TWI547708B - Eccentricity display azimuth scale drawing method - Google Patents

Description

Eccentric display azimuth scale drawing method

The invention relates to an azimuth scale drawing method, in particular to an eccentric display azimuth scale drawing method.

In the use of navigation radar, the backtracking and electronic chart information in front of the heading are more important than other directions. Some ship navigation radars have a heading upward display function, and the user can focus on the trace or sea of the display center. Figure information, if the navigation radar supports the eccentric display function, you can see a larger range of trace or chart information in front of the same distance scale. Therefore, if the radar has a center offset display (eccentric display) screen, the user observes the closest distance CPA (Closest Point of Approach) to the target and the time to closest point of approach (TCPA). The use of the electronic bearing line EBL (Electronic Bearing Line), the variable range scale VRM (Variable Range Marker) for the target measurement, etc., is more convenient than the central display mode.

At present, some of the existing navigation radar plane position indicators PPI (Plan Position Indicator) display does not support the center offset display function, or has a center offset display, but its azimuth scale only uses the azimuth scale of the center without offset, not Corresponding to the instantaneous offset and rotation, and failing to change the corresponding azimuth circle scale (still the azimuth scale of the center display), which may cause the user to misjudge the orientation or need another electronic orientation or distance marking. The tool EBL/ERL can re-measure the target to obtain the correct orientation, resulting in poor timeliness and unable to meet the immediate observation of the target. If the azimuth circle scale can be redrawed immediately, the user will face the true north or the heading. In the upper mode, the true orientation and related orientation of the target and the ship can be easily judged.

Related literature and patents refer to navigation radar plane position display (PPI) trace digital display with instant switching heading up and true north upward display mode, center offset trace digital display, combined with electronic chart information, etc. There is a reference to the center offset display function, but it is not taught in the center offset display, the method of calculating the eccentric azimuth scale and the instant redrawing the azimuth scale by the technique of the present invention.

In view of the above disadvantages of the prior art, the main object of the present invention is to propose an azimuth scale drawing method for rapidly updating the eccentricity when performing the center offset display, the instantaneous switching heading upwards and the true north upward mode and the chart rotation rotation. Scale. To enable the drawing platform to support the eccentric display function, whether in the true north or heading up mode, you can see a larger range of traces or chart information in front of the same distance scale, which is helpful in terms of human factors engineering. The user is interpreted on the navigation radar display.

Another main object of the present invention is to redraw the azimuth circle scale according to the current heading direction when the eccentric display is displayed, and the user can easily interpret the true orientation and related orientation of the target and the ship regardless of whether the true north direction or the heading upward mode. Use the electronic distance azimuth line tool to obtain fine target position information.

In order to achieve the above object, the present invention provides an eccentric display azimuth scale drawing method, which comprises providing a drawing platform, which can be a display screen, a drawable object plane, and the display screen can be a navigation radar screen, and can be drawn. The plane of the object may be paper, leather, table top, etc.; on the drawing platform, an orientation circle is drawn, the orientation circle includes a circle with a center point O and a radius R; in the azimuth circle, an eccentric point C is set a coordinate, calculating a distance r between the eccentric point C and the center point O; on the azimuth circle, setting an azimuth scale point A such that a triangle consisting of the center point O, the eccentric point C, and the azimuth point A The OAC mid-angle OCA is an azimuth angle ψ. Using the radius R, the distance r and the azimuth angle ψ, the eccentricity point C is calculated by the triangular cosine theorem to a length L of the azimuth scale point A; a coordinate, the length L and the azimuth angle ψ calculate a coordinate of the azimuth scale point A; and, move to the azimuth scale point A to draw an eccentric azimuth scale, and mark an eccentricity side of the eccentric azimuth scale Bit scale value.

