KR100613884B1 - Indication method of actual flight path on Jeppesen chart - Google Patents

Abstract

The disclosed invention includes computing a range of longitude and latitude of a Jeppesen chart image, setting a virtual two-dimensional plane having a longitude / latitude coordinate system on the window, Mapping an actual flight path on a latitude / longitude coordinate system using a latitude / longitude coordinate value by an INS (Initial Navigation System) mounted on an aircraft or a latitude / longitude coordinate value by GPS do.

According to the present invention described above, it is possible to perform intuitive and accurate flight analysis by comparing with a standard flight chart through computer animation, and it is possible to perform a final approach approach to the airport through such standard flight, .

Jeppesen chart, longitude / latitude range, two-dimensional plane, actual flight path, mapping, shift, Flight Track.

Description

Indication method of actual flight path on Jeppesen chart [

1 is a flowchart of a method of displaying an actual flight path on a Jeppesen chart according to an embodiment of the present invention.

2 is an example of a Volson chart applied to the present invention, and is a VOR / DME flight chart of a real Incheon airport runway.

3 is a diagram for explaining the light / latitude range calculation step shown in FIG.

FIGS. 4A and 4B are views showing a time before and after a shift in the flight path display step shown in FIG. 1. FIG.

The present invention relates to a module for flight information analysis and 3D image viewing system, and more particularly, to a module for flight information analysis and 3D image view system, And a method of drawing a route.

Flight Data Analysis & Animation System (FDAS) is a flight information analysis and animation system that uses data recorded on storage devices (QAR, CVR, etc.) Flight, and takeoff and landing situations) on an external screen or on a computer monitor so that the pilot's good, wrong, and pilot's habits are confirmed and reflected in pilot training.

Conventional flight analysis mostly relies on the subjective analysis ability of the experts through the text data of the tabular form according to time, or analysis by manually created graphical data.

In particular, the comparison and analysis of the Jeppesen Chart and the actual flight on the standardized flight around the airport for the flight path analysis had to be done by a direct comparison between the chart and the data, but this comparison was not possible, And only the approximate tendency could be grasped.

In order to solve the above-described problems, the present invention, which is devised to solve the above-described problems, is to project a light / latitude coordinate system of a WGS84 earth model on a two-dimensional plane, The purpose of the present invention is to provide a method of displaying actual flight paths on the 젭Son chart for direct comparison / analysis between the two.

In order to accomplish the above object, the present invention draws a Jones chart of an airport on a two-dimensional plane having a latitude / longitude coordinate system of the WGS84 earth model, and then draws the top / longitude coordinates of the actual flight path.

1 is a flowchart of a method of displaying an actual flight path on a Jeppesen chart according to an embodiment of the present invention.

In the present invention, WGS84 is used as an elliptical model of the earth, and a geographic coordinate system is used as a coordinate system.

As shown, a step S102 of calculating a range of a longitude and a latitude of a Wanson chart image and a step of setting a virtual two-dimensional plane having a longitude / latitude coordinate system on the window (S106) of mapping an image of the Jamson chart on a latitude / longitude coordinate system (S106), and a latitude / longitude coordinate value by an INS (Initial Navigation System) (S018) of drawing the actual flight path on the latitude / longitude coordinate system using the actual flight path.

First, the range / latitude range calculation step (S102) of the Wilson chart image will be described.

2 is an example of a Volson chart applied to the present invention, and is a VOR / DME flight chart of a real Incheon airport runway.

3 is a diagram for explaining calculation steps of the longitude / latitude range shown in FIG.

Here, the Jeppesen Chart is a flight chart that is used by most commercial operators and pilots as a flight (instrument flight) standard. It can be used for Enroute Chart, Standard Instrument Departure (SID) chart, STAR Arrival charts, Instrument Approach charts, and Airport charts are available by airport.

These charts include flight rules and routes for the flight in question.

