CN115470309B - Method for performing interactive three-dimensional flight simulation in EFB - Google Patents

Abstract

The invention discloses a method for carrying out interactive three-dimensional flight simulation in an EFB (edge-defined bus), belonging to the technical field of computer simulation. The method comprises the following steps: constructing an OsgEarth graphic platform under the iOS and Android environments; generating static tracks of airport taxiing, terminal area flying and airway flying; generating an OsgEarth dynamic flight track; and carrying out interactive three-dimensional flight simulation in the EFB equipment. The method can realize simulation and interactive control of the whole flight process, and has the advantages of low system resource occupancy rate and vivid restoration of a real flight scene.

Description

Method for performing interactive three-dimensional flight simulation in EFB

Technical Field

The invention relates to the technical field of computer simulation, in particular to a method for carrying out interactive three-dimensional flight simulation in an EFB (electronic engineering bus) through digitalized three-dimensional flight tracks and flight instructions.

Background

Flight simulation training is training activities which must be frequently carried out by pilots to keep flight skills, particularly flight tasks of large airports, high and altitude airports and complex terrain airports, and because ground sliding routes or terminal areas have complex flight procedures, a large number of manual operation projects are caused, mistakes and omissions are easy to happen, and the pilots are required to carry out high-frequency training. At present, pilots mainly carry out flight training through a simulation machine, the simulation machine is expensive, complex in process and short in time resource, training must be carried out in a specified place, and it cannot be guaranteed that all pilots, especially field pilots, are fully trained.

EFB is an abbreviation for Electronic Flight Bag (Electronic Flight Bag), an App application running on iOS or Android systems. The main function is to show flight data such as a chart and an operation manual for a pilot in an aircraft cockpit through portable equipment such as a tablet personal computer. Almost all pilots of all airlines in China are equipped with EFB equipment, and the unit scheduling and flight preparation of the pilots are performed on the EFB, however, at present, a three-dimensional flight simulation method running on the EFB is lacked, the pilots cannot perform basic flight training on the EFB, a means for previewing flight tasks is lacked, and previewing or strengthening training on ground taxiing of busy airports, terminal area flight of high altitude airports or complex terrain airports and airway flight is also lacked.

Citation document 1: the invention relates to a method for constructing a multimode navigation three-dimensional dynamic visual simulation platform, which comprises the following steps: CN106845032B. The invention discloses a flight simulation platform based on an OSG platform, which is used for building a three-dimensional digital earth by utilizing the OsgEarth platform and performing interpolation on a flight route to finish simulated flight. The method has the defects that a graphic platform is built based on VC + + and Microsoft MFC basic class libraries, and cannot run on an iOS or Android system. In addition, the method does not process the flight program track of the terminal area containing the arc turning, and the equidistant points and the arcs are generated by adopting the insertion points together with the airway flight, so that the accurate arc track of the flight program cannot be generated. In addition, the aircraft flies according to a great circle route in the air, and the method adopts a simple straight line equidistant interpolation method to cause the interpolation to deviate from the great circle route, thereby causing simulation distortion; meanwhile, the simulation process of the method cannot receive external message input, and interactive flight simulation cannot be realized.

Citation document 2: china invention, an EFB system based on Windows Modern UI, the disclosure number is: CN103995874A. This document discloses an EFB display system that displays terminal area maps such as a standard approach map, an off-site map, and an instrument approach map in pdf format. The invention has the defect that three-dimensional simulated flight simulation on the EFB cannot be realized.

Citation document 3: the invention relates to a portable electronic flight bag system suitable for a large airplane platform, which comprises the following components in part by weight: CN114443572A. This document discloses a method of rendering aeronautical elements on an EFB apparatus, which enables vector rendering of simple aeronautical chart elements. The invention has the defect that the simulated flight simulation of airport, terminal area and air route flight can not be realized.

Disclosure of Invention

In order to realize interactive flight simulation in the EFB, enable a pilot to be familiar with a flight task in advance and preview key operations in flight, the invention provides a method for interactive three-dimensional flight simulation in the EFB.