The invention further provides an eccentric display azimuth scale drawing method, which comprises providing a drawing platform, which can be a display screen and a drawable object plane, the display screen can be a navigation radar screen, and the object plane that can be drawn can be For paper, leather, table top, etc.; on the drawing platform, draw a bearing circle, the azimuth circle includes a circle with a center point O and a radius R; in the azimuth circle, a coordinate of an eccentric point C is set, the eccentricity Point C extends toward the center point O and intersects the azimuth circle at an azimuth point B, and calculates a distance r between the eccentric point C and the center point O. On the azimuth circle, an azimuth point A is set, so that The angle between the center point O and the azimuth point A is an angle ω, and the angle OCA of the triangle OAC formed by the center point O, the eccentric point C and the azimuth point A is An azimuthal angle ψ, using the radius R, the distance r and the azimuth Degree ψ, the angle ω is calculated by a triangular sine theorem; the coordinates of the azimuth scale point A are calculated from the coordinates of the center point O, the radius R and the angle ω; and the eccentric azimuth scale is drawn to the azimuth scale point A And mark an eccentric azimuth scale value next to the eccentric azimuth scale.

According to the above two eccentric display azimuth scale drawing methods, the present invention further sets an angular interval value, and sequentially changes the azimuth angle 依 according to the angular interval value, and draws the eccentric azimuth scale of the azimuth angle 一 on the 360° azimuth circle. . In addition, in order to facilitate the user to interpret the map orientation, the present invention can provide a map data, which is drawn in the azimuth circle.

The above summary and the following detailed description are intended to further illustrate the manner, means and function of the present invention to achieve the intended purpose. Other objects and advantages of the present invention will be set forth in the description which follows.

S110~S160‧‧‧Steps

S210~S260‧‧‧Steps

O‧‧‧ Center of the heart

R‧‧‧ Radius

C‧‧‧eccentric point

A‧‧‧ azimuth point

B‧‧‧ azimuth point

L‧‧‧ length

R‧‧‧ length

ψ‧‧‧Azimuth angle

Ω‧‧‧ angle

The first figure is a flow chart of a method for drawing an eccentric display azimuth scale according to an embodiment of the present invention.

The second figure is a coordinate drawing of the eccentric display azimuth scale according to an embodiment of the present invention.

The third figure is a complete coordinate drawing of the 360° eccentric display azimuth scale according to an embodiment of the present invention.

The fourth figure is a flow chart of a method for drawing an eccentric display azimuth scale according to an embodiment of the present invention.

The fifth figure is a map showing and marking the eccentric azimuth scale numerical coordinate map of an embodiment of the present invention.

The embodiments of the present invention are described below by way of specific examples, and those skilled in the art can readily appreciate the other advantages and advantages of the present invention.

Embodiment 1 : Referring to FIG. 1 is a flow chart showing an eccentric display azimuth scale drawing method according to an embodiment of the present invention, and a second graph showing an eccentric display azimuth scale drawing coordinate diagram according to an embodiment of the present invention, and an eccentric display azimuth scale of the present invention. The drawing method comprises the following steps: Step (A) S110, providing a drawing platform; the drawing platform is a navigation radar screen, and step (B) S120, on the drawing platform, drawing a bearing circle, the bearing circle comprises a center circle Point O and a circle of radius R, step (C) S130 is within the azimuth circle, and a coordinate of an eccentric point C is set, and the direction of the line connecting the eccentric point C toward the center point O is the heading of the ship, and extends The azimuth circle intersects at an azimuth scale point B, and calculates a distance r between the eccentric point C and the center point O. In step (D)S140, an azimuth scale point A is set on the azimuth circle, such that the center point O, The angle OC of the triangle OAC formed by the eccentric point C and the azimuth scale point A is an azimuth angle ψ, and the radius R, the distance r and the azimuth angle ψ are obtained by the triangular cosine theorem R ² =L ² +r ² -2Lrcos ψ, calculate the eccentricity C Up to a length L of the azimuth point A, step (E) S150, calculating the coordinates of the azimuth point A from the coordinates of the eccentric point C, the length L and the azimuth angle ,, wherein the navigation radar is provided to provide the bow The heading angle is H, the X-axis coordinate of the azimuth scale point A is set to X _A , the Y-axis coordinate is Y _{A ,} etc., the X-axis coordinate of the eccentric point C is X _C , and the Y-axis coordinate is Y _C , then X _A = X _C +L*cos(H+ψ-360), Y _A =Y _C +L*sin(H+ψ-360), and step (F)S160, moving to the azimuth scale point A to draw an eccentric azimuth scale .

