Information processing device, information processing method, and program
The information processing device improves displacement calculation accuracy in structures with non-uniform temperature distributions by considering multiple temperature directions and adjusting parameters, addressing inaccuracies in existing PS-InSAR analysis.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2026-03-19
AI Technical Summary
Existing PS-InSAR analysis methods assume uniform temperature distribution in objects, leading to inaccurate displacement calculations for structures with non-uniform temperature distributions, such as water pipe bridges.
An information processing device and method that calculates phase differences in multiple directions, considering both time-series and spatial temperature differences, and adjusts parameters to improve displacement accuracy by projecting these differences onto the irradiation direction.
Enhances the accuracy of displacement calculations in objects with non-uniform temperature distributions by evaluating time-series and spatial temperature difference parameters, allowing for precise estimation of thermal expansion and contraction.
Smart Images
Figure 2026049933000001_ABST
Abstract
Description
[Technical Field]
[0001] This disclosure relates to an information processing device and an information processing method for calculating the displacement of an object, and further relates to a program for implementing these. [Background technology]
[0002] Generally, infrastructure structures such as bridges have a limited lifespan, and in recent years, the deterioration of many infrastructure structures has become a major social problem. Regular inspections are crucial for the maintenance and management of such infrastructure structures, and these inspections are usually carried out manually. However, due to labor shortages, manual inspections have limitations, leading to increased attention on monitoring technologies using various sensors.
[0003] For example, for bridges, a bridge displacement analysis method using satellite synthetic aperture radar (SAR) has been proposed (e.g., Non-Patent Document 1). In bridge displacement analysis using satellite SAR, radio waves are emitted from a satellite towards the bridge at set intervals, and the reflected waves are received. Then, the phase difference between the reflected waves is calculated through interferometry. This phase difference is due to the displacement that occurred in the bridge during the interval between radio wave emission. The phase difference is then converted into displacement using the wavelength of the radio waves.
[0004] Furthermore, this phase difference changes due to the influence of the bridge's temperature, the elapsed time of radio wave irradiation, and the topography of the location where the bridge is installed. For this reason, Non-Patent Literature 1 proposes PS (Persistent Scatterer)-InSAR analysis as a technique for parameter estimation.
[0005] PS-InSAR analysis is a type of interferometric SAR time-series analysis that focuses on points called PS points, where the reflected microwave waves are stable in time, and estimates the time-series changes of these PS points. Specifically, in PS-InSAR analysis, the phase difference Δφ is represented by the following equation 1.
[0006]
number
[0007] In the above number 1, k los The temperature of the object is ΔT air A parameter proportional to v los This parameter is proportional to the elapsed time Δt since the object was irradiated with radio waves. In equation 1 above, λ represents the wavelength of the radio waves emitted from the satellite, and B represents the baseline length (the error in the satellite's orbit). R0 represents the stratrange, i.e., the distance between the satellite and the target object. h This shows the error between DEM (Digital Elevation Model) data and the actual ground height. θ represents the angle between the satellite's line of sight and the vertical direction in the zx plane. △φ noise This indicates the observational noise included in the observed values. [Prior art documents] [Non-patent literature]
[0008] [Non-Patent Document 1] Satoshi Fujiwara et al., “2.5-D surface deformation of M6.1 earthquake near Mt Iwate detected by SAR interferometry”, Geophysical Research Letters, Vol.27, No.14, pp.2049-2052, July 15, 2000. [Non-Patent Document 2] Monserrat, O., Crosetto, M., Cuevas, M., Crippa, B., 2011. The thermal expansion component of persistent scatterer interferometry observations. IEEE Geosci. Remote Sens. Lett. 8 (5), 864-868.
Summary of the Invention
Problems to be Solved by the Invention
[0009] By the way, in the PS-InSAR analysis disclosed in Non-Patent Document 1, assuming that the spatial temperature change of the object is uniform (overall temperature uniformity assumption), a parameter proportional to the temperature is estimated. However, for example, in a water pipe bridge for carrying water, due to the difference in temperature of each member, the behavior of thermal expansion and thermal contraction may be different in the bridge axis direction and the vertical direction. That is, when the members constituting the object have thickness, or when the object holds a substance other than air inside, an event occurs where the temperature distribution of the object is not uniform.
[0010] Therefore, in the PS-InSAR analysis based on the overall temperature uniformity assumption disclosed in Non-Patent Document 1 described above, there is a problem that a parameter proportional to the temperature cannot be accurately estimated for an object with a non-uniform temperature distribution. As a result, in an object with a non-uniform temperature distribution, the accuracy of the displacement calculated using the parameter deteriorates.
[0011] An example of the object of the present disclosure is to improve the calculation accuracy of displacement in an object.
