observation satellite, a medium and a program product, relates to the technical field of methane observation, and is used for accurately calibrating errors of the methane observation satellite so as to support accurate calibration of model parameters. The method comprises the following steps: acquiring measurement information and satellite observation information in a natural gas emptying process at a reference position; fitting methane distribution change information of a space above the reference position based on the detection results of the plurality of detection moments; the methane distribution change information is used for representing the diffusion form of methane and the relationship of the column concentration at a plurality of detection positions along with time change; fitting a satellite observation result of a space above the reference position based on the methane observation information at the top crossing moment; and calibrating error information when the satellite observes methane according to information corresponding to the top crossing moment in the methane distribution change information and a satellite observation result.

Description

Technical Field

[0001] This application relates to the field of methane observation technology, and in particular to an error calibration method, apparatus, equipment, medium and program product for a methane observation satellite. Background Technology

[0002] Currently, accurately monitoring the spatiotemporal distribution and trends of methane is increasingly important for effectively addressing global warming. Satellite remote sensing is an effective means of obtaining large-scale CH4 concentration data, enabling large-scale monitoring of global CH4 concentrations. However, the presence of gases such as water vapor and oxygen in the atmosphere that absorb CO2 wavelengths interferes with satellite reception of CH4 signals, resulting in significant CH4 inversion errors. To improve CH4 inversion accuracy, it is necessary to establish high-precision model parameterization relationships and calibrate the model parameters. Therefore, it is crucial to accurately calibrate the errors of methane observation satellites to support accurate model parameter calibration. Summary of the Invention

[0003] The purpose of this application is to provide an error calibration method, apparatus, equipment, medium, and program product for methane observation satellites, which can be used to accurately calibrate the errors of methane observation satellites to support accurate calibration of model parameters.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] In a first aspect, embodiments of this application provide an error calibration method for a methane observation satellite, comprising: acquiring measurement information and satellite observation information during the natural gas venting process at a reference position; the measurement information includes the detection results of a methane column concentration detection device at multiple detection times, and the detection result at each time time includes the methane column concentration at multiple detection locations in the space above the reference position; the satellite observation information includes methane observation information at the satellite's overhead transit time; based on the detection results at multiple detection times, fitting methane distribution change information in the space above the reference position; the methane distribution change information is used to represent the diffusion pattern of methane and the relationship between column concentration and time at multiple detection locations; based on the methane observation information at the overhead transit time, fitting the satellite observation results in the space above the reference position; the satellite observation results include the diffusion pattern of methane in the space above the reference position and the column concentration in multiple resolution grids; and calibrating the error information when the satellite observes methane based on the information corresponding to the overhead transit time in the methane distribution change information and the satellite observation results.

[0006] Based on this, this application can fit the methane distribution change information by using the methane column concentration detected by the methane column concentration detection equipment, thereby accurately determining the true methane column concentration at the moment of satellite overhead, and further accurately calibrating the error information of satellite observation of methane. Therefore, this application can be used to accurately calibrate the error of methane observation satellites to support accurate calibration of model parameters.

[0007] In some embodiments, based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results, the error information of satellite observation of methane is calibrated, including: aligning the diffusion pattern of methane at the overpass time and the column concentration at multiple detection locations in the methane distribution change information with the diffusion pattern of methane and the column concentration in multiple resolution grids in the satellite observation results to determine the reference column concentration of methane in each resolution grid; the reference column concentration is used to represent the column concentration at the detection location that falls within the resolution grid after alignment; and the error information of satellite observation of methane is calibrated based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results.

[0008] In some embodiments, the error information for satellite observation of methane is calibrated based on the reference column concentration in each resolution grid and the column concentration in each resolution grid of the satellite observation results. This includes: determining the error in each resolution grid when observing methane based on the reference column concentration in each resolution grid and the column concentration in each resolution grid of the satellite observation results; calibrating the error information for satellite observation of methane based on the error in each resolution grid when observing methane; the error information includes at least one of the following: maximum error, minimum error, and average error.

[0009] In some embodiments, the measurement information further includes the metering results of the natural gas flow meter at multiple detection times; the method further includes: fitting the venting change information of the space above the reference position based on the metering results of the multiple detection times; the venting change information is used to represent the relationship between the venting amount of methane and the time; determining the telemetry result of the venting amount of methane in the space above the reference position based on the methane observation information at the overpass time; and calibrating the observation error of the satellite's methane emissions based on the venting amount corresponding to the overpass time in the venting change information and the venting amount telemetry result.

[0010] In some embodiments, the measurement information further includes meteorological parameters at multiple detection times; the meteorological parameters at each time time include wind speed, wind direction, temperature, humidity, and surface albedo; based on the reference column concentration in each resolution grid and the column concentration in each resolution grid of the satellite observation results, the error information of satellite observation of methane is calibrated, including: based on the meteorological parameters at the overpass time and the reference column concentration in each resolution grid, correcting the column concentration in each resolution grid of the satellite observation results to obtain the corrected column concentration in each resolution grid; and calibrating the error information of satellite observation of methane based on the reference column concentration in each resolution grid and the corrected column concentration in each resolution grid.

