CN117008863A - LOFAR long data processing and displaying method and device - Google Patents
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Abstract
The application provides a LOFAR long data processing and displaying method and device, and belongs to the technical field of sonar. The application adopts the sectional display with switchable data, improves the display precision, accuracy and integrity of the LOFAR long data by a self-adaptive sectional compression display method, can obtain more comprehensive information, has clearer and more visual observation on the LOFAR long data display mode, and is beneficial to a user to rapidly and accurately analyze the LOFAR long data.
Description
Technical Field
The application belongs to the field of passive sonar underwater sound data display, and particularly relates to a LOFAR long data processing and displaying method and device.
Background
Passive sonar signal processing is a technique that obtains target-related parameters and characteristics by receiving and processing radiated noise from a target in water. For passive sonar, the spectrum characteristics of the radiation noise are mainly LOFAR and DEMON, in the field of underwater sound, the target radiation noise line spectrum is often called LOFAR spectrum, the LOFAR characteristics have clear physical explanation and can correspond to the physical structure of a ship, the characteristics have good robustness, and the characteristics are one of important characteristic quantities of the ship radiation noise, and are widely used for sonar target detection and identification.
The passive sonar receives radiation noise of an ocean environment or a target in water or sonar signals through the hydrophone to generate underwater sound data, the data are subjected to FFT (fast Fourier transform) to obtain LOFAR data, the LOFAR data are intensity information of sound signals at different frequency points of a full frequency band, the intensity information is represented as peaks with different intensities at a display end, a great effect is achieved in analyzing characteristic frequencies of the underwater sound target, a user needs to intuitively analyze results output by the LOFAR, and corresponding characteristic frequency points, namely radiation noise peak signals specific to a certain target, are found. The processing and displaying of the LOFAR data is particularly important, and directly affects the detection and identification of the target by the user.
When the hydrophone receives sonar signals, some radiation noise of the ship can be collected, so that the peak intensity of low-frequency signals of LOFAR data is strong, the high-frequency parts are weak in comparison, when the two parts are displayed at the same time, a user cannot intuitively and rapidly observe some strong signals of the high-frequency parts, namely certain characteristic frequency points, but the information of a plurality of important underwater targets contained in the low-frequency parts cannot be discarded.
In addition, as the data resolution is gradually increased, the data length is also larger and larger, but the resolution of a display and the accuracy of human eye observation are limited, and the data needs to be compressed, however, a large part of peak information can be lost in the current direct sampling compression mode, the peak intensity in the data can not be accurately displayed, the accuracy and the accuracy of the data are affected, the follow-up irrecoverable data is also affected, and the integrity of the data is also affected.
Disclosure of Invention
The application aims to provide a LOFAR long data processing and displaying method and device aiming at the defects of the prior art.
The technical scheme adopted by the application is as follows:
a LOFAR long data processing and displaying method comprises the following steps:
obtaining LOFAR long data to be processed in real time, and sequentially storing the LOFAR long data into a first array, wherein the height of the first array is H and the width of the first array is W1;
cutting the LOFAR long data to be displayed in the first array according to the upper cut-off frequency f1 and the lower cut-off frequency f2 of the LOFAR long data range selected to be checked, and storing the LOFAR long data to the second array; wherein, the starting point of cutting is f1/r, and the cutting stopping point f2/r; r is the resolution of the long data of the LOFAR; the height of the second array is H, and the width W2 is the difference value between the cut-off point and the starting point;
compressing the data stored in the second array and storing the data into a third array, wherein the size of the third array is consistent with the display size of the display terminal, and the width is W and the height is H; the compression process is specifically as follows:
calculating the width M of the samples according to the widths of the third array and the second array: m=floor (W2/W), floor (x) represents rounding down;
for the first W-1 data points in the third array, the value of each data point j is the maximum value obtained by traversing the jth M to (j+1) M data points in the second array;
the value of the W data point in the third array is the maximum value obtained by traversing the (W-1) th data point to the last data point in the second array;
and displaying on the display terminal according to the third array.
Further, the display mode of the third array is pseudo-color calendar or line spectrum. The pseudo-color calendar graph can be visually observed in the time dimension, so that the data energy intensity can be conveniently compared and analyzed in the time dimension, and the resolution capability of human eyes on details can be enhanced. The correlation of different intensity peaks can be observed in a finer manner by the line spectrogram, data are displayed in a broken line mode, and the intensity amplitude of the data can be observed more intuitively to observe the peaks. The data change can be clearly observed from the curve change of the line graph. The user can select the display mode of the display terminal by himself.
