CN115273559B - Method for carrying out virtual simulation on aircraft cabin head-up display - Google Patents
Method for carrying out virtual simulation on aircraft cabin head-up display Download PDFInfo
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- 238000005096 rolling process Methods 0.000 claims description 12
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
- G08G5/0073—Surveillance aids
Abstract
The invention belongs to the technical field of aircraft test flight monitoring, and relates to a programming algorithm for performing virtual simulation on an aircraft cabin head-up display. The method mainly comprises the steps of an imaging program algorithm, a pitching program algorithm, a rolling program algorithm, a front-end data driving acceptance step, a data network distribution step and the like. The real image of the invention synchronously reproduces the aircraft cabin head-up display on the monitoring computer of the client in real time, thereby bringing stronger sense of reality and feedback speed for ground command and monitoring personnel; meanwhile, the data sources of all monitoring split pictures are unified, the framework which mainly uses virtual head-up display and is fused with other monitoring pictures in the same monitoring terminal is realized, and all pictures run synchronously.
Description
Technical Field
The invention belongs to the technical field of aircraft test flight monitoring, and relates to a method for carrying out virtual simulation on an aircraft cabin head-up display.
Background
At present, an aircraft flight time load test system collects bus data of each system of an aircraft, after modulating and carrying, the bus data are sent to a ground receiving system, after being demodulated by the front end of a telemetry monitoring platform, original codes are converted into physical quantities by a server, and the physical quantities are distributed to a plurality of clients by a local area network. The real-time display of the traditional flight data client is mainly based on interfaces for directly displaying physical quantities, such as character scrolling, form refreshing, waveform display and the like, and real-time monitoring pictures of aircraft cabin simulation are gradually developed on some program development platforms in recent years. Along with the improvement of test flight test technology, higher requirements are also generated for a command monitoring system.
Disclosure of Invention
In order to enable a ground commander to intuitively sense various conditions such as pitching and rolling of airplane flight, the invention provides a method for carrying out virtual simulation on the plane cabin head-up display, which is more real and more intuitive than the existing monitoring picture and gives the commander an immersive feeling.
The technical scheme adopted by the invention is as follows:
a method for carrying out virtual simulation on an aircraft cabin head-up display comprises the following steps:
the first step is to analyze the picture of the scale band into pixel array, record the information in the data structure of "image data", and call with the development platform function to display the image in the proper position of the window.
And secondly, calculating the mathematical relation between the pixel number and the pitch angle of the unit scales of the scale belt, determining the value of each parameter in q=k x a+b, and calling a platform function to drive the scale belt to move up and down by the pitch angle. q is the position of the "rectangle" in the "image data" data structure, b is the distance of the upper boundary of the square from the rectangular scale band base map when the pitch angle a is equal to 0, and k is the value when q is equal to 0 and a is equal to 90 degrees.
And thirdly, calling a platform function, and driving the coordinate system where the scale belt is positioned to rotate by using the actually measured rolling angle.
The three steps complete the display preparation work of the virtual head-up display.
And step four, receiving data driving of the front end. The telemetry demodulation front end separates the PCM data stream from the carrier signal and transmits the PCM data stream to the graphics data processing ground station over the network. And then, the ground station data processing system performs recovery processing such as data extraction, engineering unit conversion and the like on the PCM data stream to finish the data processing work in the earlier stage.
And fifthly, setting according to the definition of a data interface and a network interface of a program, receiving physical quantity data broadcast by a telemetry front-end server by a network terminal, driving a virtual head-up display and other display controls, and displaying the data in real time for flight monitoring.
The real image of the invention synchronously reproduces the aircraft cabin head-up display on the monitoring computer of the client in real time, thereby bringing stronger sense of reality and feedback speed for ground command and monitoring personnel; meanwhile, the data sources of all monitoring split pictures are unified, the framework which mainly uses virtual head-up display and is fused with other monitoring pictures in the same monitoring terminal is realized, and all pictures run synchronously.
Drawings
Fig. 1 is an algorithmic graph of the roll-over procedure of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and technical schemes.
A method for carrying out virtual simulation on an aircraft cabin head-up display comprises the following specific steps:
step 1: algorithm for imaging procedure
The image resource required by the developed virtual aircraft cockpit display is a rectangular scale band base sketch, and the picture of the scale band needs to be resolved into a pixel array, and is contained in a data structure called image data. The data structure contains all information contents of the pixel map: i.e. image depth, color, rectangle.
Image depth: the color depth of an image, i.e., the number of bits of each pixel in the image, is specified, the effective value includes 1, 4, 8, and 24 bits per pixel, and the image depth determines how the image and color values are resolved.
Color: the RGB color value array corresponds to the value in the image, the number of bytes occupied is determined by the image depth, the image depth of the horizon simulation control is selected to be 24, the color of each pixel is described by 3 bytes, and the colors respectively represent a red value, a green value and a blue value.
Rectangular: the cluster contains the coordinates of the image area to be converted, the horizontal coordinates increasing to the right and the vertical coordinates increasing downwards.