Means for Solving the Problems
[0012] To achieve the above object, an information processing apparatus according to one aspect of the present disclosure a data acquisition unit that acquires irradiation direction phase difference data indicating the amount of displacement in the irradiation direction of the object, generated by irradiating the object with radio waves from a flying object; using the time-series temperature change and the time-series temperature difference parameter in the object, calculates the phase difference in the first direction in the object, and further calculates the value when the calculated phase difference in the first direction is projected onto the irradiation direction, a first phase difference calculation unit; Using the spatial temperature difference and the spatial temperature difference parameter that occur in a second direction different from the first direction in the object, calculate the phase difference in the second direction, and calculate the value when the calculated phase difference in the second direction is projected onto the irradiation direction. A second phase difference calculation unit; Using the displacement amount estimated from the value when the phase difference in the first direction is projected onto the irradiation direction and the value when the phase difference in the second direction is projected onto the irradiation direction, subtract the displacement amount indicated by the irradiation direction phase difference data, and use the obtained difference to evaluate the time-series temperature difference parameter and the spatial temperature difference parameter. A parameter evaluation unit; Characterized by comprising
[0013] Also, to achieve the above object, an information processing method according to one aspect of the present disclosure is A data acquisition step of acquiring irradiation direction phase difference data indicating a displacement amount in the irradiation direction of the object, generated by irradiating the object with radio waves from a flying object; Using the time-series temperature change and the time-series temperature difference parameter in the object, calculate the phase difference in the first direction in the object, and further calculate the value when the calculated phase difference in the first direction is projected onto the irradiation direction. A first phase difference calculation step; Using the spatial temperature difference and the spatial temperature difference parameter that occur in a second direction different from the first direction in the object, calculate the phase difference in the second direction, and calculate the value when the calculated phase difference in the second direction is projected onto the irradiation direction. A second phase difference calculation step; Using the displacement amount estimated from the value when the phase difference in the first direction is projected onto the irradiation direction and the value when the phase difference in the second direction is projected onto the irradiation direction, subtract the displacement amount indicated by the irradiation direction phase difference data, and use the obtained difference to evaluate the time-series temperature difference parameter and the spatial temperature difference parameter. A parameter evaluation step; Characterized by having
[0014] Furthermore, in order to achieve the above objectives, the program in one aspect of this disclosure is On the computer, A data acquisition step involves acquiring irradiation direction phase difference data, which indicates the amount of displacement of the object in the irradiation direction, generated by the irradiation of the object with radio waves from a flying object. A first phase difference calculation step involves calculating the phase difference in a first direction of the object using the time-series temperature change and time-series temperature difference parameter of the object, and further calculating the value obtained by projecting the calculated phase difference in the first direction onto the irradiation direction. A second phase difference calculation step, which involves calculating a phase difference in the second direction using a spatial temperature difference and spatial temperature difference parameter that occur in a second direction different from the first direction in the object, and calculating the value when the calculated phase difference in the second direction is projected onto the irradiation direction, A parameter evaluation step in which the time-series temperature difference parameter and the spatial temperature difference parameter are evaluated using the difference obtained by subtracting the displacement amount indicated by the irradiation direction phase difference data from the displacement amount estimated using the value obtained when the phase difference in the first direction is projected onto the irradiation direction and the value obtained when the phase difference in the second direction is projected onto the irradiation direction, It is characterized by causing the execution of [the specified action]. [Effects of the Invention]
[0015] As described above, this disclosure makes it possible to improve the accuracy of calculating displacement in the object. [Brief explanation of the drawing]
[0016] [Figure 1] Figure 1 is a schematic diagram showing an example of an information processing device. [Figure 2] Figure 2 is a diagram illustrating the configuration of an example of an information processing device. [Figure 3] Figure 3 shows an example of the object. [Figure 4]Figure 4 shows the displacement of the object at the reflection point corresponding to the phase difference data of the irradiation direction. [Figure 5] Figure 5 shows an example of line-of-situ displacement (LOS displacement) measured by an artificial satellite. [Figure 6] Figure 6 is a flowchart illustrating an example of the operation of an information processing device. [Figure 7] Figure 7 is a block diagram showing an example of a computer that implements an information processing device. [Modes for carrying out the invention]
[0017] (Embodiment) The information processing device, information processing method, and program in the embodiment will be described below with reference to Figures 1 to 7.
[0018] [Device configuration] First, we will explain the schematic configuration of an example of an information processing device using Figure 1. Figure 1 is a configuration diagram showing the schematic configuration of an example of an information processing device.
[0019] The information processing device 10 shown in Figure 1 is a device used to calculate the displacement of an object. As shown in Figure 1, the information processing device 10 comprises a data acquisition unit 11, a first phase difference calculation unit 12, a second phase difference calculation unit 13, and a parameter evaluation unit 14.
[0020] The data acquisition unit 11 acquires irradiation direction phase difference data, which indicates the amount of displacement of the object in the direction of irradiation, generated by the irradiation of the object with radio waves from the flying object.