[0011] In some embodiments, a methane column concentration detection device is mounted on an aircraft, which cruises above a reference position during natural gas venting. Acquiring measurement information during the natural gas venting process at the reference position includes: acquiring the pose information of each of the multiple aircraft, and the detection values ​​of the methane column concentration detection devices carried by each aircraft at each detection time; the pose information includes the pose of the aircraft at each detection time; determining the detection position of the methane column concentration detection devices carried by each aircraft at each detection time based on the pose information of each aircraft; and determining the detection results at multiple detection times based on the detection values ​​and detection positions of the methane column concentration detection devices carried by each aircraft at each detection time.

[0012] Secondly, embodiments of this application provide an error calibration device for a methane observation satellite, comprising: an acquisition unit and a processing unit;

[0013] The acquisition unit is used to acquire measurement information and satellite observation information during the natural gas venting process at the reference position; the measurement information includes the detection results of the methane column concentration detection equipment at multiple detection times, and the detection results at each time time include the methane column concentration at multiple detection locations in the space above the reference position; the satellite observation information includes methane observation information at the time of satellite overpass.

[0014] The processing unit is used to fit the methane distribution change information in the space above the reference position based on the detection results at multiple detection times; the methane distribution change information is used to represent the diffusion pattern of methane and the relationship between column concentration and time at multiple detection positions.

[0015] The processing unit is also used to fit satellite observation results in the space above the reference position based on methane observation information at the overpass time; the satellite observation results include the diffusion pattern of methane in the space above the reference position and the column concentration in multiple resolution grids;

[0016] The processing unit is also used to calibrate the error information of satellite observation of methane based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results.

[0017] In some embodiments, the processing unit is specifically configured to: align the diffusion pattern of methane at the time of overhead and the column concentration at multiple detection locations in the methane distribution change information with the diffusion pattern of methane and the column concentration in multiple resolution grids in the satellite observation results, and determine the reference column concentration of methane in each resolution grid; the reference column concentration is used to represent the column concentration at the detection location that falls within the resolution grid after alignment; and calibrate the error information when observing methane by satellite based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results.

[0018] In some embodiments, the processing unit is specifically configured to: determine the error in each resolution grid when observing methane by satellite based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results; calibrate the error information when observing methane by satellite based on the error in each resolution grid; the error information includes at least one of the following: maximum error, minimum error, and average error.

[0019] In some embodiments, the measurement information further includes the measurement results of the natural gas flow meter at multiple detection times; the processing unit is further configured to fit the venting volume change information in the space above the reference position based on the measurement results at multiple detection times; the venting volume change information is used to represent the relationship between the venting volume of methane and time; the processing unit is further configured to determine the telemetry result of the venting volume of methane in the space above the reference position based on the methane observation information at the overpass time; the processing unit is further configured to calibrate the observation error of the satellite's methane emissions based on the venting volume change information corresponding to the overpass time and the venting volume telemetry result.

[0020] In some embodiments, the measurement information further includes meteorological parameters at multiple detection times; the meteorological parameters at each time time include wind speed, wind direction, temperature, humidity, and surface albedo; the processing unit is specifically used to: correct the column concentration in each resolution grid in the satellite observation results based on the meteorological parameters at the overpass time and the reference column concentration in each resolution grid, to obtain the corrected column concentration in each resolution grid; and calibrate the error information when the satellite observes methane based on the reference column concentration in each resolution grid and the corrected column concentration in each resolution grid.

[0021] In some embodiments, the methane column concentration detection device is mounted on an aircraft, which cruises above a reference position during natural gas venting. The acquisition unit is specifically used to: acquire the pose information of each of the multiple aircraft, and the detection values ​​of the methane column concentration detection devices carried by each aircraft at each detection time; the pose information includes the pose of the aircraft at each detection time; based on the pose information of each aircraft, determine the detection position of the methane column concentration detection devices carried by each aircraft at each detection time; and based on the detection values ​​and detection positions of the methane column concentration detection devices carried by each aircraft at each detection time, determine the detection results at multiple detection times.

[0022] Thirdly, embodiments of this application provide a computer device, including: a processor connected to a memory, the memory being used to store computer execution instructions, and the processor executing the computer execution instructions stored in the memory to cause the computer device to perform any of the possible error calibration methods for methane observation satellites as described in the first aspect.

[0023] Fourthly, embodiments of this application provide a computer-readable storage medium for storing computer-executable instructions, which, when executed on a computer device, cause the computer device to perform any of the possible error calibration methods for methane observation satellites described in the first aspect.

[0024] Fifthly, embodiments of this application provide a computer program product, including computer execution instructions, which, when executed on a computer device, cause the computer device to execute any of the possible error calibration methods for methane observation satellites described in the first aspect.

