A method and system for online calibration of rain gauge for railway meteorological disaster monitoring

Abstract

The invention provides a method and system for online calibration of a rain gauge for railway meteorological disaster monitoring, and relates to the field of railway equipment. The method comprises: in a standard environment, calibrating a simulated rainfall device in a test area, after calibration, moving the calibrated simulated rainfall device to a calibration position, performing simulated rainfall, obtaining measured rainfall of a rain gauge under test, performing comparison calibration of the rain gauge under test according to a first standard rainfall, or, in a field environment, obtaining real-time environmental information, judging whether it meets the calibration environmental requirements, if so, obtaining a rainfall loss ratio according to the real-time environmental information, controlling the simulated rainfall device to perform simulated rainfall at a standard position, obtaining a second standard rainfall through a standard measuring cylinder, controlling the simulated rainfall device to perform simulated rainfall at the calibration position, obtaining measured rainfall of the rain gauge under test, and performing comparison calibration of the rain gauge under test in combination with the rainfall loss ratio and the second standard rainfall, and the method has the advantage of improving the efficiency of comparison calibration of the rain gauge.

Description

Technical Field

[0001] The invention relates to the field of railway equipment, and in particular to a method and system for online calibration of a rain gauge for railway meteorological disaster monitoring. Background Art

[0002] The rain gauge of the railway meteorological disaster monitoring system is used to monitor rainfall alarm speed limit. To ensure its accurate and reliable measurement, it must be calibrated regularly. The current calibration method requires the establishment of a simulated rain field in the laboratory, which has the following main problems: 1. Since the laboratory requires a high floor (more than 18 meters) and a large area (more than 100 square meters), the construction period is long, the cost is high, and daily maintenance is difficult; 2. The rain gauge needs to be transported to the laboratory by climbing, disassembling, and transporting back and forth, which affects normal use or increases the cost of replacing spare parts, which is time-consuming and labor-intensive and brings operational safety risks; 3. The simulated rain field simulation device of the large laboratory is fixedly installed on the building. Since it is mainly used in water and soil related research, it focuses on controlling the macroscopic mechanical properties of the simulated rain field, and is relatively simple in simulating the microscopic characteristics of raindrops, lacking the flexibility of parameter adjustment means.

[0003] Therefore, a method and system for online calibration of a rain gauge for railway meteorological disaster monitoring is needed, which is used to establish a directional spraying simulated rain field at the rain gauge use site to improve the efficiency of rain gauge comparison and calibration. Summary of the invention

[0004] The present invention provides a method for online calibration of a rain gauge for monitoring railway meteorological disasters, comprising: calibrating a simulated rainfall device in a test area under a standard environment, moving the calibrated simulated rainfall device to a calibration position after the calibration of the simulated rainfall device is completed, controlling the calibrated simulated rainfall device to simulate rainfall at the calibration position, obtaining the measured rainfall of a rain gauge under test, performing comparison calibration of the rain gauge under test according to the measured rainfall of the rain gauge under test and a first standard rainfall, or obtaining real-time environmental information under a field environment, judging whether the real-time environmental information meets the calibration environmental requirements, and if so, obtaining a rainfall loss ratio according to the real-time environmental information, controlling the simulated rainfall device to simulate rainfall at a standard position, obtaining a second standard rainfall through a standard measuring cylinder, controlling the simulated rainfall device to simulate rainfall at the calibration position, obtaining the measured rainfall of the rain gauge under test, and performing comparison calibration of the rain gauge under test according to the measured rainfall of the rain gauge under test, the rainfall loss ratio and the second standard rainfall.

[0005] Furthermore, the calibration of the simulated rainfall device in the test area includes: S11, setting the spraying parameters of the simulated rainfall device; S12, setting a plurality of standard rain gauges in the test area; S13, controlling the simulated rainfall device to simulate rainfall at a preset height, obtaining the indications of a plurality of standard rain gauges and a first simulated rainfall time, judging whether the uniformity requirement is met according to the indications of the plurality of standard rain gauges and the first simulated rainfall time, if so, executing S15, if not, executing S14; S14, adjusting the spraying parameters of the simulated rainfall device, executing S13; S15, controlling the simulated rainfall device to simulate rainfall for multiple times at a preset height, obtaining the indications of a plurality of standard rain gauges in the multiple simulated rainfalls, judging whether the volatility requirement is met according to the indications of the plurality of standard rain gauges in the multiple simulated rainfalls, if so, completing the calibration of the simulated rainfall device, if not, executing S14.

