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Monsoon vortex locating method

A positioning method and vortex technology, applied in the field of positioning, can solve the problems of cumbersome process, long time, and no objective judgment method for the activity of monsoon vortex, and achieve the process of positioning and recognition with less time consumption and small recognition error objective effect

Inactive Publication Date: 2013-08-28
NANJING XINDA HIGH TECH DEV
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Problems solved by technology

[0006] The prior art has the following defects: 1. Only human eyes can be used to identify the monsoon vortex in the whole wind field data. When the monsoon vortex activity is accompanied by tropical cyclones, it is difficult to clearly distinguish the monsoon vortex with the naked eye. There are two types of systems, the monsoon vortex and the tropical cyclone; 2. There is no objective method for judging the activities of the monsoon vortex, such as the definition of the monsoon vortex system, and the judgment of the start and end time of the monsoon vortex activities. ; 3. The method of human eye recognition inevitably has subjective errors, and requires long-term statistical work, which is very cumbersome

Method used

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Embodiment Construction

[0031] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0032] refer to figure 1 Shown, the monsoon vortex positioning method of the present invention comprises:

[0033] Step 1: Obtain the whole wind field data, and divide the monsoon vortex occurrence area in the whole wind field data;

[0034] Step 2: Use a low-pass filter to filter the region where the monsoon vortex occurs to obtain low-frequency wind field data;

[0035] Step 3: Locate the vortex centers 2 of all vortices in the low-frequency wind field data;

[0036] Step 4: Calculate the circulation strength and duration of the vortex, obtain the horizontal scale of the vortex, and locate the monsoon vortex 5 according to the horizontal scale and duration of the vortex.

[0037] One of the purposes of the present invention is to process the whole wind field data, and finally locate the monsoon vortex 5, such as Figure 5 shown. Al...

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Abstract

The invention discloses a monsoon vortex locating method. The monsoon vortex locating method is characterized by including a first step of acquiring whole wind field data and marking out monsoon vortex generating areas in the whole wind field data, a second step of carrying out filtering on the monsoon vortex generating areas through a low-pass filter and acquiring low-frequency wind field data, a third step of locating vortex centers of all the vortex in the low-frequency wind field data and a fourth step of calculating circulation strength and time of duration of the vortexes, obtaining horizontal dimensions of the vortexes and locating the monsoon vortexes according to the horizontal dimensions and the time of duration of the vortexes. The monsoon vortex locating method is small in identification error, short in consumed time of the method, and very objective in locating identification process.

Description

technical field [0001] The invention relates to a positioning method, in particular to a monsoon vortex positioning method. Background technique [0002] It is well known that atmospheric disturbance in the middle and lower troposphere is one of the conditions for the occurrence of tropical weather. Most of the tropical cyclones in the North Atlantic Ocean are formed in the easterly wave, and the statistics of tropical cyclone activities in the Northwest Pacific Ocean have found that due to the prevailing southwest monsoon in summer, a considerable number of tropical cyclones are formed in the monsoon circulation. The monsoon vortex is a special form of closed circulation during monsoon activity, which occurs in the middle and lower layers of the troposphere in summer, and is a special form of the southwest monsoon. [0003] As early as the middle and late last century, the monsoon vortex has attracted the attention of foreign scholars, but there are few related studies in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01W1/00
Inventor 李肖雅
Owner NANJING XINDA HIGH TECH DEV
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