[0025] It should be understood that the technical effects of any of the implementation methods in the second to fifth aspects can be seen in the technical effects of the corresponding implementation methods in the first aspect, and will not be repeated here. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the structure of a computer device provided in an embodiment of this application;

[0028] Figure 2 A flowchart illustrating an error calibration method for a methane observation satellite provided in this application embodiment;

[0029] Figure 3 A schematic diagram of an aircraft formation provided for an embodiment of this application;

[0030] Figure 4 A schematic diagram of a cruise route provided for an embodiment of this application;

[0031] Figure 5 This is a schematic diagram of the structure of an error calibration device for a methane observation satellite provided in an embodiment of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Unless otherwise stated in the following description, "multiple" means two or more.

[0034] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0035] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0036] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0037] First, a brief introduction to the application scenarios involved in this application will be given.

[0038] Currently, global warming caused by greenhouse gas emissions is becoming increasingly prominent. As one of the most important greenhouse gases, methane (CH4) has accounted for approximately one-quarter of the warming effect of all anthropogenic greenhouse gases over the past century. Therefore, accurately monitoring the spatiotemporal variations of CH4 is crucial for understanding climate change.

[0039] Satellite remote sensing is an effective means of obtaining CH4 concentrations over a large area, enabling large-scale monitoring of global CH4 concentrations. However, because the atmosphere contains gases such as water vapor and oxygen that absorb the CO2 band, these gases interfere with the satellite's reception of CH4 signals, resulting in large errors in CH4 inversion.

[0040] To improve the accuracy of CH4 inversion, it is necessary to establish high-precision model parameterization relationships and calibrate the model parameters. Therefore, it is essential to accurately calibrate the errors of the methane observation satellite.

[0041] To achieve the above objectives, this application proposes an error calibration method for methane observation satellites. This method can acquire measurement information and satellite observation information during the natural gas venting process at a reference position. Based on the detection results at multiple detection times, it fits the methane distribution change information in the space above the reference position, and based on the methane observation information at the overpass time, it fits the satellite observation results in the space above the reference position. Thus, based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results, the error information of satellite observation of methane is calibrated.

[0042] Based on this, this application can fit the methane distribution change information by using the methane column concentration detected by the methane column concentration detection equipment, thereby accurately determining the true methane column concentration at the moment of satellite overhead, and further accurately calibrating the error information of satellite observation of methane. Therefore, this application can be used to accurately calibrate the error of methane observation satellites to support accurate calibration of model parameters.

[0043] Next, a brief introduction will be given to the implementation environment (implementation architecture) involved in this application.

[0044] The error calibration method for methane observation satellites provided in this application can be applied to computer equipment. This computer equipment can be a terminal or a server. The terminal can be a personal computer such as a desktop, tablet, or laptop computer, or a remote terminal, user terminal equipment (TE), or mobile device. The server can be a single server or a server cluster consisting of multiple servers. A server cluster can also be called a computer equipment cluster. In some embodiments, the server cluster can also be a distributed cluster. This application does not limit the form of the terminal and the server.

[0045] In terms of hardware implementation, the aforementioned computer equipment can be implemented through, for example... Figure 1 The structure shown is implemented as follows. Figure 1 The diagram shown is a structural schematic of a computer device provided in an embodiment of this application. Figure 1 The computer device shown may include a processor 101, a memory 102, a communication interface 103, and a bus 104. The processor 101, the memory 102, and the communication interface 103 can be connected via the bus 104.

[0046] Processor 101 is the control center of the computer device. It can be a general-purpose central processing unit (CPU) or other general-purpose processors. The general-purpose processor can be a microprocessor or any conventional processor.

[0047] As an example, processor 101 may include one or more CPUs, for example Figure 1 CPU0 and CPU1 are shown in the diagram.

[0048] The memory 102 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto.

[0049] In one possible implementation, the memory 102 can exist independently of the processor 101. The memory 102 can be connected to the processor 101 via a bus 104 and is used to store data, instructions, or program code. When the processor 101 calls and executes the instructions or program code stored in the memory 102, it implements the error calibration method for the methane observation satellite provided in this application embodiment.

[0050] In another possible implementation, the memory 102 can also be integrated with the processor 101.

[0051] The communication interface 103 is used for connecting computer equipment to other devices via a communication network, which may be Ethernet, radio access network (RAN), wireless local area network (WLAN), etc. The communication interface 103 may include a receiving unit for receiving data and a transmitting unit for transmitting data.

[0052] Bus 104 can be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 1 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0053] It should be pointed out that, Figure 1 The structure shown does not constitute a limitation on computer equipment, except Figure 1 In addition to the components shown, a computer device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0054] For ease of understanding, the error calibration method for the methane observation satellite provided in this application will be described in detail below with reference to the accompanying drawings.

[0055] like Figure 2 The diagram shown is a flowchart illustrating an error calibration method for a methane observation satellite provided in an embodiment of this application. Figure 2 The error calibration method shown for the methane observation satellite can be applied to the above. Figure 1 The computer equipment shown in the figure enables the training process of the initial prediction model, thereby obtaining the error calibration model of the methane observation satellite. Figure 2 The methods shown include: S201-S204.

[0056] S201. Obtain measurement information and satellite observation information regarding the natural gas venting process at the reference location.