Further, the method further comprises the step of displaying the selected point on the display terminal:
the method comprises the steps that a point to be displayed is selected through the movement of a buoy in a display terminal, and meanwhile, the buoy extracts the transverse and longitudinal offset x and y of a data point closest to the point to be displayed in real time;
according to the longitudinal offset y, acquiring a time value of the (H-y) th data point in the third array as the time of the point to be displayed and displaying; according to the offset x of the abscissa, the frequency of the point to be displayed is calculated by (f 2-f 1)/W x+f1 and displayed.
Further, the selectively viewed long data range of the LOFAR is: 0-100Hz, 100-400Hz, 400-3000Hz or 0-3000Hz.
A long data processing and display device comprising:
the acquisition unit is used for acquiring LOFAR long data to be processed in real time and sequentially storing the LOFAR long data into a first array, wherein the height of the first array is H and the width of the first array is W1;
the selecting unit is used for selecting the checked LOFAR long data range, cutting the LOFAR long data to be displayed in the first array according to the upper cut-off frequency f1 and the lower cut-off frequency f2 of the checked LOFAR long data range, and storing the LOFAR long data to the second array; wherein, the starting point of cutting is f1/r, and the cutting stopping point f2/r; r is the resolution of the long data of the LOFAR; the height of the second array is H, and the width W2 is the difference value between the cut-off point and the starting point;
the compression unit is used for compressing the data stored in the second array and storing the data into a third array, wherein the size of the third array is consistent with the display size of the display terminal, and the width is W and the height is H; the compression process is specifically as follows:
calculating the width M of the samples according to the widths of the third array and the second array: m=floor (W2/W), floor (x) represents rounding down;
for the first W-1 data points in the third array, the value of each data point j is the maximum value obtained by traversing the jth M to (j+1) M data points in the second array;
the value of the W data point in the third array is the maximum value obtained by traversing the (W-1) th data point to the last data point in the second array;
and the display terminal displays the display terminal according to the third array.
Further, the display mode of the display terminal is a pseudo-color calendar or a line spectrum.
Further, the device also comprises a point display unit, wherein the point display unit comprises a mouse and a point display module; wherein:
the mouse is used for selecting a point to be displayed by moving the buoy on the display terminal;
the point display module is used for extracting the transverse and longitudinal offset x, y of the data point closest to the point to be displayed currently in real time through the buoy; according to the longitudinal offset y, acquiring a time value of the (H-y) th data point in the third array as the time of the point to be displayed and displaying; according to the offset x of the abscissa, the frequency of the point to be displayed is calculated by (f 2-f 1)/W x+f1 and displayed.
Further, the selectively viewed long data range of the LOFAR is: 0-100Hz, 100-400Hz, 400-3000Hz or 0-3000Hz.
An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of long data processing and displaying when executing the computer program.
A storage medium containing computer executable instructions that when executed by a computer processor implement the one long data processing and display method.
The beneficial effects of the application are as follows: the application adopts the sectional display with switchable data, and improves the display precision, accuracy and integrity of LOFAR long data by a self-adaptive sectional compression method, so that a user can obtain more comprehensive information and more clear and visual observation. The method is beneficial to a user to rapidly and accurately analyze the LOFAR long data.
Drawings
FIG. 1 is a flow chart of an exemplary LOFAR long data processing and display method;
FIG. 2 is a pseudo-calendar obtained by an exemplary LOFAR long data processing and display method;
FIG. 3 is a line spectrum diagram of an exemplary LOFAR long data processing and display method;
FIG. 4 is a block diagram of an exemplary LOFAR long data processing and display device;
fig. 5 is a block diagram of an exemplary electronic device.
Detailed Description
In order that the application may be more clearly set forth, exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
Fig. 1 is a flowchart of an exemplary method for processing and displaying long data of a long data storage device, as shown in fig. 1, according to the present application, the method for processing and displaying long data of a long data storage device includes the following steps:
step one: obtaining LOFAR long data to be processed in real time, and sequentially storing the LOFAR long data into a first array, wherein the height of the first array is H and the width of the first array is W1;
specifically, long data of LOFAR to be processed is obtained from a background in real time and stored in a first two-dimensional array a for caching, the first two-dimensional array a is sequentially stored according to time, only data at a single moment can be provided, and also data at a plurality of continuous moments or discontinuous moments can be provided, wherein the height of the first two-dimensional array a is H and is matched with the height displayed by a display terminal; when the first two-dimensional array a is full, the first two-dimensional array a can push out the LOFAR long data of the current earliest time, namely the first line data, and sequentially move up to add the LOFAR long data of the latest time in the last line.
