CN114442102A - ARINC708 radar information real-time drawing method - Google Patents
ARINC708 radar information real-time drawing method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
- G01S13/953—Radar or analogous systems specially adapted for specific applications for meteorological use mounted on aircraft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D43/00—Arrangements or adaptations of instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention provides a method for drawing ARINC708 radar information in real time, which comprises the following steps: the weather radar periodically sends ARINC708 data words, the flight display fills information of scanning lines represented by the analyzed ARINC708 data words into weather information bitmaps, and then the information is drawn in a texture mapping mode in an OpenGL graphic library; the generation process of the weather information bitmap comprises the following steps: establishing an original coordinate system by taking the current position of the airplane as an original point, taking the right front of the airplane body as a Y axis and the right side of the airplane as an X axis; rotating the original coordinate system by 45 degrees anticlockwise to obtain a target coordinate system; and generating the weather information bitmap on the target coordinate system according to the color information on the scanning line represented by the analyzed ARINC708 data word. According to the invention, software is adopted to analyze data and render rapidly, so that the meteorological information drawing efficiency is improved, the meteorological information drawing effect is enhanced, and the rendering performance is obviously improved.
Description
Technical Field
The disclosure relates to the technical field of flight displays, in particular to an ARINC708 radar information real-time drawing method.
Background
A weather radar is an important device for ensuring flight safety, and when the weather radar is initially installed on an airplane, a special radar information display is required to be equipped. With the development of hardware technology, in order to reduce cost and optimize cabin layout, the industry has begun to integrate and display radar information into flight displays. And generating a meteorological radar video in the radar equipment, accessing the picture into the flight display in a video mode, and displaying radar information in a video hardware superposition mode.
To further reduce the cost of the system and increase reliability, attempts have been made to transmit radar data (including scan line data, mode, gain, pitch, etc.) directly to the display via the bus in accordance with the ARINC708 standard, parse the radar data by the flight display software, and generate weather-related graphics that are displayed on the flight display screen. The method makes full use of the existing flight display hardware platform, the radar equipment does not need to be configured with a graphic processing function any more, and the system cost can be obviously reduced.
However, the problem of insufficient performance of real-time rendering of weather radar information under the existing flight display hardware platform is solved, and the hardware processing time is long, so that the rendering speed is low, and the real-time display of weather related graphics is influenced.
Disclosure of Invention
In view of this, the embodiment of the present disclosure provides a method for drawing ARINC708 radar information in real time, where an existing main flight display platform is used to perform software parsing and drawing on radar information, and for the problems of low weather information rendering refresh rate, poor display effect due to lack of data between adjacent scanning lines, and the like, a flight display OpenGL graphics library is used to perform data parsing and fast rendering on weather radar information transmitted by standard ARINC708 data words by using software, so as to improve weather information drawing efficiency, enhance weather information drawing effect, significantly improve rendering performance, and solve the problem of insufficient performance in real-time weather radar information rendering under an existing flight display hardware platform.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for rendering ARINC708 radar information in real time comprises the following steps: periodically sending ARINC708 data words to a flight display by a weather radar, analyzing the ARINC708 data words by the flight display, filling information of scanning lines represented by the analyzed ARINC708 data words into a weather information bitmap, and drawing by adopting a texture mapping mode in an OpenGL graphic library;
the generation process of the weather information bitmap comprises the following steps:
(1) establishing an original coordinate system by taking the current position of the airplane as an original point, taking the right front of the airplane body as a Y axis and the right side of the airplane as an X axis;
(2) rotating the original coordinate system by 45 degrees anticlockwise to obtain a target coordinate system;
(3) and generating the weather information bitmap on the target coordinate system according to the color information on the scanning line represented by the analyzed ARINC708 data word.
Further, step (3) in the process of generating the weather information bitmap further comprises: copying the scanning line information leftwards or rightwards according to the current scanning direction of the radar, and filling the gap between the two scanning lines.
Further, the step of filling the gap between the two scanning lines specifically includes:
(1) calculating the color value of a pixel point on the current scanning line;
(2) judging the scanning direction of the radar, increasing the scanning angle by delta theta or decreasing by delta theta, and calculating the color value of a pixel point on a scanning line with an angle of (theta + delta theta) or (theta-delta theta);
(3) and (3) repeating the step (2) for multiple times until no gap exists between the two scanning lines.
Further, in the step (3), a target coordinate system is adopted, rectangular coordinate values of each corresponding pixel point on the scanning line are calculated through conversion from polar coordinates to rectangular coordinates, pixel information under the coordinate values is updated, and weather information after scanning line data are updated is obtained.
Further, weather radar information within a 90-degree scanning range in the target coordinate system is acquired.
Further, each ARINC708 data word has 1600 bits.