[0057] The measurement information includes the results from the methane column concentration detection equipment at multiple detection times, with each time's result including the methane column concentration at multiple detection locations in the space above the reference position. Satellite observation information includes methane observations at the satellite's overhead transit time.

[0058] A reference location refers to the area on a natural gas pipeline where a gas transmission station or valve chamber with a vent pipe or venting function is located. This location is used to controllably discharge natural gas from the pipeline or station equipment to ensure system safety and meet operational needs. For example, cold venting can be performed at a natural gas pipeline transmission station or valve chamber. During venting, normal natural gas venting procedures can be followed.

[0059] Methane column concentration detection equipment can be mounted on aircraft (such as airships or drones). The detection location can be the position of the aircraft as it cruises above a reference position during natural gas venting. For example, multiple airships carrying methane column concentration detection equipment can be positioned in an array above a reference position. Each airship can move above the reference position and record its three-dimensional spatial coordinates, allowing multiple methane column concentration detectors to continuously and jointly detect the column concentration during natural gas pipeline venting. Alternatively, the natural gas venting speed (such as the opening degree of the vent valve) can be controlled to simulate natural gas pipeline leaks or oil and gas field leaks to determine the column concentration during these leaks.

[0060] Satellite observation information can include methane column concentration measurements taken by satellites such as Tropomi, EMIT, PRISMA, and Sentiel-2 at the moment of overhead transit. The overhead transit moment is the time when the satellite passes directly above the reference position. The methane column concentration detection equipment and the satellite can be synchronized for detection.

[0061] S202. Based on the detection results at multiple detection times, fit the methane distribution change information in the space above the reference position.

[0062] Among them, the methane distribution change information is used to represent the diffusion pattern of methane and the relationship between column concentration and time at multiple detection locations.

[0063] For example, the column concentration at a detection location in the detection results at a given detection time can be represented as C(X,Y,Z;T). Here, X,Y,Z are the spatial coordinates of the methane column concentration detection device at that detection location, and T is the detection time. After acquiring detection results from multiple detection times, the computer equipment can use interpolation fitting to fit multiple discrete points represented by C(X,Y,Z;T) to obtain information on methane distribution changes.

[0064] S203. Based on methane observation information at the overpass time, fit the satellite observation results in the space above the reference position.

[0065] The satellite observation results include the diffusion patterns of methane in the space above the reference location and the column concentrations within multiple resolution grids. These grids can be of the same size and are divided based on the resolution at which the satellite observed the reference location. The column concentration within a single resolution grid represents the methane column concentration in the vertical space corresponding to that grid at the satellite's observation reference location.

[0066] For example, methane observation information can be used to create radiance images from satellite observations. Computer equipment can process this methane observation information using a satellite-monitored methane column concentration inversion model to obtain the methane column concentration in the space above the reference location across multiple resolution grids. Furthermore, the computer equipment can use the methane column concentrations across these grids to fit the methane diffusion pattern, thus obtaining the satellite observation results.

[0067] S204. Based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results, calibrate the error information when the satellite observes methane.

[0068] For example, computer equipment can determine the reference column concentration of methane in each resolution grid by aligning the diffusion pattern of methane at the moment of overpass and the column concentration at multiple detection locations in the methane distribution change information with the diffusion pattern of methane and the column concentration in multiple resolution grids in the satellite observation results, thereby calibrating the error information when observing methane by satellite.

[0069] In one embodiment, in the above S204, that is, based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results, the error information of the satellite observation of methane is calibrated. This application embodiment provides an optional implementation method, including: S2041-S2042.

[0070] S2041. Align the diffusion pattern of methane at the moment of overhead and the column concentration at multiple detection locations in the methane distribution change information with the diffusion pattern of methane and the column concentration in multiple resolution grids in the satellite observation results to determine the reference column concentration of methane in each resolution grid.

[0071] The reference column concentration is used to represent the column concentration at the detection position that falls within the resolution grid after alignment.

[0072] For example, computer equipment can identify the maximum methane column concentration at multiple detection locations during the methane overpass in the methane distribution change information, and the maximum methane column concentration within multiple resolution grids in the satellite observation results. It then aligns the locations corresponding to these two maximum values ​​and further aligns the methane diffusion pattern at the overpass in the methane distribution change information with the methane diffusion pattern in the satellite observation results. In this way, the methane column concentration detected by the methane column concentration detection equipment and the methane column concentration observed by the satellite can be geographically aligned.

[0073] Furthermore, the computer device can determine the reference column concentration within a resolution grid based on the column concentration at the detection location contained within the aligned resolution grid, thereby obtaining the reference column concentration of methane within each resolution grid.

[0074] S2042. Based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results, calibrate the error information when observing methane by satellite.

[0075] In one embodiment, in S2042 above, that is, based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results, the error information of satellite observation of methane is calibrated. This application embodiment provides an optional implementation method, including: S1-S2.

[0076] S1. Based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results, determine the error of methane observation in each resolution grid.

[0077] S2. Based on the errors in each resolution grid when observing methane by satellite, calibrate the error information when observing methane by satellite.

[0078] The error information includes at least one of the following: maximum error, minimum error, and average error.

