JPH0484790A - Radar device to judge pseudo image due to multiple reflection - Google Patents

Abstract

PURPOSE:To eliminate pseudo image and the like by containing to memorize in a memory the sea area generating pseudo image due to an object existing on a particular sea area as a pseudo sea area, and judging the image data indicated on the pseudo sea area to be a pseudo image when it is a new object. CONSTITUTION:An operater always is to input and contain in a memory with the use of a pseudo sea area input means 10 by obtaining from the screen the pseudo sea area where pseudo image is generated due to multiple reflection by surrounding structures or anchoring ships. Then an image data input means 6 takes out image data contained in an image memory 4 for each direction and outputs them to a pseudo image judging means 7. The means 7 judges whether the input data is new object and read the new data position in the case of new object. It then judges whether the position is that of image data memorized in the pseudo sea area in memory 9. When judged to be in the position, it is judged to be a pseudo image due to multiple reflection. The position of the memorized image data judged to be a pseudo image is set in a pseudo image recognition and addition means 11, and the position is notified to the follower 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a radar device, and particularly to identification of false images due to multiple reflections.

[Prior art] In general, a false image is defined as the JIS shipbuilding term (navigation equipment radar) F0.
According to No. 036-1936, it is described as an unnecessary image appearing on the radar display screen due to radiation other than the main beam of the radar wave or due to multiple reflections of the radar wave by a target object. In this explanation, false images due to multiple reflections will be explained.

FIG. 5 is a diagram illustrating a false image caused by multiple reflections from a radar target.

In the figure, L is a radar station on land, T is an image of an actual target (hereinafter referred to as a ship) that is a primary reflector, K is an image of a structure that becomes a secondary reflector due to the ship T, and F is a false image. ,
R is distance.

The figure shows the positional relationship (distance) of the reflector (ship T1 structure K)
The positional relationship in which a false image occurs is determined, for example, if the distance between the ship T and the structure K is R, this explains why a false image appears behind the direction from which the ship T is viewed from the radar station. It is.

In other words, false images caused by multiple reflections of radar waves from targets are
Appears behind the direction of the real target.

In order to accurately determine a false image using this principle, for example, information from another fixed station is obtained, and an image behind the ship T is determined to be a false image.

[Problem to be solved by the invention E] In the conventional radar device as described above, although the principle of generating false images due to multiple reflections is known, The problem was that it required a lot of money to obtain video information to determine whether it was a fake image.

The present invention has been made to solve this problem, and even if a false image due to multiple reflections occurs, the present invention does not allow the fixed station to obtain an image from a fixed station installed at another location. The object of the present invention is to obtain a radar image display device that can determine that a false image is due to multiple reflections by simply looking at the image.

[Means for Solving the Problems] A radar device for determining false images due to multiple reflections according to the present invention converts reflected waves from a target object received via an antenna into video data, and performs tracking processing on the video data. In a radar device that later stores video data in the image memory corresponding to the position of the target object and displays it with a symbol mark, the sea area where a false image is generated by a target in a specific sea area is input as the false image area from the display unit. an input means for inputting information into a memory in which a plurality of false image areas are stored, and a false image due to multiple reflections if the image data of the target in the image memory is a new target and its position is within the false image area; false image determining means for determining that;
a false image processing means for adding a color or identification that can be determined as a false image of multiple reflection to the symbol mark of the video data determined to be a false image by the false image determining means, adding the symbol mark, or erasing the symbol mark; It is something that

[Operation] In the present invention, a plurality of sea areas in which a false image is generated due to a target in a specific sea area are stored in the memory as false image areas, and the image data of the target stored in the image memory is displayed as a new target. , and if the position is within the false image area stored in the memory, it will be determined that the false image is due to multiple reflections, and the symbol mark of the video data determined to be a false image will be marked with a color or color that can be determined to be a false image due to multiple reflections. Display by adding identification, adding a symbol mark, or erasing the symbol mark.

[Embodiment] FIG. 1 is a schematic configuration diagram of a radar device for determining false images due to multiple reflections, showing an embodiment of the present invention.

In the figure, (1) is the antenna, (2) is the antenna (1
) at a predetermined timing, the antenna (1)
This is a transmitting/receiving unit that converts the electrical signal of the reflected wave inputted from the video signal into a video signal (hereinafter referred to as video data) containing information such as direction and position, and outputs the video signal.