Embodiment 2: Please refer to the second figure, an eccentric display azimuth scale drawing coordinate diagram and a third figure according to an embodiment of the present invention. The 360° eccentric display azimuth scale drawing complete coordinate graph of one embodiment of the present invention, the present invention draws an eccentricity After the azimuth circle is drawn over the entire azimuth circle, the eccentric azimuth scale of the azimuth angle ψ is drawn according to the method of the first embodiment, and then an angular interval value i is set, and the azimuth angle is changed to (ψ+i), and then according to the step (D of the present invention) S140 to step (F) S160, draw an eccentric azimuth with an azimuth angle of (ψ+i), and then change the azimuth angle sequentially by increasing the angular interval value by 2i, on the 360° azimuth circle The eccentric azimuth scale of the azimuth angle ψ is drawn one by one, and the 360° eccentricity display azimuth scale circle is completed as shown in the third figure.

Embodiment 3: Referring to FIG. 4 is a flow chart showing an eccentric display azimuth scale drawing method according to an embodiment of the present invention, and a second graph showing an eccentric display azimuth scale drawing coordinate diagram according to an embodiment of the present invention, and an eccentric display azimuth scale of the present invention. The drawing method comprises the following steps: Step (A) S210, providing a drawing platform; the drawing platform is a navigation radar screen, and step (B) S220, on the drawing platform, drawing a bearing circle, the bearing circle comprises a center Point O and a circle of radius R, step (C) S230, in the azimuth circle, set a coordinate of an eccentric point C, the eccentric point C extending toward the center point O and intersecting the azimuth circle at an azimuth point B, calculating a distance r between the eccentric point C and the center point O, and step (D) S240, setting an azimuth scale point A on the azimuth circle, such that the azimuth scale point B passes the center point O and the azimuth scale The angle of the point A is an angle ω, and the angle OCA of the center point O, the eccentric point C and the azimuth point A is an azimuth angle ψ, ω=ψ+∠OCA, a radius R, the distance r and the azimuth angle ψ, Calculate the angle ω=φ+sin ^-1 (r sin(φ)/R) from the triangular sine theorem sin∠OCA/R=sin∠OAC/r, step (E)S250, from the coordinates of the center point O, The radius R and the angle ω calculate the coordinates of the azimuth scale point A, wherein the X-axis coordinate of the azimuth scale point A is set to X _A , the Y-axis coordinate is Y _A , and the like, and the X-axis coordinate of the center point C is X _o , the Y-axis coordinate is Y _o , then X _A =X _o +R*cos(ω), Y _A =Y _o +R*sin(ω), and step (F)S260, moving to the azimuth scale point A An eccentric azimuth scale.

Embodiment 4: Please refer to the second figure, an eccentric display azimuth scale drawing coordinate diagram and a third figure according to an embodiment of the present invention. The 360° eccentric display azimuth scale drawing complete coordinate graph of one embodiment of the present invention, the present invention draws an eccentricity The azimuth scale is over the entire azimuth circle, and after the eccentric azimuth scale of the azimuth angle ψ is drawn according to the method of the third embodiment, an angle interval value i is set, and the azimuth angle is changed (ψ+i), and then according to the step (D of the present invention) S240 to step (F) S260, draw an eccentric azimuth with an azimuth angle of (ψ+i), and then change the azimuth angle sequentially by increasing the angular interval value by 2i, on the 360° azimuth circle The eccentric azimuth scale of the azimuth angle ψ is drawn one by one, and the 360° eccentricity display azimuth scale circle is completed as shown in the third figure.

