CN114442102B - ARINC708 radar information real-time drawing method - Google Patents

ARINC708 radar information real-time drawing method Download PDF

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Publication number
CN114442102B
CN114442102B CN202111636753.8A CN202111636753A CN114442102B CN 114442102 B CN114442102 B CN 114442102B CN 202111636753 A CN202111636753 A CN 202111636753A CN 114442102 B CN114442102 B CN 114442102B
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arinc708
information
radar
coordinate system
weather
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CN114442102A (en
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文圣丰
吴楠
柴睿鸽
路帅
张亚平
于翔
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Xian Aeronautics Computing Technique Research Institute of AVIC
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Xian Aeronautics Computing Technique Research Institute of AVIC
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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
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01W—METEOROLOGY
    • G01W1/00—Meteorology
    • 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
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Environmental Sciences (AREA)
  • Ecology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Electromagnetism (AREA)
  • Atmospheric Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention provides a real-time ARINC708 radar information drawing method, which comprises the following steps: the weather radar periodically sends ARINC708 data words, and the flight display fills the information of the scanning lines represented by the resolved ARINC708 data words into a weather information bitmap and then draws the information by adopting a texture mapping mode in an OpenGL graphic library; the generation process of the weather information bitmap comprises the following steps: taking the current position of the airplane as an origin, taking the right front of the airplane body as a Y axis, taking the right of the airplane as an X axis, and establishing an original coordinate system; 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 resolved ARINC708 data word. According to the method, software is adopted for data analysis and quick rendering, so that the weather information drawing efficiency is improved, the weather information drawing effect is enhanced, and the rendering performance is remarkably improved.