(3) is a tracking unit that reads the position of the target from the video data output from the transmitting/receiving unit (2), determines whether the position has a correlation with the past or previous position of video data, and determines if there is a correlation with the position of the past or previous video data. For example, after confirming that the video data has reached a preset number of times, it is tracked and output as past or previous video data, and the input video data is tracked and output as past or previous video data. If there is no correlation with the video data of , and a predetermined number of times is obtained, the target is output as a new target (no tracking flag is attached at first).

Furthermore, it tracks video data that is determined to be a false image by a false image determining means, which will be described later.

(4) is an image memory in which the image data of the target from the tracking unit (3) is stored for each direction, and is retrieved by the image data input means described later, and the image data that is considered to be a false image is identified as a false image. The image is output to the display unit (5) after being converted into the desired color.

Note that the video data stored in this image memory is obtained by cutting the signal strength at a predetermined level and corresponding to the area.

(6) is a video data input means, and image memory (4)
In addition to extracting the video data stored in the image data, its position is extracted for each direction.

(7) is a false image determination means, and video data input means (6
) is a new target and is located in the area where the false image occurs in the memory described later, it is determined to be a false image due to multiple reflections, and the position of the video data determined to be a false image is determined by the tracking unit (
3) is set in the false image identification color addition means described later.

(8) is a symbol mark creating means, which creates a symbol mark corresponding to the video data inputted from the video pig input means (6).

In this case, the course and speed of the target are determined by the tracking unit (3).
The symbol mark is obtained by adding a vector code corresponding to the course and speed to the symbol mark.

FIG. 2 is a diagram explaining the present invention in detail. In the figure, (a) shows the PP1 image, images T1 and T2 of one target on the land coastline L1 and images T and T.
The false images generated by 2 are F2 and F2, respectively.

(b) is a GD screen version of (a), and shows that after the image of the target object is made into a symbol mark, the image determined to be a false image is displayed in color (green).

For example, if the target at T2 shown in (a) is a ship anchored in the ocean area for a long time, then the target at T1 is the ship at the position shown in the figure (this position is the false image generation area). If the false images of F and F2 always occur in the area surrounded by the dotted line, the area surrounded by the dotted line is stored in advance as the false image sea area.

Then, when changing to the GD screen in (b), the image memory (
If the video data of 4) occurs as a new target in the false image area, the video is determined to be a false image and displayed in a color (green) that allows it to be determined as a false image. In other words, if a new target is displayed in the false image sea area, it means that the target has entered the false image generation area, and there is no need to judge whether there is a target in the false image generation area again.

FIG. 3 is a flowchart illustrating the invention in detail.

First, the tracking unit (3) executes position correlation processing on input video data (Pl).

Next, it is determined whether the video data can be obtained a predetermined number of times (F
2).

Next, a search is made to see if the video data that occurred a predetermined number of times occurred in a preset false image area (F3). Next, if the video data is not a false image sea area, it is determined that the target is a new target or a tracked target (F4).

Furthermore, if it is within the false image area, it is determined to be a false image (F4).

(9) is a memory in which a plurality of false image sea areas shown in (a) of FIG. 2 are stored, and a ROM or the like is used.

(lO) is a false image sea area input means for inputting a false image sea area, and the video data displayed on the display section (5) is, for example, a second
When reaching the area T2 in (a) of the figure, the false image area where a false image is generated due to multiple reflections due to surrounding structures or anchored ships is obtained from the screen and input into the memory (9). It is to be stored as follows.

(11) is a false image identification color addition means, and when the symbol mark created by the symbol mark creation means (8) is added, it is based on the position of the false image set by the false image determination means (7). The system adds a color (green) to the output symbol mark so that it can be identified as a false image.

(12) is a rewriting output control means (hereinafter referred to as output means), which writes the created symbol mark or the symbol mark that is considered to be a false image at the position where it was taken out, and after rewriting all the symbol marks to the display unit ( 5).

The operation of the radar device configured as described above for determining false images due to multiple reflections will be described below. In this case, since the operation of the tracking section (3) is well known, a description of the operation will be omitted and the invention will be emphasized.

FIG. 4 is a flowchart illustrating the present invention in detail.

