JPH0445112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for displaying the track of a moving object using radar or the like.

[Prior Art] The first conventional example of a device for displaying the track of another ship on a display screen such as a radar is, for example, in October 1971.
This was described in a paper titled ``About a plotting tracking device used in conjunction with radar,'' published in the journal of the Institute of Electronics and Communication Engineers, dated April 29th. In this conventional example, the position of another ship on the cathode ray tube of the radar is measured at predetermined time intervals, and the data is sequentially stored in a memory. The stored data is configured to display on the cathode ray tube the positions of each of the past five points in time counting from the current data. The past data stored in the memory is sequentially erased from the oldest data each time new data is entered, always leaving data for the five most recent positions. The display on the cathode ray tube is, for example, a white dot with a predetermined diameter, and the five white dots indicating the past five positions display the track. FIG. 5 shows the display situation of this conventional example.

A second conventional example of a track display device is the
57 There is one shown in Publication No. 18597. In this conventional example, the positions of multiple other ships are measured at predetermined time intervals, the position data of each other ship is stored in memory, and the images representing the current positions of other ships and the past positions are combined. It is configured to display images representing a certain wake on a color CRT in mutually different tones. In other words, the current position and past position of each ship are determined based on the difference in color.

Furthermore, as a third conventional example, JP-A No. 61-26878
There is one shown in the publication. In this conventional example, in order to identify a plurality of target echoes captured by the radar, a target number is assigned to each image, and the assigned target number is displayed near the image.

[Problems to be Solved by the Invention] In the first conventional example, the wake is displayed as an image of the same shape and a single color. When there is convergence, the individual wakes on the CRT may become indistinguishable.

In the second conventional example, the current positions and past positions of a plurality of other ships are displayed in different colors, making it possible to determine the direction of travel of the other ships. However, in order to display in color, an expensive color CRT must be used. Further, the circuit structure required for signal processing for color display becomes complicated, which requires the use of a color cathode ray tube, and together with this, the apparatus becomes expensive.

In the third conventional example, when a plurality of echo images are displayed very close to each other, there is a possibility that the target numbers 22 displayed near them may be confused.

In order to avoid such a risk, in this cited example, if we assume that the target number 22 is displayed superimposed on the target echo image 10, then the target echo image 10
Since numbers such as “1”, “2” or “3” are displayed superimposed on
The display looks like “” and is difficult to identify. Furthermore, in some cases, the numbers and the target echo may overlap and appear to be different numbers, leading to misunderstandings.

[Means for Solving the Problems] A track display device such as a radar according to the present invention uses a character generator to generate a mark signal corresponding to at least one kind of mark to be displayed in a predetermined shape on a display surface. The position of the image of the observed object is selected by the cursor means, and marks of different predetermined shapes are assigned to each image of the observed object on the display surface by the operating means. Position data indicating the position of at least one object image at each predetermined time and a mark of a predetermined shape assigned to the image of the object to be observed are stored in a memory, and the position data stored in the memory at each predetermined time is stored in a memory. When the latest position data is input to the memory, the control means controls so that the oldest position data stored in the memory is erased, and the predetermined position data is displayed on the display surface of the radar etc. based on the position data in the memory. [Operation] A corresponding mark is assigned to each object image on the display surface, and the position at each predetermined time is a dotted line pattern of multiple images of that mark. is displayed.

[Embodiment] FIG. 1 shows a display surface in an embodiment of the track display device of the present invention. In the figure, the center 10 of the display surface
is the position of the own ship, and line 11 is the bow line indicating the bow direction. For example, the wake image 12 represented by a plurality of squares is an image of a ship crossing the left front of the own ship. Further, for example, the wake image 13 represented by a plurality of triangles represents another ship that is about to cross in front of the own ship. Further, behind the own ship, there is a wake image 14 represented by, for example, a plurality of circles, which represents ships proceeding behind the own ship in the same direction.

FIG. 2 shows a block diagram of the structure of this embodiment. In the figure, a mark position selection device 21, a mark type selection switch 22, and a mark type (square, triangle, circle, etc.) and position setting switch 23 are all operating devices, and are designed to be easily operated by switches or the like. ing.
The CPU 24 is a central processing unit and controls the entire device. The RAM 25 is a memory for the CPU 24. The character generator 26 is a circuit that generates a mark figure such as a triangle or a square shown in FIG. 1, and a mark type selection switch 22 selects any one type from n types of marks. The memories 30-1, 30-2...30-n are memories corresponding to the marks of the character generator 26, and for example, the memory 30-1 stores the position of the ship to which the first mark is assigned at predetermined time intervals. to memory. The memory 30-2 also stores the positions of other ships to which the second mark has been assigned at predetermined time intervals. A memory map of the memories 30-1...30-n is shown in FIG. In the figure, the type of mark is stored in column 40. Column 41 stores data for each position at predetermined time intervals. The column 42 stores the temporal order of the positions, with the rank "1" representing the newest position and the rank "K" representing the oldest position. Then, the latest position data is memorized at the address with the position time order "K", and when the latest position data is memorized at the address with the rank "K", the order of each address is sequentially moved down, and the time of the position is The old position data is moved to the address with target rank "K". The calling address counter 27 is a counter that sequentially calls the memories 30-1...30-n. The switch circuit 29 is a changeover switch in which n switches are operated in conjunction with each other, and includes the mark position selection device 21, mark type selection switch 2, and
2, and mark type and position setting switch 2
3 to update data, switch to contact A, and to display data stored in memories 30-1...30-n on cathode ray tube 20, switch to contact B. Memory 30-1...3
The signal is transferred to the mark signal buffer 32 of 0-n, and is input to the CRT 20 together with the video signal from the radar video circuit 34 in synchronization with the signal from the radar scanning circuit 33. The deflection circuit 28 is a circuit for deflecting the CRT 20 and is operated by a signal from the radar scanning circuit 33.