[0006] Furthermore, the spraying parameters include at least the number of nozzles, aperture combinations and / or water pump speed.

[0007] Furthermore, based on the indications of multiple standard rain gauges and the first simulated rainfall time, it is judged whether the uniformity requirement is met, including: determining a first minimum indication value and a first maximum indication value based on the indications of multiple standard rain gauges; calculating a current uniform value based on the first minimum indication value, the first maximum indication value and the first simulated rainfall time; and judging whether the uniformity requirement is met based on the current uniform value.

[0008] Furthermore, judging whether the volatility requirement is met based on the indications of multiple standard rain gauges in multiple simulated rainfalls includes: for each standard rain gauge, determining a second minimum indication value and a second maximum indication value of the standard rain gauge based on the indications of the standard rain gauge in multiple simulated rainfalls, and determining the range of the standard rain gauge based on the second minimum indication value and the second maximum indication value of the standard rain gauge; determining a maximum range based on the range of each standard rain gauge; and judging whether the volatility requirement is met based on the maximum range.

[0009] Furthermore, obtaining the first standard rainfall includes: determining a standard rainfall intensity based on the indications of multiple standard rain gauges in multiple simulated rainfalls and a second simulated rainfall time; obtaining a third simulated rainfall time when the calibrated simulated rainfall device simulates rainfall at a calibration position; and calculating the first standard rainfall based on the standard rainfall intensity and the third simulated rainfall time.

[0010] Furthermore, the calibration environment requirement at least includes that the ambient wind speed is less than a wind speed threshold.

[0011] Furthermore, obtaining the rainfall loss ratio according to the real-time environmental information includes: obtaining test data; establishing a temperature-evaporation relationship model according to the test data; and determining the rainfall loss ratio based on the real-time environmental information through the temperature-evaporation relationship model.

[0012] Furthermore, a comparison and calibration of the rain gauge under test is performed based on the measured rainfall, rainfall loss ratio and second standard rainfall of the rain gauge under test, including: calculating a corrected measured rainfall based on the measured rainfall and rainfall loss ratio of the rain gauge under test; and comparing and calibrating the rain gauge under test based on the corrected measured rainfall and the second standard rainfall.

[0013] The present invention provides a system for online calibration of a rain gauge for monitoring railway meteorological disasters, and uses the above-mentioned method for online calibration of a rain gauge for monitoring railway meteorological disasters, including a rainfall simulation device and a standard device, wherein the standard device at least includes a standard measuring cylinder.

[0014] Compared with the prior art, the method and system for online calibration of a rain gauge for railway meteorological disaster monitoring provided by the present invention have at least the following beneficial effects:

[0015] On-site online calibration is the preferred method, which can reduce costs and improve efficiency, and avoid the problems of conventional laboratory calibration methods. That is, using drones as vehicles to play their basic functions such as load-bearing, mobile positioning, hovering, and height lifting, equipped with calibrated spraying water tanks that can measure and control flow, to establish a directional spraying simulated rain field at the site of rain gauge use. Nearby online detection: The calibration standard equipment is movable and there is no need to disassemble the rain gauge. Online calibration of the in-service rain gauge avoids affecting normal use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0017] Figure 1 It is a flow chart of a method for online calibration of a rain gauge for railway meteorological disaster monitoring according to some embodiments of this specification;

[0018] Figure 2 is a schematic diagram of a plurality of standard rain gauges arranged in a test area according to some embodiments of the present specification;

[0019] Figure 3 It is a module schematic diagram of a system for online calibration of a rain gauge for railway meteorological disaster monitoring according to some embodiments of this specification. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0021] Terminology explanation:

[0022] Value traceability: Property of a measurement result or the value of a measurement standard to be related to a stated reference standard, usually a measurement standard, by an unbroken chain of comparisons with stated uncertainties.

[0023] Calibration: A set of operations to determine, under specified conditions, the relationship between the value indicated by a measuring instrument or measuring system, or the value represented by a physical measure or reference material, and the corresponding value reproduced by a standard.

[0024] Measurement comparison: The process of comparing the values ​​reproduced by the same measuring instruments with the same accuracy level or specified uncertainty range under specified conditions.

[0025] Value verification: Check and verify the value of a measuring instrument to determine whether it is within the allowable error range or meets the relevant measurement requirements.