As an initial setting, the operator always obtains the false image area where a false image occurs due to multiple reflections from surrounding structures or anchored ships from the screen, inputs it using the false image area input means (lO), and stores it in the memory (19). ) (SL).

For example, assume that the false image areas F and F2 that occur in the false image generation area of the ship image T2 in FIG. 2 are stored.

Next, the video data input means (6) takes out the video data stored in the image memory (4) for each direction and outputs it to the false image determination means (7) (S3).

Next, the false image determining means (7) determines whether the input video data is a new target (S5), and if it determines that it is a new target, reads the position of the video data (S7).

Then, it is searched to see if there is a position of the read video data in the false image area of the memory (9) (S9), and it is determined whether the position is stored in the memory (9) (Sll).

Next, if it is determined that there is a false image, it is determined that it is a false image due to multiple reflections (Sta).

Next, a program M is used to set the position of the read video data determined to be a false image in the false image identification color adding means (11).
ts). The tracking unit (3) is also informed of the position.

Then, the symbol mark creation means (8) generates a symbol mark corresponding to the video data (the course and speed are determined by the tracking unit (3)).
(obtained from) and outputs the created symbol mark to the false image identification color adding means (II) (S17)
.

Next, the false image identification color adding means (II) is activated by the false image determining means (7).
), if the symbol mark is at the set position,
A color (green) to be used as a false image is added to the input symbol mark and the result is outputted to the output means (13) (S19).

Next, the output means (13) writes a symbol mark at the position of the input symbol mark (S21).

Next, the video data input means (6) determines whether the position of video data in all directions has been retrieved (523), and if not retrieved, sets the video data in the next direction to be retrieved (825), and performs control. Move to step S3.

Further, if it is determined that the position of the video data in all directions has been extracted, the output means (13) outputs the symbol mark (including the symbol mark added with the false image color) of the image memory (4) to the display section (5). is output and displayed as shown in FIG. 2(b) (S27). Then, decide whether to finish (829)
, If it is not finished, set it to the starting direction531),
Control is transferred to step-83.

In the above embodiment, there is one image in each direction, but any number may be used, and although the false image is green, it may be of any color. Alternatively, an identification indicating a false image may be added.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of sea areas in which a false image is generated due to a target in a specific sea area are stored in the memory as false image sea areas, and video data displayed in the false image sea area is used as a new target area. If so, it is determined that it is a false image due to multiple reflections, so that it is possible to eliminate the color that can be easily identified as a false image or the false image.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a radar device for determining false images due to multiple reflections showing one embodiment of the present invention, Fig. 2 is a diagram explaining the present invention in detail, and Fig. 3 is a detailed diagram of the present invention. FIG. 4 is a flowchart for explaining the present invention in detail, and FIG. 5 is a diagram for explaining false images due to multiple reflections by radar targets. In the figure, (1) is the antenna, (2) is the transmitter/receiver, and (
3) is a tracking unit, (4) is an image memory, (6) is a video data input means, (7) is a false image determination means, (8) is a symbol mark creation means, (9) is a memory, and (10) is a A false image sea area input means, (11) a false image identification color addition means, and (12) an output means. Patent applicant: Oki Electric Industry Co., Ltd., agent: Satoshi Suzuki, patent attorney: Flowchart explaining the invention in detail Figure 3: Explanation of false images due to multiple reflections of radar waves from targets Whistle diagram: 1゜Display of incident Patent Application No. 197715 2゜Name of the Invention Radar device for determining false images due to multiple reflections 4゜Correction personRelationship with the caseAddressNameAddress of agent

Claims (1)

[Scope of Claims] The reflected wave from the target object received via the antenna is converted into video data, and after the video data is subjected to tracking processing, the video data is stored in an image memory in correspondence with the position of the target object. In the radar device that displays a symbol mark, an input means for inputting a sea area in which a false image is generated by a specific target as a false image sea area from the display section, and a plurality of the false image sea areas are stored by the input means. a memory for determining a false image due to multiple reflections if the image data of the target in the image memory is a new target and its position is within the false image area, and the false image determining means. A false image processing means that adds a color or identification that can be determined as a false image of multiple reflection to the symbol mark of the video data determined to be a false image, adds the symbol mark, or erases the symbol mark. A radar device that detects false images caused by multiple reflections.