Next, the operation of this embodiment will be explained. First, the mark position selection device 21 selects the CRT 20.
Move the cursor 21A in the image to match the image of the other ship to be measured. Next, if a rectangular mark, for example, is selected using the mark type selection switch 22, and the mark type and position setting switch 23 is operated in this state, the rectangular mark that has just been set is assigned to the ship, and the memory 30
-1, its mark and position are memorized. Next, for the second ship, operate the mark position selection device 21 and mark type selection switch 22 in the same manner as described above, select triangle as the mark type, and operate the mark type and position setting switch 23. Ship marks and positions are stored in memory 30
-2. In this way, the positions and mark types of a plurality of ships are selected and stored in the memory 30-1.
...30-n are sequentially stored in memory. By repeating this operation, for example every few minutes, the positions of these ships can be memorized every few minutes. Next, when the changeover switch 29 is switched to "B", the data in the memories 30-1 . . . 30-n is displayed on the cathode ray tube 20 via the mark signal buffer 32. 1st
In the figure, the image 12 displays the position of the first other ship as a rectangle. Also, video 13 is the second
The position of the ship is indicated by a triangle. In these displays, there are five rectangular and triangular marks each, so the temporal order of the memory map positions shown in FIG. 3 is from "1" to "5", and therefore "K" is "5". ”. Note that the data stored in the memories 30-1...30-n are based on the X-
Either the Y coordinate or polar coordinates may be used.

FIG. 4 shows a flowchart of the above operation.

In this embodiment, the direction of travel is determined by making the size of the marks generated by the character generator 26, for example, the largest for the mark corresponding to the latest position and the smaller for the marks corresponding to the oldest position data. can do. In this case, the character generator 26 is provided with mark data corresponding to a plurality of marks of different sizes for each mark, and the CPU 24 selects predetermined mark data corresponding to the value of the rank "K". .

Another display method is to display only the mark corresponding to the latest position data as a different mark for each ship, and the mark corresponding to the older position data to be displayed as a common mark for each ship, such as a small circular image. By displaying this, the direction of travel can be determined. In this case, the CPU 24 controls so that only the mark corresponding to the position data with the rank "1" is selected as the one specified for each ship, and the same mark is selected for the position data other than the rank "1". be done.

[Effects of the Invention] According to the present invention, images of other ships displayed on the display surface of a radar etc. are displayed as triangles or squares, for example, so that it is possible to display a plurality of other ships and their respective tracks. Even if their tracks intersect, they can be easily identified without confusion. Furthermore, since each mark has a different shape, it can be reliably distinguished even if the marks are of the same color, a single color CRT is sufficient, and the circuit of the device is simple and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an image of the display surface of a track display device such as a radar according to the present invention, FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a memory map of the memory shown in FIG. 2. FIG. 4 is a flowchart showing the operation of this embodiment, and FIG. 5 is a diagram showing an image on the display surface of a conventional track display device. 21: Mark position selection device, 22: Mark type selection switch, 24: CPU, 26: Character generator, 30-1...30-n: Memory.

Claims (1)

[Scope of Claims] 1. A character generator that generates a mark signal corresponding to at least one type of mark displayed in a predetermined shape on a display surface of a radar, etc., and a cursor means for selecting the position of an image of an observed object on the display surface. , operating means for assigning marks of different predetermined shapes to each object image on the display surface, and controlling the position of at least one image of the object on the display surface at predetermined time intervals by operating the cursor means and the operation means; a memory for storing positional data shown and a mark of a predetermined shape assigned to the image of the observed object; A track display device comprising: control means for erasing the oldest position data stored in the memory, and displaying a mark of the predetermined shape on a display surface of a radar or the like based on the position data in the memory. 2. A patent claim in which a character generator generates a mark signal based on position data at predetermined time intervals such that the mark corresponding to the latest position data is always large, and the marks corresponding to older position data are gradually smaller. The track display device according to item 1. 3. The control means selects a specific mark for each observed object only for the mark corresponding to the latest position data, and selects the same mark common to all observed objects for the mark corresponding to the older position data. The track display device according to claim 1, which selects the following.