Step two: cutting the LOFAR long data to be displayed in the first array according to the upper cut-off frequency f1 and the lower cut-off frequency f2 of the LOFAR long data range selected to be checked, and storing the LOFAR long data to the second array;
specifically, firstly, obtaining segmentation parameters, namely, selecting an upper cutoff frequency f1 and a lower cutoff frequency f2 of a checked LOFAR long data range; the user may randomly input an upper cut-off frequency f1 and a lower cut-off frequency f2 of the long data range of the look-up. Or a plurality of options for selecting and viewing the long data range of the LOFAR are customized, for example, 4 options are provided in the embodiment, namely, 0-100Hz, 100-400Hz, 400-3000Hz, and 0-3000Hz, and a user can obtain the upper cut-off frequency f1 and the lower cut-off frequency f2 of the long data range of the LOFAR selected and viewed by selecting an endpoint of the extraction range after selecting a certain option; in the method, default options can be set, for example, if the user does not perform a selection operation, the segment parameters of the first option are selected by default for subsequent display. By selecting part of the frequency range for display according to the requirement, some strong signals of the high-frequency part can be selectively, intuitively and rapidly observed, and information loss is avoided.
Secondly, after obtaining the segmentation parameters, cutting out the data cached in the first array and storing the data into a second array, wherein the resolution (the inverse of the number of data points sampled at one frequency) of the data is r, calculating a starting point f1/r of cutting out the data according to the segmentation parameters selected by a user, a cutting-out cut-out point f2/r of cutting out the data, and the length of the cut-out data is W2, wherein W2 = f2/r-f1/r; carrying out data on each row of data in the first array and storing the data into a second array b, wherein the width of the second array b is W2, and the height of the second array b is H;
step three: compressing the data stored in the second array b and storing the data into a third array c, wherein the size of the third array is consistent with the display size of the display terminal, and the width is W and the height is H; the compression process is specifically as follows:
the sampling width M, m=floor (W2/W) is calculated according to the width W of the third array c and the data width W2 of the second array after interception. floor (x) represents rounding down.
For the first W-1 data points in the third array c, the value of data point j is the maximum value obtained by traversing the jth through (j+1) th data points in the second array b, expressed as: c [ i ] [ j ] = max { b [ i ] [ j ] M ], b [ i ] [ j ] m+1] … b [ i ] [ (j+1) M ] }; wherein c [ i ] [ j ] represents the value of the data point of the ith row and the jth column in the third array c; similarly, b [ i ] [ j ] M ] represents the value of the data point of the j [ M ] th column of the ith row in the second array b;
for the value of the W data point in the third array c, the maximum value obtained by traversing the (W-1) th data point to the last data point in the second array b is c [ i ] [ W ] =max { b [ i ] [ W-1) ×m ], b [ i ] [ W-1) ×m+1] … b [ i ] [ end ] };
each row of data of the two-dimensional second array b is compressed, thereby obtaining a two-dimensional third array c for display.
The display precision of the LOFAR data refers to the closeness between the observed characteristic frequency point and the target true characteristic frequency point, the accuracy refers to the consistency degree of the observed characteristic frequency point and the target true characteristic frequency point, the true characteristic frequency point is a peak value with stronger intensity at the display end, and the abscissa corresponding to the peak value is the frequency. In the data analysis, the limitation is imposed on the limit of the observation of human eyes and the resolution of a display, and a pixel point of the display corresponds to a data point which is the optimal setting of the observation of human eyes, so that data needs to be compressed, compressed data obtained by sampling is randomly lost by most of peak point information with stronger intensity due to the equidistant sampling in the traditional method. The integrity of the data means that all the values of the data to be displayed are complete and correct, in the traditional method, the data are directly sampled and displayed, the complete data are lost and cannot be recovered at the display end later, in the method, the complete data to be displayed with the length of W1 are stored at the display end, and the data can be displayed in a segmented mode or displayed in a full mode according to the selection of a user, so that the integrity of LOFAR long data display is improved.