The data structure carries most of information of the simulation control, and the whole process of imaging, pitching and rolling of the control is penetrated.
Step 2: algorithm of pitching program
When the program runs, the scale belt moves up and down to display the pitch angle at the time. The circle moves up and down along with the pitch angle a on the scale belt to form the display of the pitch angle, and the position relationship between the pitch angle and the circle on the scale belt is the corresponding relationship between the pitch angle and the rectangular position q in the image data structure. Because the device moves up and down and does not move left and right, the device can be simplified into the corresponding relation between the pitch angle a and the upper boundary of the rectangular vertical coordinate in the data structure of the image data. Can be summarized as the following linear function: q=k×a+b. b is the distance between the upper boundary of the square and the rectangular scale belt base map when the pitch angle a is equal to 0, k is the value when q is equal to 0 and a is equal to 90 degrees.
Step 3: algorithm for roll-over procedure
As shown in fig. 1, the rolling process is actually rotation of picture pixels, the image exists in a two-dimensional array form in the memory, and index values of all elements in the two-dimensional array can be used as coordinate values in a coordinate system, so that the array of the picture is projected into the coordinate system. As shown in fig. 1, the change of the two-dimensional array value of the image can be realized by a method of rotating pixel coordinates, and after the original coordinate system where any point P is located in the image rotates by θ (roll angle), the coordinates of P in the new coordinate system are as follows:
thereby achieving image rotation. X and y are coordinates of P points before airplane rolling, x 'y' is coordinates of P points after airplane rolling, R θ Is the rotation coefficient of the coordinates. Because the instrument rolls is actually the image rolls around the center, before the coordinates rotate, the center of the image array needs to be translated to the origin of coordinates, and after the rotation, the center of the image is translated to the original position.
Referring to the display information of the real aircraft head-up display and the suggestion of the commander, the program gives out the aircraft flight information such as the table speed, the ground speed, the Mach number, the total oil quantity, the attack angle, the overload, the course, the lifting speed, the field height, the sea height, the roll angle, the radio height and the like in the window of the virtual aircraft cabin head-up display, and displays the aircraft flight information in the forms of numerical values, sliding blocks, indicator lamps, meters, pointers and the like.
Step 4: accepting front-end data driving
The machine carries and gathers the transmitting equipment and gathers the original discrete quantity of each system of the aircraft and analog quantity data and then transmits to the ground, the ground aerial tracking system carries on the goal automatic tracking calculation through the tracking computer, meanwhile, the telemetering and demodulating front end separates out the PCM data flow in the carrier signal, and send PCM data flow to the figure data processing ground station through the network. And then, the ground station data processing system performs recovery processing such as data extraction, engineering unit conversion and the like on the PCM data stream to finish the data processing work in the earlier stage.
Step 5: network allocation of data
The external interface of the virtual aircraft cabin head-up display comprises a data interface and a network interface. The telemetry receiver demodulates the received data carrier wave and sends the demodulated data carrier wave to the telemetry front end, forms a frame synchronous data stream after bit synchronization and inverse transformation, converts the frame synchronous data stream into engineering quantity reflecting the real state of the airplane in a parameter attribute library of a server, and broadcasts the engineering quantity to each terminal through a local area network. The buffer area of the data interface of the virtual aircraft cabin head-up display receives physical values of parameters such as pitch angle, roll angle and the like transmitted by the local area network and valid bits of related parameters, and the network interface buffer area needs to input the IP address and port number of the computer. The control can exist in the form of an execution file, and can also be used by a calling program in the form of a dynamic link library and a static link library. The remote sensing monitoring platform front end demodulation and server conversion physical quantity of the ground receiving system is not limited, and the remote sensing monitoring platform front end demodulation and server conversion physical quantity is a display terminal which has complete functions and high simulation degree and can be independently executed.
Claims (2)
1. A method for carrying out virtual simulation on an aircraft cabin head-up display is characterized by comprising the following steps:
firstly, resolving a picture of a scale band into a pixel array, recording information in an image data structure, and calling by a development platform function to display an image at a proper position of a window;
calculating the mathematical relation between the pixel number and the pitch angle of unit scales of the scale belt, determining the value of each parameter in q=k x a+b, calling a platform function, and driving the scale belt to move up and down by the pitch angle; q is the position of a rectangle in the data structure of the image data, b is the distance between the upper boundary of the square and the rectangular scale belt base map when the pitch angle a is equal to 0, and k is the value when q is equal to 0 and a is equal to 90 degrees;
thirdly, calling a platform function, and driving the coordinate system where the scale belt is positioned to rotate by using the actually measured rolling angle;
step four, receiving data drive of the front end; the telemetry demodulation front end separates a PCM data stream in the carrier signal and sends the PCM data stream to the graphic data processing ground station through a network; then, the ground station data processing system performs data extraction and engineering unit conversion and restoration processing on the PCM data stream to finish the data processing work in the earlier stage;
and fifthly, setting according to the definition of a data interface and a network interface of a program, receiving physical quantity data broadcast by a telemetry front-end server by a network terminal, driving a virtual head-up display and other display controls, and displaying the data in real time for flight monitoring.