In order to achieve the purpose, the technical scheme of the invention comprises the following steps:

step 1: the OsgEarth graphic platform under the iOS and Android environment is built, and the OsgEarth graphic platform comprises the following steps:

compiling to generate an OsgEearth dynamic link library file under the iOS and Android environments; generating elevation tile and map tile data of a target area, and calling the elevation tile and the map tile in OsgEarth to form a three-dimensional digital earth; the map tile supports at least one of TMS, XYZ and GDAL formats, and includes at least one of satellite imagery, administrative zoning and elevation rendering.

Step 2: generating static tracks of 3 simulation stages of airport taxiing, terminal area flying and route flying, wherein the static tracks comprise passing points, control points and marking points; the passing points define the three-dimensional shape of the static track, the control points define manual operation information, and the marking points define prompt information. The airport taxiing static track is generated through AMDB data, the terminal area taxiing static track is generated through ARINC424 data, and the airway taxiing static track is generated through airliner data. The step 2 comprises the following steps:

step 2-1: manufacturing an airport sliding static track through AMDB data according to the actual machine type sliding route; four kinds of data of a TAXI guide LINE TAXI _ GUID _ LINE, a road surface road network ASRN, a TAXI waiting position TAXI _ HOLDING _ POSITON and a TAXI road cross identification TAXI _ INTERSECTION _ MARKING are extracted from AMDB data, the TAXI guide LINE cross point and the road surface road network node are set as passing points, the TAXI waiting position is set as a control point, and the TAXI road cross identification is set as a MARKING point. The control point sets information such as position, attention, instruction monitoring frequency and the like. The marking points are provided with information such as a road surface guide identification, a taxiway number, a machine type, a wingspan limitation and the like.

Step 2-2: acquiring ARINC424 codes of airport flight programs from civil aviation published data, setting parameters such as flight speed, turning radius, climbing rate and the like according to the performance of a simulation model, converting 23 kinds of flight path end codes of the ARINC424 codes into graphic data according to the parameters, and generating three-dimensional smooth curves of the flight programs to serve as terminal area flight static tracks. And setting each path point of the generated three-dimensional smooth curve of the flight program as a passing point. And setting the information identification of each navigation map as a marking point, wherein the marking point comprises information such as program names, positioning point names, directions and distances from the navigation station, speed or height limitation and the like. Setting 4 types of control points of a flap gear check point, an accelerator gear check point, an undercarriage folding and unfolding point and a missed approach decision point according to the model characteristics and a flight manual, and setting instruction information of each control point, wherein the instruction information comprises key operation information such as a flap gear, an accelerator gear, an undercarriage folding and unfolding point and operation steps, a missed approach decision point position and a decision basis, which are required to be set by each control point.

Step 2-3: the trend data of the airliner flight route between the specified take-off and landing airports is converted into an airway flight static track, each airway point is set as a passing point and a marking point, and each height layer conversion point and a control transfer point are set as control points. The marked point information comprises information such as the name of a waypoint, the safe height of a flight segment, the distance, the magnetic direction and the like. The control point comprises information of flight height to be converted, control handover frequency and the like.

Step 2-4: combining the static tracks of the take-off airport taxiing, the take-off terminal area flying, the air route flying, the landing terminal area flying and the landing airport taxiing into a complete static track staticPath; traversing each passing point of the StaticPath, and setting two adjacent passing points as P1 and P2; calculating Distance and direction Heading of points P1 to P2, solving gradient Grad between the two points according to height difference and Distance between the points P1 and P2, setting turning direction TurnDir of the points P1 to P2, setting TurnDir to be 0 if the points P1 and P2 are on a straight line segment, setting TurnDir to be 1 if the points P1 and P2 are on a section of clockwise arc line, and setting TurnDir to be-1 if the points P1 and P2 are on a section of counterclockwise arc line; assigning Distance, header, grad and TurnDir attribute values to P1; the other pass points are processed in the same way. Wherein the distance is used for controlling the simulation speed, and the direction, the gradient and the turning direction are used for controlling the attitude of the airplane model.