According to the ARINC708 radar information real-time drawing method, the existing main flight display platform is used for conducting software analysis drawing on radar information, and aiming at the problems that the weather information rendering refresh rate is low, the display effect is poor due to lack of data between adjacent scanning lines and the like, the flight display OpenGL graphic library is used for conducting data analysis and rapid rendering on weather radar information transmitted by standard ARINC708 data words through software, the weather information drawing efficiency is improved, the weather information drawing effect is enhanced, the rendering performance is remarkably improved, the flight display software is enabled to analyze radar data rapidly, weather-related graphics are generated, and the weather-related graphics are displayed on a flight display screen.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic representation of ARINC708 data word bit field definition;
FIG. 2 is a schematic diagram of a weather radar coordinate system in the prior art;
FIG. 3 is a schematic diagram of a weather radar coordinate system according to the present invention;
FIG. 4 is a schematic diagram of pixel filling between scanning lines according to the present invention;
fig. 5 is a schematic diagram of a real-time rendering method of ARINC708 radar information in an embodiment of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
The weather radar ARINC708 standard is gradually popularized and used in the industry, weather radar information analysis and rendering are both arranged in a main flight display for reducing cost, and a special radar information analysis and image generation platform is not adopted.
The software analysis and drawing of the radar information are carried out by utilizing the existing flight display hardware platform, the weather radar periodically sends ARINC708 data words to the flight display, the format is shown in figure 1, each ARINC708 data word has 1600 bits, and comprises a plurality of fields, wherein the fields represent a label (label), a radar state, a measuring range, a scanning angle and a weather image at the angle (512 x 3 bits represent a color value of 512 points at the current scanning line angle), and the like.
The weather radar information shows that the ARINC708 data word needs to be analyzed, and the pixel color at the corresponding scanning angle is updated according to the analysis result, which is a schematic diagram of a weather radar coordinate system in the prior art, as shown in fig. 2. The flight display adopts a texture mapping mode in an OpenGL graphic library to draw, fills image information of all scanning lines into a bitmap, and uses the bitmap as a texture for drawing meteorological information.
By adopting the coordinate system of fig. 2, the rectangular coordinate value (x, y) of each pixel point corresponding to the scanning line can be calculated through conversion from the polar coordinate to the rectangular coordinate, and the weather information after updating the data of one scanning line can be obtained by updating the pixel information under the coordinate value.
Using the coordinate system of FIG. 2, the length of the desired texture in the X-axis is calculated as
The length in the Y-axis direction is 512. The length must be 2 due to the OpenGL constraint usednTherefore, the minimum size of the texture required by adopting the coordinate system of fig. 2 is 1024 × 512, and the size of the bitmap is large, so that the hardware processing time is long, and the weather information rendering refresh rate is low.
Based on this, as shown in fig. 3, an embodiment of the present disclosure provides an ARINC708 radar information real-time rendering method, including: periodically sending ARINC708 data words to a flight display by a weather radar, analyzing the ARINC708 data words by the flight display, filling information of scanning lines represented by the analyzed ARINC708 data words into a weather information bitmap, and drawing by adopting a texture mapping mode in an OpenGL graphic library;
the generation process of the weather information bitmap comprises the following steps:
(1) establishing an original coordinate system by taking the current position of the airplane as an original point, taking the right front of the airplane body as a Y axis and the right side of the airplane as an X axis;
(2) rotating the original coordinate system by 45 degrees anticlockwise to obtain a target coordinate system;
(3) and generating the weather information bitmap on the target coordinate system according to the color information on the scanning line represented by the analyzed ARINC708 data word.
Due to the Scan Angle θ value transmitted by the ARINC708 data word, the positive front of the fuselage is 0, the positive right direction is positive, and the negative left direction is negative. Angle corresponding to scan line angle theta in the coordinate system of fig. 3
The coordinates corresponding to the pixel points on the scan line at a distance R from the origin are calculated as:
x＝R cosβ
y＝R sinβ
where R takes on values of 1-512 to index the color values of 512 points in the ARINC708 data word.
The drawing method of the embodiment can effectively reduce the texture size of the bitmap, reduce the hardware processing time, and consider that the weather radar information has a scanning range of only 90 degrees.
Since the meteorological radar ARINC708 data is in polar coordinate form, in the actual rendering, as shown in fig. 4, the two scanning angles are θ1，θ2The tail of the scanning line is lack of data, so that a larger gap can be generated, and the display effect is poor. To fill in the gap, an interpolation method may be used, and a linear interpolation algorithm is usually used between two scanning lines. However, because the original data adopts a polar coordinate mode, the number of pixels to be inserted at different distances from the original point is different, and the pixels also need to be converted to a rectangular coordinate system after interpolation, the specific algorithm is more complex, and the efficiency is not highHigh.
In a preferred embodiment of the present invention, the step (3) in the process of generating the weather information bitmap further includes: copying the scanning line information leftwards or rightwards according to the current scanning direction of the radar, and filling the gap between the two scanning lines.