[0079] As an example, computer equipment can determine the error within each resolution grid when observing methane from a satellite, based on an error calculation formula. The error calculation formula is:

[0080]

[0081] Where, δ ij Let C(x, y, z; T) be the error within the resolution grid at grid coordinates (i, j). c ) ij The reference column concentration is given by the grid with grid coordinates (i, j). |ΔXCH4| ij Let be the column concentration within the resolution grid with grid coordinates (i, j) in the satellite observation results.

[0082] As an example, computer equipment can calibrate the average error when observing methane by satellites, based on the average error calculation formula or the cumulative average error calculation formula.

[0083] Formula for calculating average error:

[0084]

[0085] The formula for calculating the cumulative average error is:

[0086]

[0087] Where, δ avg This represents the average error. Let C(x, y, z; T) represent the cumulative average error. n is the number of rows in the resolution grid. m is the number of columns in the resolution grid. c ) ij The reference column concentration is given by the grid with grid coordinates (i, j). |ΔXCH4| ij Let be the column concentration within the resolution grid with grid coordinates (i, j) in the satellite observation results.

[0088] In one embodiment, the measurement information also includes the metering results of the natural gas flow meter at multiple detection times. The natural gas flow meter, such as a natural gas mass flow meter or ultrasonic flow meter, can be positioned upstream of the vent valve at a reference location to measure the volume or mass of vented natural gas. The natural gas flow meter can be synchronized with the clocks of the methane column concentration detection device and the satellite equipment, and the methane column concentration detection device and the natural gas flow meter can maintain synchronized measurements at a frequency on the order of seconds.

[0089] In this case, the error calibration method for methane observation satellites provided in this application embodiment further includes: S301-S303.

[0090] S301. Based on the measurement results at multiple detection times, fit the information on the change in the amount of air released in the space above the reference position.

[0091] Among them, the information on changes in venting volume is used to represent the relationship between the amount of methane vented and time.

[0092] For example, computer equipment can fit information on the change in venting volume by measuring the venting volume at discrete points in the venting process using a natural gas flow meter.

[0093] S302. Based on the methane observation information at the time of overhead, determine the telemetry result of the amount of methane released into the space above the reference position.

[0094] For example, computer equipment can process methane observation information through inversion models to obtain telemetry results of the amount of methane released into the space above the reference position.

[0095] S303. Based on the venting volume corresponding to the overpass time in the venting volume change information and the venting volume telemetry results, calibrate the satellite's methane emission observation error.

[0096] As an example, computer equipment can calibrate the methane emission observation error of a satellite using a formula for calculating methane emission observation error. The formula for calculating methane emission observation error is:

[0097]

[0098] Where, δ Q This represents the observation error for methane emissions. T is the time of overhead passage. Q (T) Q represents the venting volume corresponding to the moment of overshoot in the venting volume change information. s This is the result of remote sensing of the venting volume.

[0099] In one embodiment, the measurement information also includes meteorological parameters at multiple detection times. The meteorological parameters at each time time include wind speed, wind direction, temperature, humidity, and surface albedo. These meteorological parameters can be collected by meteorological satellites or meteorological devices located at a reference position. Based on this, in the above-described S2042, i.e., when calibrating the error information for satellite observation of methane based on the reference column concentration within each resolution grid and the column concentration within each resolution grid in the satellite observation results, this application embodiment provides another optional implementation, including: Sa-Sb.

[0100] Sa, based on the meteorological parameters at the overpass time and the reference column concentration in each resolution grid, corrects the column concentration in each resolution grid in the satellite observation results to obtain the corrected column concentration in each resolution grid.

[0101] As an example, the computer equipment can use the meteorological parameters at the time of climax as variables, based on the fitting formula, and employ the least squares method or maximum likelihood estimation to perform fitting correction until the global fitting error is minimized, thus obtaining the corrected parameters. The fitting formula is:

[0102] C(T) ij =|ΔXCH4| ij ·f(V,WD,T) e ,RH,α)

[0103]

[0104] Among them, C(T) ij The reference column concentration is given by the grid with grid coordinates (i, j). |ΔXCH4| ij f(V, WD, T) represents the column concentration within the resolution grid at coordinates (i, j) in the satellite observation results. n is the number of rows in the resolution grid. m is the number of columns in the resolution grid. e , RH, α) are the meteorological parameters at the moment of overhead passage, V is the wind speed, WD is the wind direction, and T is the wind direction. e RH represents temperature, α represents humidity, and RES represents surface albedo. 2 This represents the global fitting error.

[0105] Furthermore, the computer equipment can correct the column concentration within each resolution grid in the satellite observation results based on the correction formula and the correction parameters that minimize the global fitting error, thus obtaining the corrected column concentration within each resolution grid. The correction formula is:

[0106]

[0107] Where, f(V, WD, T) e ,RH,α) resmin To correct the parameters. |ΔXCH4| ijLet be the column concentration within the resolution grid with grid coordinates (i, j) in the satellite observation results. The corrected column concentration is given within the resolution grid at grid coordinates (i, j).