[0026] In-situ inspection: The rain gauge being calibrated is in service (the equipment is in normal use) and is calibrated on site (movement comparison instrument)

[0027] Transfer standard: A measurement standard used as an intermediate device when comparing two other standards, often used to connect different levels of measurement standard devices.

[0028] Verification standard: A measuring device, product or other object used to collect data by measuring a measurement process in order to control the process.

[0029] Calibration: Use standard measuring instruments to test the accuracy (precision) of the instrument used to see if it meets the standards.

[0030] Rainfall: The depth of rain that falls on the horizontal surface (without leakage, evaporation, loss, etc.) within a certain period of time.

[0031] Rainfall intensity: the average amount of rain falling within a certain period of time. Rainfall intensity = rainfall amount / rainfall duration.

[0032] Raindrop kinetic energy: The energy generated by a raindrop when it falls, calculated based on the size of the raindrop and its falling speed.

[0033] Uniformity refers to the degree of consistency of a characteristic of interest (such as physical value, content, etc.) within the entire range under specified conditions.

[0034] Fluctuation: The unstable and changing characteristics of the measured value or the related characteristics of the measuring instrument due to factors such as time and environmental conditions.

[0035] Simulated rain field: The main design technical parameters are rainfall uniformity, rainfall intensity, raindrop kinetic energy, raindrop diameter and median raindrop distribution. The sprinkler is used as a raindrop generator. This method is divided into single sprinkler, double sprinkler, multi-sprinkler and other forms. Now there are multi-sprinkler combination devices, and the adjustment of the rainfall intensity requires changing sprinklers with different apertures.

[0036] Rainfall intensity: mainly achieved by adjusting flow and controlling pressure. From the two different ways of raindrop generator, firstly, the simulation device with sprinkler as raindrop generator mainly achieves different rainfall intensity effects by selecting different sprinkler combinations and different nozzle diameters.

[0037] Raindrop kinetic energy: It is a major indicator to judge whether simulated rainfall is similar to natural rainfall. It is the similarity of raindrop kinetic energy, that is, the speed of raindrops generated by the rain field when reaching the ground should be similar to the terminal velocity of raindrops in natural rainfall. The distribution of natural raindrop sizes fluctuates between (0 and 6) mm, and its corresponding terminal velocity is (2 to 9) ms. The corresponding drop height required for more than 90% of raindrops is (7 to 9) m. The diameter of raindrops in natural rainfall is generally between (0.1 and 6.0) mm. In order for all raindrops of different sizes to reach their corresponding terminal velocity, the minimum drop height needs to be at least 20.0 m. If only 95% of raindrops reach their corresponding terminal velocity, the minimum drop height can be reduced to (7.0 to 9.0) m. A downspout nozzle with an initial velocity can meet the terminal velocity of (2 to 9) m / s for raindrops of different diameters when the rainfall height reaches 2 m. In addition, no matter what type of rainfall, there are fewer large raindrops and more small raindrops. For example, for a heavy rain with a rainfall intensity of 10mm / h, the number of raindrops with a diameter greater than 1.5mm is less than 2%. Therefore, the installation height of the sprinkler nozzle only needs to meet the requirement that the larger raindrops in the rainfall can reach the terminal velocity when they fall to the ground.

[0038] Figure 1 is a flow chart of a method for online calibration of a rain gauge for railway meteorological disaster monitoring according to some embodiments of this specification, such as Figure 1 As shown in the figure, the calibration of the rain gauge for railway meteorological disaster monitoring can be carried out in two environments, one is the standard environment and the other is the field environment.

[0039] Under a standard environment, the simulated rainfall device is calibrated in the test area. After the calibration of the simulated rainfall device is completed, the calibrated simulated rainfall device is moved to the calibration position, and the calibrated simulated rainfall device is controlled to simulate rainfall at the calibration position to obtain the measured rainfall of the rain gauge under test. According to the measured rainfall of the rain gauge under test and the first standard rainfall, a comparison calibration is performed on the rain gauge under test.

[0040] Under standard conditions, temperature, humidity, atmospheric pressure, wind speed, etc. are all preset values.