[0021] The first phase difference calculation unit 12 calculates the phase difference in a first direction on the object using the time-series temperature change and time-series temperature difference parameter on the object. Furthermore, the first phase difference calculation unit 12 calculates the value obtained by projecting the calculated phase difference in the first direction onto the irradiation direction (hereinafter referred to as the "first irradiation direction projected value").
[0022] The second phase difference calculation unit 13 calculates the phase difference in the second direction using the spatial temperature difference and spatial temperature difference parameter that occur in the object in a second direction different from the first direction. Furthermore, the second phase difference calculation unit 13 calculates the value obtained by projecting the calculated phase difference in the second direction onto the irradiation direction (hereinafter referred to as the "second irradiation direction projection value").
[0023] The parameter evaluation unit 14 evaluates the time-series temperature difference parameter and the spatial temperature difference parameter using the difference obtained by subtracting the displacement amount indicated by the irradiation direction phase difference data from the displacement amount estimated using the first irradiation direction projection value and the second irradiation direction projection value.
[0024] Thus, the information processing device 10 uses, as a parameter for temperature, a time-series temperature difference parameter proportional to the temperature of the object, as well as a spatial temperature difference parameter proportional to the spatial temperature difference of the object, and evaluates these two parameters. Therefore, by performing PS-InSAR analysis using the information processing device 10, the displacement of the object can be calculated with high accuracy. The information processing device 10 makes it possible to improve the accuracy of calculating the displacement of the object.
[0025] Next, the configuration and function of Embodiment 1 will be specifically explained using Figures 2 to 5. Figure 2 is a configuration diagram specifically showing the configuration of an example of an information processing device. Figure 3 is a diagram showing an example of an object. Figure 4 is a diagram showing the displacement of the object at the reflection point corresponding to the irradiation direction phase difference data. Figure 5 is a diagram showing an example of irradiation direction displacement (LOS displacement) measured by an artificial satellite.
[0026] As shown in Figure 2, the information processing device 10 includes, in addition to the data acquisition unit 11, the first phase difference calculation unit 12, the second phase difference calculation unit 13, and the parameter evaluation unit 14 described above, a displacement amount estimation unit 15, a parameter update unit 16, and a specific displacement amount estimation unit 17.
[0027] Furthermore, as shown in Figure 2, in this embodiment, the flying object is an artificial satellite 20 and the object is a bridge 30. As shown in Figure 3, the first direction of the object, the bridge 30, is the bridge axis direction (x direction), and the second direction is the vertical direction (z direction). Moreover, the bridge 30 shown in Figure 3 is a water pipe bridge for transporting water. Unlike ordinary bridges, a water pipe bridge has a temperature difference between the water pipe section and the arch section due to its structure. In Figure 3, the temperature of the water pipe section is indicated by T1, and the temperature of the arch section is indicated by T2.
[0028] Furthermore, as shown in Figure 4, the irradiation direction phase difference data created from satellite images transmitted from satellite 20 corresponds to the LOS displacement for each reflection point 31 analyzed by satellite SAR. In Figure 3, the dashed arrows indicate the irradiation direction of radio waves from satellite 20, and the solid arrows indicate the orbit of satellite 20.
[0029] As shown in Figure 5, the line-of-sight (LOS) displacement is the displacement in the direction of the satellite's line of sight (irradiation direction). On the other hand, the displacements that can be determined are the displacement of the bridge 30 in the bridge axis direction and the vertical direction. Also, in Figure 5, the bridge 30 is shown as a model. In the example in Figure 5, the bridge 30 deforms due to thermal expansion or contraction, and this causes displacement.
[0030] Furthermore, the satellite 20 transmits satellite images to the base at a set time or periodically. The satellite images received by the base are processed into data representing the phase difference of pixels over observation days in the direction of the satellite's radio wave irradiation, and are stored in the database 21 as shown in Figure 2. The irradiation direction phase difference data also has an observation time, and the stored irradiation direction phase difference data is time-series data.
[0031] In this embodiment, the data acquisition unit 11 acquires irradiation direction phase difference data at each reflection point of the bridge 30 from the database 21. Since irradiation direction displacement data is acquired for each reflection point in this way, the processing by the first phase difference calculation unit 12, the second phase difference calculation unit 13, and the displacement amount estimation unit 15, which will be described later, is performed for each reflection point.
[0032] In addition, the database 21 stores the temperature T1 of the water pipe portion and the temperature T2 of the arch portion in the bridge 30 in time series. Therefore, the data acquisition unit 11 also acquires the time series data of the temperature T1 of the water pipe portion and the temperature T2 of the arch portion. In addition, the database 21 stores data required for the estimation processes in the displacement amount estimation unit 15 and the specific displacement amount estimation unit 17 described later. The data acquisition unit also acquires data required for the estimation processes in the displacement amount estimation unit 15 and the specific displacement amount estimation unit 17.
