CN113589235B - Radar radial flow data extraction method and system - Google Patents
Radar radial flow data extraction method and system Download PDFInfo
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- CN113589235B CN113589235B CN202111142456.8A CN202111142456A CN113589235B CN 113589235 B CN113589235 B CN 113589235B CN 202111142456 A CN202111142456 A CN 202111142456A CN 113589235 B CN113589235 B CN 113589235B
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Abstract
The embodiment of the invention discloses a radar radial flow data extraction method, which comprises the following steps: according to respective first distances rmnAnd a firstThe absolute value of the difference between the two distances r and the respective first azimuth angle thetaijDetermining four radar grid points around the buoy according to the absolute value of the angle difference between the buoy and the second azimuth angle theta; and determining the radial flow of the buoy according to the space distances between the buoy and the four radar grid points. The embodiment of the invention also discloses a radar radial flow data extraction system. The method can extract radial flow data of a point which is closer to the position of the buoy in the spatial position, and reduce the increase of the radar and buoy ratio measurement error caused by the influence of the spatial position.
Description
Technical Field
The invention relates to the technical field of radars, in particular to a method and a system for extracting radar radial flow data.
Background
In the prior art, when extracting radial flow data of a buoy position point, a radial flow of a radar grid point, in which a distance from a radar grid point to a radar station is less than or equal to a distance from a buoy point to the radar station and an included angle between the radar grid point and a due north direction is less than or equal to an included angle between the buoy point and the due north direction, is generally selected as radar radial flow data to be compared with a buoy. The distance relation between the buoy position point and the radar grid point is not considered in the downward rounding method, so that the deviation of the obtained radar radial flow data and the actual radial flow data is large, and the deviation of the measured result is increased.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method and a system for extracting radar radial flow data, which can extract radial flow data at a spatial position closer to a buoy position point, and reduce an increase in a radar-buoy ratio measurement error caused by an influence of the spatial position.
The embodiment of the invention provides a method for extracting radar radial flow data, which comprises the following steps:
determining respective first distances rmnAnd the absolute value of the distance difference between the first distance r and the second distance r, and taking the radar distance element corresponding to the two minimum absolute values of the distance difference as a target radar distance element, wherein the first distance rmnThe distance between the radar range element and the radar station is represented, m and n respectively represent the serial numbers of two radar grid points on the radar range element, and the second distance r represents the distance between the buoy and the radar station;
determining respective first azimuth angles thetaijAnd a second azimuth angle thetaThe absolute value of the difference value takes the radar side bit corresponding to the absolute value of the two minimum angle difference values as the target radar side bit, wherein the first azimuth angle thetaijThe included angle between the radar azimuth element and the due north direction is represented, i and j respectively represent the serial numbers of two radar grid points on the radar azimuth element, and the second azimuth angle theta represents the included angle between the connecting line of the buoy and the radar station and the due north direction;
taking four radar grid points contained in the target radar range element and the target radar square element as four radar grid points closest to the buoy;
respectively determining the space distances between the buoy and the four radar grid points, selecting the minimum space distance from the four space distances, and when the minimum space distance is less than or equal to a preset threshold value a0Taking the radar grid point corresponding to the minimum spatial distance as a target radar grid point, taking the radial flow of the target radar grid point as the radial flow of the buoy, and when the minimum spatial distance is larger than the preset threshold value a0Taking the average of the radial flows of the four radar grid points as the radial flow of the buoy.
As a further improvement of the invention, for one of the radar grid points k, the space distance d between the buoy and the radar grid point kkComprises the following steps:
wherein r iskRepresenting the distance, θ, of the radar grid point k to the radar stationkAnd representing the included angle between the connecting line of the radar grid point k and the radar station and the true north direction.
As a further improvement of the invention, for one of the radar grid points k, the buoy and the radar grid point kUp to the spatial distance d between grid points kkComprises the following steps:
wherein R represents an earth radius, LonA represents a longitude of the radar grid point k, LatA represents a latitude of the radar grid point k, LonB represents the longitude of the buoy, and LatB represents the latitude of the buoy.