2. Method for virtually simulating an aircraft cabin head up according to claim 1, characterized by the following steps:
step 1: algorithm for imaging procedure
The image resource required by the developed virtual aircraft cabin head-up display is a rectangle scale band base sketch, the picture of the scale band is required to be resolved into a pixel array, and the pixel array is contained in a data structure called image data; the data structure contains all information contents of the pixel map: i.e. image depth, color, rectangle;
image depth: designating the color depth of the image, namely the number of bits of each pixel in the image, wherein the effective value comprises 1 bit, 4 bits, 8 bits and 24 bits of each pixel, and the image depth determines how to analyze the values of the image and the color;
color: the RGB color value array corresponds to the value in the image, the occupied byte number is determined by the image depth, the image depth of the horizon simulation control is selected to be 24, the color of each pixel is described by 3 bytes, and the colors respectively represent a red value, a green value and a blue value;
rectangular: the clusters contain coordinates of the image area to be converted, the horizontal coordinates increment to the right, and the vertical coordinates increment downward;
the data structure carries most of information of the simulation control, and the whole process of imaging, pitching and rolling of the control is penetrated;
step 2: algorithm of pitching program
When the program runs, the scale belt moves up and down to display the pitch angle at the time; allowing the circle to move up and down along with the pitch angle a on the scale belt to form display of the pitch angle, wherein the position relationship between the pitch angle and the circle on the scale belt is the corresponding relationship between the pitch angle and the rectangular position q in the image data structure; because the device moves up and down and does not move left and right, the corresponding relationship between the pitch angle a and the upper boundary of the rectangular vertical coordinate in the 'image data' data structure can be simplified; can be summarized as the following linear function: q=k×a+b; b is the distance between the upper boundary of the square and the rectangular scale belt base map when the pitch angle a is equal to 0, k is the value when q is equal to 0 and a is equal to 90 degrees;
step 3: algorithm for roll-over procedure
The rolling process is actually that the picture pixels rotate, the images exist in a memory in the form of two-dimensional arrays, and the index values of all elements in the two-dimensional arrays can be used as coordinate values in a coordinate system, so that the arrays of the pictures are projected into the coordinate system; the change of the two-dimensional array value of the image can be realized by a method of rotating pixel coordinates, and after the original coordinate system where any point P is positioned in the image with the changed two-dimensional array value rotates by a rolling angle theta, the coordinates of P in the new coordinate system are as follows:
thereby realizing image rotation; x and y are coordinates of P points before airplane rolling, x 'y' is coordinates of P points after airplane rolling, R θ Is a coordinate rotation coefficient; because the instrument rolls and is actually that the image rolls around the center, before the coordinates rotate, the center of the image array is required to be translated to the origin of coordinates, and after the rotation, the center of the image is translated to the original position;
referring to display information of a real aircraft head-up display and advice of a commander, a program gives out aircraft flight information of a gauge speed, a ground speed, a Mach number, total oil quantity, an attack angle, overload, a course, a lifting speed, a field height, a sea height, a roll angle and a radio height in a window of a virtual aircraft cabin head-up display, and the aircraft flight information is displayed in the forms of a numerical value, a sliding block, an indicator lamp, an instrument and a pointer;
step 4: accepting front-end data driving
The machine-mounted acquisition and emission device collects original discrete quantity and analog quantity data of each system of the aircraft and emits the data to the ground, the ground antenna tracking system carries out target automatic tracking calculation through a tracking computer, and meanwhile, the remote sensing demodulation front end separates PCM data flow in carrier signals and sends the PCM data flow to the graphic data processing ground station through a network; then, the ground station data processing system performs data extraction and engineering unit conversion and restoration processing on the PCM data stream to finish the data processing work in the earlier stage;
step 5: network allocation of data
The external interface of the virtual aircraft cabin head-up display comprises a data interface and a network interface; the telemetry receiver demodulates the received data carrier wave and sends the demodulated data carrier wave to the telemetry front end, forms a frame synchronous data stream after bit synchronization and inverse transformation, converts the frame synchronous data stream into engineering quantity reflecting the real state of the aircraft in a parameter attribute library of a server, and broadcasts the engineering quantity to each terminal through a local area network; the buffer area of the data interface of the virtual aircraft cabin head-up receives the pitch angle, the physical value of the roll angle and the effective bit of the related parameters transmitted by the local area network, and the network interface buffer area needs to input the IP address and the port number of the computer; the control can exist in the form of an execution file, and can also be used by a calling program in the form of a dynamic link library and a static link library; the remote sensing monitoring platform front end demodulation and server conversion physical quantity of the ground receiving system is not limited, and the remote sensing monitoring platform front end demodulation and server conversion physical quantity is a display terminal which has complete functions and high simulation degree and can be independently executed.
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