[0041] In some embodiments, the simulated rainfall device may include a drone and a water tank disposed on the drone, a stop valve and a metering water pump disposed on the water tank, and a rain shower sprinkler head connected to the water outlet of the metering water pump. When simulated rainfall is required, the metering water pump works, and the metering water pump extracts liquid from the water tank according to preset parameters. The liquid is pressurized by the water pump after passing through the stop valve and transported to the rain shower sprinkler head, and the sprinkler head evenly sprays out the liquid to form a rain shower effect.

[0042] The simulated rainfall device simulates rainfall, and the simulated raindrop landing uniformity, rainfall intensity, raindrop kinetic energy, raindrop diameter and the distribution of the average number of raindrops are in line with natural characteristics. At the same time, the directionality and coverage of the spraying and diffusion should be controlled, and the uniformity and volatility should be guaranteed to meet the requirements of relevant specifications. Due to the complex influence of the simulated rainfall device and the open environment on site (such as the positioning accuracy of the drone, hovering stability, rotation field, the nozzle aperture, distribution and number of the rain sprinkler heads, spray pressure and spray height, environmental conditions (wind direction and speed, atmospheric pressure, temperature and humidity, etc.)) on the spraying simulated rain field, it must be optimized and finalized after debugging and finally calibrated by experiments before it can be used.

[0043] In some embodiments, calibration of a rainfall simulation device is performed in a test area, including:

[0044] S11, setting the spraying parameters of the simulated rainfall device;

[0045] S12. Multiple standard rain gauges are set up in the test area, for example only. Figure 2 is a schematic diagram of multiple standard rain gauges arranged in a test area according to some embodiments of this specification, such as Figure 2 As shown, five standard rain gauges can be set up in the test area, one standard rain gauge is located in the center, and the other four standard rain gauges are set around the standard rain gauge in the center. The standard rain gauge is a standard measuring cylinder that is traceable after calibration by a superior or a rain gauge used as a transfer standard, so as to avoid certain random errors in the measurement results due to factors such as the accidental placement of the position and the uneven distribution of raindrops in the local area (even when trying to simulate a uniform rain field, it is still difficult to completely avoid the unevenness at the micro level). Using five standard rain gauges for multiple experiments, a set of multiple data can be obtained each time. The data of different repeated experiments can be verified and compared with each other, which is convenient for testing the stability and repeatability of the entire calibration process and method. If only one rain gauge is used, it is difficult to fully verify the repeatability of the method from a small number of single measurements, which is not conducive to the calibration process.

[0046] S13, control the simulated rainfall device to simulate rainfall at a preset height, obtain the indications of multiple standard rain gauges and the first simulated rainfall time, and judge whether the uniformity requirement is met according to the indications of multiple standard rain gauges and the first simulated rainfall time. If so, execute S15, if not, execute S14. For example only, the preset height may be 18-20 meters above the test area, and the center position of the rain shower sprinkler head of the simulated rainfall device is located above the position of the central standard rain gauge, ensuring that the surrounding four standard rain gauges are within the spraying range of the rain shower sprinkler head;

[0047] S14, adjusting the spraying parameters of the simulated rainfall device, and executing S13, wherein the spraying parameters at least include the number of nozzles, the aperture combination and / or the water pump speed. Specifically, the number of nozzles refers to the number of nozzles on the rain spray head, and the aperture combination refers to the number and position distribution of nozzles of various apertures (for example, nozzles of 1 mm, 2 mm, 3 mm, etc.) on the rain spray head;

[0048] S15, control the simulated rainfall device to simulate rainfall for multiple times at a preset height, obtain the indications of multiple standard rain gauges in the multiple simulated rainfalls, and determine whether the volatility requirement is met based on the indications of multiple standard rain gauges in the multiple simulated rainfalls. If so, complete the calibration of the simulated rainfall device. If not, execute S14, wherein the timing starts after the rainfall in the simulated rainfall is stable for 30 seconds and stops after 1 minute.

[0049] In some embodiments, judging whether the uniformity requirement is met according to the indications of a plurality of standard rain gauges and the first simulated rainfall time includes:

[0050] Determining a first minimum indication value and a first maximum indication value according to indications of a plurality of standard rain gauges;

[0051] Calculate the current average value according to the first minimum indicated value, the first maximum indicated value and the first simulated rainfall time (e.g., 1 minute);

[0052] According to the current uniformity value, determine whether the uniformity requirement is met.

[0053] Specifically, the current average value can be calculated according to the following formula:

[0054] U=(V max1 -V min1 )÷t1

[0055] Among them, U is the current average value, V max1 is the first maximum value, V min1 is the first minimum indication value, and t1 is the first simulated rainfall time.