As a further improvement of the invention, the preset threshold value a01/3 for radar range resolution.
The embodiment of the invention also provides a system for extracting the radar radial flow data, which comprises:
a distance difference absolute value determination module for determining the respective first distances rmnAnd the absolute value of the distance difference between the first distance r and the second distance r, and taking the radar distance element corresponding to the two minimum absolute values of the distance difference as a target radar distance element, wherein the first distance rmnThe distance between the radar range element and the radar station is represented, m and n respectively represent the serial numbers of two radar grid points on the radar range element, and the second distance r represents the distance between the buoy and the radar station;
an absolute value of angle difference determination module forDetermining respective first azimuth angles thetaijAnd the absolute value of the angle difference between the first azimuth angle theta and the second azimuth angle theta, and using the radar side bit corresponding to the two minimum absolute values of the angle difference as the target radar side bit, wherein the first azimuth angle thetaijThe included angle between the radar azimuth element and the due north direction is represented, i and j respectively represent the serial numbers of two radar grid points on the radar azimuth element, and the second azimuth angle theta represents the included angle between the connecting line of the buoy and the radar station and the due north direction;
a grid point determining module, configured to use four radar grid points included in the target radar range bin and the target radar square bin as four radar grid points closest to the buoy;
a radial flow determination module, configured to determine spatial distances between the buoy and the four radar grid points, respectively, select a minimum spatial distance from the four spatial distances, and when the minimum spatial distance is less than or equal to a preset threshold a0Taking the radar grid point corresponding to the minimum spatial distance as a target radar grid point, taking the radial flow of the target radar grid point as the radial flow of the buoy, and when the minimum spatial distance is larger than the preset threshold value a0Taking the average of the radial flows of the four radar grid points as the radial flow of the buoy.
As a further improvement of the invention, for one of the radar grid points k, the space distance d between the buoy and the radar grid point kkComprises the following steps:
wherein r iskRepresenting the distance, θ, of the radar grid point k to the radar stationkRepresenting a nip between a line connecting the radar grid point k and the radar station and the true north directionAnd (4) an angle.
As a further improvement of the invention, for one of the radar grid points k, the space distance d between the buoy and the radar grid point kkComprises the following steps:
wherein R represents an earth radius, LonA represents a longitude of the radar grid point k, LatA represents a latitude of the radar grid point k, LonB represents the longitude of the buoy, and LatB represents the latitude of the buoy.
As a further improvement of the invention, the preset threshold value a01/3 for radar range resolution.
Embodiments of the present invention also provide an electronic device, which includes a memory and a processor, where the memory is configured to store one or more computer instructions, and the one or more computer instructions are executed by the processor to implement the method.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the method.
The invention has the beneficial effects that:
the distance relation between the buoy position point and the radar grid point is considered, whether the buoy position point is close to the radar grid point or not can be judged from the space position, then radial flow data which is closer to the buoy position point in the space position is extracted, the increase of the radar and buoy ratio measurement error caused by the influence of the space position is reduced, and the accuracy of ground wave radar radial flow and buoy ratio measurement is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic flowchart of a method for extracting radar radial flow data according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic diagram of a buoy and 4 radar grid points closest to the buoy in accordance with an exemplary embodiment of the present invention;
fig. 3 is a schematic diagram of calculating spatial distances between a buoy and 4 radar grid points closest to the buoy according to an exemplary embodiment of the present invention;
fig. 4 is a specific flowchart of a method for extracting radar radial flow data according to an exemplary embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, in the description of the present invention, the terms used are for illustrative purposes only and are not intended to limit the scope of the present invention. The terms "comprises" and/or "comprising" are used to specify the presence of stated elements, steps, operations, and/or components, but do not preclude the presence or addition of one or more other elements, steps, operations, and/or components. The terms "first," "second," and the like may be used to describe various elements, not necessarily order, and not necessarily limit the elements. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. These terms are only used to distinguish one element from another. These and/or other aspects will become apparent to those of ordinary skill in the art in view of the following drawings, and the description of the embodiments of the present invention will be more readily understood by those of ordinary skill in the art. The drawings are only for purposes of illustrating the described embodiments of the invention. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated in the present application may be employed without departing from the principles described in the present application.