[0033] The first phase difference calculation unit 12 acquires, from the data acquisition unit 11, the time series data of the temperature T1 of the water pipe portion shown in FIG. 3 as the time series temperature change in the bridge 30, and calculates the temperature change ΔT1. Then, the first phase difference calculation unit 12 uses the time series temperature change ΔT1 of the bridge 30 and the time series temperature difference parameter k x and calculates the phase difference Δφ x in the bridge axis direction of the bridge 30 according to the following formula (2). Further, the first phase difference calculation unit 12 calculates the value (first irradiation direction projection value) Δφ x when the phase difference Δφ xpro is projected in the irradiation direction according to the following formula (3). λ represents the wavelength of the radio wave irradiated from the satellite.
[0034]
Formula
[0035]
Formula
[0036] The second phase difference calculation unit 13 acquires the time series data of the temperature T1 of the water pipe portion and the temperature T2 of the arch portion from the data acquisition unit 11, and calculates “ΔT2 - ΔT1” as the spatial temperature difference generated in the vertical direction of the bridge 30. Then, the second phase difference calculation unit 13 uses “ΔT2 - ΔT1” and the spatial temperature difference parameter k zUsing the above, the following equation 4 gives the vertical phase difference △φ of the bridge 30. z The second phase difference calculation unit 13 calculates the phase difference △φ according to the following equation 5. z The value when projected in the direction of irradiation (second irradiation direction projection value) △φ zpro Calculate.
[0037]
number
[0038]
number
[0039] The displacement estimation unit 15 calculates the first irradiation direction projection value △φ xpro And the second irradiation direction projection value △φ zpro The displacement amount (estimated displacement amount △φ hat) in the direction of illumination of the bridge is estimated using the following equation 6. Specifically, the displacement amount estimation unit 15 estimates the displacement amount (estimated displacement amount △φ hat) in the direction of illumination using the following equation 6.
[0040]
number
[0041] In the above number 6, similar to number 1 shown in the background technology section, v los This parameter is proportional to the elapsed time △t since the object was irradiated with radio waves. Also, similar to equation 1 above, B represents the baseline length (error in the satellite's orbit), and R0 represents the stratrange, i.e., the distance between the satellite and the target object. Similar to equation 1 above, θ represents the angle between the line of sight of the artificial satellite and the vertical direction in the zx plane, and △ h This shows the error between DEM (Digital Elevation Model) data and the actual ground height.
[0042] As shown in Equation 7 below, the parameter evaluation unit 14 calculates the difference α by subtracting the displacement amount △φ indicated by the irradiation direction phase difference data from the displacement amount estimated by the displacement amount estimation unit 15 (estimated displacement amount △φ hat).
[0043]
number
[0044] Furthermore, the parameter evaluation unit 14 uses the calculated difference α to calculate an evaluation value in which the larger the difference α, the greater the value. Specifically, the parameter evaluation unit 14 calculates the evaluation value E using, for example, the following equation 8.
[0045]
number
[0046] The parameter update unit 16 adjusts the time-series temperature difference parameter k so that the evaluation value E becomes smaller. x The value of and the spatial temperature difference parameter k z The values of are updated. Examples of parameter update methods include PSO (Particle Swarm Optimization) and the Metropolis-Hastings method in MCMC (Markov Chain Monte Carlo).
[0047] When the parameter update unit 16 performs the update, the processing described above is carried out in the first phase difference calculation unit 12, the second phase difference calculation unit 13, the displacement amount estimation unit 15, and the parameter evaluation unit 14. After that, the parameter update unit 16 again checks the time-series temperature difference parameter k x The value of and the spatial temperature difference parameter k z The value of is updated. This series of processes is performed multiple times, and the time-series temperature difference parameter k x and spatial temperature difference parameter k z This is the appropriate value.
[0048] The specific displacement estimation unit 17 uses the time-series temperature difference parameter k, which has been updated multiple times by the parameter update unit 16. xand spatial temperature difference parameter k z Using this, the displacement amount dx in the bridge axis direction of the bridge 30 and the displacement amount dz in the vertical direction of the bridge 30 are estimated. The specific displacement amount estimation unit 17 also outputs the estimated displacement amounts dx and dz to the user's terminal device 40.
[0049] Specifically, the specific displacement estimation unit 17 can estimate the displacement amounts dx and dz using the displacement analysis (2.5-dimensional analysis) disclosed in the references listed below. Alternatively, the specific displacement estimation unit 17 can also estimate the displacement amounts dx and dz by modeling them.
[0050] [References] Satoshi Fujiwara et al., “2.5-D surface deformation of M6.1 earthquake near Mt Iwate detected by SAR interferometry”, Geophysical Research Letters, Vol.27, No.14, pp.2049-2052, July 15, 2000.