Step four: and displaying on the display terminal according to the third array.
In the step, the data display can adopt a pseudo-color calendar display mode or a line spectrum display mode. To facilitate comparative analysis of the energy intensity of the data in the time dimension, the data is typically tiled in the time dimension, and the pseudo-color calendar can enhance the resolution of details by the human eye, thereby helping the user to better view and analyze the image. The pseudo-color image is displayed on the data, and the data peak intensity information is displayed on the image. When LOFAR data is analyzed, the pseudo color process diagram can intuitively compare the data energy intensity at different times, the line spectrum diagram can clearly show the detail of the LOFAR data, the data is displayed in a broken line form, a user can intuitively observe the data intensity amplitude, and analysis works such as peak observation, waveform analysis and the like are performed. The two display modes have different display effects but similar display processes, and corresponding display processes are executed according to the selection of a user. Fig. 2 is a pseudo-color history obtained by an exemplary method for processing and displaying long data of a lor, and fig. 3 is a graph obtained by an exemplary method for processing and displaying long data of a lor.
The method improves the display precision, accuracy and integrity of the LOFAR long data, so that a user can obtain more comprehensive information and more clear and visual observation. The method is beneficial to a user to rapidly and accurately analyze the LOFAR long data.
As a preferred solution, the method further comprises displaying the selected point on the display terminal. The method comprises the following steps:
the point to be displayed is selected by moving the buoy on the display terminal, if a user operates a mouse to move the buoy in the pseudo-color calendar or the line spectrum, the position of the buoy is the point to be displayed; meanwhile, the buoy can extract the transverse and longitudinal offset of the data point closest to the point to be displayed (the current position) in real time, and according to the longitudinal offset y, the time value of the (H-y) th data point in the third array is obtained as the time of the point to be displayed and displayed; the frequency as the point to be displayed is calculated from (f 2-f 1)/W x+f1 according to the offset x of the abscissa.
As a preferred solution, the display terminal may also select other graphic elements and formats of the other graphic elements, where the other graphic elements include a frequency scale, a time scale, an option for selecting a long data range of the look-up local, an auxiliary line, and a character information display, and all the scales, the auxiliary line, and the characters may be selected by the user to be displayed or hidden.
The frequency scale mainly and uniformly displays the start-stop frequency of the currently selected frequency band data, and the start-stop frequency set by the first option in the options of the LOFAR long data range which can be selected and checked by default during initialization can be displayed as [0Hz,100Hz ], [100Hz,400Hz ], [400Hz,3000Hz ], [0Hz,3000Hz ], or other defined different segmentation values; the time scale mainly displays the time range of all the current data, and can have a single moment or a plurality of continuous moments or discontinuous moments.
The auxiliary line is a horizontal line segment and a vertical line segment which penetrate through the current position of the mouse buoy and respectively extend to two horizontal and vertical coordinate axes of the whole display image.
The character display information is mainly used for displaying time and frequency information of the current buoy position data.
The application also provides an embodiment of the LOFAR long data processing and displaying device corresponding to the embodiment of the LOFAR long data processing and displaying method.
Referring to fig. 4, a long data processing and displaying device for a local area network (local area network) according to an embodiment of the present application includes:
the acquisition unit is used for acquiring LOFAR long data to be processed in real time and sequentially storing the LOFAR long data into a first array, wherein the height of the first array is H and the width of the first array is W1;
the selecting unit is used for selecting the checked LOFAR long data range, cutting the LOFAR long data to be displayed in the first array according to the upper cut-off frequency f1 and the lower cut-off frequency f2 of the checked LOFAR long data range, and storing the LOFAR long data to the second array; wherein, the starting point of cutting is f1/r, and the cutting stopping point f2/r; r is the resolution of the long data of the LOFAR; the height of the second array is H, and the width W2 is the difference value between the cut-off point and the starting point;
the compression unit is used for compressing the data stored in the second array and storing the data into a third array, wherein the size of the third array is consistent with the display size of the display terminal, and the width is W and the height is H; the compression process is specifically as follows:
calculating the width M of the samples according to the widths of the third array and the second array: m=floor (W2/W), floor (x) represents rounding down;
for the first W-1 data points in the third array, the value of each data point j is the maximum value obtained by traversing the jth M to (j+1) M data points in the second array;
the value of the W data point in the third array is the maximum value obtained by traversing the (W-1) th data point to the last data point in the second array;
and the display terminal displays the display terminal according to the third array. The display mode of the display terminal is a pseudo-color calendar or a line spectrum, and a user can select the display mode independently. The LOFAR data display is to observe the peak value in the data in detail so that the user can find the target true characteristic frequency point, and can also be used for important analysis when a certain peak value continuously appears at a plurality of continuous moments or discontinuous moments. Therefore, there are two demands of users, one is to be able to directly observe in the time dimension, and the other is to be able to observe the correlation of different intensity peaks more carefully.