And step 3: generating a dynamic flight track under an OsgEarth graphic platform by adopting a great circle route interpolation algorithm, wherein the dynamic flight track comprises time information, position information and airplane attitude information, and the method comprises the following steps:

step 3-1: establishing a blank passing point list PathPointList, and adding the first passing point of the static track StaticPath into the PathPointList; the maximum dot pitch value δ is set. The maximum point distance value is set for effectively fitting the curvature of the earth, and because the static track is connected between two waypoints by a straight line, if the distance between the two waypoints is overlarge, the middle section of the connecting line is close to the surface of the earth and even is submerged underground. In order to keep the course always keeping the curvature of the earth, interpolation points are required to be arranged at specific intervals, and in order to keep the same course between the interpolation points and the original waypoints, a great circle course interpolation algorithm is required.

Step 3-2: traversing all the passing points of the StaticPath; two adjacent passing points are set as P1 and P2: calculating the distance lambda between P1 and P2, if lambda < = delta, adding P2 into PathPointList, if lambda > delta, inserting a passing point Pq between P1 and P2, and calculating Pq by a great circle route interpolation algorithm:

f = δ/λ

m=cos(λ)/sin((1-f)* λ)

n=sin(f*λ)/sin(λ)

r = m*cos(lon1)*cos(lat1) + n*sin(lat2) *cos(lon2)

q = m *sin(lat1)*cos(lon1) + n *sin(lat2)*sin(lon2)

w = m *cos(lat1)+ n *cos(lat2)

lat=atan2(w,sqrt(r^2+q^2))

lon=atan2(q,w)

alt=alt1+(alt1-alt2)*f

lat1, lon1, alt1, lat2, lon2 and alt2 are latitude, longitude and altitude of the point P1 and P2;

lat, lon and alt are latitude, longitude and altitude of Pq;

assigning the attribute values of head, grad and TurnDir of the P1 point to Pq;

adding Pq into PathPointList;

if the distance between the Pq and the P2 is more than delta, repeating the step 3-2 to calculate a new interpolation point Pq 'until the distance between the Pq' and the P2 is lambda < = delta;

and taking out the next point P3 from the static track, and executing the step 3-2 until all the passing points in the static track are processed.

Step 3-3: sequentially taking out each path point Pd in the PathPointList, and calculating the arrival time of the Pd according to the total distance and the simulation speed of the Pd; converting the longitude and latitude coordinates of Pd into OsgEearth world coordinates position; setting a position transformation matrix of the Pd according to the longitude and latitude and the height of the Pd; setting an attitude transformation matrix rotation of the Pd according to the attributes of the direction Heading, the gradient Grad and the turning direction TurnDir of the Pd; and generating a dynamic flight track point corresponding to the Pd according to the time, the position, the matrix and the rotation. And adding the dynamic flight track points corresponding to all the path points into the osg: (AnimationPath object) to obtain a dynamic flight track.

And 4, step 4: the method carries out three-dimensional flight simulation in the EFB, and the simulation process can receive interface information to carry out human-computer interaction, and comprises the following steps:

step 4-1: and drawing static flight track and marking point information on an OsgEarth graphic platform of the EFB.

Step 4-2: transmitting the dynamic flight trajectory into an OsgEarth callback function osgViewer, realize, and selecting to perform first-person simulation of the visual angle of a pilot by using an osgGA method or perform third-person flight simulation of the visual angle of an observer by using an osg method according to the input of an EFB interface;

setting thread at each control point to automatically suspend simulation in a first-person simulation mode, receiving an interface manual input instruction, and continuing simulation operation after judging the instruction is correct;

and loading the simulated airplane model in the third person simulation mode, and displaying corresponding instruction information on an interface when the flight simulation is carried out to a control point.