[0056] Merely as an example, the uniformity requirements may include: at a rain intensity below 2 mm / min, the current uniform value should not be greater than 0.15 mm; at a rain intensity above 2 mm / min, the current uniform value should not be greater than 0.3 mm.

[0057] In some embodiments, judging whether the volatility requirement is met based on the indications of multiple standard rain gauges in multiple simulated rainfalls includes:

[0058] For each standard rain gauge, determine the minimum second indication value and the maximum second indication value of the standard rain gauge according to the indication value of the standard rain gauge in multiple simulated rainfalls, and determine the range of the standard rain gauge according to the minimum second indication value and the maximum second indication value of the standard rain gauge:

[0059] Based on the range of each standard rain gauge, determine the maximum range;

[0060] Based on the maximum range, determine whether the volatility requirements are met.

[0061] Specifically, the range of the standard rain gauge can be determined according to the following formula:

[0062] R i =(V (max2,i) -V (min2,i) )

[0063] Among them, R i is the range of the ith standard rain gauge, V (max2,i) is the second maximum value of the i-th standard rain gauge, V (min2,i) is the minimum value of the second indication of the ith standard rain gauge.

[0064] The maximum range can be determined according to the following formula:

[0065] R max =max(R i )

[0066] Among them, R max is the maximum range, and max() is the maximum value operation.

[0067] As an example only, the volatility requirements may include that when the rainfall intensity is below 2 mm / min, the volatility should not be greater than 0.1 mm, that is, if the difference between the rainfall at one moment and the rainfall at another moment is greater than 0.1 mm, the volatility of the rain field does not meet the rainfall intensity of 2 mm / min or above, the volatility should not be greater than 0.2 mm.

[0068] After completing the calibration of the simulated rainfall device, move the calibrated simulated rainfall device to the calibration position, where the calibration position is directly above the rain gauge being measured. The calibration position is determined according to the specific online installation height of the rain gauge being measured. For example, if the rainfall height determined by the previous calibration is 18m and the rain gauge is installed at a height of 4m, the calibration position is directly above the rain gauge being measured and 22m from the ground. The parameters of the simulated rainfall device are the parameters after the calibration.

[0069] In some embodiments, obtaining the first standard rainfall includes:

[0070] Determine the standard rainfall intensity according to the indications of the multiple standard rain gauges in multiple simulated rainfalls and the second simulated rainfall time, for example, the standard rainfall intensity = the average of the indications of the multiple standard rain gauges in multiple simulated rainfalls / the second simulated rainfall time;

[0071] Obtaining a third simulated rainfall time (eg, 5 minutes) for the calibrated simulated rainfall device to simulate rainfall at the calibration position;

[0072] The first standard rainfall is calculated according to the standard rainfall intensity and the third simulated rainfall time.

[0073] Specifically, the first standard rainfall (mm) = the third simulated rainfall time (min) × standard rainfall intensity (mm / min).

[0074] According to the measured rainfall of the measured rain gauge and the first standard rainfall, the measured rain gauge is compared and calibrated. When the difference between the measured rainfall of the measured rain gauge and the first standard rainfall is greater than the difference threshold, the measured rain gauge is compared and calibrated and simulated rainfall is performed again to obtain the measured rainfall of the calibrated rain gauge until the difference between the measured rainfall of the calibrated rain gauge and the first standard rainfall is less than or equal to the difference threshold. For piezoelectric and microwave rain gauges, the maximum allowable error is ±0.5mm when the rainfall is not more than 10mm; the maximum allowable error is ±8% when the rainfall is more than 10mm.

[0075] In the field environment, real-time environmental information is obtained to determine whether the real-time environmental information meets the calibration environment requirements. If so, the rainfall loss ratio is obtained according to the real-time environmental information, the simulated rainfall device is controlled to simulate rainfall at the standard position, and the second standard rainfall is obtained through the standard measuring cylinder. The simulated rainfall device is controlled to simulate rainfall at the calibration position, and the measured rainfall of the rain gauge under test is obtained. According to the measured rainfall of the rain gauge under test, the rainfall loss ratio and the second standard rainfall, the rain gauge under test is compared and calibrated. Among them, the field environment refers to the installation environment of the rain gauge under test in service.

[0076] The calibration environment requirement at least includes that the ambient wind speed is less than a wind speed threshold.