For the first requirement of the user, namely, the user can visually observe in the time dimension, the pseudo-color calendar can further meet the requirement. To facilitate comparative analysis of the energy intensity of the data in the time dimension, the data is typically tiled in the time dimension, and the pseudo-color calendar can enhance the resolution of details by the human eye, thereby helping the user to better view and analyze the image. The pseudo-color map shows the data, and the data peak intensity information is shown on the map, as shown in fig. 2.
For the second requirement of the user, namely, the correlation relation of different intensity peaks can be observed in a finer manner, the line spectrum diagram can meet the requirement. When LOFAR data are analyzed, the pseudo-color history can intuitively compare the data energy intensity at different times, but a user also needs to analyze and compare the detail of the LOFAR data. The data is displayed in the form of broken lines by the line spectrogram, and as shown in fig. 3, the user can more intuitively observe the intensity and the amplitude of the data, and perform analysis works such as peak observation, waveform analysis and the like. The data change can be clearly observed from the curve change of the line graph. In the device, the user can select the display mode of the display terminal by himself.
The device also comprises a point display unit, wherein the point display unit comprises a mouse and a point display module; wherein:
the mouse is used for selecting a point to be displayed by moving the buoy on the display terminal;
the point display module is used for extracting the transverse and longitudinal offset x, y of the data point closest to the point to be displayed currently in real time through the buoy; according to the longitudinal offset y, acquiring a time value of the (H-y) th data point in the third array as the time of the point to be displayed and displaying; according to the offset x of the abscissa, the frequency of the point to be displayed is calculated by (f 2-f 1)/W x+f1 and displayed.
The LOFAR long data range selected and checked is as follows: 0-100Hz, 100-400Hz, 400-3000Hz or 0-3000Hz.
The implementation process of the functions and roles of each unit in the above device is specifically shown in the implementation process of the corresponding steps in the above method, and will not be described herein again.
For the device embodiments, reference is made to the description of the method embodiments for the relevant points, since they essentially correspond to the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purposes of the present application. Those of ordinary skill in the art will understand and implement the present application without undue burden.
The embodiment of the application also provides an electronic device, as shown in fig. 5, which comprises one or more processors for implementing a long data processing and displaying method of the above embodiment.
The embodiment of the electronic device of the application can be applied to any device with data processing capability, and the device with data processing capability can be a device or an apparatus such as a computer.
The apparatus embodiments may be implemented in software, or in hardware or a combination of hardware and software. Taking a software implementation as an example, as a device in a logic sense, a processor of any device with data processing capability reads corresponding computer program instructions in a nonvolatile memory to a memory to operate to form a hardware-level slave, as shown in fig. 5, which is a hardware structure diagram of any device with data processing capability where an electronic device of the present application is located, except for the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 5, where any device with data processing capability where an embodiment is located generally includes other hardware according to an actual function of the any device with data processing capability, which is not described herein.
The embodiment of the application also provides a computer readable storage medium, on which a program is stored, which when executed by a processor, implements a long data processing and displaying method of the above embodiment.
The computer readable storage medium may be an internal storage unit, such as a hard disk or a memory, of any of the data processing enabled devices described in any of the previous embodiments. The computer readable storage medium may be any device having data processing capability, for example, a plug-in hard disk, a Smart Media Card (SMC), an SD Card, a Flash memory Card (Flash Card), or the like, which are provided on the device. Further, the computer readable storage medium may include both internal storage units and external storage devices of any data processing device. The computer readable storage medium is used for storing the computer program and other programs and data required by the arbitrary data processing apparatus, and may also be used for temporarily storing data that has been output or is to be output.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary or exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present application.