[0051] [Device operation] Next, an example of the operation of the information processing device 10 will be explained using Figure 6. Figure 6 is a flowchart showing an example of the operation of the information processing device. In the following explanation, Figures 1 to 5 will be referred to as appropriate. In this embodiment, the information processing method is implemented by operating the information processing device 10. Therefore, the explanation of the information processing method in this embodiment will be replaced by the following explanation of the operation of the information processing device 10.
[0052] As shown in Figure 6, first, the data acquisition unit 11 acquires from the database 21 the irradiation direction displacement data at each reflection point of the bridge 30 and time-series data of the temperature of the bridge 30 (step A1).
[0053] Specifically, the time-series data for the temperature of the bridge 30 consists of time-series data for the temperature T1 of the water pipe section and time-series data for the temperature T2 of the arch section. The data acquisition unit also acquires data necessary for the estimation process in the displacement estimation unit 15 and the specific displacement estimation unit 17 from the database 21.
[0054] Next, the first phase difference calculation unit 12 calculates the phase difference in the bridge axis direction using the time-series temperature change and time-series temperature difference parameter in the bridge 30, and projects the calculated phase difference in the bridge axis direction into the irradiation direction to calculate the first irradiation direction projection value (step A2).
[0055] Specifically, in step A2, the first phase difference calculation unit 12 first acquires time-series data of the temperature T1 of the water pipe section shown in Figure 3 as the time-series temperature change at the bridge 30 from the data acquisition unit 11, and calculates the temperature change ΔT1. Then, the first phase difference calculation unit 12 calculates the time-series temperature change ΔT1 of the bridge 30 and the time-series temperature difference parameter k x Using this, and according to the above equation 2, the phase difference △φ in the bridge axis direction of the bridge 30 is obtained. x The first phase difference calculation unit 12 calculates the first irradiation direction projection value △φ using the above equation 3. xpro Calculate.
[0056] Next, the second phase difference calculation unit 13 calculates the phase difference in the vertical direction using the spatial temperature difference and spatial temperature difference parameter that occur in the vertical direction of the bridge 30, and projects the calculated vertical phase difference in the irradiation direction to calculate the second irradiation direction projection value (step A3).
[0057] Specifically, in step A3, the second phase difference calculation unit 13 first acquires time-series data of the temperature T1 of the water pipe section and the temperature T2 of the arch section from the data acquisition unit 11, and calculates "△T2-△T1" as the spatial temperature difference occurring in the vertical direction of the bridge 30. Then, the second phase difference calculation unit 13 calculates "△T2-△T1" and the spatial temperature difference parameter k z Using the above equation 4, the phase difference △φ in the vertical direction of the bridge 30 is obtained. zThe second phase difference calculation unit 13 calculates the second irradiation direction projection value △φ using the above number 5. zpro Calculate.
[0058] Next, the displacement estimation unit 15 estimates the displacement of the bridge in the direction of illumination using the first illumination direction projection value and the second illumination direction projection value (step A4). Specifically, the displacement estimation unit 15 uses the first illumination direction projection value △φ xpro And the second irradiation direction projection value △φ zpro Applying this to equation 6 above, we estimate the displacement amount in the irradiation direction (estimated displacement amount △φ hat).
[0059] Next, the parameter evaluation unit 14 evaluates the time-series temperature difference parameter k x and spatial temperature difference parameter k z Determine whether the update has been performed a predetermined number of times (Step A5).
[0060] If the result of the determination in step A5 is that the update has not been performed a predetermined number of times (step A5: No), the parameter evaluation unit 14 calculates an evaluation value that shows the difference between the displacement amount estimated in step A4 and the displacement amount indicated by the irradiation direction phase difference data acquired in step A1 (step A6).
[0061] Specifically, in step A6, the parameter evaluation unit 14 calculates the difference α by subtracting the displacement amount △φ indicated by the irradiation direction phase difference data from the estimated displacement amount (estimated displacement amount △φ hat) as shown in equation 7 above. Then, the parameter evaluation unit 14 applies the calculated difference α to equation 7 above to calculate the evaluation value E.
[0062] Next, the parameter update unit 16 updates the values of the time-series temperature difference parameter and the spatial temperature difference parameter so that the evaluation value becomes smaller (step A7). Once step A7 is executed, steps A2 to A5 are executed again using the updated parameters.
[0063] On the other hand, if the result of the determination in step A5 indicates that the update has been performed a predetermined number of times (step A5: Yes), the specific displacement amount estimation unit 17 uses the time-series temperature difference parameter and spatial temperature difference parameter, which have been updated a predetermined number of times, to estimate the displacement amount dx in the bridge axis direction of the bridge 30 and the displacement amount dz in the vertical direction of the bridge 30 (step A8).
[0064] Subsequently, the specific displacement estimation unit 17 outputs the displacement amounts dx and dz estimated in step A8 to the user's terminal device 40 (step A9).
[0065] [Effects in the embodiment] In this way, the information processing device 10 can obtain time-series temperature difference parameters and spatial temperature difference parameters with high accuracy. Therefore, even if the vertical temperature distribution in the bridge 30 is not uniform, the information processing device 10 can calculate the displacement amount in the bridge axis direction and the displacement amount in the vertical direction of the bridge 30 with high accuracy.