The invention has the following advantages:

according to the method, an OsgEearth graphic platform is introduced into an EFB to create a vivid simulation environment, the flight simulation of the whole stages of airport sliding, terminal area flight and airway flight can be performed, a smooth three-dimensional curve track is generated through ARINC424 coding, the flight track is ensured to be real and accurate through a great circle route insertion point algorithm, and the human-computer interaction simulation of key operation information can be realized through a control point. Therefore, the pilot can visually know the whole course of the task during flight preparation and drill key operation steps in a vivid environment. The method runs by relying on EFB portable equipment, so that a pilot can carry out flight training at any time and any place even in the air, the inconvenience that the pilot can only train on a professional flight simulator in the prior art is eliminated, and the method is greatly helpful for improving the level of the pilot and guaranteeing the flight safety.

Drawings

FIG. 1 is a diagram illustrating the main steps of a method for performing flight simulation in EFB according to an embodiment of the present invention.

FIG. 2 is a flow chart of a flight simulation process performed in EFB according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a three-dimensional digital globe built by an osgneearth graphics platform in EFB.

FIG. 4 is a schematic view of static taxi tracks of Beijing capital airport.

FIG. 5 is a schematic view of static flight trajectories at the airport terminal area of Beijing capital.

Fig. 6 is a schematic view of static flight trajectories from kyoto to lasagnogega.

FIG. 7 is a schematic diagram of a process for performing great circle route interpolation in two waypoints.

FIG. 8 is a schematic diagram of a first-person flight simulation.

Fig. 9 is a schematic view of a third person named flight simulation.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

When a pilot carries out a complex airport or a high altitude flight task, the operation is various, forgetting is easy to happen, high-frequency flight drilling and task familiarity need to be carried out, however, the flight training of the traditional simulator is limited by field and time resources, and a sufficient training opportunity cannot be provided for the pilot. The EFB is small and light, can be carried about, and becomes an indispensable tool for navigation chart browsing, manual consulting and flight preparing of pilots on the ground or in the air. If the flight simulation training can be carried out on the EFB, the training effect of the pilot can be more effectively improved, and the flight safety is improved. However, software or methods for performing flight simulation in EFB, particularly interactive three-dimensional flight simulation, are lacking.

Based on the above, the application provides a method for performing interactive three-dimensional flight simulation in an EFB, which can establish a three-dimensional digital earth in the EFB through an OsgEarth graphic platform, present flight tasks and key operation information of each stage of airport taxiing, terminal area flight and airway flight to a pilot in a three-dimensional flight simulation mode, and perform interactive simulation practice on key operation instructions, thereby improving flight safety.

As shown in fig. 1, one embodiment of the present invention comprises the steps of:

step 1: and constructing an OsgEarth graphic platform under the iOS and Android environments.

Step 2: and generating static tracks of 3 simulation stages of airport taxiing, terminal area flying and airway flying, wherein the static tracks comprise passing points, control points and marking points.

And step 3: and generating a dynamic flight track under the OsgEarth graphic platform by adopting a great circle route interpolation algorithm, wherein the dynamic flight track comprises time information, position information and airplane attitude information.

And 4, step 4: and carrying out three-dimensional flight simulation in the EFB, wherein the simulation process can receive interface information to carry out human-computer interaction.

In this embodiment, a boeing 737-800 model is selected as a simulation model (referred to as B738), and a detailed flow of the method is described by taking a flight task from a beijing capital airport to a lasagnga airport as an example.

The detailed flow of this embodiment is shown in fig. 2, and includes:

step 1: the OsgEarth graphic platform under the iOS and Android environment is built, and the OsgEarth graphic platform comprises the following steps:

and compiling to generate OSG and OsgEearth dynamic link library files under the iOS and Android environments, and loading the OSG and OsgEearth dynamic link library files into the EFB application.

Downloading a national elevation data TIF file from a national surveying and mapping bureau website, and cutting TIF format elevation data into TMS tile data by an osgearth _ package tool. And simultaneously downloading the TMS format national satellite image tile map file and the XYZ format administrative division tile map file from the website.