Description

ARINC708 radar information real-time drawing method
Technical Field
The disclosure relates to the technical field of flight displays, in particular to a real-time drawing method for ARINC708 radar information.
Background
Weather radar is an important device for ensuring flight safety, and a special radar information display is required to be provided when the weather radar is initially installed on an aircraft. With the development of hardware technology, in order to reduce the cost and optimize the cabin layout, the industry starts to integrate and display radar information into the flight display. And generating a weather radar video in the radar equipment, accessing the picture into a 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 send radar data (including scan line data, modes, gains, pitches, etc.) directly to the display via the bus, according to the ARINC708 standard, with the flight display software parsing the radar data and generating weather-related graphics and displaying on the flight display screen. The method fully utilizes the existing flight display hardware platform, and the radar equipment does not need to be provided with a graphic processing function any more, so that the system cost can be obviously reduced.
However, the existing flight display hardware platform has the problem of insufficient performance of real-time rendering of weather radar information, and the hardware processing time is long, so that the rendering speed is low, and the real-time display of weather related graphics is affected.
Disclosure of Invention
In view of the above, the embodiment of the disclosure provides a real-time drawing method for ARINC708 radar information, which uses the existing main flight display platform to perform software analysis drawing on radar information, aims at solving the problems of low weather information rendering refresh rate, poor display effect caused by lack of data between adjacent scanning lines, and the like, uses software to perform data analysis and rapid rendering on weather radar information transmitted by standard ARINC708 data words based on the flight display OpenGL graphic library, improves the weather information drawing efficiency, enhances the weather information drawing effect, remarkably improves the rendering performance, and solves the problem of insufficient performance existing in real-time rendering of weather radar information under the existing flight display hardware platform.
In order to achieve the above object, the present invention provides the following technical solutions:
A real-time ARINC708 radar information drawing method comprises the following steps: the weather radar periodically transmits ARINC708 data words to the flight display, the flight display analyzes the ARINC708 data words, the information of scanning lines represented by the analyzed ARINC708 data words is filled into a weather information bitmap, and then the weather information bitmap is drawn in a texture mapping mode in an OpenGL graphic library;
the generation process of the weather information bitmap comprises the following steps:
(1) Taking the current position of the airplane as an origin, taking the right front of the airplane body as a Y axis, taking the right of the airplane as an X axis, and establishing an original coordinate system;
(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 resolved ARINC708 data word.
Further, the generating process of the weather information bitmap in step (3) further includes: copying the scanning line information leftwards or rightwards according to the current scanning direction of the radar, and filling gaps between two scanning lines.
Further, the step of filling the gap between the two scanning lines specifically includes:
(1) Calculating the color value of the pixel point on the current scanning line;
(2) Determining a radar scanning direction, increasing or decreasing a scanning angle by delta theta, and calculating a pixel point color value on a scanning line with an angle of (theta+delta theta) or (theta-delta theta);
(3) Repeating the step (2) for a plurality of 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 pixel point corresponding to the scanning line are calculated through conversion from polar coordinates to rectangular coordinates, and pixel information under the coordinate values is updated, so that weather information after the scanning line data is updated is obtained.
Further, weather radar information in a 90-degree scanning range in the target coordinate system is acquired.
Further, each ARINC708 data word has 1600 bits in total.
According to the ARINC708 radar information real-time drawing method, the existing main flight display platform is utilized to conduct software analysis drawing on radar information, and aims at the problems that the weather information rendering refresh rate is low, the display effect is poor due to the fact that data is lacking between adjacent scanning lines and the like, the weather radar information transmitted by standard ARINC708 data words is subjected to data analysis and fast rendering by software based on the flight display OpenGL graphic library, so that 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 fast analyze radar data, 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 that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is an ARINC708 data word bit field definition schematic;
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 fill between scan lines in accordance with the present invention;
Fig. 5 is a schematic diagram of a real-time drawing method of ARINC708 radar information in an embodiment of the invention.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the following 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 present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, 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. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the disclosure by way of illustration, and only the components related to the disclosure are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide 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 industry, and for reducing the cost, the weather radar information analysis and rendering are all arranged in a main flight display, and a special radar information analysis and image generation platform is not adopted.
The radar information is analyzed and drawn by software by utilizing the existing flight display hardware platform, the weather radar periodically transmits ARINC708 data words to the flight display, the format of the ARINC708 data words is shown in figure 1, each ARINC708 data word comprises 1600 bits, a plurality of fields, a representing label (label), a radar state, a measuring range, a scanning angle, a weather image on the angle (512 x 3 bits representing color values of 512 points on the current scanning line angle) and the like.
The weather radar information display needs to analyze ARINC708 data words, and updates pixel colors on corresponding scanning angles according to analysis results, and a weather radar coordinate system diagram in the prior art is shown in fig. 2. The flight display adopts a texture mapping mode in an OpenGL graphic library to draw, fills the image information of all scanning lines into a bitmap, and uses the bitmap as a texture to draw weather information.
By adopting the coordinate system of fig. 2, the rectangular coordinate value (x, y) of each pixel point corresponding to the scan line can be calculated through the conversion from the polar coordinate to the rectangular coordinate, and the weather information after updating the data of one scan line can be obtained by updating the pixel information under the coordinate value.
Calculating the length of the required texture in the X-axis using the coordinate system of FIG. 2The length in the Y-axis direction is 512. Since the OpenGL defined length used must be 2 n, the minimum size of the texture required for the coordinate system of fig. 2 is 1024×512, and the bitmap size is large, resulting in long hardware processing time and low weather information rendering refresh rate.
Based on this, as shown in fig. 3, an embodiment of the present disclosure provides a real-time drawing method for ARINC708 radar information, including: the weather radar periodically transmits ARINC708 data words to the flight display, the flight display analyzes the ARINC708 data words, the information of scanning lines represented by the analyzed ARINC708 data words is filled into a weather information bitmap, and then the weather information bitmap is drawn in a texture mapping mode in an OpenGL graphic library;
the generation process of the weather information bitmap comprises the following steps:
(1) Taking the current position of the airplane as an origin, taking the right front of the airplane body as a Y axis, taking the right of the airplane as an X axis, and establishing an original coordinate system;
(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 resolved ARINC708 data word.
Because of the scan angle (SCAN ANGLE) θ value transmitted by the ARINC708 data word, the forward direction of the fuselage is 0, the right wing direction is positive, and the left wing direction is negative. The angle theta of the scanning line corresponds to the angle in the coordinate system of fig. 3The coordinates corresponding to the pixel points with the distance R from the original point on the scanning line are calculated as follows:
x＝R cosβ
y＝R sinβ
Wherein R takes a value of 1-512 for indexing the color values of 512 points in the ARINC708 data word.
The drawing method of the embodiment can effectively reduce the size of the bitmap texture, reduce the hardware processing time, consider that the weather radar information only has a scanning range of 90 degrees, rotate the original coordinate system by 45 degrees anticlockwise, adopt the coordinate system shown in fig. 3, and the required texture size is 512 multiplied by 512, so that compared with the traditional algorithm, the texture size is reduced by half, and the rendering speed can be improved.
Because the weather radar ARINC708 adopts a polar coordinate form, in actual drawing, as shown in fig. 4, a large gap occurs at the tail portions of two scanning lines with the scanning angle θ 1,θ2 due to lack of data, so that the display effect is poor. To fill in the gap, interpolation may be used, and a linear interpolation algorithm is generally used between the two scan lines. However, since 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 are also required to be converted into a rectangular coordinate system after interpolation, the specific algorithm is complex, and the efficiency is low.
In a preferred embodiment of the present invention, the generating step (3) of 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 gaps between two scanning lines.
Further, the step of filling the gap between the two scanning lines specifically includes:
(1) Calculating the color value of the pixel point on the current scanning line;
(2) Determining a radar scanning direction, increasing or decreasing a scanning angle by delta theta, and calculating a pixel point color value on a scanning line with an angle of (theta+delta theta) or (theta-delta theta);
(3) Repeating the step (2) for a plurality of times until no gap exists between the two scanning lines.
The method for filling the gap between the two scanning lines is simple in principle and high in speed, and a good effect can be achieved.
The invention will be further illustrated with reference to specific examples. The ARINC708 weather radar information parsing and rendering implementation process is as follows, see FIG. 5:
1. Initializing: an array wxrBmp [512] [512] for storing the whole weather radar image information is established, the array element type is COLOR, the array element type comprises four COLOR components of RGBA, and all elements are cleared. Textures are created for weather radar image rendering.
2. ARINC708 data words are read and ARINC708 data words are read from the receive buffer on a periodic basis.
3. Determining a scanning direction: the received ARINC708 data word analyzes the scanning angle of the current radar according to the interface control file specification, and compares the current radar scanning angle with the scanning angle of the previous period, wherein the angle increase indicates that the radar antenna scans rightwards, and the angle decrease indicates that the radar antenna scans leftwards.
4. Updating wxrBmp elements: the polar coordinates are transformed into rectangular coordinates, as shown in figure 3, the polar coordinates r are ARINC708 data word color value serial numbers, the values are 1-512, and the angles areWhere θ is the current scan angle. The calculation formula is as described above. The color value of the corresponding sequence number of the ARINC708 data word is filled into the corresponding element wxrBmp.
5. Scan line copy: increasing the theta value, for example, 0.1 degree in the project, according to the scanning direction obtained in the step 3, if the scanning direction is rightward scanning, repeating the step 4 for a plurality of times with the increased theta value; if the scanning is to the left, the value of theta is reduced, for example, the value of theta is 0.1 degree in the project, and the step 4 is repeated for a plurality of times with the reduced value of theta.
6. Updating textures: and updating the weather radar texture with the updated wxrBmp.
7. Rendering a weather radar: the coordinate system is rotated 45 degrees, and the weather information is drawn by the updated texture.
In practical application, the process is infinitely circulated, and weather radar information is displayed on a flight display in real time.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the 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 disclosure are intended to be covered by the protection scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims (4)