Further, the step of filling the gap between the two scanning lines specifically includes:
(1) calculating the color value of a pixel point on the current scanning line;
(2) judging the scanning direction of the radar, increasing the scanning angle by delta theta or decreasing by delta theta, and calculating the color value of a pixel point on a scanning line with an angle of (theta + delta theta) or (theta-delta theta);
(3) and (3) repeating the step (2) for multiple times until no gap exists between the two scanning lines.
The mode that this embodiment adopted the space between two scanning lines to fill, and the principle is simple, and is fast, can reach better effect.
The present invention will be further illustrated by the following specific examples. The ARINC708 weather radar information parsing and rendering implementation process is as follows, and refer to FIG. 5:
1. initialization: and establishing an array wxrBmp [512] [512] for storing the whole weather radar image information, wherein the array element type is COLOR, the RGBA four COLOR components are contained, and all elements are cleared. Creating texture for weather radar image rendering.
2. And reading the ARINC708 data word, namely reading the ARINC708 data word from the receiving buffer according to the period.
3. Judging the scanning direction: and analyzing the scanning angle of the current radar from the received ARINC708 data word according to the specification of the interface control file, comparing the scanning angle with the scanning angle of the previous period, wherein the increase of the angle indicates that the radar antenna scans rightwards positively, and the decrease of the angle indicates that the radar antenna scans leftwards positively.
4. Update wxrBmp element: performing polar coordinate to rectangular coordinate transformation, as shown in FIG. 3, where the polar coordinate r is the serial number of the color values of ARINC708 data words, takes values of 1-512, and has an angle of 1
Where θ is the current scan angle. The calculation formula is as described above. Fill the color value of the sequence number corresponding to the ARINC708 data word into the wxrBmp corresponding element.
5. Scanning line copying: according to the scanning direction obtained in the step 3, if the scanning direction is rightward scanning, increasing the value theta, for example, the value theta is 0.1 degree in the item, and repeating the step 4 for multiple times by using the increased value theta; if the scan is left, the value of θ is decreased, for example, 0.1 degree in this item, and step 4 is repeated a plurality of times with the decreased value of θ.
6. And (3) updating the texture: and updating the weather radar texture by the updated wxrBmp.
7. Rendering a weather radar: the coordinate system is rotated by 45 deg. to render weather information in the updated texture.
In practical application, the process is infinitely circulated, and real-time display of the meteorological radar information is carried out on the flight display.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (6)
1. A method for drawing ARINC708 radar information in real time is characterized by comprising the following steps: the weather radar periodically sends ARINC708 data words to the flight display, the flight display analyzes the ARINC708 data words, information of scanning lines represented by the analyzed ARINC708 data words is filled into a weather information bitmap, and then a texture mapping mode in an OpenGL graphic library is adopted for drawing;
the generation process of the weather information bitmap comprises the following steps:
(1) establishing an original coordinate system by taking the current position of the airplane as an original point, taking the right front of the airplane body as a Y axis and the right side of the airplane as an X axis;
(2) rotating the original coordinate system by 45 degrees anticlockwise to obtain a target coordinate system;
(3) and generating the weather information bitmap on the target coordinate system according to the color information on the scanning line represented by the analyzed ARINC708 data word.
2. The method for real-time mapping of ARINC708 radar information of claim 1, wherein the step (3) of generating the weather information map further comprises: copying the scanning line information leftwards or rightwards according to the current scanning direction of the radar, and filling the gap between the two scanning lines.
3. The method for real-time rendering of ARINC708 radar information of claim 2, wherein the step of filling the gap between two scan lines specifically includes:
(1) calculating the color value of a pixel point on the current scanning line;
(2) judging the scanning direction of the radar, increasing the scanning angle by delta theta or decreasing by delta theta, and calculating the color value of a pixel point on a scanning line with an angle of (theta + delta theta) or (theta-delta theta);
(3) and (3) repeating the step (2) for multiple times until no gap exists between the two scanning lines.
4. The method according to claim 1, wherein in step (3), the target coordinate system is adopted, rectangular coordinates of each pixel point on the scan line are calculated through conversion from polar coordinates to rectangular coordinates, and pixel information under the coordinates is updated to obtain weather information after the scan line data is updated.
5. The method for mapping ARINC708 radar information in real-time of claim 1, wherein meteorological radar information is acquired within a 90 ° scan range in the target coordinate system.
6. The method of claim 1, wherein each ARINC708 data word has 1600 bits.
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| CN102874412A (en) * | 2012-10-15 | 2013-01-16 | 中航华东光电有限公司 | Virtual instrument panel set based on ARM (advanced RISC machine) and implementation method thereof |
| CN103021013A (en) * | 2012-11-28 | 2013-04-03 | 无锡羿飞科技有限公司 | High-efficiency processing method for spherical display and rotary output image of projector |
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