Calling TMS drive osgEarth, drivers, TMSOptions, XYZ drive osgEarth, drivers, XYZOppositions on an OsgEarth graphic platform of the EFB, and loading the elevation tiles and the map tiles into the OsgViewer to form the three-dimensional digital earth. As shown in fig. 3.

Step 2: generating static tracks of 3 simulation stages of airport taxiing, terminal area flying and route flying, wherein the static tracks comprise passing points, control points and marking points; the passing points define the three-dimensional shape of the static track, the control points define manual operation information, and the marking points define prompt information. The step 2 comprises the following steps:

step 2-1: an airport sliding static track is made according to an actual sliding route of a B738 model at Beijing capital airport, such as a white sliding route P103-Z4-F-A1-T2-K-RWY01 from an aircraft stand P103 to No. 01 track head shown in figure 4. The AMDB data of the Beijing capital airport is called from a database to extract four kinds of data of TAXI guide LINEs TAXI _ GUID _ LINE, road surface road network ASRN, TAXI waiting positions TAXI _ HOLDING _ POSITON and TAXI track cross identifications TAXI _ INTERSECTION _ MARKING. TAXI _ GUID _ LINE intersection points Z4-F, F-A1, A1-T2 and ASRN road network nodes are set as passing points, a TAXI waiting position WT is set as a control point, and a taxiway intersection mark is set as a marking point. The control point sets information such as position, attention, instruction monitoring frequency and the like. The marking points are provided with information such as a road surface guide identification, a taxiway number, a machine type, a wingspan limitation and the like.

Step 2-2: acquiring an departure flight program of a Beijing capital airport and ARINC424 codes of an approach flight program of a Lhasga airport from civil aviation published data, setting parameters such as a flight speed of 280 knots, a turning radius of 2 nautical miles and a climbing rate of 6.5% according to the model performance of B738, converting 23 aviation diameter end codes of the ARINC424 codes into graphic data according to the parameters, and generating a three-dimensional smooth curve of the flight program to serve as a terminal area flight static track. As shown in fig. 5, the path end codes such as CA, CD, FD, and TF are converted into a straight line graph, the path end codes such as CF, DF, AF, RF, and CR are converted into an arc graph, and the height is set for each point according to the published height information on the path graph, so as to form a three-dimensional smooth curve. And setting each path point of the generated three-dimensional smooth curve of the flight program as a passing point. And setting the information identification of each navigation map as a marking point, wherein the marking point comprises information such as program names, positioning point names, directions and distances from the navigation station, speed or height limitation and the like. Setting 4 types of control points of a flap gear check point, an accelerator gear check point, an undercarriage retraction point and a missed approach decision point according to B738 model characteristics and a flight manual, and setting instruction information of each control point, wherein the instruction information comprises key operation information such as a flap gear, an accelerator gear, an undercarriage retraction point and operation steps, a missed approach decision point position and a decision basis and the like which are required to be set by each control point.

Step 2-3: the flight route zba-ZULS-01 trend data from beijing capital to lasagnga airport was converted to the airway flight static trajectory as shown in fig. 6. Each waypoint is set as a waypoint and a mark point such as PABNI, an fomentation VOR, a dual-flow VOR, etc., and each height layer switching point and a control transition point are set as control points such as P539, P283, DOBSO, etc. The marking point information comprises information such as the name of the waypoint, the safe height of the flight segment, the distance, the magnetic direction and the like. The control point comprises information of flight height to be converted, control handover frequency and the like.