As shown in fig. 1, a method for extracting radar radial flow data according to an embodiment of the present invention includes:
determining respective first distances rmnAnd the absolute value of the distance difference between the first distance r and the second distance r, and taking the radar distance element corresponding to the two minimum absolute values of the distance difference as a target radar distance element, wherein the first distance rmnThe distance between the radar range element and the radar station is represented, m and n respectively represent the serial numbers of two radar grid points on the radar range element, and the second distance r represents the distance between the buoy and the radar station;
determining respective first azimuth angles thetaijAnd the absolute value of the angle difference between the second azimuth angle theta, and the absolute value of the angle difference between the two minimum azimuth angles thetaThe corresponding radar side bit is used as the target radar side bit, wherein the first azimuth angle thetaijThe included angle between the radar azimuth element and the due north direction is represented, i and j respectively represent the serial numbers of two radar grid points on the radar azimuth element, and the second azimuth angle theta represents the included angle between the connecting line of the buoy and the radar station and the due north direction;
taking four radar grid points contained in the target radar range element and the target radar square element as four radar grid points closest to the buoy;
respectively determining the space distances between the buoy and the four radar grid points, selecting the minimum space distance from the four space distances, and when the minimum space distance is less than or equal to a preset threshold value a0Taking the radar grid point corresponding to the minimum spatial distance as a target radar grid point, taking the radial flow of the target radar grid point as the radial flow of the buoy, and when the minimum spatial distance is larger than the preset threshold value a0Taking the average of the radial flows of the four radar grid points as the radial flow of the buoy.
The high-frequency ground wave radar can realize all-weather real-time observation of a large-range ocean surface flow field, a large-range wave field and a large-range wind field, and for a single-station radar, the observed ocean current is a speed component of the actual ocean current projected in the radial direction of the radar, namely radial current. The single radar radial flow data are distributed on unit grid points which are divided at equal intervals and equal angle intervals in a radar detection sea area. When comparing radar data with buoy data, ocean current data corresponding to the buoy position point and corresponding to the radial component of the radar needs to be acquired, and the buoy position point is not always exactly located on a unit grid point in the detection range of the radar. Therefore, the radial flow data of the buoy position point needs to be acquired through the distance correlation judgment processing, so that the radar radial flow data of the buoy space position point is closest to the real radial flow data.
The method of the invention considers the distance relationship between the buoy position point and the radar grid point, can judge whether the buoy position point and the radar grid point are close to each other from the space position, further extracts radial flow data which is closer to the buoy position point from the space position, reduces the increase of the radar and buoy ratio measurement error caused by the influence of the space position, and is beneficial to improving the accuracy of the ground wave radar radial flow and buoy ratio measurement.