[0108] Sb, based on the reference column concentration and the corrected column concentration in each resolution grid, calibrate the error information when observing methane by satellite.

[0109] The specific implementation of this process can be found in the description in S2 above, and will not be repeated here.

[0110] In one embodiment, the methane column concentration detection device is mounted on an aircraft. The aircraft cruises above a reference position during the natural gas venting process. Furthermore, multiple aircraft may be positioned above the reference position. Each aircraft can move in the direction of maximum methane concentration within its measurement area, covering the entire natural gas venting pattern. The formation and spacing of the aircraft should be flexibly adjustable to adapt to changes in the methane diffusion range and pattern.

[0111] Based on this, in the above S201, that is, when obtaining measurement information on the natural gas venting process at the reference position, the present application embodiment provides an optional implementation method, including: S2011-S2013.

[0112] S2011. Obtain the position and attitude information of each aircraft among multiple aircraft, as well as the detection values ​​of the methane column concentration detection equipment carried by each aircraft at each detection time.

[0113] The pose information includes the pose of the aircraft at each of the multiple detection moments.

[0114] S2012. Based on the attitude information of each aircraft, determine the detection position of the methane column concentration detection equipment carried by each aircraft at each detection time.

[0115] S2013. Based on the detection values ​​and detection locations of the methane column concentration detection devices carried by each aircraft at each detection time, determine the detection results at multiple detection times.

[0116] Based on this, the computer equipment can obtain the methane column concentration at each point in the three-dimensional coordinate system above the reference position by using the attitude information of each aircraft and the methane column concentration detection equipment carried by each aircraft.

[0117] In one embodiment, this application also provides a system for calibrating the methane column concentration of a satellite, comprising: multiple spacecraft, a controller, a methane column concentration detection device, a natural gas flow meter, and a data processing center.

[0118] Multiple aircraft are positioned above methane emission sources to measure methane column concentrations and support long cruise durations (e.g., 3 days).

[0119] The controller is used to control the formation, direction of movement, speed, etc. of multiple aircraft. The communication control distance between the controller and the aircraft is no less than 10km.

[0120] The methane column concentration detection equipment is used to collect methane concentration data below the aircraft to obtain the true methane column concentration, with an accuracy requirement of better than 1%.

[0121] Natural gas flow meters are used to measure the volume or mass of vented natural gas, with an accuracy better than 0.5%.

[0122] The data processing center is used to receive measurement data from methane column concentration detection equipment, natural gas flow meter, and methane satellite in real time, and to calibrate the error information of methane observation satellite.

[0123] Thus, this application allows for large-scale area scanning of the same methane emission source using multiple aircraft, providing a more comprehensive understanding of the spatiotemporal distribution of methane concentration from that source. Compared to traditional ground-based stations, this improves the accuracy of methane concentration measurements.

[0124] In one embodiment, the error calibration method for the methane observation satellite provided in this application further includes: S401-S402.

[0125] S401. Image information of the reference object at the reference position is captured by a camera installed on each aircraft.

[0126] S402. Based on the image information captured by each aircraft, determine the attitude information of each aircraft.

[0127] Based on this, this application can obtain images of a reference object at a reference location by photographing it using a camera installed on each aircraft. In this way, not only can the detection location be determined using the data collected by the sensors, but the pose information of each aircraft relative to the ground can also be used to calculate the altitude of each aircraft relative to the ground, so as to more accurately determine the methane distribution change information in the future.

[0128] In one embodiment, the number of aircraft can be determined based on the predicted diffusion range according to wind speed. Furthermore, considering both cost and efficiency, 3 to 10 aircraft can be deployed, with a triangular formation being preferred. For example, as... Figure 3 The diagram shown is a schematic representation of an aircraft formation according to an embodiment of this application. The formation of seven aircraft can be... Figure 3 The triangle shown.

[0129] Each aircraft is responsible for a designated area, conducting patrol surveys. The patrol route covers the assigned area. For example, ... Figure 4 The diagram shown is a schematic representation of a patrol route provided in an embodiment of this application.

[0130] Figure 4 The starting point, cruise direction, and ending point of Route 1 (outbound), Route 1 (return), and Route 2 (round trip) are shown. The aircraft's cruise route can be... Figure 4 Route 1 or Route 2 is shown.

[0131] Furthermore, multiple aircraft can perform simultaneous measurements, but their patrol paths can differ. Considering the measurement needs to cover the entire methane diffusion pattern, the outer boundary of the aircraft's measurement can change with the methane diffusion pattern, and the size of the measurement range can also vary accordingly. Thus, this application can effectively improve the efficiency and accuracy of methane concentration detection through the rational scheduling of multiple aircraft.

[0132] The foregoing primarily describes the solutions of the embodiments of this application from a methodological perspective. It is understood that, in order to achieve the above-described functions, the computer device includes at least one of the hardware structures and software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0133] This application embodiment can divide a computer device into functional units based on the above method examples. For example, each function can be divided into its own functional units, or two or more functions can be integrated into one processing unit. The integrated unit can be implemented in hardware or as a software functional unit. It should be noted that the unit division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0134] For example, such as Figure 5 The diagram shown is a structural schematic of an error calibration device for a methane observation satellite provided in an embodiment of this application. The error calibration device 50 for the methane observation satellite includes: an acquisition unit 501 and a processing unit 502.

