Hybrid technology based method of recognizing supercooled water area by using threshold method

A technology for area identification and supercooled water, which is applied in the re-radiation of electromagnetic waves, reflection/re-radiation of radio waves, instruments, etc., can solve the problem of serious attenuation of lidar, achieve intuitive effects, easy to use, improve calculation speed and use efficiency effect

Pending Publication Date: 2019-07-26
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the lidar can be used to identify the supercooled water layer in the cloud, but due to the serious attenuation of the lidar, the lidar can only identify the bottom of the supercooled water layer

Method used

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  • Hybrid technology based method of recognizing supercooled water area by using threshold method
  • Hybrid technology based method of recognizing supercooled water area by using threshold method
  • Hybrid technology based method of recognizing supercooled water area by using threshold method

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Embodiment 1

[0029] This embodiment adopts a method for identifying supercooled water regions based on the threshold method provided by the present invention, such as figure 1 shown, including the following steps:

[0030] Step 1: Read the radiosonde data through Matlab, and then select the area with a temperature of -40°C to 0°C, and define it as an area where supercooled water may exist;

[0031] Step 2: Read the lidar data through Matlab, and select the area where supercooled water may exist in step 1 that meets the requirement that the lidar backscatter coefficient is greater than 5×10 -5 1 / (m·sr), and define it as the supercooled water layer region; this step is suitable for the situation when there is no large turbulence and wind shear.

[0032] Step 3: Read the millimeter-wave radar data through Matlab, select an area in the supercooled water layer area in step 2 that satisfies the millimeter-wave radar spectral width greater than 0.4m / s and the linear depolarization ratio LDR les...

Embodiment 2

[0036] This embodiment adopts a method for identifying supercooled water regions based on the threshold method provided by the present invention. On the basis of using the Matlab algorithm in combination with laser radar, millimeter wave radar and sounding temperature data to obtain the supercooled water region image, adopt Matlab and Java hybrid technology improves recognition efficiency and flexibility, optimizes user experience, provides convenience for aviation weather to identify areas with supercooled water, and avoids aviation safety accidents caused by icing of aircraft. The specific steps are as follows:

[0037] 1) Write the relevant M file of the threshold method algorithm in Matlab, read in the radar data and sounding temperature data, perform data recognition, and use the output image as the recognition result, and package the M file into a JAR package, that is, a JAR file ;

[0038] 2) Create a Java project, edit a main window class MainFrame, set the properties...

Embodiment 3

[0055] This embodiment adopts a method for identifying a subcooled water area based on a hybrid technology based on a threshold method provided by the present invention, which includes the following steps:

[0056] Step 1: The relevant variables in the millimeter-wave radar, lidar, and radiosonde data files are stored in the form of arrays. Read the variables "time (time)", "rang (height)" and "width (spectrum width)" in the millimeter-wave radar data through Matlab; the variables "time (time)" and "rang (height) in the lidar data )", "beta (backscatter coefficient)"; read the variables "height (height)" and "Tem (temperature)" in the radiosonde data;

[0057] The data of millimeter-wave radar and lidar are stored in nc format in the form of array, and the data of radiosonde are also stored in dat format in the form of array. The method needs to read the variables "time (time)" and "range (height)" in the millimeter-wave radar and lidar data files, which are two identical one...

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Abstract

The invention discloses a hybrid technology based method of recognizing a supercooled water area by using a threshold method. The method comprises steps of (1) reading data of a radiosonde through Matlab, selecting an area with temperature of -40DEG C-0DEG C, and defining the area as an area in which supercooled water may exist; (2) reading laser radar data through Matlab, selecting an area with laser radar backscatter coefficient greater than 5*10<-5>l / (m.sr) from the area in which supercooled water may exist in step (1), and defining the area as a supercooled water layer area; and (3) reading millimeter wave radar through Matlab, selecting an area with millimeter wave radar spectrum width greater than 0.4m / s and linear depolarization ratio LDR less than -15dBZ from the supercooled waterlayer area in step (2), and defining the area as a supercooled water area. The recognition method has a concise, easy process, and is suitable for conditions without large turbulence and wind shear. The hybrid technology improves recognition efficiency, and the user-friendly interface delivers better user experience.

Description

[0001] Technical field: [0002] The invention relates to the field of meteorological radar, in particular to a supercooled water region recognition algorithm combining millimeter-wave radar, laser radar and sounding temperature data. [0003] Background technique: [0004] The study of supercooled water is an important topic in the field of aviation meteorology. The temperature of supercooled water, water vapor content and the diameter of supercooled cloud water droplets are the prerequisites for aircraft icing, which have a great influence on the nature and intensity of icing. Aircraft icing refers to the accumulation of ice on certain parts of the surface of the aircraft. This phenomenon is mainly formed by the freezing of supercooled water droplets in clouds or supercooled rain in precipitation after hitting the aircraft body, or it can also be formed by the direct sublimation of water vapor on the surface of the aircraft body. Aircraft flying in clouds for too long can ea...

Claims

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Application Information

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IPC IPC(8): G01S7/48G01S7/41G01S13/95G01S17/95G06F8/38
CPCG01S7/4802G01S7/41G01S17/95G01S13/95G06F8/38Y02A90/10
Inventor 王金虎金子琪王美民范盼陈露梁艺潇卜令兵陆春松姜海梅郜海阳任予舒徐园园
Owner NANJING UNIV OF INFORMATION SCI & TECH
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