[0066] Furthermore, although only two temperatures are used in the example described above, this disclosure is not limited to this. Three or more temperatures may be used, in which case two or more spatial temperature difference parameters will be set.
[0067] Furthermore, while the above example shows the use of irradiation direction displacement difference data generated by radio waves emitted from an artificial satellite, the data in this disclosure is not limited to irradiation direction displacement data. The data can be any data that shows the observed displacement amount, for example, data that shows the displacement amount detected from an image of the target.
[0068] [program] The program in this embodiment can be any program that causes a computer to execute steps A1 to A9 shown in Figure 6. By installing and executing this program on a computer, the information processing device 10 and the information processing method can be realized. In this case, the computer's processor functions as a data acquisition unit 11, a first phase difference calculation unit 12, a second phase difference calculation unit 13, a parameter evaluation unit 14, a displacement amount estimation unit 15, a parameter update unit 16, and a specific displacement amount estimation unit 17, and performs the processing. In addition to general-purpose PCs and server computers, smartphones and tablet terminal devices can also be used as computers.
[0069] Furthermore, the program in the embodiment may be executed by a computer system constructed by multiple computers. In this case, for example, each computer may function as one of the following: a data acquisition unit 11, a first phase difference calculation unit 12, a second phase difference calculation unit 13, a parameter evaluation unit 14, a displacement amount estimation unit 15, a parameter update unit 16, and a specific displacement amount estimation unit 17.
[0070] [Physical configuration] Here, a computer that implements the information processing device 10 by executing the program in the embodiment will be described using Figure 7. Figure 7 is a block diagram showing an example of a computer that implements the information processing device.
[0071] As shown in Figure 7, the computer 110 comprises a CPU (Central Processing Unit) 111, main memory 112, storage device 113, input interface 114, display controller 115, data reader / writer 116, and communication interface 117. Each of these components is connected to the others via a bus 121, enabling data communication.
[0072] Furthermore, the computer 110 may include a GPU (Graphics Processing Unit) or an FPGA (Field-Programmable Gate Array) in addition to, or instead of, the CPU 111. In this embodiment, the GPU or FPGA can execute the program in the embodiment.
[0073] The CPU 111 loads the program in the embodiment, which consists of a set of codes stored in the storage device 113, into the main memory 112, and performs various calculations by executing each code in a predetermined order. The main memory 112 is typically a volatile storage device such as DRAM (Dynamic Random Access Memory).
[0074] Furthermore, the program in this embodiment is provided stored on a computer-readable recording medium 120. The program in this embodiment may also be distributed over the internet via a communication interface 117.
[0075] Specific examples of the storage device 113 include hard disk drives and semiconductor storage devices such as flash memory. The input interface 114 mediates data transmission between the CPU 111 and input devices 118 such as a keyboard and mouse. The display controller 115 is connected to the display device 119 and controls the display on the display device 119.
[0076] The data reader / writer 116 mediates data transmission between the CPU 111 and the recording medium 120, reads programs from the recording medium 120, and writes processing results from the computer 110 to the recording medium 120. The communication interface 117 mediates data transmission between the CPU 111 and other computers.
[0077] Furthermore, specific examples of the recording medium 120 include general-purpose semiconductor memory devices such as CF (Compact Flash®) and SD (Secure Digital), magnetic recording media such as Flexible Disks, or optical recording media such as CD-ROMs (Compact Disk Read Only Memory).
[0078] Furthermore, the information processing device 10 can be implemented not only by a computer on which a program is installed, but also by using hardware corresponding to each part, such as electronic circuits. Moreover, the information processing device 10 may be partially implemented by a program and the remaining part by hardware. In this embodiment, the computer is not limited to the computer shown in Figure 7.
[0079] Some or all of the embodiments described above can be expressed by (Appendix 1) to (Appendix 12) described below, but are not limited to the following descriptions.
[0080] (Note 1) A data acquisition unit acquires irradiation direction phase difference data, which indicates the amount of displacement of the object in the irradiation direction, generated by the irradiation of an object with radio waves from a flying object. A first phase difference calculation unit calculates the phase difference in a first direction of the object using the time-series temperature change and time-series temperature difference parameter of the object, and further calculates the value obtained by projecting the calculated phase difference in the first direction onto the irradiation direction. A second phase difference calculation unit calculates a phase difference in the second direction using a spatial temperature difference and spatial temperature difference parameter that occur in a second direction different from the first direction in the object, and calculates the value when the calculated phase difference in the second direction is projected onto the irradiation direction. A parameter evaluation unit evaluates the time-series temperature difference parameter and the spatial temperature difference parameter using the difference obtained by subtracting the displacement amount indicated by the irradiation direction phase difference data from the displacement amount estimated using the value obtained when the phase difference in the first direction is projected onto the irradiation direction and the value obtained when the phase difference in the second direction is projected onto the irradiation direction, An information processing device characterized by having the following features.