It is understood that the scanning range of the radar (ground wave radar) is divided into a plurality of unit grids in an azimuth dimension and a distance dimension, the unit grids are divided into a plurality of concentric circles taking a center point as a center in the azimuth dimension, two adjacent concentric circles form a distance ring, the distance dimension is a plurality of rays emitted from the center point, and two adjacent rays form a sector. A cell grid is simultaneously located on a range ring within a sector, for example the cell grid formed by the radar grid points 1, 2, 3, 4 shown in fig. 2. For a cell grid, the line segments in the two ray directions, such as line segment 14 and line segment 23 in fig. 2, are used as radar square bits, and the included angle between the two ray directions and the true north direction is represented by θ14And theta23Two arcs on the range ring are used as radar range elements, such as arc 12 and arc 34 in fig. 2, which are used as radar range elements, and the distance from the radar station is denoted as r12And r34。
It should be noted that there are a plurality of first ranges, there is only one second range, and the first and second ranges are only used for distinguishing the range expressions, and a first range represents the range of a radar range element to the radar station, such as the aforementioned r12And r34Each representing a first distance. When calculating the distance difference absolute value, it is necessary to calculate the difference between each first distance and each second distance and obtain the absolute value of the distance difference by taking the absolute value. Correspondingly, the first azimuth angle is plural, the second azimuth angle is only one, the first azimuth angle and the second azimuth angle are only used for distinguishing the expressions of the azimuth angles, and one first azimuth angle respectively represents the included angle between one radar azimuth element and the true north direction, such as the theta14And theta23Each representing a first azimuth angle. When calculating the absolute value of the angle difference, it is necessary to separately difference each first azimuth angle from each second azimuth angleAnd calculating and taking the absolute value to obtain the absolute value of the angle difference.
When the target radar distance element and the target radar unit element are determined, the target radar distance element represents radar distance elements corresponding to two minimum distance difference absolute values, therefore, two radar distance elements can be screened out from a plurality of radar distance elements, the target radar square element represents radar square elements corresponding to two minimum angle difference absolute values, therefore, two radar square elements can be screened out from a plurality of radar square elements, and then four radar grid points which are closest to the buoy and are included by the two radar distance elements and the two radar square elements are determined. The distance difference absolute value indicates an absolute value of the distance difference, and the angle difference absolute value indicates an absolute value of the angle difference.
For example, in FIG. 2, the smallest two of the plurality of absolute values of the distance difference are r12Absolute value of the difference in distance from r, r34And the absolute value of the distance difference between the target radar range bin and the r can be determined to be two radar range bins of the arc line segment 12 and the arc line segment 34. The smallest two of the plurality of absolute values of the angle difference are θ14Absolute value of the difference in angle between theta, theta23The absolute value of the angle difference between the target radar side bit and the theta can be determined to be the two radar side bits of the line segment 14 and the line segment 23. Through the arc segment 12, the arc segment 34, the segment 14 and the segment 23, it can be obtained that the four radar grid points included in the target radar distance element and the target radar square bit element are 1, 2, 3 and 4, that is, it can be determined that the four radar grid points near the buoy are respectively the radar grid points 1, 2, 3 and 4.
Because the latitude and longitude information of the buoy and the latitude and longitude information of the radar station can be determined, the distance from the buoy to the radar station can be respectively calculated through the latitude and longitude information, and the included angle between the connecting line of the buoy and the radar station and the due north direction (for example, the vertical direction in fig. 3 represents the due north direction N) is calculated.
In an optional embodiment, the preset threshold a01/3 for radar range resolution.
After the four spatial positions are determined, the final radial flow of the buoy is determined to be closer to the actual radial flow through corresponding judgment conditions (threshold values set on the basis of radar distance resolution), and the obtained radial flow data are more accurate.
In an alternative embodiment, for one of the radar grid points k, the spatial distance d between the buoy and the radar grid point k iskComprises the following steps:
wherein r iskRepresenting the distance, θ, of the radar grid point k to the radar stationkAnd representing the included angle between the connecting line of the radar grid point k and the radar station and the true north direction.
When the method calculates the space distance, the distance r from the radar grid point k to the radar station is firstly determinedkAnd an angle theta between a line connecting the radar grid point k and the radar station and the true north directionkThen, the space distance d is determined by utilizing the trigonometric functionk。
For example, in FIG. 3 (r not shown in the figure)2、r3、r4、θ2、θ3、θ4) Distances from the radar grid points 1, 2, 3, 4 to the radar station are denoted r, respectively1、r2、r3、r4And the distance from the radar grid point to the radar station is the radar grid distance value. It is understood that, among others, for example, radar grid distance values r corresponding to radar grid points 1, 21、r2Equal radar grid distance values r corresponding to radar grid points 3 and 43、r4Are equal. Accordingly, angles between lines connecting the radar grid points 1, 2, 3, 4 and the radar station and the true north direction are respectively represented as θ1、θ2、θ3、θ4And the included angle between the connecting line of the radar grid point and the radar station and the true north direction is the azimuth angle of the radar grid. It is understood that, among others, the radar grid azimuth angle θ corresponding to the radar grid points 1, 4, for example1、θ4Are equal, radar grid azimuth theta corresponding to radar grid points 2 and 32、θ3Are equal.