Step 2-4: combining the static tracks of the takeoff airport taxiing, the takeoff terminal area flying, the air route flying, the landing terminal area flying and the landing airport taxiing into a complete static track StaticPath. And traversing the path points of the StaticPath. As shown in FIG. 6, a Kingtang VOR (point P1) and a dual stream VOR (point P2) are calculated, a Distance value of 55 km and a direction Heading value of 234 degrees from the point P1 to the point P2 are calculated, a gradient Grad value of-0.36% between the two points is obtained from a height difference of-200 m and a Distance of 55 km between the point P1 and the point P2, and a turning direction Turndir is set to be 0 from the point P1 to the point P2 on a straight line segment. Assigning the Distance (55), the header (234), the Grad (-0.36%) and the TurnDir (0) attribute values to P1; the other pass points are processed in the same way. Wherein the distance is used for controlling the simulation speed, and the direction, the gradient and the turning direction are used for controlling the attitude of the airplane model.

And step 3: generating a dynamic flight track under an OsgEarth graphic platform by adopting a great circle route interpolation algorithm, wherein the dynamic flight track comprises time information, position information and airplane attitude information, and the method comprises the following steps:

step 3-1: establishing a blank passing point list PathPointList, and adding a first passing point P103 (airplane parking space of the capital airport of Beijing) of the static track StaticPath into the PathPointList; the maximum dot pitch value δ =20KM is set.

Step 3-2: traversing all the passing points of the StaticPath; let two adjacent via points be P1 and P2, such as the dual-stream VOR (point P1) to chongzhou VOR (point P2) in fig. 7: calculating the distance lambda between the P1 and the P2 to be 82KM >, 20KM, inserting a passing point Pq1 between the P1 and the P2, and calculating the Pq1 by adopting a great circle route interpolation algorithm:

f = δ/λ

m=cos(λ)/sin((1-f)* λ)

n=sin(f*λ)/sin(λ)

r = m*cos(lon1)*cos(lat1) + n*sin(lat2) *cos(lon2)

q = m *sin(lat1)*cos(lon1) + n *sin(lat2)*sin(lon2)

w = m *cos(lat1)+ n *cos(lat2)

lat=atan2(w,sqrt(r^2+q^2))

lon=atan2(q,w)

alt=alt1+(alt1-alt2)*f

substituting dual-stream VOR (lat 1=30.5453, lon1=103.899, alt1= 11000) and chongzhou VOR (lat 2=30.7312, lon2=103.2166, alt2= 12500) into the above formula, may obtain Pq1 (lat =30.6163, lon =103.779, alt = 11475);

assigning the attribute values of header, grad and TurnDir of the double-current VOR to Pq1;

adding Pq1 into PathPointList;

calculate the distance 54km >, 20km between Pq1 and P2 chow VOR, repeat step 3-2 to calculate new insertion points Pq2 (lat =30.664, lon =103.555, alt = 11815), and Pq3 (lat =30.732, lon =103.331, alt = 12110). The distance between Pq3 and Chong state VOR is 6.8KM < =20KM, and the insertion point is ended.

And taking out the next point P3 from the static track, and executing the step 3-2 until all the passing points in the static track are processed.

Step 3-3: and sequentially taking each path point Pd in the PathPointList, taking the double-flow VOR as an example, calculating the arrival time of the double-flow VOR =188.5 seconds according to the total distance 1885KM from the starting point to the double-flow VOR and the simulation speed of 10 KM/second.

The latitude and longitude coordinates of a dual-stream VOR (lat 1=30.5453, lon1=103.899, alt1= 11000) are converted to the osgnearth world coordinates position (x = -252391, y = -5587964, z = -3109595) by the osg:: ellipsoidModel:: convertland heighttoxyz method.

According to the longitude and latitude and the height of the dual-flow VOR, a position transformation matrix is formed by the osg method of Ellipsoid model, computer Local ToWorldTransform FromLatLongHeight; setting an attitude transformation matrix rotation according to the direction Heading (234), the gradient Grad (-0.36%) and the turning direction TurnDir (0) attributes of the dual-stream VOR; and generating a dynamic flight track point osg, an animation path, and a controlPoint corresponding to the dual-stream VOR according to the time, the position, the matrix and the rotation. And adding the dynamic flight track points corresponding to all the path points into the osg: (AnimationPath object) to obtain a dynamic flight track.