In addition, the VHF Omni-directional Range (VOR) is a navigational safety facility that provides azimuth from the base and the Distance Measuring Equipment (DME) is the distance to the navigation facility.

As shown in Fig. 2, the x-ray chart includes two or more reference coordinate points each in the horizontal / vertical direction.

Using this point, we can calculate the range of the latitude and longitude of the Jensen chart image by the pixel value of the image and the reference coordinate point.

은 이미지 좌측 하단의 위도값,

,

는 이미지에 표시된 위도값,

은 첫 번째 값과 끝점 사이의 픽셀값,

은 이미지에 표시된 두 값 사이의 픽셀값 그리고

는 두 번째 값과 끝점 사이의 픽셀값을 나타낸다.3,

The latitude value at the lower left of the image,

,

Is the latitude value displayed in the image,

Is the pixel value between the first value and the end point,

Is the pixel value between the two values shown in the image, and

Represents the pixel value between the second value and the end point.

The pixel value can be easily obtained from separately developed software or an image tool such as a paint board included in a window.

이므로 이미지 좌측 하단의 위도값은 수학식 1에 의해 계산된다. here,

The latitude value at the lower left of the image is calculated by Equation (1).

=542 pixel,

=14 pixel,

=37-20(=37.333333),

=37-30(=37.500000)인 경우, 수학식 1에 의해 좌측 하단의 위도값인

값을 구할 수 있다.E.g,

= 542 pixels,

= 14 pixels,

= 37-20 (= 37.333333),

= 37-30 (= 37.500000), the lower left latitude value

Value can be obtained.

Calculate the light / latitude coordinates of the lower left and upper right points of the image in the same way as above.

(S104) of setting a virtual two-dimensional plane having a next diagonal / latitude coordinate system on the window will be described.

Since only a very local area (about 50 km * 50 km) of the airport is displayed on the screen among the entire districts of the present invention, a coordinate system can be set on the window by creating a virtual grid line on the two-dimensional plane.

In addition, by representing double-type data of the range of -180 to +180 in the hardness area (X axis) and the range of -90 to +90 in the latitude area (Y axis), / The latitude coordinates are displayed at once.

Then, the following scale factor is used in order to apply the portion where the magnitude proportion with the hardness changes as the absolute value of the latitude increases.

는 경도축의 스케일 인자,

는 화면 확대/축소를 위한 줌 인자(zoom factor),

은 현재 화면의 위도값이고,

인 경우, 위도축의 스케일 인자는 수학식 2에 의해 구한다.

Is the scale factor of the longitudinal axis,

A zoom factor for zooming the screen,

Is the latitude value of the current screen,

, The scale factor of the upper slaughter is obtained by the following equation (2).

는 원주율로서 3.1415926535이다.here

Is 3.1415926535 as the circumference ratio.

The following step (S106) of mapping the next Jensen chart image on the longitude / latitude coordinate system will be described.

In the present invention, the mapping of the latitude and longitude coordinates of the Jones chart image uses OpenGL's texture mapping technique.

Texture mapping is a method of covering an image on a polygon drawn in arbitrary coordinate system. Since it is drawn in exact coordinate value when drawing a polygon, when the image is put on a ratio of 1: 1, the image corresponding to the coordinate value is drawn .

In more detail, the coordinate values of all the Jensen chart images are calculated from Equation (1) and stored as a separate file.

At this time, "AAA.jpg & AAA.txt" is a pair of a chart image file and a coordinate file, respectively, and forms a folder for each airport.

Set the coordinate system corresponding to the longitude / latitude area (X axis: -180 to + 180, Y axis: -90 to +90) in the window that created the next OpenGL view.

Next, a tetragonal polygon corresponding to the chart area is formed in the corresponding two-dimensional coordinate system, and an image corresponding to the coordinate value of each corner is drawn by mapping the image onto the polygon.