Embodiment 5: Referring to FIG. 5, a map display and an eccentric azimuth scale numerical coordinate map according to an embodiment of the present invention, the present invention further includes providing a map data, which is drawn in the azimuth circle, and further according to step (A) S110 to step (F) S160 or step (A) S210 to step (F) S260, after drawing an eccentric azimuth scale with an azimuth angle of ψ, further adding a step, marking an eccentric azimuth adjacent to the eccentric azimuth scale Scale value.

The above-described embodiments are merely illustrative of the features and functions of the present invention, and are not intended to limit the scope of the technical scope of the present invention. Modifications and variations of the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the claims described below.

S110~S160‧‧‧Steps

S210~S260‧‧‧Steps

Claims (12)

An eccentric display azimuth scale drawing method comprises the following steps: (A) providing a drawing platform; (B) drawing an azimuth circle on the drawing platform, the azimuth circle comprising a circle point O and a circle of a radius R; C) in the azimuth circle, set a coordinate of an eccentric point C, calculate a distance r between the eccentric point C and the center point O; (D) set an azimuth scale point A on the azimuth circle, so that the center point is Point O, the eccentric point C and the triangular OAC angle OCA formed by the azimuth scale point A are an azimuth angle ψ, and the eccentric point C is calculated by the triangular cosine theorem using the radius R, the distance r and the azimuth angle ψ a length L to the azimuth point A; (E) a coordinate of the azimuth point C from the coordinate of the eccentric point C, the length L and the azimuth angle ;; and (F) moving to the azimuth point A Draw an eccentric azimuth scale. The eccentric display azimuth scale drawing method according to claim 1, wherein the drawing platform is selected from one of a group consisting of a display screen and a drawable object plane or a combination thereof. The eccentric display azimuth scale drawing method according to claim 2, wherein the display screen is a navigation radar screen. The method for drawing an eccentric display azimuth scale according to claim 1, further comprising the step of providing a map data, which is drawn in the azimuth circle. The method for drawing an eccentric display azimuth scale according to claim 1, further comprising the step of marking an eccentric azimuth scale value next to the eccentric azimuth scale. The eccentric display azimuth scale drawing method according to claim 5, further comprising a step of setting an angular interval value, sequentially changing the azimuth angle 依 according to the angular interval value, and drawing one by one on the 360° azimuth circle The azimuth angle of the azimuth angle ψ. An eccentric display azimuth scale drawing method comprises the following steps: (A) providing a drawing platform; (B) drawing an azimuth circle on the drawing platform, the azimuth circle comprising a circle point O and a circle of a radius R; (C) setting a coordinate of an eccentric point C in the azimuth circle, the eccentric point C extending toward the center point O and intersecting the azimuth circle at an azimuth scale point B, and calculating the eccentric point C and the center point a distance r of the O; (D) setting an azimuth scale point A on the azimuth circle such that the angle between the center point O and the azimuth point A is an angle ω from the center of the circle Point O, the eccentric point C and the azimuth point O of the triangle OAC formed by the azimuth point A are an azimuth angle ψ, and the angle ω is calculated by the triangle sine theorem using the radius R, the distance r and the azimuth angle ;; (E) calculating a coordinate of the azimuth point A from the coordinates of the center point O, the radius R and the angle ω; and (F) moving to the azimuth point A to draw an eccentric azimuth scale. The eccentric display azimuth scale drawing method according to claim 7, wherein the drawing platform is selected from one of a group consisting of a display screen and a drawable object plane or a combination thereof. The eccentric display azimuth scale drawing method according to claim 8, wherein the display screen is a navigation radar screen. The eccentric display azimuth scale drawing method as described in claim 7 further includes a step of providing a map data, which is drawn in the azimuth circle. The eccentricity display azimuth scale drawing method as described in claim 7 further includes a step of marking an eccentric azimuth scale value next to the eccentric azimuth scale. The method for drawing an eccentric display azimuth scale according to claim 11 further includes a step of setting an angular interval value, sequentially changing the azimuth angle 依 according to the angular interval value, and drawing one by one on the 360° azimuth circle. The azimuth angle of the azimuth angle ψ.