And 4, step 4: the method carries out three-dimensional flight simulation in the EFB, can receive interface information in the simulation process to carry out human-computer interaction, and comprises the following steps:

step 4-1: and drawing static flight track and marking point information on an OsgEarth graphic platform of the EFB.

Step 4-2: and (2) transmitting the dynamic flight trajectory into an OsgEarth callback function, and selecting to perform first-person simulation of the visual angle of a pilot by using an osgGA (interactive path manager) method or perform third-person flight simulation of the visual angle of a bystander by using an osg (interactive path Callback) method according to the input of an EFB (electronic data bus) interface.

And in the first-person simulation mode, setting thread at each control point to automatically suspend simulation, receiving an interface manual input instruction, and continuing simulation operation after judging the instruction is correct. As shown in fig. 8, at control point LS504, the simulation automatically pauses and the interface prompts for manual entry of flap position, and the simulation continues when the interface input character '3' is received. And after the simulation is finished, the EFB application manually inputs and scores statistics, the scores are recorded in the flight preparation record, and when the scores reach the full score, the EFB judges that the flight preparation is qualified.

In the third person-called simulation mode, a simulation airplane model is loaded, when the flight simulation is carried out to a control point, the interface displays corresponding instruction information, and as shown in fig. 9, when the simulation is carried out to control points such as LS819, LS811 and LS806, the operation instruction to be carried out automatically appears on the interface, and the memory of the pilot is enhanced.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (4)

1. A method for interactive three-dimensional flight simulation in an EFB (edge-based flash) is characterized by comprising the following steps of:

step 1: the OsgEarth graphic platform under the iOS and Android environments is built and comprises the following steps:

compiling to generate an OsgEearth dynamic link library file under the iOS and Android environments; generating elevation tile and map tile data of a target area, and calling the elevation tile and the map tile in OsgEarth to form a three-dimensional digital earth; the map tile at least supports one format of TMS, XYZ and GDAL, and at least comprises one style of satellite image, administrative division and elevation rendering;

and 2, step: generating static tracks of 3 simulation stages of airport taxiing, terminal area flying and route flying, wherein the static tracks comprise passing points, control points and marking points; the passing points define a three-dimensional shape of a static track, the control points define manual operation information, and the labeling points define prompt information; generating an airport sliding static track through AMDB data, generating a terminal area flying static track through ARINC424 data, and generating an airway flying static track through airliner data;

and step 3: generating a dynamic flight track under an OsgEarth graphic platform by adopting a great circle route interpolation algorithm, wherein the dynamic flight track comprises time information, position information and airplane attitude information;

and 4, step 4: and carrying out three-dimensional flight simulation in the EFB, wherein the simulation process can receive interface information to carry out human-computer interaction.

2. The method for interactive three-dimensional flight simulation in an EFB of claim 1, wherein step 2 comprises the steps of:

step 2-1: making the airport sliding static track through AMDB data according to the actual sliding route of the machine type; extracting four kinds of data of a sliding guide LINE TAXI _ GUID _ LINE, a road surface road network ASRN, a sliding waiting position TAXI _ HOLDING _ POSITON and a sliding road crossing identifier TAXI _ INTERSECTION _ MARKING from AMDB data, setting the sliding guide LINE crossing point and the road surface road network node as passing points, setting the sliding waiting position as a control point and setting the sliding road crossing identifier as a MARKING point;

step 2-2: acquiring ARINC424 codes of airport flight programs from civil aviation published data, converting 23 kinds of aviation diameter end codes of the ARINC424 codes into graphic data according to simulation machine type performance parameters, and generating three-dimensional smooth curves of the flight programs to serve as the static flight tracks of the terminal areas; setting all path points of a flight program as pass-through points, setting all chart information marks as marking points, setting 4 types of control points of a flap gear check point, an accelerator gear check point, an undercarriage retraction point and a missed approach break point according to model characteristics and a flight manual, and setting instruction information of all the control points;

step 2-3: converting trend data of an on-board flight route between a take-off airport and a landing airport into the static flight trajectory of the flight route, setting each flight route point as a passing point and a marking point, and setting each height layer conversion point and a control transfer point as a control point;