Since the ellipsoidal earth is implemented as a two-dimensional coordinate system spread on a plane, the interval of hardness becomes narrower as the latitude value approaches the pole (south / north) region near the equator.

In the present invention, in order to apply such a phenomenon, when a drawing is performed using OpenGL, a scale factor is designated and scaled and drawn.

Next, a description will be given of the step (S018) of drawing the actual flight path in the longitude / latitude coordinate system.

The flight path recorded on the aircraft is divided into INS (Initial Navigation System) and longitude / latitude information by GPS (Global Positioning System).

Currently, INS is installed in most airplanes, but accurate GPS is not installed except for the latest aircraft.

Since the INS is a method of adding position information calculated based on the initial position information, the cumulative error occurs and the tendency of the flight trajectory is similar to the actual one, but the absolute position value includes an error.

In order to correct the error value of the INS, the present invention provides a shift function to move the flight trajectory of the aircraft as a whole.

The INS error is an accumulated error over time.

In other words, the overall flight path is normal, but when the initial position is not correct, the entire flight path is shifted by the initial error value, and the error range calculated according to the time increases.

In the present invention, the user can arbitrarily move the flight trajectory by an initial error value in order to correct the error of the initial error value.

And the relatively short time flight data in the vicinity of the airport is handled, it is assumed that the error increase over time can be ignored.

As shown in FIGS. 4A and 4B, it can be seen that the user has shifted the flight trajectory shifted by the initial error value by the shift function.

As described above, according to the present invention, intuitive and accurate flight analysis can be performed by comparing with the standard flight chart through computer animation by avoiding the approximate flight path analysis using existing text data.

This standard operation also enables a stable final approach to the airport, which can be of practical assistance to safe navigation.

Claims (6)

A first step of setting a diagonal / latitude coordinate value of a lower left and upper right point of a Jeppesen chart image including two or more reference coordinate points using the reference coordinate point; A second step of setting, on the window, a virtual two-dimensional plane having a longitude coordinate value of -180 ° to + 180 ° and a latitude coordinate value of -90 ° to + 90 °; Mapping the xvs chart image to the virtual two-dimensional plane so that the tilt / latitude coordinate values of the lower left and upper right points of the Jamson chart image match the tilt / latitude coordinate values of the virtual two-dimensional plane A third step; And (4) that displays an actual flight path, which is a set of longitude / latitude coordinate values measured by an INS (Initial Navigation System) or a GPS (Global Positioning System) mounted on an aircraft, on a Mullens chart image matched to the virtual two- ≪ / RTI > In the first step, The latitude value of the lower left point of the image is set by the following equation, Wherein a hardness value of a lower left point and a longitude / latitude value of a right upper point of the Jones chart image are set by a method of setting a latitude value of a lower left point of the Jones chart image, Display method.

here,

Is the latitude value at the bottom left of the image of the Epson chart,

Is the latitude value of the first reference coordinate point,

Is the latitude value of the second reference coordinate point,

Is a Y-axis pixel value between the first reference coordinate point and the bottom of the Wilson chart image,

Denotes a Y-axis pixel value between a first reference coordinate point and a second reference coordinate point, The first reference coordinate point is located at a lower latitude than the second reference coordinate point. delete delete 2. The method according to claim 1, A virtual two-dimensional plane to which a scale factor is applied is set on a window in which a magnitude proportional to a hardness coordinate value changes as the latitude coordinate value changes, Wherein the scale factor is set by the following equation.

here,

Is the scale factor of the longitudinal axis,

A zoom factor for enlarging and reducing the screen,

Is the scale factor of the upper slaughter,

Is the latitude value of the current screen,

Is the circumference. 2. The method according to claim 1, Wherein the mapping is performed using texture mapping technique of OpenGL. The method as claimed in claim 1, And if the actual flight path is a coordinate value measured by the INS, the actual flight path is moved and displayed as an entirety of the initial error value of the INS.

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