1. The ARINC708 radar information real-time drawing method is characterized by comprising the following steps of: the weather radar periodically transmits ARINC708 data words to the flight display, the flight display analyzes the ARINC708 data words, the information of scanning lines represented by the analyzed ARINC708 data words is filled into a weather information bitmap, and then the weather information bitmap is drawn in a texture mapping mode in an OpenGL graphic library;
the generation process of the weather information bitmap comprises the following steps:
(1) Taking the current position of the airplane as an origin, taking the right front of the airplane body as a Y axis, taking the right of the airplane as an X axis, and establishing an original coordinate system;
(2) Rotating the original coordinate system by 45 degrees anticlockwise to obtain a target coordinate system;
(3) Generating the meteorological information bitmap on the target coordinate system according to the color information on the scanning line represented by the resolved ARINC708 data word;
The generating process of the weather information bitmap in step (3) further includes: copying the scanning line information leftwards or rightwards according to the current scanning direction of the radar, and filling gaps between two scanning lines;
The step of filling the gap between the two scanning lines specifically comprises:
(1) Calculating the color value of the pixel point on the current scanning line;
(2) Determining the radar scanning direction and increasing the scanning angle Or reduce/>The calculated angle is/>Or (b)Pixel point color values on a scan line of (a);
(3) Repeating the step (2) for a plurality of times until no gap exists between the two scanning lines.
2. The method for real-time drawing of ARINC708 radar information according to claim 1, wherein in step (3), a target coordinate system is adopted, rectangular coordinate values of each pixel point corresponding to a scan line are calculated through conversion from polar coordinates to rectangular coordinates, and pixel information under the coordinate values is updated to obtain weather information after updating the scan line data.
3. The ARINC708 radar information real-time rendering method according to claim 1, wherein weather radar information within a 90 ° scanning range in the target coordinate system is acquired.
4. The ARINC708 radar information real-time rendering method of claim 1, wherein each ARINC708 data word has 1600 bits in total.
CN202111636753.8A 2021-12-29 2021-12-29 ARINC708 radar information real-time drawing method Active CN114442102B (en)

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