Since the distance from the radar grid point 1 to the radar station is r1The included angle between the connecting line of the radar grid point 1 and the radar station and the true north direction is theta1The included angle theta of the radar grid point 1 can be obtained1The difference from the second azimuth (i.e., the azimuth of the buoy) θ is:
according to the trigonometric function, the space distance between the buoy and the radar grid point 1 is calculated as
The calculation methods of other radar grid points are the same as the calculation method of the radar grid point 1, and are not described herein again.
In an alternative embodiment, for one of the radar grid points k, the spatial distance d between the buoy and the radar grid point k iskComprises the following steps:
wherein R represents an earth radius, LonA represents a longitude of the radar grid point k, LatA represents a latitude of the radar grid point k, LonB represents the longitude of the buoy, and LatB represents the latitude of the buoy.
It should be noted that the method of the present invention can calculate the spatial distance between the buoy and the radar grid point through the trigonometric function, and can also calculate the spatial distance between the radar grid point and the latitude and longitude information of the buoy.
From the above description of the embodiments, it can be understood that the flow of the method of the present invention in the implementation process is shown in fig. 4, and includes:
s1, calculating the distance r from the buoy to the radar station through the longitude and latitude information of the buoy and the radar station, and calculating the included angle theta between the connecting line of the buoy and the radar station and the due north direction, namely the azimuth angle theta of the buoy;
s2, calculating the first distance r from each radar range cell to radarmnThe absolute value of the distance difference between the target radar distance element and the second distance r, and the two radar distance elements corresponding to the smallest distance difference absolute values in all the distance difference absolute values are used as target radar distance elements, namely the two radar distance elements closest to the buoy;
s3, calculating a first azimuth angle theta between each radar azimuth and the true north directionijAnd the absolute value of the angle difference between the target radar side bit and the second azimuth angle theta, and taking the radar side bit corresponding to the two smallest absolute values of the angle difference as the target radar side bit, namely the two radar side bit closest to the buoy;
s4, determining four radar grid points closest to the buoy, such as radar grid points 1, 2, 3, and 4 in fig. 3, by two radar range bins and two radar square bins closest to the buoy;
and S5, calculating the space distance between the 4 radar grid points and the buoy:
for example, in FIG. 3, radar grid points1 included angle
Azimuth angle of the buoy
Difference between them
According to the trigonometric function, the space distance between the buoy and the radar grid point 1 is
。
Correspondingly, the space distance between the buoy and the radar grid point 2 is
The space distance between the buoy and the radar grid point 3 is
The space distance between the buoy and the radar grid point 4 is
；
S6, if the minimum space distance among the 4 space distances is less than or equal to a0Selecting a radial flow of a radar grid point corresponding to the minimum spatial distance, for example, a radial flow of a radar grid point 1 in fig. 3, as a radial flow of the buoy;
s7, if the minimum spatial distance among the 4 spatial distances is greater than a0And calculating the average value of the radial flow of the 4 radar grid points as the radial flow of the buoy.