[0135] The acquisition unit 501 is used to acquire measurement information and satellite observation information during the natural gas venting process at the reference position; the measurement information includes the detection results of the methane column concentration detection equipment at multiple detection times, and the detection results at each time time include the methane column concentration at multiple detection locations in the space above the reference position; the satellite observation information includes methane observation information at the time of satellite overhead.

[0136] The processing unit 502 is used to fit the methane distribution change information in the space above the reference position based on the detection results at multiple detection times; the methane distribution change information is used to represent the diffusion pattern of methane and the relationship between column concentration and time at multiple detection positions.

[0137] The processing unit 502 is also used to fit the satellite observation results in the space above the reference position based on the methane observation information at the overpass time; the satellite observation results include the diffusion pattern of methane in the space above the reference position and the column concentration in multiple resolution grids;

[0138] The processing unit 502 is also used to calibrate the error information of satellite observation of methane based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results.

[0139] In some embodiments, the processing unit 502 is specifically configured to: align the diffusion pattern of methane at the time of overhead and the column concentration at multiple detection locations in the methane distribution change information with the diffusion pattern of methane and the column concentration in multiple resolution grids in the satellite observation results to determine the reference column concentration of methane in each resolution grid; the reference column concentration is used to represent the column concentration at the detection location that falls within the resolution grid after alignment; and calibrate the error information when observing methane by satellite based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results.

[0140] In some embodiments, the processing unit 502 is specifically configured to: determine the error in each resolution grid when observing methane by satellite based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results; calibrate the error information when observing methane by satellite based on the error in each resolution grid; the error information includes at least one of the following: maximum error, minimum error, and average error.

[0141] In some embodiments, the measurement information also includes the measurement results of the natural gas flow meter at multiple detection times; the processing unit 502 is further configured to fit the venting change information of the space above the reference position based on the measurement results of the multiple detection times; the venting change information is used to represent the relationship between the venting amount of methane and the time change; the processing unit 502 is further configured to determine the telemetry result of the venting amount of methane in the space above the reference position based on the methane observation information at the overpass time; the processing unit 502 is further configured to calibrate the observation error of the satellite's methane emission based on the venting amount corresponding to the overpass time in the venting change information and the venting amount telemetry result.

[0142] In some embodiments, the measurement information further includes meteorological parameters at multiple detection times; the meteorological parameters at each time time include wind speed, wind direction, temperature, humidity, and surface albedo; the processing unit 502 is specifically used to: correct the column concentration in each resolution grid in the satellite observation results based on the meteorological parameters at the overpass time and the reference column concentration in each resolution grid to obtain the corrected column concentration in each resolution grid; and calibrate the error information when the satellite observes methane based on the reference column concentration in each resolution grid and the corrected column concentration in each resolution grid.

[0143] In some embodiments, the methane column concentration detection device is mounted on an aircraft, which cruises above a reference position during natural gas venting. The acquisition unit 501 is specifically used to: acquire the pose information of each of the multiple aircraft, and the detection values ​​of the methane column concentration detection devices carried by each aircraft at each detection time; the pose information includes the pose of the aircraft at each detection time; based on the pose information of each aircraft, determine the detection position of the methane column concentration detection devices carried by each aircraft at each detection time; and based on the detection values ​​and detection positions of the methane column concentration detection devices carried by each aircraft at each detection time, determine the detection results at multiple detection times.

[0144] For a detailed description of the above-mentioned optional methods, please refer to the foregoing method embodiments, which will not be repeated here. Furthermore, the explanation of any of the computer devices provided above and the description of their beneficial effects can be found in the corresponding method embodiments described above, and will not be repeated here.

[0145] This application also provides a readable storage medium storing a computer program that, when run on a computer device, causes the computer device to perform any of the methods described above.

[0146] For explanations of the relevant content and descriptions of the beneficial effects of any of the above-mentioned readable storage media, please refer to the corresponding embodiments described above, which will not be repeated here.

[0147] This application also provides a computer program product containing instructions that, when executed on a computer device, cause the computer device to perform any of the methods described in the above embodiments. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer device, all or part of the flow or function according to the embodiments of this application is generated. The computer device may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a readable storage medium or transmitted from one readable storage medium to another. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The readable storage medium may be any available medium accessible to the computer device or may include one or more data storage devices such as servers or data centers that can be integrated with the medium. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), etc.

[0148] It should be noted that the devices for storing computer instructions or computer programs provided in the embodiments of this application, such as but not limited to the memory and readable storage medium, are all non-transitory.