[0077] In some embodiments, obtaining the rainfall loss ratio according to the real-time environmental information includes:

[0078] Acquiring test data, wherein the test data may include rainfall data collected by a standard rain gauge under the same spraying parameters and different temperature environments;

[0079] According to the test data, a temperature-evaporation relationship model is established. For example, the temperature-evaporation relationship model is: y=a(△T-20°C), where a is a fitting parameter, y is the rainfall loss ratio, and △T is the difference between the ground temperature and the temperature at the installation height of the measured rain gauge;

[0080] The rainfall loss ratio is determined based on real-time environmental information through a temperature-evaporation relationship model. Specifically, the difference between the ground temperature and the temperature at the installation height of the measured rain gauge can be input into the temperature-evaporation relationship model to obtain the rainfall loss ratio.

[0081] In some embodiments, the measured rain gauge is calibrated based on the measured rainfall, the rainfall loss ratio and the second standard rainfall, including:

[0082] According to the measured rainfall and rainfall loss ratio of the rain gauge under test, the corrected measured rainfall is calculated. It can be understood that compared with the standard rain gauge on the ground, there will be slight deviations in temperature at different heights from the time when raindrops are sprayed from the nozzle to the time when they are collected. In this process, raindrops will lose to different degrees, which will cause the distribution of raindrops that eventually fall into the rain gauge or measuring cylinder to change, thus affecting the calibration process. Therefore, it is necessary to correct the measured rainfall of the rain gauge under test;

[0083] The measured rain gauge is calibrated based on the corrected measured rainfall and the second standard rainfall.

[0084] Specifically, the corrected measured rainfall can be calculated according to the following formula:

[0085] RF t+1 =RF t ×(1+y)

[0086] Among them, RF t+1 is the corrected measured rainfall, RF t is the measured rainfall before correction.

[0087] The measured rainfall of the rain gauge under test is compared and calibrated according to the corrected measured rainfall and the second standard rainfall. When the difference between the corrected measured rainfall and the second standard rainfall is greater than the difference threshold, rainfall is simulated again after the comparison and calibration of the rain gauge under test to obtain the measured rainfall of the calibrated rain gauge under test, until the difference between the corrected measured rainfall and the second standard rainfall of the calibrated rain gauge under test is less than or equal to the difference threshold.

[0088] Figure 3 is a module schematic diagram of a system for online calibration of a rain gauge for railway meteorological disaster monitoring according to some embodiments of this specification, such as Figure 3 As shown, a system for online calibration of a rain gauge for railway meteorological disaster monitoring may include a rainfall simulation device and a standard device, wherein the standard device at least includes a standard measuring cylinder. For piezoelectric and microwave rain gauges, when the rainfall is not more than 10 mm, the maximum allowable error is ±0.5 mm; when the rainfall is more than 10 mm, the maximum allowable error is ±8%.

[0089] It can integrate and optimize the existing maintenance operation methods, expand the use of drone RTK positioning, remote control, video transmission, night vision and other functions, remotely control the piezoelectric and microwave rain gauges installed at a height of 4 meters or automatically perform daily (night) inspections such as close appearance inspections and data transmission tests according to the planned routes.

[0090] A system for online calibration of a rain gauge for monitoring railway meteorological disasters can be used to execute a method for online calibration of a rain gauge for monitoring railway meteorological disasters. For more description of the system for online calibration of a rain gauge for monitoring railway meteorological disasters, please refer to the relevant description of the method for online calibration of a rain gauge for monitoring railway meteorological disasters, which will not be repeated here.

[0091] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, as an example and not a limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

Claims

1. A method for online calibration of a rain gauge for railway meteorological disaster monitoring, characterized in that: include: Under a standard environment, calibrate the simulated rainfall device in the test area. After completing the calibration of the simulated rainfall device, move the calibrated simulated rainfall device to a calibration position, control the calibrated simulated rainfall device to simulate rainfall at the calibration position, obtain the measured rainfall of the measured rain gauge, and perform a comparison calibration of the measured rain gauge according to the measured rainfall of the measured rain gauge and the first standard rainfall, or, In the field environment, real-time environmental information is obtained to determine whether the real-time environmental information meets the calibration environment requirements. If so, the rainfall loss ratio is obtained according to the real-time environmental information, and the simulated rainfall device is controlled to simulate rainfall at the standard position. The second standard rainfall is obtained through the standard measuring cylinder, and the simulated rainfall device is controlled to simulate rainfall at the calibration position to obtain the measured rainfall of the rain gauge under test. The measured rainfall of the rain gauge under test, the rainfall loss ratio and the second standard rainfall are compared and calibrated.