step 2-4: combining the static tracks of the take-off airport taxiing, the take-off terminal area flying, the air route flying, the landing terminal area flying and the landing airport taxiing into a complete static track staticPath; traversing all the passing points of the StaticPath, and setting two adjacent passing points as P1 and P2; calculating Distance and direction Heading of points P1 to P2, solving gradient Grad between the two points according to height difference and Distance between the points P1 and P2, setting turning direction TurnDir of the points P1 to P2, setting TurnDir to be 0 if the points P1 and P2 are on a straight line segment, setting TurnDir to be 1 if the points P1 and P2 are on a section of clockwise arc line, and setting TurnDir to be-1 if the points P1 and P2 are on a section of counterclockwise arc line; assigning Distance, header, grad and TurnDir attribute values to P1; the other pass points are processed in the same way.

3. The method for interactive three-dimensional flight simulation in an EFB of claim 1, wherein step 3 comprises the steps of:

step 3-1: establishing a blank passing point list PathPointList, and adding the first passing point of the static track StaticPath into the PathPointList; setting a maximum point distance value delta;

step 3-2: traversing all the passing points of the StaticPath; two adjacent passing points are set as P1 and P2: calculating the distance lambda between P1 and P2, if lambda < = delta, adding P2 into PathPointList, if lambda > delta, inserting a passing point Pq between P1 and P2, and calculating Pq by a great circle route interpolation algorithm:

f = δ/λ

m=cos(λ)/sin((1-f)* λ)

n=sin(f*λ)/sin(λ)

r = m*cos(lon1)*cos(lat1) + n*sin(lat2) *cos(lon2)

q = m *sin(lat1)*cos(lon1) + n *sin(lat2)*sin(lon2)

w = m *cos(lat1)+ n *cos(lat2)

lat=atan2(w,sqrt(r^2+q^2))

lon=atan2(q,w)

alt=alt1+(alt1-alt2)*f

lat1, lon1, alt1, lat2, lon2 and alt2 are latitude, longitude and altitude of the point P1 and P2;

lat, lon and alt are latitude, longitude and altitude of Pq;

assigning the attribute values of head, grad and TurnDir of the P1 point to Pq;

adding Pq into PathPointList;

if the distance between the Pq and the P2 is more than delta, repeating the step 3-2 to calculate a new interpolation point Pq 'until the distance between the Pq' and the P2 is lambda < = delta;

taking out the next point P3 from the static track, and executing the step 3-2 until all the passing points in the static track are processed;

step 3-3: sequentially taking out each path point Pd in the PathPointList, and calculating the arrival time of the Pd according to the total distance and the simulation speed of the Pd; converting the longitude and latitude coordinates of Pd into OsgEearth world coordinate position; setting a position transformation matrix of the Pd according to the longitude and latitude and the height of the Pd; setting a posture transformation matrix rotation of the Pd according to the Heading, grad and TurnDir attributes of the Pd; generating dynamic flight track points corresponding to the Pd according to the time, the position, the matrix and the rotation; and adding the dynamic flight track points corresponding to all the path points into the osg: (AnimationPath object) to obtain a dynamic flight track.

4. The method for interactive three-dimensional flight simulation in an EFB of claim 1, wherein step 4 comprises the steps of:

step 4-1: drawing static flight track and marking point information on an OsgEarth graphic platform of the EFB;

step 4-2: transmitting the dynamic flight trajectory into an OsgEarth callback function, and executing a first person simulation mode performed at the view angle of a pilot or a third person simulation mode performed at the view angle of an onlooker according to the selection of an EFB interface;

under a first-person simulation mode, when the flight simulation is carried out to any control point, the simulation is automatically suspended, and the simulation continues to run after a correct instruction is manually input;

and loading the simulated airplane model in the third person simulation mode, and displaying corresponding instruction information on an interface when the flight simulation is carried out to a control point.

Images