[0081] (Note 2) The system further includes a parameter update unit that updates the values of the time-series temperature difference parameter and the spatial temperature difference parameter using the results of the evaluation. The information processing apparatus according to claim 1.
[0082] (Note 3) The parameter evaluation unit calculates an evaluation value that increases as the difference increases, The parameter update unit updates the values of the time-series temperature difference parameter and the spatial temperature difference parameter so that the evaluation value becomes smaller. The information processing apparatus according to claim 2.
[0083] (Note 4) The aforementioned object is a bridge, The first direction is the bridge axis direction, The second direction is the vertical direction. The information processing apparatus according to claim 1.
[0084] (Note 5) A data acquisition step involves acquiring irradiation direction phase difference data, which indicates the amount of displacement of the object in the irradiation direction, generated by the irradiation of the object with radio waves from a flying object. A first phase difference calculation step involves calculating the phase difference in a first direction of the object using the time-series temperature change and time-series temperature difference parameter of the object, and further calculating the value obtained by projecting the calculated phase difference in the first direction onto the irradiation direction. A second phase difference calculation step, which involves calculating a phase difference in the second direction using a spatial temperature difference and spatial temperature difference parameter that occur in a second direction different from the first direction in the object, and calculating the value when the calculated phase difference in the second direction is projected onto the irradiation direction, A parameter evaluation step in which the time-series temperature difference parameter and the spatial temperature difference parameter are evaluated using the difference obtained by subtracting the displacement amount indicated by the irradiation direction phase difference data from the displacement amount estimated using the value obtained when the phase difference in the first direction is projected onto the irradiation direction and the value obtained when the phase difference in the second direction is projected onto the irradiation direction, An information processing method characterized by having the following:
[0085] (Note 6) The system further includes a parameter update step in which the values of the time-series temperature difference parameter and the spatial temperature difference parameter are updated using the results of the evaluation. The information processing method according to claim 5.
[0086] (Note 7) In the parameter evaluation step, an evaluation value is calculated in which the larger the difference, In the parameter update step, the values of the time-series temperature difference parameter and the spatial temperature difference parameter are updated so that the evaluation value becomes smaller. The information processing method according to claim 6.
[0087] (Note 8) The aforementioned object is a bridge, The first direction is the bridge axis direction, The second direction is the vertical direction. The information processing method according to claim 5.
[0088] (Note 9) On the computer, A data acquisition step involves acquiring irradiation direction phase difference data, which indicates the amount of displacement of the object in the irradiation direction, generated by the irradiation of the object with radio waves from a flying object. A first phase difference calculation step involves calculating the phase difference in a first direction of the object using the time-series temperature change and time-series temperature difference parameter of the object, and further calculating the value obtained by projecting the calculated phase difference in the first direction onto the irradiation direction. A second phase difference calculation step, which involves calculating a phase difference in the second direction using a spatial temperature difference and spatial temperature difference parameter that occur in a second direction different from the first direction in the object, and calculating the value when the calculated phase difference in the second direction is projected onto the irradiation direction, A parameter evaluation step in which the time-series temperature difference parameter and the spatial temperature difference parameter are evaluated using the difference obtained by subtracting the displacement amount indicated by the irradiation direction phase difference data from the displacement amount estimated using the value obtained when the phase difference in the first direction is projected onto the irradiation direction and the value obtained when the phase difference in the second direction is projected onto the irradiation direction, A program that executes something.
[0089] (Note 10) The system further includes a parameter update step in which the values of the time-series temperature difference parameter and the spatial temperature difference parameter are updated using the results of the evaluation. The program according to claim 9.
[0090] (Note 11) In the parameter evaluation step, an evaluation value is calculated in which the larger the difference, In the parameter update step, the values of the time-series temperature difference parameter and the spatial temperature difference parameter are updated so that the evaluation value becomes smaller. The program according to claim 10.