[0149] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An error calibration method for a methane observation satellite, characterized in that, include: Acquire measurement information and satellite observation information during the natural gas venting process at a reference location; the measurement information includes the detection results of a methane column concentration detection device at multiple detection times, and the detection result at each time time includes the methane column concentration at multiple detection locations in the space above the reference location; the satellite observation information includes methane observation information at the time of satellite overhead. Based on the detection results at the multiple detection times, the methane distribution change information in the space above the reference position is fitted; the methane distribution change information is used to represent the diffusion pattern of methane and the relationship between column concentration and time at multiple detection positions. Based on the methane observation information at the time of the overhead passage, the satellite observation results in the space above the reference position are fitted; the satellite observation results include the diffusion pattern of methane in the space above the reference position and the column concentration in multiple resolution grids; Based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results, the error information of the satellite observation of methane is calibrated.

2. The method according to claim 1, characterized in that, The step of calibrating the error information of satellite observation of methane based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results includes: The diffusion pattern of methane at the overhead moment and the column concentration at multiple detection locations in the methane distribution change information are aligned with the diffusion pattern of methane and the column concentration in multiple resolution grids in the satellite observation results to determine the reference column concentration of methane in each resolution grid; the reference column concentration is used to represent the column concentration at the detection location that falls within the resolution grid after alignment. The error information of the satellite's observation of methane is calibrated based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results.

3. The method according to claim 2, characterized in that, The step of calibrating the error information for satellite observation of methane based on the reference column concentration within each resolution grid and the column concentration within each resolution grid in the satellite observation results includes: Based on the reference column concentration within each resolution grid and the column concentration within each resolution grid in the satellite observation results, the error of the satellite in observing methane within each resolution grid is determined; Based on the error in each resolution grid when the satellite observes methane, the error information when the satellite observes methane is calibrated; the error information includes at least one of the following: maximum error, minimum error, and average error.

4. The method according to claim 3, characterized in that, The measurement information also includes the metering results of the natural gas flow meter at the multiple detection times; the method further includes: Based on the measurement results at the multiple detection times, the information on the change in the amount of venting in the space above the reference position is fitted; the information on the change in the amount of venting is used to represent the relationship between the amount of methane venting and time. Based on the methane observation information at the time of the overhead passage, the telemetry result of the amount of methane released into the space above the reference position is determined. Based on the venting volume change information corresponding to the overpass time and the venting volume telemetry results, the methane emission observation error of the satellite is calibrated.

5. The method according to claim 2, characterized in that, The measurement information also includes meteorological parameters at the multiple detection times; the meteorological parameters at each time time include wind speed, wind direction, temperature, humidity, and surface albedo; the step of calibrating the error information of the satellite observation of methane based on the reference column concentration in each resolution grid and the column concentration in each resolution grid in the satellite observation results includes: Based on the meteorological parameters at the time of overhead and the reference column concentration in each resolution grid, the column concentration in each resolution grid in the satellite observation results is corrected to obtain the corrected column concentration in each resolution grid. The error information for methane observation by the satellite is calibrated based on the reference column concentration and the corrected column concentration in each resolution grid.

6. The method according to claim 2, characterized in that, The methane column concentration detection device is installed on the aircraft, which cruises in the space above the reference position during the natural gas venting process. The acquisition of measurement information during the natural gas venting process at the reference location includes: The pose information of each of the multiple aircraft is acquired, as well as the detection values ​​of the methane column concentration detection devices carried by each aircraft at each detection time; the pose information includes the pose of the aircraft at each detection time in the multiple detection times. Based on the pose information of each of the aforementioned aircraft, the detection position of the methane column concentration detection device carried by each of the aforementioned aircraft at each detection time is determined; Based on the methane column concentration detection equipment carried by each aircraft at each detection time and the detection location, the detection results at the multiple detection times are determined.

7. An error calibration device for a methane observation satellite, characterized in that, include: Acquisition unit and processing unit; The acquisition unit is used to acquire measurement information and satellite observation information during the natural gas venting process at the reference position; the measurement information includes the detection results of the methane column concentration detection device at multiple detection times, and the detection result at each time time includes the methane column concentration at multiple detection locations in the space above the reference position; the satellite observation information includes methane observation information at the time of satellite overhead. The processing unit is used to fit the methane distribution change information in the space above the reference position based on the detection results at the multiple detection times; the methane distribution change information is used to represent the diffusion pattern of methane and the relationship between column concentration and time at multiple detection positions. The processing unit is further configured to fit satellite observation results of the space above the reference position based on the methane observation information at the time of the overhead crossing; the satellite observation results include the diffusion pattern of methane in the space above the reference position and the column concentration in multiple resolution grids; The processing unit is further configured to calibrate the error information of the satellite's observation of methane based on the information corresponding to the overpass time in the methane distribution change information and the satellite observation results.

8. A computer device, characterized in that, include: A processor connected to a memory for storing computer execution instructions, the processor executing the computer execution instructions stored in the memory to enable the computer device to implement the error calibration method for the methane observation satellite as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, Used to store computer execution instructions, which, when executed on a computer device, cause the computer device to implement the error calibration method for the methane observation satellite as described in any one of claims 1-6.

10. A computer program product, characterized in that, It includes computer execution instructions, which, when executed on a computer device, cause the computer device to implement the error calibration method for the methane observation satellite as described in any one of claims 1-6.

Images