The embodiment of the invention provides a radar radial flow data extraction system, which comprises:
a distance difference absolute value determination module for determining the respective first distances rmnAnd the absolute value of the distance difference between the first distance r and the second distance r, and taking the radar distance element corresponding to the two minimum absolute values of the distance difference as the target radar distanceElement, wherein the first distance rmnThe distance between the radar range element and the radar station is represented, m and n respectively represent the serial numbers of two radar grid points on the radar range element, and the second distance r represents the distance between the buoy and the radar station;
an absolute value of angle difference determination module for determining each first azimuth angle thetaijAnd the absolute value of the angle difference between the first azimuth angle theta and the second azimuth angle theta, and using the radar side bit corresponding to the two minimum absolute values of the angle difference as the target radar side bit, wherein the first azimuth angle thetaijThe included angle between the radar azimuth element and the due north direction is represented, i and j respectively represent the serial numbers of two radar grid points on the radar azimuth element, and the second azimuth angle theta represents the included angle between the connecting line of the buoy and the radar station and the due north direction;
a grid point determining module, configured to use four radar grid points included in the target radar range bin and the target radar square bin as four radar grid points closest to the buoy;
a radial flow determination module, configured to determine spatial distances between the buoy and the four radar grid points, respectively, select a minimum spatial distance from the four spatial distances, and when the minimum spatial distance is less than or equal to a preset threshold a0Taking the radar grid point corresponding to the minimum spatial distance as a target radar grid point, taking the radial flow of the target radar grid point as the radial flow of the buoy, and when the minimum spatial distance is larger than the preset threshold value a0Taking the average of the radial flows of the four radar grid points as the radial flow of the buoy.
In an alternative embodiment, for one of the radar grid points k, the spatial distance d between the buoy and the radar grid point k iskComprises the following steps:
wherein r iskRepresenting the distance, θ, of the radar grid point k to the radar stationkAnd representing the included angle between the connecting line of the radar grid point k and the radar station and the true north direction.
In an alternative embodiment, for one of the radar grid points k, the spatial distance d between the buoy and the radar grid point k iskComprises the following steps:
wherein R represents an earth radius, LonA represents a longitude of the radar grid point k, LatA represents a latitude of the radar grid point k, LonB represents the longitude of the buoy, and LatB represents the latitude of the buoy.
In an optional embodiment, the preset threshold a01/3 for radar range resolution.
The disclosure also relates to an electronic device comprising a server, a terminal and the like. The electronic device includes: at least one processor; a memory communicatively coupled to the at least one processor; and a communication component communicatively coupled to the storage medium, the communication component receiving and transmitting data under control of the processor; wherein the memory stores instructions executable by the at least one processor to implement the method of the above embodiments.
In an alternative embodiment, the memory is used as a non-volatile computer-readable storage medium for storing non-volatile software programs, non-volatile computer-executable programs, and modules. The processor executes various functional applications of the device and data processing, i.e., implements the method, by executing nonvolatile software programs, instructions, and modules stored in the memory.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store a list of options, etc. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and such remote memory may be connected to the external device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory and, when executed by the one or more processors, perform the methods of any of the method embodiments described above.
The product can execute the method provided by the embodiment of the application, has corresponding functional modules and beneficial effects of the execution method, and can refer to the method provided by the embodiment of the application without detailed technical details in the embodiment.
The present disclosure also relates to a computer-readable storage medium for storing a computer-readable program for causing a computer to perform some or all of the above-described method embodiments.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those of ordinary skill in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It will be understood by those skilled in the art that while the present invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A radar radial flow data extraction method, characterized by comprising:
determining respective first distances rmnAnd a second distance rAnd taking the radar range elements corresponding to the two minimum absolute values of the distance difference as target radar range elements, wherein the first distance rmnThe distance between the radar range element and the radar station is represented, m and n respectively represent the serial numbers of two radar grid points on the radar range element, and the second distance r represents the distance between the buoy and the radar station;
determining respective first azimuth angles thetaijAnd the absolute value of the angle difference between the first azimuth angle theta and the second azimuth angle theta, and using the radar side bit corresponding to the two minimum absolute values of the angle difference as the target radar side bit, wherein the first azimuth angle thetaijThe included angle between the radar azimuth element and the due north direction is represented, i and j respectively represent the serial numbers of two radar grid points on the radar azimuth element, and the second azimuth angle theta represents the included angle between the connecting line of the buoy and the radar station and the due north direction;
taking four radar grid points contained in the target radar range element and the target radar square element as four radar grid points closest to the buoy;
respectively determining the space distances between the buoy and the four radar grid points, selecting the minimum space distance from the four space distances, and when the minimum space distance is less than or equal to a preset threshold value a0Taking the radar grid point corresponding to the minimum spatial distance as a target radar grid point, taking the radial flow of the target radar grid point as the radial flow of the buoy, and when the minimum spatial distance is larger than the preset threshold value a0Taking the average of the radial flows of the four radar grid points as the radial flow of the buoy.