[0091] (Note 12) The aforementioned object is a bridge, The first direction is the bridge axis direction, The second direction is the vertical direction. The program according to claim 9. [Industrial applicability]
[0092] As described above, this disclosure makes it possible to improve the accuracy of calculating displacement in an object. This disclosure is useful, for example, in systems that perform analysis of infrastructure structures. [Explanation of Symbols]
[0093] 10 Information Processing Devices 11 Data Acquisition Unit 12 First phase difference calculation unit 13 Second phase difference calculation unit 14 Parameter Evaluation Unit 15 Displacement Estimation Unit 16 Parameter update section 17. Specific displacement estimation unit 20 satellite 21 Databases 30 Bridges 40 Terminal devices 110 Computer 111 CPU 112 Main Memory 113 Storage device 114 Input Interface 115 Display Controller 116 Data Readers / Writers 117 Communication Interface 118 Input devices 119 Display device 120 recording media 121 Bus
Claims
1. A data acquisition unit acquires irradiation direction phase difference data, which indicates the amount of displacement of the object in the irradiation direction, generated by the irradiation of an object with radio waves from a flying object. A first phase difference calculation unit calculates the phase difference in a first direction of the object using the time-series temperature change and time-series temperature difference parameter of the object, and further calculates the value when the calculated phase difference in the first direction is projected in the irradiation direction. A second phase difference calculation unit calculates a phase difference in the second direction using a spatial temperature difference and spatial temperature difference parameter that occur in a second direction different from the first direction in the object, and calculates the value when the calculated phase difference in the second direction is projected in the irradiation direction. A parameter evaluation unit evaluates the time-series temperature difference parameter and the spatial temperature difference parameter using the difference obtained by subtracting the displacement amount indicated by the irradiation direction phase difference data from the displacement amount estimated using the value obtained when the phase difference in the first direction is projected onto the irradiation direction and the value obtained when the phase difference in the second direction is projected onto the irradiation direction, An information processing device characterized by having the following features.
2. The system further includes a parameter update unit that updates the values of the time-series temperature difference parameter and the spatial temperature difference parameter using the results of the evaluation. The information processing apparatus according to claim 1.
3. The parameter evaluation unit calculates an evaluation value that increases as the difference increases, The parameter update unit updates the values of the time-series temperature difference parameter and the spatial temperature difference parameter so that the evaluation value becomes smaller. The information processing apparatus according to claim 2.
4. The aforementioned object is a bridge, The first direction is the bridge axis direction, The second direction is the vertical direction. The information processing apparatus according to claim 1.
5. A data acquisition step involves acquiring irradiation direction phase difference data, which indicates the amount of displacement of the object in the irradiation direction, generated by the irradiation of the object with radio waves from a flying object. A first phase difference calculation step involves calculating the phase difference in a first direction of the object using the time-series temperature change and time-series temperature difference parameter of the object, and further calculating the value obtained by projecting the calculated phase difference in the first direction onto the irradiation direction. A second phase difference calculation step, which involves calculating a phase difference in the second direction using a spatial temperature difference and spatial temperature difference parameter that occur in a second direction different from the first direction in the object, and calculating the value when the calculated phase difference in the second direction is projected in the irradiation direction, A parameter evaluation step in which the time-series temperature difference parameter and the spatial temperature difference parameter are evaluated using the difference obtained by subtracting the displacement amount indicated by the irradiation direction phase difference data from the displacement amount estimated using the value obtained when the phase difference in the first direction is projected onto the irradiation direction and the value obtained when the phase difference in the second direction is projected onto the irradiation direction, An information processing method characterized by having the following:
6. The system further includes a parameter update step in which the values of the time-series temperature difference parameter and the spatial temperature difference parameter are updated using the results of the evaluation. The information processing method according to claim 5.
7. In the parameter evaluation step, an evaluation value is calculated in which the larger the difference, In the parameter update step, the values of the time-series temperature difference parameter and the spatial temperature difference parameter are updated so that the evaluation value becomes smaller. The information processing method according to claim 6.
8. The aforementioned object is a bridge, The first direction is the bridge axis direction, The second direction is the vertical direction. The information processing method according to claim 5.
9. On the computer, A data acquisition step involves acquiring irradiation direction phase difference data, which indicates the amount of displacement of the object in the irradiation direction, generated by the irradiation of the object with radio waves from a flying object. A first phase difference calculation step involves calculating the phase difference in a first direction of the object using the time-series temperature change and time-series temperature difference parameter of the object, and further calculating the value obtained by projecting the calculated phase difference in the first direction onto the irradiation direction. A second phase difference calculation step, which involves calculating a phase difference in the second direction using a spatial temperature difference and spatial temperature difference parameter that occur in a second direction different from the first direction in the object, and calculating the value when the calculated phase difference in the second direction is projected in the irradiation direction, A parameter evaluation step in which the time-series temperature difference parameter and the spatial temperature difference parameter are evaluated using the difference obtained by subtracting the displacement amount indicated by the irradiation direction phase difference data from the displacement amount estimated using the value obtained when the phase difference in the first direction is projected onto the irradiation direction and the value obtained when the phase difference in the second direction is projected onto the irradiation direction, A program that executes something.
10. The system further includes a parameter update step in which the values of the time-series temperature difference parameter and the spatial temperature difference parameter are updated using the results of the evaluation. The program according to claim 9.
11. In the parameter evaluation step, an evaluation value is calculated in which the larger the difference, In the parameter update step, the values of the time-series temperature difference parameter and the spatial temperature difference parameter are updated so that the evaluation value becomes smaller. The program according to claim 10.
12. The aforementioned object is a bridge, The first direction is the bridge axis direction, The second direction is the vertical direction. The program according to claim 9.