Claims (10)
1. A method for processing and displaying long data of a local area network, comprising:
obtaining LOFAR long data to be processed in real time, and sequentially storing the LOFAR long data into a first array, wherein the height of the first array is H and the width of the first array is W1;
cutting the LOFAR long data to be displayed in the first array according to the upper cut-off frequency f1 and the lower cut-off frequency f2 of the LOFAR long data range selected to be checked, and storing the LOFAR long data to the second array; wherein, the starting point of cutting is f1/r, and the cutting stopping point f2/r; r is the resolution of the long data of the LOFAR; the height of the second array is H, and the width W2 is the difference value between the cut-off point and the starting point;
compressing the data stored in the second array and storing the data into a third array, wherein the size of the third array is consistent with the display size of the display terminal, and the width is W and the height is H; the compression process is specifically as follows:
calculating the width M of the samples according to the widths of the third array and the second array: m=floor (W2/W), floor (x) represents rounding down;
for the first W-1 data points in the third array, the value of each data point j is the maximum value obtained by traversing the jth M to (j+1) M data points in the second array;
the value of the W data point in the third array is the maximum value obtained by traversing the (W-1) th data point to the last data point in the second array;
and displaying on the display terminal according to the third array.
2. The method of claim 1, wherein the third array is displayed in a pseudo-calendar or a line graph.
3. The method of claim 1, further comprising displaying the selected point at a display terminal:
the method comprises the steps that a point to be displayed is selected through the movement of a buoy in a display terminal, and meanwhile, the buoy extracts the transverse and longitudinal offset x and y of a data point closest to the point to be displayed in real time;
according to the longitudinal offset y, acquiring a time value of the (H-y) th data point in the third array as the time of the point to be displayed and displaying; according to the offset x of the abscissa, the frequency of the point to be displayed is calculated by (f 2-f 1)/W x+f1 and displayed.
4. The method of claim 1, wherein the selectively viewed long data range of LOFAR is: 0-100Hz, 100-400Hz, 400-3000Hz or 0-3000Hz.
5. A long data processing and displaying device, comprising:
the acquisition unit is used for acquiring LOFAR long data to be processed in real time and sequentially storing the LOFAR long data into a first array, wherein the height of the first array is H and the width of the first array is W1;
the selecting unit is used for selecting the checked LOFAR long data range, cutting the LOFAR long data to be displayed in the first array according to the upper cut-off frequency f1 and the lower cut-off frequency f2 of the checked LOFAR long data range, and storing the LOFAR long data to the second array; wherein, the starting point of cutting is f1/r, and the cutting stopping point f2/r; r is the resolution of the long data of the LOFAR; the height of the second array is H, and the width W2 is the difference value between the cut-off point and the starting point;
the compression unit is used for compressing the data stored in the second array and storing the data into a third array, wherein the size of the third array is consistent with the display size of the display terminal, and the width is W and the height is H; the compression process is specifically as follows:
calculating the width M of the samples according to the widths of the third array and the second array: m=floor (W2/W), floor (x) represents rounding down;
for the first W-1 data points in the third array, the value of each data point j is the maximum value obtained by traversing the jth M to (j+1) M data points in the second array;
the value of the W data point in the third array is the maximum value obtained by traversing the (W-1) th data point to the last data point in the second array;
and the display terminal displays the display terminal according to the third array.
6. The apparatus of claim 5, wherein the display terminal displays the pseudo-calendar or the line spectrum.
7. The apparatus of claim 5, further comprising a point display unit comprising a mouse and a point display module; wherein:
the mouse is used for selecting a point to be displayed by moving the buoy on the display terminal;
the point display module is used for extracting the transverse and longitudinal offset x, y of the data point closest to the point to be displayed currently in real time through the buoy; according to the longitudinal offset y, acquiring a time value of the (H-y) th data point in the third array as the time of the point to be displayed and displaying; according to the offset x of the abscissa, the frequency of the point to be displayed is calculated by (f 2-f 1)/W x+f1 and displayed.
8. The apparatus of claim 5, wherein the selectively viewed long data range of LOFAR is: 0-100Hz, 100-400Hz, 400-3000Hz or 0-3000Hz.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements a long data processing and displaying method as claimed in any one of claims 1-4 when executing the computer program.
10. A storage medium containing computer executable instructions which when executed by a computer processor implement a long data processing and display method of LOFAR as claimed in any of claims 1-4.
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