2. The method of claim 1, wherein for one of the radar grid points k, the spatial distance d between the buoy and the radar grid point kkComprises the following steps:
wherein r iskRepresenting the distance, θ, of the radar grid point k to the radar stationkAnd representing the included angle between the connecting line of the radar grid point k and the radar station and the true north direction.
3. The method of claim 1, wherein for one of the radar grid points k, the spatial distance d between the buoy and the radar grid point kkComprises the following steps:
wherein R represents an earth radius, LonA represents a longitude of the radar grid point k, LatA represents a latitude of the radar grid point k, LonB represents the longitude of the buoy, and LatB represents the latitude of the buoy.
4. The method of claim 1, wherein the presettingThreshold a01/3 for radar range resolution.
5. A radar radial flow data extraction system, the system comprising:
a distance difference absolute value determination module for determining the respective first distances rmnAnd the absolute value of the distance difference between the first distance r and the second distance r, and taking the radar distance element corresponding to the two minimum absolute values of the distance difference as a target radar distance element, wherein the first distance rmnThe distance between the radar range element and the radar station is represented, m and n respectively represent the serial numbers of two radar grid points on the radar range element, and the second distance r represents the distance between the buoy and the radar station;
an absolute value of angle difference determination module for determining each first azimuth angle thetaijAnd the absolute value of the angle difference between the first azimuth angle theta and the second azimuth angle theta, and using the radar side bit corresponding to the two minimum absolute values of the angle difference as the target radar side bit, wherein the first azimuth angle thetaijThe included angle between the radar azimuth element and the due north direction is represented, i and j respectively represent the serial numbers of two radar grid points on the radar azimuth element, and the second azimuth angle theta represents the included angle between the connecting line of the buoy and the radar station and the due north direction;
a grid point determining module, configured to use four radar grid points included in the target radar range bin and the target radar square bin as four radar grid points closest to the buoy;
a radial flow determination module, configured to determine spatial distances between the buoy and the four radar grid points, respectively, select a minimum spatial distance from the four spatial distances, and when the minimum spatial distance is less than or equal to a preset threshold a0Taking the radar grid point corresponding to the minimum spatial distance as a target radar grid point, taking the radial flow of the target radar grid point as the radial flow of the buoy, and when the minimum spatial distance is larger than the preset threshold value a0Taking the average of the radial flows of the four radar grid points as the radial flow of the buoy.
6. The system of claim 5, wherein for one of the radar grid points k, the spatial distance d between the buoy and the radar grid point kkComprises the following steps:
wherein r iskRepresenting the distance, θ, of the radar grid point k to the radar stationkAnd representing the included angle between the connecting line of the radar grid point k and the radar station and the true north direction.
7. The system of claim 5, wherein for one of the radar grid points k, the spatial distance d between the buoy and the radar grid point kkComprises the following steps:
wherein R represents an earth radius, LonA represents a longitude of the radar grid point k, LatA represents a latitude of the radar grid point k, LonB represents the longitude of the buoy, and LatB represents the latitude of the buoy.
8. The system of claim 5, wherein the preset threshold a01/3 for radar range resolution.
9. An electronic device comprising a memory and a processor, wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method of any of claims 1-4.
10. A computer-readable storage medium, on which a computer program is stored, the computer program being executable by a processor for implementing the method according to any one of claims 1-4.
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