2. The method for online calibration of a rain gauge for railway meteorological disaster monitoring according to claim 1, characterized in that: The calibration of the simulated rainfall device in the test area includes: S11, setting the spraying parameters of the simulated rainfall device; S12. Set up a number of standard rain gauges in the test area; S13, controlling the simulated rainfall device to simulate rainfall at a preset height, obtaining the indications of multiple standard rain gauges and the first simulated rainfall time, and judging whether the uniformity requirement is met according to the indications of the multiple standard rain gauges and the first simulated rainfall time, if so, executing S15, if not, executing S14; S14, adjusting the spraying parameters of the simulated rainfall device, and executing S13; S15. Control the simulated rainfall device to simulate rainfall for multiple times at a preset height, obtain the indications of multiple standard rain gauges in the multiple simulated rainfalls, and determine whether the volatility requirement is met based on the indications of multiple standard rain gauges in the multiple simulated rainfalls. If so, complete the calibration of the simulated rainfall device. If not, execute S14.

3. The method for online calibration of a rain gauge for railway meteorological disaster monitoring according to claim 2, characterized in that: The spraying parameters at least include the number of nozzles, aperture combinations and / or water pump speed.

4. The method for online calibration of a rain gauge for railway meteorological disaster monitoring according to claim 2, characterized in that: According to the indications of multiple standard rain gauges and the first simulated rainfall time, determine whether the uniformity requirements are met, including: Determining a first minimum indication value and a first maximum indication value according to indications of a plurality of standard rain gauges; Calculate the current average value according to the first indicated minimum value, the first indicated maximum value and the first simulated rainfall time; According to the current uniformity value, it is determined whether the uniformity requirement is met.

5. The method for online calibration of a rain gauge for railway meteorological disaster monitoring according to claim 2, characterized in that: According to the indications of multiple standard rain gauges in multiple simulated rainfalls, it is judged whether the volatility requirements are met, including: For each standard rain gauge, according to the indications of the standard rain gauge in multiple simulated rainfalls, determine the second indication minimum value and the second indication maximum value of the standard rain gauge, and according to the second indication minimum value and the second indication maximum value of the standard rain gauge, determine the range of the standard rain gauge; Determining the maximum range based on the range of each of the standard rain gauges; Based on the maximum range, determine whether the volatility requirement is met.

6. The method for online calibration of a rain gauge for railway meteorological disaster monitoring according to claim 2, characterized in that: Get the first standard rainfall, including: Determine the standard rainfall intensity according to the indications of multiple standard rain gauges in multiple simulated rainfalls and the second simulated rainfall time; Obtaining a third simulated rainfall time at which the calibrated simulated rainfall device simulates rainfall at a calibration position; The first standard rainfall amount is calculated according to the standard rainfall intensity and the third simulated rainfall time.

7. A method for online calibration of a rain gauge for railway meteorological disaster monitoring according to any one of claims 1 to 6, characterized in that: The calibration environment requirement at least includes that the ambient wind speed is less than a wind speed threshold.

8. The method for online calibration of a rain gauge for railway meteorological disaster monitoring according to claim 7, characterized in that: Obtaining the rainfall loss ratio according to the real-time environmental information includes: Obtain test data; According to the test data, a temperature-evaporation relationship model is established; The rainfall loss ratio is determined based on the real-time environmental information through a temperature-evaporation relationship model.

9. The method for online calibration of a rain gauge for railway meteorological disaster monitoring according to claim 8, characterized in that: According to the measured rainfall of the measured rain gauge, the rainfall loss ratio and the second standard rainfall, a comparison calibration of the measured rain gauge is performed, including: Calculating the corrected measured rainfall according to the measured rainfall of the measured rain gauge and the rainfall loss ratio; The measured rain gauge is calibrated based on the corrected measured rainfall and the second standard rainfall.

10. A system for online calibration of a rain gauge for railway meteorological disaster monitoring, characterized in that: A method for online calibration of a rain gauge for railway meteorological disaster monitoring using any one of claims 1 to 9 comprises a rainfall simulation device and a standard device, wherein the standard device comprises at least a standard measuring cylinder.

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